ClassHolder.java
| Index Score | ||
|---|---|---|
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org.apache.derby.iapi.services.classfile |
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Apache Derby |
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 | |
|---|---|---|
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' |  |
| DECL_COMMENTS | Comments in declarations | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| RETURNS | Number of return points from functions | |
| PARAMS | Number of formal parameter declarations | |
| BLOCK_COMMENT | Number of block comment lines | |
| CYCLOMATIC | Cyclomatic complexity | |
| COMMENTS | Comment lines | |
| LINES | Number of lines in the source file | |
| FUNCTIONS | Number of function declarations | |
| SIZE | Size of the file in bytes | |
| JAVA0285 | JAVA0285 Dereference of potentially null variable | |
| EXITS | Procedure exits | |
| BLOCKS | Number of blocks | |
| UNIQUE_OPERANDS | Number of unique operands | |
| LOGICAL_LINES | Number of statements | |
| OPERANDS | Number of operands | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| PROGRAM_LENGTH | Halstead program length | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| OPERATORS | Number of operators | |
| WHITESPACE | Number of whitespace lines | |
| ELOC | Effective lines of code | |
| LOC | Lines of code | |
| COMPARISONS | Number of comparison operators | |
| JAVA0177 | JAVA0177 Variable declaration missing initializer | |
| JAVA0035 | JAVA0035 Missing braces in for statement | |
| JAVA0106 | JAVA0106 Unnecessary import from current package | |
| EXEC_COMMENTS | Comments in executable code | |
| UNIQUE_OPERATORS | Number of unique operators | |
| LINE_COMMENT | Number of line comments | |
| JAVA0068 | JAVA0068 Modifiers not declared in recommended order | |
| DOC_COMMENT | Number of javadoc comment lines | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0032 | JAVA0032 Switch statement missing default | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0123 | JAVA0123 Use all three components of for loop | |
| JAVA0029 | JAVA0029 Private method not used | |
| JAVA0100 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| NEST_DEPTH | Maximum nesting depth | |
/*
Derby - Class org.apache.derby.iapi.services.classfile.ClassHolder
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.derby.iapi.services.classfile;
import org.apache.derby.iapi.services.sanity.SanityManager;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.io.IOException;
import java.util.Vector;
import org.apache.derby.iapi.util.ByteArray;
import org.apache.derby.iapi.services.classfile.VMDescriptor;
import org.apache.derby.iapi.services.classfile.VMDescriptor;
import java.util.Hashtable;
import java.util.Vector;
import java.util.Enumeration;
/** Based upon "THE class FILE FORMAT" chapter of "The Java Virtual Machine Specification"
corresponding to version 1.0.2 of the Java Virtual Machine and 1.0.2 of the
Java Language Specification.
ISBN 0-201-63452-X, September 1996.
*/
public class ClassHolder {
/*
** Constants.
*/
/*
** Fields
*/
/**
* Minor class format number defaults to
* VMDescriptor.JAVA_CLASS_FORMAT_MINOR_VERSION
* which currently corresponds to a really old (JDK 1.0.2) setting.
* The default major and minor value is used by the generated code for Derby's
* SQL statements. Currently there is no need to bump the version
* number as the generated code does not take advantage of any of the
* new elements in the class file format. If such a need exists then
* this can be bumped. One issue is that the change in format numbers
* is not well documented.
*/
protected int minor_version = VMDescriptor.JAVA_CLASS_FORMAT_MINOR_VERSION;
/**
* Minor class format number defaults to
* VMDescriptor.JAVA_CLASS_FORMAT_MAJOR_VERSION
*/
protected int major_version = VMDescriptor.JAVA_CLASS_FORMAT_MAJOR_VERSION;
protected int access_flags;
protected int this_class;
protected int super_class;
// protected InterfacesArray interfaces; // can be null
protected int[] interfaces; //can be null
protected MemberTable field_info; // can be null
protected MemberTable method_info; // can be null
protected Attributes attribute_info; // can be null
/*
** Fields for Constant Pool Table
*/
protected Hashtable cptHashTable;
protected Vector cptEntries;
private int cptEstimatedSize;
/**
Used to search for index entries to avoid object allocation
in the case a referecne already exists.
