IOUtils.java
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|---|---|---|
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org.apache.commons.io |
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Commons IO |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| DOC_COMMENT | Number of javadoc comment lines |  |
| COMMENTS | Comment lines | |
| DECL_COMMENTS | Comments in declarations | |
| SIZE | Size of the file in bytes | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| RETURNS | Number of return points from functions | |
| PARAMS | Number of formal parameter declarations | |
| LINES | Number of lines in the source file | |
| LINE_COMMENT | Number of line comments | |
| BLOCKS | Number of blocks | |
| FUNCTIONS | Number of function declarations | |
| CYCLOMATIC | Cyclomatic complexity | |
| OPERATORS | Number of operators | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| LOC | Lines of code | |
| PROGRAM_LENGTH | Halstead program length | |
| UNIQUE_OPERANDS | Number of unique operands | |
| ELOC | Effective lines of code | |
| JAVA0254 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| OPERANDS | Number of operands | |
| COMPARISONS | Number of comparison operators | |
| LOOPS | Number of loops | |
| EXITS | Procedure exits | |
| JAVA0160 | JAVA0160 Method does not throw specified exception | |
| LOGICAL_LINES | Number of statements | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| UNIQUE_OPERATORS | Number of unique operators | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.io;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.CharArrayWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.channels.Channel;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.commons.io.output.StringBuilderWriter;
/**
* General IO stream manipulation utilities.
* <p>
* This class provides static utility methods for input/output operations.
* <ul>
* <li>closeQuietly - these methods close a stream ignoring nulls and exceptions
* <li>toXxx/read - these methods read data from a stream
* <li>write - these methods write data to a stream
* <li>copy - these methods copy all the data from one stream to another
* <li>contentEquals - these methods compare the content of two streams
* </ul>
* <p>
* The byte-to-char methods and char-to-byte methods involve a conversion step.
* Two methods are provided in each case, one that uses the platform default
* encoding and the other which allows you to specify an encoding. You are
* encouraged to always specify an encoding because relying on the platform
* default can lead to unexpected results, for example when moving from
* development to production.
* <p>
* All the methods in this class that read a stream are buffered internally.
* This means that there is no cause to use a <code>BufferedInputStream</code>
* or <code>BufferedReader</code>. The default buffer size of 4K has been shown
* to be efficient in tests.
* <p>
* Wherever possible, the methods in this class do <em>not</em> flush or close
* the stream. This is to avoid making non-portable assumptions about the
* streams' origin and further use. Thus the caller is still responsible for
* closing streams after use.
* <p>
* Origin of code: Excalibur.
*
* @author Peter Donald
* @author Jeff Turner
* @author Matthew Hawthorne
* @author Stephen Colebourne
* @author Gareth Davis
* @author Ian Springer
* @author Niall Pemberton
* @author Sandy McArthur
* @version $Id: IOUtils.java 659817 2008-05-24 13:23:10Z niallp $
*/
public class IOUtils {
// NOTE: This class is focussed on InputStream, OutputStream, Reader and
// Writer. Each method should take at least one of these as a parameter,
// or return one of them.
/**
* The Unix directory separator character.
*/
public static final char DIR_SEPARATOR_UNIX = '/';
/**
* The Windows directory separator character.
*/
public static final char DIR_SEPARATOR_WINDOWS = '\\';
/**
* The system directory separator character.
*/
public static final char DIR_SEPARATOR = File.separatorChar;
/**
* The Unix line separator string.
*/
public static final String LINE_SEPARATOR_UNIX = "\n";
/**
* The Windows line separator string.
*/
public static final String LINE_SEPARATOR_WINDOWS = "\r\n";
/**
* The system line separator string.
*/
public static final String LINE_SEPARATOR;
static {
// avoid security issues
StringBuilderWriter buf = new StringBuilderWriter(4);
PrintWriter out = new PrintWriter(buf);
out.println();
LINE_SEPARATOR = buf.toString();
}
/**
* The default buffer size to use.
*/
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
/**
* Instances should NOT be constructed in standard programming.
*/
public IOUtils() {
super();
}
//-----------------------------------------------------------------------
/**
* Unconditionally close an <code>Reader</code>.
* <p>
* Equivalent to {@link Reader#close()}, except any exceptions will be ignored.
* This is typically used in finally blocks.
*
* @param input the Reader to close, may be null or already closed
*/
public static void closeQuietly(Reader input) {
try {
if (input != null) {
input.close();
}
} catch (IOException ioe) {
// ignore
}
}
/**
* Unconditionally close a <code>Channel</code>.
* <p>
* Equivalent to {@link Channel#close()}, except any exceptions will be ignored.
* This is typically used in finally blocks.
*
* @param channel the Channel to close, may be null or already closed
*/
public static void closeQuietly(Channel channel) {
try {
if (channel != null) {
channel.close();
}
} catch (IOException ioe) {
// ignore
}
}
/**
* Unconditionally close a <code>Writer</code>.
* <p>
* Equivalent to {@link Writer#close()}, except any exceptions will be ignored.
* This is typically used in finally blocks.
*
* @param output the Writer to close, may be null or already closed
*/
public static void closeQuietly(Writer output) {
try {
if (output != null) {
output.close();
}
} catch (IOException ioe) {
// ignore
}
}
/**
* Unconditionally close an <code>InputStream</code>.
* <p>
* Equivalent to {@link InputStream#close()}, except any exceptions will be ignored.
* This is typically used in finally blocks.
*
* @param input the InputStream to close, may be null or already closed
*/
public static void closeQuietly(InputStream input) {
try {
if (input != null) {
input.close();
}
} catch (IOException ioe) {
// ignore
}
}
/**
* Unconditionally close an <code>OutputStream</code>.
* <p>
* Equivalent to {@link OutputStream#close()}, except any exceptions will be ignored.
* This is typically used in finally blocks.
*
* @param output the OutputStream to close, may be null or already closed
*/
public static void closeQuietly(OutputStream output) {
try {
if (output != null) {
output.close();
}
} catch (IOException ioe) {
// ignore
}
}
// read toByteArray
//-----------------------------------------------------------------------
/**
* Get the contents of an <code>InputStream</code> as a <code>byte[]</code>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from
* @return the requested byte array
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
*/
public static byte[] toByteArray(InputStream input) throws IOException {
ByteArrayOutputStream output = new ByteArrayOutputStream();
copy(input, output);
return output.toByteArray();
}
/**
* Get the contents of a <code>Reader</code> as a <code>byte[]</code>
* using the default character encoding of the platform.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from
* @return the requested byte array
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
*/
public static byte[] toByteArray(Reader input) throws IOException {
ByteArrayOutputStream output = new ByteArrayOutputStream();
copy(input, output);
return output.toByteArray();
}
/**
* Get the contents of a <code>Reader</code> as a <code>byte[]</code>
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from
* @param encoding the encoding to use, null means platform default
* @return the requested byte array
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static byte[] toByteArray(Reader input, String encoding)
throws IOException {
ByteArrayOutputStream output = new ByteArrayOutputStream();
copy(input, output, encoding);
return output.toByteArray();
}
/**
* Get the contents of a <code>String</code> as a <code>byte[]</code>
* using the default character encoding of the platform.
* <p>
* This is the same as {@link String#getBytes()}.
*
* @param input the <code>String</code> to convert
* @return the requested byte array
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs (never occurs)
* @deprecated Use {@link String#getBytes()}
*/
@Deprecated
public static byte[] toByteArray(String input) throws IOException {
return input.getBytes();
}
// read char[]
//-----------------------------------------------------------------------
/**
* Get the contents of an <code>InputStream</code> as a character array
* using the default character encoding of the platform.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param is the <code>InputStream</code> to read from
* @return the requested character array
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static char[] toCharArray(InputStream is) throws IOException {
CharArrayWriter output = new CharArrayWriter();
copy(is, output);
return output.toCharArray();
}
/**
* Get the contents of an <code>InputStream</code> as a character array
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param is the <code>InputStream</code> to read from
* @param encoding the encoding to use, null means platform default
* @return the requested character array
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static char[] toCharArray(InputStream is, String encoding)
throws IOException {
CharArrayWriter output = new CharArrayWriter();
copy(is, output, encoding);
return output.toCharArray();
}
/**
* Get the contents of a <code>Reader</code> as a character array.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from
* @return the requested character array
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static char[] toCharArray(Reader input) throws IOException {
CharArrayWriter sw = new CharArrayWriter();
copy(input, sw);
return sw.toCharArray();
}
// read toString
//-----------------------------------------------------------------------
/**
* Get the contents of an <code>InputStream</code> as a String
* using the default character encoding of the platform.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from
* @return the requested String
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
*/
public static String toString(InputStream input) throws IOException {
StringBuilderWriter sw = new StringBuilderWriter();
copy(input, sw);
return sw.toString();
}
/**
* Get the contents of an <code>InputStream</code> as a String
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from
* @param encoding the encoding to use, null means platform default
* @return the requested String
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
*/
public static String toString(InputStream input, String encoding)
throws IOException {
StringBuilderWriter sw = new StringBuilderWriter();
copy(input, sw, encoding);
return sw.toString();
}
/**
* Get the contents of a <code>Reader</code> as a String.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from
* @return the requested String
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
*/
public static String toString(Reader input) throws IOException {
StringBuilderWriter sw = new StringBuilderWriter();
copy(input, sw);
return sw.toString();
}
/**
* Get the contents of a <code>byte[]</code> as a String
* using the default character encoding of the platform.