*/
private final CONSTANT_Index_info searchIndex = new CONSTANT_Index_info(0, 0, 0);
/*
** Constructors.
*/
protected ClassHolder(int estimatedConstantPoolCount) {
// Constant Pool Information
// 100 is the estimate of the number of entries that will be generated
cptEntries = new Vector(estimatedConstantPoolCount);
cptHashTable = new Hashtable(estimatedConstantPoolCount, (float)0.75);
// reserve the 0'th constant pool entry
cptEntries.setSize(1);
}
/**
This will not define a constructor -- it is up
to the caller to add at least one.
*/
public ClassHolder(String fullyQualifiedName, String superClassName,
int modifiers) {
this(100);
access_flags = modifiers | /* Modifier.SUPER */ 0x0020;
this_class = addClassReference(fullyQualifiedName);
super_class = addClassReference(superClassName);
method_info = new MemberTable(0);
}
private void put(ClassFormatOutput out) throws IOException {
/* Write out the header */
out.putU4(VMDescriptor.JAVA_CLASS_FORMAT_MAGIC);
out.putU2(minor_version);
out.putU2(major_version);
// special case checking that the number of constant
// pool entries does not exceed the limit of 65535
// (as it is stored as a U2).
// Special case to allow somewhat easier debugging
// of the resulting failure.
out.putU2("constant_pool", cptEntries.size());
cptPut(out);
out.putU2(access_flags);
out.putU2(this_class);
out.putU2(super_class);
if (interfaces != null) {
int ilen = interfaces.length;
out.putU2(ilen);
for (int i = 0; i < ilen; i++) {
out.putU2(interfaces[i]);
}
} else {
out.putU2(0);
}
if (field_info != null) {
out.putU2(field_info.size());
field_info.put(out);
} else {
out.putU2(0);
}
if (method_info != null) {
out.putU2(method_info.size());
method_info.put(out);
} else {
out.putU2(0);
}
if (attribute_info != null) {
out.putU2(attribute_info.size());
attribute_info.put(out);
} else {
out.putU2(0);
}
}
/*
** Public methods from ClassHolder.
*/
/**
* Convert the object representation of the class into
* its class file format.
* @exception IOException error writing the class
*/
public ByteArray getFileFormat() throws IOException {
int classFileSize = 4 + (10 * 2);
classFileSize += cptEstimatedSize;
if (interfaces != null)
classFileSize += (interfaces.length * 2);
if (field_info != null)
classFileSize += field_info.classFileSize();
if (method_info != null)
classFileSize += method_info.classFileSize();
if (attribute_info != null)
classFileSize += attribute_info.classFileSize();
ClassFormatOutput cfo = new ClassFormatOutput(classFileSize + 200);
put(cfo);
return new ByteArray(cfo.getData(), 0, cfo.size());
}
/*
** Public methods from ClassMember
*/
/** @see ClassMember
*/
public int getModifier() { return access_flags; }
/** @see ClassMember
*/
public String getName() {
return className(this_class).replace('/', '.');
}
/*
** Public methods from ClassHolder
*/
/** @see ClassHolder#addMember */
public ClassMember addMember(String simpleName, String descriptor, int modifier)
{
if (SanityManager.DEBUG)
{
if (descriptor.startsWith("(")) {
if (method_info != null) {
if (method_info.find(simpleName, descriptor) != null) {
SanityManager.THROWASSERT("Method already exists " + simpleName + " " + descriptor);
}
}
} else {
if (field_info != null) {
if (field_info.find(simpleName, descriptor) != null) {
SanityManager.THROWASSERT("Field already exists " + simpleName + " " + descriptor);
}
}
}
}
CONSTANT_Utf8_info utf = addUtf8Entry(simpleName);
int nameIndex = utf.getIndex();
int descriptorIndex = addUtf8Entry(descriptor).getIndex();
ClassMember item = new ClassMember(this, modifier, nameIndex, descriptorIndex);
MemberTable mt;
if (descriptor.startsWith("(")) {
mt = method_info;
if (mt == null)