*
* @param input the byte array to read from
* @return the requested String
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs (never occurs)
* @deprecated Use {@link String#String(byte[])}
*/
@Deprecated
public static String toString(byte[] input) throws IOException {
return new String(input);
}
/**
* Get the contents of a <code>byte[]</code> as a String
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
*
* @param input the byte array to read from
* @param encoding the encoding to use, null means platform default
* @return the requested String
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs (never occurs)
* @deprecated Use {@link String#String(byte[],String)}
*/
@Deprecated
public static String toString(byte[] input, String encoding)
throws IOException {
if (encoding == null) {
return new String(input);
} else {
return new String(input, encoding);
}
}
// readLines
//-----------------------------------------------------------------------
/**
* Get the contents of an <code>InputStream</code> as a list of Strings,
* one entry per line, using the default character encoding of the platform.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from, not null
* @return the list of Strings, never null
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static List<String> readLines(InputStream input) throws IOException {
InputStreamReader reader = new InputStreamReader(input);
return readLines(reader);
}
/**
* Get the contents of an <code>InputStream</code> as a list of Strings,
* one entry per line, using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from, not null
* @param encoding the encoding to use, null means platform default
* @return the list of Strings, never null
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static List<String> readLines(InputStream input, String encoding) throws IOException {
if (encoding == null) {
return readLines(input);
} else {
InputStreamReader reader = new InputStreamReader(input, encoding);
return readLines(reader);
}
}
/**
* Get the contents of a <code>Reader</code> as a list of Strings,
* one entry per line.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from, not null
* @return the list of Strings, never null
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static List<String> readLines(Reader input) throws IOException {
BufferedReader reader = new BufferedReader(input);
List<String> list = new ArrayList<String>();
String line = reader.readLine();
while (line != null) {
list.add(line);
line = reader.readLine();
}
return list;
}
// lineIterator
//-----------------------------------------------------------------------
/**
* Return an Iterator for the lines in a <code>Reader</code>.
* <p>
* <code>LineIterator</code> holds a reference to the open
* <code>Reader</code> specified here. When you have finished with the
* iterator you should close the reader to free internal resources.
* This can be done by closing the reader directly, or by calling
* {@link LineIterator#close()} or {@link LineIterator#closeQuietly(LineIterator)}.
* <p>
* The recommended usage pattern is:
* <pre>
* try {
* LineIterator it = IOUtils.lineIterator(reader);
* while (it.hasNext()) {
* String line = it.nextLine();
* /// do something with line
* }
* } finally {
* IOUtils.closeQuietly(reader);
* }
* </pre>
*
* @param reader the <code>Reader</code> to read from, not null
* @return an Iterator of the lines in the reader, never null
* @throws IllegalArgumentException if the reader is null
* @since Commons IO 1.2
*/
public static LineIterator lineIterator(Reader reader) {
return new LineIterator(reader);
}
/**
* Return an Iterator for the lines in an <code>InputStream</code>, using
* the character encoding specified (or default encoding if null).
* <p>
* <code>LineIterator</code> holds a reference to the open
* <code>InputStream</code> specified here. When you have finished with
* the iterator you should close the stream to free internal resources.
* This can be done by closing the stream directly, or by calling
* {@link LineIterator#close()} or {@link LineIterator#closeQuietly(LineIterator)}.
* <p>
* The recommended usage pattern is:
* <pre>
* try {
* LineIterator it = IOUtils.lineIterator(stream, "UTF-8");
* while (it.hasNext()) {
* String line = it.nextLine();
* /// do something with line
* }
* } finally {
* IOUtils.closeQuietly(stream);
* }
* </pre>
*
* @param input the <code>InputStream</code> to read from, not null
* @param encoding the encoding to use, null means platform default
* @return an Iterator of the lines in the reader, never null
* @throws IllegalArgumentException if the input is null
* @throws IOException if an I/O error occurs, such as if the encoding is invalid
* @since Commons IO 1.2
*/
public static LineIterator lineIterator(InputStream input, String encoding)
throws IOException {
Reader reader = null;
if (encoding == null) {
reader = new InputStreamReader(input);
} else {
reader = new InputStreamReader(input, encoding);
}
return new LineIterator(reader);
}
//-----------------------------------------------------------------------
/**
* Convert the specified CharSequence to an input stream, encoded as bytes
* using the default character encoding of the platform.
*
* @param input the CharSequence to convert
* @return an input stream
* @since IO 2.0
*/
public static InputStream toInputStream(CharSequence input) {
return toInputStream(input.toString());
}
/**
* Convert the specified CharSequence to an input stream, encoded as bytes
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
*
* @param input the CharSequence to convert
* @param encoding the encoding to use, null means platform default
* @throws IOException if the encoding is invalid
* @return an input stream
* @since IO 2.0
*/
public static InputStream toInputStream(CharSequence input, String encoding) throws IOException {
return toInputStream(input.toString(), encoding);
}
//-----------------------------------------------------------------------
/**
* Convert the specified string to an input stream, encoded as bytes
* using the default character encoding of the platform.
*
* @param input the string to convert
* @return an input stream
* @since Commons IO 1.1
*/
public static InputStream toInputStream(String input) {
byte[] bytes = input.getBytes();
return new ByteArrayInputStream(bytes);
}
/**
* Convert the specified string to an input stream, encoded as bytes
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
*
* @param input the string to convert
* @param encoding the encoding to use, null means platform default
* @throws IOException if the encoding is invalid
* @return an input stream
* @since Commons IO 1.1
*/
public static InputStream toInputStream(String input, String encoding) throws IOException {
byte[] bytes = encoding != null ? input.getBytes(encoding) : input.getBytes();
return new ByteArrayInputStream(bytes);
}
// write byte[]
//-----------------------------------------------------------------------
/**
* Writes bytes from a <code>byte[]</code> to an <code>OutputStream</code>.
*
* @param data the byte array to write, do not modify during output,
* null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(byte[] data, OutputStream output)
throws IOException {
if (data != null) {
output.write(data);
}
}
/**
* Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code>
* using the default character encoding of the platform.
* <p>
* This method uses {@link String#String(byte[])}.
*
* @param data the byte array to write, do not modify during output,
* null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(byte[] data, Writer output) throws IOException {
if (data != null) {
output.write(new String(data));
}
}
/**
* Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code>
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#String(byte[], String)}.
*
* @param data the byte array to write, do not modify during output,
* null ignored
* @param output the <code>Writer</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(byte[] data, Writer output, String encoding)
throws IOException {
if (data != null) {
if (encoding == null) {
write(data, output);
} else {
output.write(new String(data, encoding));
}
}
}
// write char[]
//-----------------------------------------------------------------------
/**
* Writes chars from a <code>char[]</code> to a <code>Writer</code>
* using the default character encoding of the platform.
*
* @param data the char array to write, do not modify during output,
* null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(char[] data, Writer output) throws IOException {
if (data != null) {
output.write(data);
}
}
/**
* Writes chars from a <code>char[]</code> to bytes on an
* <code>OutputStream</code>.
* <p>
* This method uses {@link String#String(char[])} and
* {@link String#getBytes()}.
*
* @param data the char array to write, do not modify during output,
* null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(char[] data, OutputStream output)
throws IOException {
if (data != null) {
output.write(new String(data).getBytes());
}
}
/**
* Writes chars from a <code>char[]</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#String(char[])} and
* {@link String#getBytes(String)}.
*
* @param data the char array to write, do not modify during output,
* null ignored
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(char[] data, OutputStream output, String encoding)
throws IOException {
if (data != null) {
if (encoding == null) {
write(data, output);
} else {
output.write(new String(data).getBytes(encoding));
}
}
}
// write CharSequence
//-----------------------------------------------------------------------
/**
* Writes chars from a <code>CharSequence</code> to a <code>Writer</code>.