mt = method_info = new MemberTable(0);
}
else {
mt = field_info;
if (mt == null)
mt = field_info = new MemberTable(0);
}
mt.addEntry(item);
return item;
}
/** @see ClassHolder#addFieldReference */
public int addFieldReference(String className, String simpleName, String descriptor) {
return addReference(VMDescriptor.CONSTANT_Fieldref, className, simpleName, descriptor);
}
public int addFieldReference(ClassMember field) {
return addReference(VMDescriptor.CONSTANT_Fieldref, (ClassMember) field);
}
/** @see ClassHolder#addMethodReference */
public int addMethodReference(String className, String simpleName, String descriptor, boolean isInterface) {
int tag = isInterface ? VMDescriptor.CONSTANT_InterfaceMethodref :
VMDescriptor.CONSTANT_Methodref;
return addReference(tag, className, simpleName, descriptor);
}
private int addReference(int tag, String className, String simpleName, String descriptor) {
int classIndex = addClassReference(className);
int nameTypeIndex = addNameAndType(simpleName, descriptor);
return addIndexReference(tag, classIndex, nameTypeIndex);
}
private int addReference(int tag, ClassMember member) {
int nameTypeIndex = addIndexReference(VMDescriptor.CONSTANT_NameAndType,
member.name_index, member.descriptor_index);
return addIndexReference(tag, this_class, nameTypeIndex);
}
/** @see ClassHolder#addConstant */
public int addConstant(String value) {
return addString(value);
}
/** @see ClassHolder#addUtf8 */
public int addUtf8(String value) {
return addUtf8Entry(value).getIndex();
}
/** @see ClassHolder#addConstant */
public int addConstant(int value) {
return addDirectEntry(new CONSTANT_Integer_info(value));
}
/** @see ClassHolder#addConstant */
public int addConstant(float value) {
return addDirectEntry(new CONSTANT_Float_info(value));
}
/** @see ClassHolder#addConstant */
public int addConstant(long value) {
return addDirectEntry(new CONSTANT_Long_info(value));
}
/** @see ClassHolder#addConstant */
public int addConstant(double value) {
return addDirectEntry(new CONSTANT_Double_info(value));
}
/** @see ClassMember
*/
public int getConstantPoolIndex() { return this_class; }
public void addAttribute(String attributeName, ClassFormatOutput info) {
if (attribute_info == null)
attribute_info = new Attributes(1);
CONSTANT_Utf8_info autf = addUtf8Entry(attributeName);
int index = autf.getIndex();
attribute_info.addEntry(new AttributeEntry(index, info));
}
public String getSuperClassName() {
if (super_class == 0)
return null;
else
return className(super_class).replace('/', '.');
}
/*
public ClassMember getMemberReference(String fullyQualifiedClassName, String simpleName, String descriptor) {
int classIndex;
if (fullyQualifiedClassName == null)
classIndex = this_class;
else
classIndex = constantPool.findClass(fullyQualifiedClassName);
if (classIndex < 0)
return null;
int nameAndTypeIndex = constantPool.findNameAndType(simpleName, descriptor);
if (nameAndTypeIndex < 0)
return null;
return constantPool.findReference(classIndex, nameAndTypeIndex);
}
*/
/*
** Public methods from ClassRead
*/
/*
** Implementation specific methods.
*/
/*
** Methods related to Constant Pool Table
*/
/**
Generic add entry to constant pool. Includes the logic
for an entry to occupy more than one slot (e.g. long).
@return The number of slots occupied by the entry.
.
*/
protected int addEntry(Object key, ConstantPoolEntry item) {
item.setIndex(cptEntries.size());
if (key != null)
cptHashTable.put(key, item);
cptEntries.addElement(item);
cptEstimatedSize += item.classFileSize();
if (item.doubleSlot()) {
cptEntries.addElement(null);
return 2;
} else {
return 1;
}
}
/**
Add an entry, but only if it doesn't exist.