*
* @param data the <code>CharSequence</code> to write, null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 2.0
*/
public static void write(CharSequence data, Writer output) throws IOException {
if (data != null) {
write(data.toString(), output);
}
}
/**
* Writes chars from a <code>CharSequence</code> to bytes on an
* <code>OutputStream</code> using the default character encoding of the
* platform.
* <p>
* This method uses {@link String#getBytes()}.
*
* @param data the <code>CharSequence</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 2.0
*/
public static void write(CharSequence data, OutputStream output)
throws IOException {
if (data != null) {
write(data.toString(), output);
}
}
/**
* Writes chars from a <code>CharSequence</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#getBytes(String)}.
*
* @param data the <code>CharSequence</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 2.0
*/
public static void write(CharSequence data, OutputStream output, String encoding)
throws IOException {
if (data != null) {
write(data.toString(), output, encoding);
}
}
// write String
//-----------------------------------------------------------------------
/**
* Writes chars from a <code>String</code> to a <code>Writer</code>.
*
* @param data the <code>String</code> to write, null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(String data, Writer output) throws IOException {
if (data != null) {
output.write(data);
}
}
/**
* Writes chars from a <code>String</code> to bytes on an
* <code>OutputStream</code> using the default character encoding of the
* platform.
* <p>
* This method uses {@link String#getBytes()}.
*
* @param data the <code>String</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(String data, OutputStream output)
throws IOException {
if (data != null) {
output.write(data.getBytes());
}
}
/**
* Writes chars from a <code>String</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#getBytes(String)}.
*
* @param data the <code>String</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(String data, OutputStream output, String encoding)
throws IOException {
if (data != null) {
if (encoding == null) {
write(data, output);
} else {
output.write(data.getBytes(encoding));
}
}
}
// write StringBuffer
//-----------------------------------------------------------------------
/**
* Writes chars from a <code>StringBuffer</code> to a <code>Writer</code>.
*
* @param data the <code>StringBuffer</code> to write, null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
* @deprecated replaced by write(CharSequence, Writer)
*/
@Deprecated
public static void write(StringBuffer data, Writer output)
throws IOException {
if (data != null) {
output.write(data.toString());
}
}
/**
* Writes chars from a <code>StringBuffer</code> to bytes on an
* <code>OutputStream</code> using the default character encoding of the
* platform.
* <p>
* This method uses {@link String#getBytes()}.
*
* @param data the <code>StringBuffer</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
* @deprecated replaced by write(CharSequence, OutputStream)
*/
@Deprecated
public static void write(StringBuffer data, OutputStream output)
throws IOException {
if (data != null) {
output.write(data.toString().getBytes());
}
}
/**
* Writes chars from a <code>StringBuffer</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#getBytes(String)}.
*
* @param data the <code>StringBuffer</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
* @deprecated replaced by write(CharSequence, OutputStream, String)
*/
@Deprecated
public static void write(StringBuffer data, OutputStream output,
String encoding) throws IOException {
if (data != null) {
if (encoding == null) {
write(data, output);
} else {
output.write(data.toString().getBytes(encoding));
}
}
}
// writeLines
//-----------------------------------------------------------------------
/**
* Writes the <code>toString()</code> value of each item in a collection to
* an <code>OutputStream</code> line by line, using the default character
* encoding of the platform and the specified line ending.
*
* @param lines the lines to write, null entries produce blank lines
* @param lineEnding the line separator to use, null is system default
* @param output the <code>OutputStream</code> to write to, not null, not closed
* @throws NullPointerException if the output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void writeLines(Collection<?> lines, String lineEnding,
OutputStream output) throws IOException {
if (lines == null) {
return;
}
if (lineEnding == null) {
lineEnding = LINE_SEPARATOR;
}
for (Iterator<?> it = lines.iterator(); it.hasNext(); ) {
Object line = it.next();
if (line != null) {
output.write(line.toString().getBytes());
}
output.write(lineEnding.getBytes());
}
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* an <code>OutputStream</code> line by line, using the specified character
* encoding and the specified line ending.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
*
* @param lines the lines to write, null entries produce blank lines
* @param lineEnding the line separator to use, null is system default
* @param output the <code>OutputStream</code> to write to, not null, not closed
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if the output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void writeLines(Collection<?> lines, String lineEnding,
OutputStream output, String encoding) throws IOException {
if (encoding == null) {
writeLines(lines, lineEnding, output);
} else {
if (lines == null) {
return;
}
if (lineEnding == null) {
lineEnding = LINE_SEPARATOR;
}
for (Iterator<?> it = lines.iterator(); it.hasNext(); ) {
Object line = it.next();
if (line != null) {
output.write(line.toString().getBytes(encoding));
}
output.write(lineEnding.getBytes(encoding));
}
}
}
/**
* Writes the <code>toString()</code> value of each item in a collection to
* a <code>Writer</code> line by line, using the specified line ending.