@return the constant pool index of the added
or existing item.
*/
private int addDirectEntry(ConstantPoolEntry item) {
ConstantPoolEntry existingItem = findMatchingEntry(item);
if (existingItem != null) {
item = existingItem;
//foundCount++;
}
else {
addEntry(item.getKey(), item);
}
return item.getIndex();
}
/**
Add an index reference.
*/
private int addIndexReference(int tag, int i1, int i2) {
// search for the item using the pre-allocated object
searchIndex.set(tag, i1, i2);
ConstantPoolEntry item = findMatchingEntry(searchIndex);
if (item == null) {
item = new CONSTANT_Index_info(tag, i1, i2);
addEntry(item.getKey(), item);
}
return item.getIndex();
}
/**
Add a class entry to the pool.
*/
public int addClassReference(String fullyQualifiedName) {
if (ClassHolder.isExternalClassName(fullyQualifiedName)) {
fullyQualifiedName = ClassHolder.convertToInternalClassName(fullyQualifiedName);
// System.out.println("addClassReference " + fullyQualifiedName);
}
int name_index = addUtf8Entry(fullyQualifiedName).getIndex();
return addIndexReference(VMDescriptor.CONSTANT_Class, name_index, 0);
}
/**
Add a name and type entry
*/
private int addNameAndType(String name, String descriptor) {
int nameIndex = addUtf8Entry(name).getIndex();
int descriptorIndex = addUtf8Entry(descriptor).getIndex();
return addIndexReference(VMDescriptor.CONSTANT_NameAndType, nameIndex, descriptorIndex);
}
/**
Add a UTF8 into the pool and return the index to it.
*/
private CONSTANT_Utf8_info addUtf8Entry(String value) {
CONSTANT_Utf8_info item = (CONSTANT_Utf8_info) findMatchingEntry(value);
if (item == null) {
item = new CONSTANT_Utf8_info(value);
addEntry(value, item);
}
return item;
}
/**
Add an extra UTF8 into the pool
*/
private CONSTANT_Utf8_info addExtraUtf8(String value) {
CONSTANT_Utf8_info item = new CONSTANT_Utf8_info(value);
addEntry(null, item);
return item;
}
/**
Add a string entry
*/
private int addString(String value) {
CONSTANT_Utf8_info sutf = addUtf8Entry(value);
int valueIndex = sutf.setAsString();
if (valueIndex == 0) {
// string is already being used as code
valueIndex = addExtraUtf8(value).getIndex();
sutf.setAlternative(valueIndex);
}
return addIndexReference(VMDescriptor.CONSTANT_String, valueIndex, 0);
}
/**
Add a string entry
*/
private int addCodeUtf8(String value) {
CONSTANT_Utf8_info sutf = addUtf8Entry(value);
int index = sutf.setAsCode();
if (index == 0) {
// code string is already being used as string
CONSTANT_Utf8_info eutf = addExtraUtf8(value);
eutf.setAsCode(); // ensure the replace will happen
index = eutf.getIndex();
sutf.setAlternative(index);
}
return index;
}
protected void cptPut(ClassFormatOutput out) throws IOException {
for (Enumeration e = cptEntries.elements(); e.hasMoreElements(); ) {
ConstantPoolEntry item = (ConstantPoolEntry) e.nextElement();
if (item == null) {
continue;
}
item.put(out);
}
}
/*
** Methods to convert indexes to constant pool entries and vice-versa.
*/
public ConstantPoolEntry getEntry(int index) {
return (ConstantPoolEntry) cptEntries.elementAt(index);
}
/**
Return the class name for an index to a CONSTANT_Class_info.
*/
protected String className(int classIndex) {
CONSTANT_Index_info ci = (CONSTANT_Index_info) getEntry(classIndex);
return nameIndexToString(ci.getI1()).replace('/', '.');
}
/*
** Methods to find specific types of constant pool entries.
In these methods we try to avoid using the ConstantPoolEntry.matchValue()
as that requires creating a new object for the search. The matchValue()
call is really intended for when objects are being added to the constant pool.