*
* @param lines the lines to write, null entries produce blank lines
* @param lineEnding the line separator to use, null is system default
* @param writer the <code>Writer</code> to write to, not null, not closed
* @throws NullPointerException if the input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void writeLines(Collection<?> lines, String lineEnding,
Writer writer) throws IOException {
if (lines == null) {
return;
}
if (lineEnding == null) {
lineEnding = LINE_SEPARATOR;
}
for (Iterator<?> it = lines.iterator(); it.hasNext(); ) {
Object line = it.next();
if (line != null) {
writer.write(line.toString());
}
writer.write(lineEnding);
}
}
// copy from InputStream
//-----------------------------------------------------------------------
/**
* Copy bytes from an <code>InputStream</code> to an
* <code>OutputStream</code>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
* <p>
* Large streams (over 2GB) will return a bytes copied value of
* <code>-1</code> after the copy has completed since the correct
* number of bytes cannot be returned as an int. For large streams
* use the <code>copyLarge(InputStream, OutputStream)</code> method.
*
* @param input the <code>InputStream</code> to read from
* @param output the <code>OutputStream</code> to write to
* @return the number of bytes copied
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @throws ArithmeticException if the byte count is too large
* @since Commons IO 1.1
*/
public static int copy(InputStream input, OutputStream output) throws IOException {
long count = copyLarge(input, output);
if (count > Integer.MAX_VALUE) {
return -1;
}
return (int) count;
}
/**
* Copy bytes from a large (over 2GB) <code>InputStream</code> to an
* <code>OutputStream</code>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from
* @param output the <code>OutputStream</code> to write to
* @return the number of bytes copied
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.3
*/
public static long copyLarge(InputStream input, OutputStream output)
throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
/**
* Copy bytes from an <code>InputStream</code> to chars on a
* <code>Writer</code> using the default character encoding of the platform.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
* <p>
* This method uses {@link InputStreamReader}.
*
* @param input the <code>InputStream</code> to read from
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void copy(InputStream input, Writer output)
throws IOException {
InputStreamReader in = new InputStreamReader(input);
copy(in, output);
}
/**
* Copy bytes from an <code>InputStream</code> to chars on a
* <code>Writer</code> using the specified character encoding.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link InputStreamReader}.
*
* @param input the <code>InputStream</code> to read from
* @param output the <code>Writer</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void copy(InputStream input, Writer output, String encoding)
throws IOException {
if (encoding == null) {
copy(input, output);
} else {
InputStreamReader in = new InputStreamReader(input, encoding);
copy(in, output);
}
}
// copy from Reader
//-----------------------------------------------------------------------
/**
* Copy chars from a <code>Reader</code> to a <code>Writer</code>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
* <p>
* Large streams (over 2GB) will return a chars copied value of
* <code>-1</code> after the copy has completed since the correct
* number of chars cannot be returned as an int. For large streams
* use the <code>copyLarge(Reader, Writer)</code> method.
*
* @param input the <code>Reader</code> to read from
* @param output the <code>Writer</code> to write to
* @return the number of characters copied
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @throws ArithmeticException if the character count is too large
* @since Commons IO 1.1
*/
public static int copy(Reader input, Writer output) throws IOException {
long count = copyLarge(input, output);
if (count > Integer.MAX_VALUE) {
return -1;
}
return (int) count;
}
/**
* Copy chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from
* @param output the <code>Writer</code> to write to
* @return the number of characters copied
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.3
*/
public static long copyLarge(Reader input, Writer output) throws IOException {
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
/**
* Copy chars from a <code>Reader</code> to bytes on an
* <code>OutputStream</code> using the default character encoding of the
* platform, and calling flush.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
* <p>
* Due to the implementation of OutputStreamWriter, this method performs a
* flush.
* <p>
* This method uses {@link OutputStreamWriter}.
*
* @param input the <code>Reader</code> to read from
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void copy(Reader input, OutputStream output)
throws IOException {
OutputStreamWriter out = new OutputStreamWriter(output);
copy(input, out);
// XXX Unless anyone is planning on rewriting OutputStreamWriter, we
// have to flush here.
out.flush();
}
/**
* Copy chars from a <code>Reader</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding, and
* calling flush.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* Due to the implementation of OutputStreamWriter, this method performs a
* flush.
* <p>
* This method uses {@link OutputStreamWriter}.
*
* @param input the <code>Reader</code> to read from
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if the input or output is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void copy(Reader input, OutputStream output, String encoding)
throws IOException {
if (encoding == null) {
copy(input, output);
} else {
OutputStreamWriter out = new OutputStreamWriter(output, encoding);
copy(input, out);
// XXX Unless anyone is planning on rewriting OutputStreamWriter,
// we have to flush here.
out.flush();
}
}
// content equals
//-----------------------------------------------------------------------
/**
* Compare the contents of two Streams to determine if they are equal or
* not.
* <p>
* This method buffers the input internally using
* <code>BufferedInputStream</code> if they are not already buffered.
*
* @param input1 the first stream
* @param input2 the second stream
* @return true if the content of the streams are equal or they both don't
* exist, false otherwise
* @throws NullPointerException if either input is null
* @throws IOException if an I/O error occurs
*/
public static boolean contentEquals(InputStream input1, InputStream input2)
throws IOException {
if (!(input1 instanceof BufferedInputStream)) {
input1 = new BufferedInputStream(input1);
}
if (!(input2 instanceof BufferedInputStream)) {
input2 = new BufferedInputStream(input2);
}
int ch = input1.read();
while (-1 != ch) {
int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
int ch2 = input2.read();
return (ch2 == -1);
}
/**
* Compare the contents of two Readers to determine if they are equal or
* not.
* <p>
* This method buffers the input internally using
* <code>BufferedReader</code> if they are not already buffered.
*
* @param input1 the first reader
* @param input2 the second reader
* @return true if the content of the readers are equal or they both don't
* exist, false otherwise
* @throws NullPointerException if either input is null
* @throws IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static boolean contentEquals(Reader input1, Reader input2)
throws IOException {
if (!(input1 instanceof BufferedReader)) {
input1 = new BufferedReader(input1);
}
if (!(input2 instanceof BufferedReader)) {
input2 = new BufferedReader(input2);
}
int ch = input1.read();
while (-1 != ch) {
int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
int ch2 = input2.read();
return (ch2 == -1);
}
}
The table below shows all metrics for IOUtils.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 131.00 | Number of blocks | |
| BLOCK_COMMENT | 16.00 | Number of block comment lines | |
| COMMENTS | 874.00 | Comment lines | |
| COMMENT_DENSITY | 2.60 | Comment density | |
| COMPARISONS | 56.00 | Number of comparison operators | |
| CYCLOMATIC | 116.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 82.00 | Comments in declarations | |
| DOC_COMMENT | 814.00 | Number of javadoc comment lines | |
| ELOC | 336.00 | Effective lines of code | |
| EXEC_COMMENTS | 8.00 | Comments in executable code | |
| EXITS | 54.00 | Procedure exits | |
| FUNCTIONS | 55.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 73.91 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 234.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 0.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 0.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 1.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 0.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 1.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 1.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 0.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 0.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 0.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 0.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 0.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 0.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 0.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 0.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 0.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 1.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 0.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 0.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 2.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 0.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 0.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 3.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 1.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 1392.00 | Number of lines in the source file | |
| LINE_COMMENT | 44.00 | Number of line comments | |
| LOC | 453.00 | Lines of code | |
| LOGICAL_LINES | 178.00 | Number of statements | |
| LOOPS | 8.00 | Number of loops | |
| NEST_DEPTH | 4.00 | Maximum nesting depth | |
| OPERANDS | 931.00 | Number of operands | |
| OPERATORS | 1900.00 | Number of operators | |
| PARAMS | 101.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 2831.00 | Halstead program length | |
| PROGRAM_VOCAB | 343.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 133.00 | Number of return points from functions | |
| SIZE | 51797.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 296.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 47.00 | Number of unique operators | |
| WHITESPACE | 65.00 | Number of whitespace lines | |