*/
/**
Return the index of a UTF entry or -1 if it doesn't exist.
*/
int findUtf8(String value) {
ConstantPoolEntry item = findMatchingEntry(value);
if (item == null)
return -1;
return item.getIndex();
}
/**
Find a class descriptor (section 4.4.1) and return its
index, returns -1 if not found.
*/
public int findClass(String fullyQualifiedName) {
String internalName = ClassHolder.convertToInternalClassName(fullyQualifiedName);
int utf_index = findUtf8(internalName);
if (utf_index < 0)
return -1;
return findIndexIndex(VMDescriptor.CONSTANT_Class,
utf_index, 0);
}
/**
Find a name and type descriptor (section 4.4.6) and
return it's index.
<p>
returns -1 if not found.
*/
public int findNameAndType(String name, String descriptor) {
int name_index = findUtf8(name);
if (name_index < 0)
return -1;
int descriptor_index = findUtf8(descriptor);
if (descriptor_index < 0)
return -1;
return findIndexIndex(VMDescriptor.CONSTANT_NameAndType,
name_index, descriptor_index);
}
/*
public ClassMember findReference(int classIndex, int nameAndTypeIndex) {
CONSTANT_Index_info item = findIndexEntry(VMDescriptor.CONSTANT_Methodref,
classIndex, nameAndTypeIndex);
if (item == null) {
item = findIndexEntry(VMDescriptor.CONSTANT_InterfaceMethodref,
classIndex, nameAndTypeIndex);
if (item == null) {
item = findIndexEntry(VMDescriptor.CONSTANT_Fieldref,
classIndex, nameAndTypeIndex);
if (item == null)
return null;
}
}
return new ReferenceMember(this, item);
}
*/
protected CONSTANT_Index_info findIndexEntry(int tag, int i1, int i2) {
// search for the item using the pre-allocated object
searchIndex.set(tag, i1, i2);
return (CONSTANT_Index_info) findMatchingEntry(searchIndex);
}
protected int findIndexIndex(int tag, int i1, int i2) {
CONSTANT_Index_info item = findIndexEntry(tag, i1, i2);
if (item == null)
return -1;
return item.getIndex();
}
protected ConstantPoolEntry findMatchingEntry(Object key) {
return (ConstantPoolEntry) cptHashTable.get(key);
}
/** get a string (UTF) given a name_index into the constant pool
*/
String nameIndexToString(int index) {
return getEntry(index).toString();
}
/** get the class name of a Class given the index of its CONSTANT_Class_info
entry in the Constant Pool.
*/
protected String getClassName(int index) {
if (index == 0)
return ""; // must be the super class of java.lang.Object, ie. nothing.
return nameIndexToString(getEntry(index).getI1());
}
/*
* Determine whether the class descriptor string is
* in external format or not. Assumes that to be in external
* format means it must have a '.' or end in an ']'.
*
* @param className the name of the class to check
*
* @return true/false
*/
public static boolean isExternalClassName(String className)
{
int len;
if (className.indexOf('.') != -1)
{
return true;
}
else if ((len = className.length()) == 0)
{
return false;
}
return (className.charAt(len - 1) == ']');
}
/*
* Convert a class name to the internal VM class name format.
See sections 4.3.2, 4.4.1 of the vm spec.
* The normal leading 'L' and trailing ';' are left
* off of objects. This is intended primarily for
* the class manager.
* <p>
* An example of a conversion would be java.lang.Double[]
* to "[Ljava/lang/Double;".
<BR>
java.lang.Double would be converted to "java/lang/Double"
<BR>
Note that for array types the result of convertToInternalClassName()
and convertToInternalDescriptor() are identical.
*
* @param the external name (cannot be null)
*
* @return the internal string
*/
public static String convertToInternalClassName(String externalName)
{
return convertToInternal(externalName, false);
}
/*
* Convert a class name to internal JVM descriptor format.
See sections 4.3.2 of the vm spec.
* <p>
* An example of a conversion would be "java.lang.Double[]"
* to "[Ljava/lang/Double;".
*
<BR>
java.lang.Double would be converted to "Ljava/lang/Double;"
<BR>
Note that for array types the result of convertToInternalClassName()
and convertToInternalDescriptor() are identical.
* @param the external name (cannot be null)
*
* @return the internal string
*/
public static String convertToInternalDescriptor(String externalName)
{
return convertToInternal(externalName, true);
}
/*
** Workhorse method. Convert to internal format.
@param descriptor True if converting to descriptor format, false if
converting to class name format.
**
** Lifted from BCClass.java.
**
** Returns the result string.
*/
private static String convertToInternal(String externalName, boolean descriptor)
{
if (SanityManager.DEBUG)
{
SanityManager.ASSERT(externalName != null, "unexpected null");
}
int len = externalName.length();
String internalName;
String retVal = null;
int origLen = len;
int arity = 0;
// first walk through all array-ness
if (externalName.charAt(len-1) == ']')
{
while (len > 0
&& externalName.charAt(len-1) == ']'
&& externalName.charAt(len-2) == '[')
{
len -= 2;
arity++;
}
}
if (SanityManager.DEBUG) {
SanityManager.ASSERT(len > 0);
}
internalName = (origLen == len)?
externalName
: externalName.substring(0,len);
// then check for primitive types ...
// in length by expected frequency order
switch (len) {
case 7 :
if ("boolean".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_BOOLEAN, arity);
}
break;
case 4 :
if ("void".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_VOID, arity);
}
else if ("long".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_LONG, arity);
}
else if ("byte".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_BYTE, arity);
}
else if ("char".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_CHAR, arity);
}
break;
case 3 :
if ("int".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_INT, arity);
}
break;
case 6 :
if ("double".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_DOUBLE, arity);
}
break;
case 5 :
if ("short".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_SHORT, arity);
}
else if ("float".equals(internalName)) {
retVal = makeDesc(VMDescriptor.C_FLOAT, arity);
}
break;
}
// then it must be a Java class
if (retVal == null)
retVal = makeDesc(internalName, arity, descriptor);
return retVal;
}
/**
A helper to build a type description based on a built-in type
and an array arity.
*/
static private String makeDesc (char builtin, int arity) {
if (arity == 0)
switch (builtin) {
case VMDescriptor.C_BYTE : return VMDescriptor.BYTE;
case VMDescriptor.C_CHAR : return VMDescriptor.CHAR;
case VMDescriptor.C_DOUBLE : return VMDescriptor.DOUBLE;
case VMDescriptor.C_FLOAT : return VMDescriptor.FLOAT;
case VMDescriptor.C_INT : return VMDescriptor.INT;
case VMDescriptor.C_LONG : return VMDescriptor.LONG;
case VMDescriptor.C_SHORT : return VMDescriptor.SHORT;
case VMDescriptor.C_BOOLEAN : return VMDescriptor.BOOLEAN;
case VMDescriptor.C_VOID : return VMDescriptor.VOID;
default:
if (SanityManager.DEBUG)
SanityManager.THROWASSERT("No type match");
return null;
}
else {
StringBuffer desc = new StringBuffer(arity+3);
for (int i=0;i<arity;i++)
desc.append(VMDescriptor.C_ARRAY);
desc.append(ClassHolder.makeDesc(builtin, 0));
return desc.toString();
}
}
/**
A helper to build a type description based on a Java class
and an array arity.
If descriptor is true create a descriptor according to
section 4.3.2 of the vm spec. If false create a class name
according to sections 4.3.2 and 4.4.1 of the vm spec.
*/
static private String makeDesc (String className, int arity, boolean descriptor) {
if (!descriptor && (arity == 0)) {
return className.replace('.','/');
}
StringBuffer desc = new StringBuffer(arity+2+className.length());
for (int i=0;i<arity;i++)
desc.append(VMDescriptor.C_ARRAY);
desc.append(VMDescriptor.C_CLASS);
desc.append(className.replace('.','/'));
desc.append(VMDescriptor.C_ENDCLASS);
return desc.toString();
}
}
The table below shows all metrics for ClassHolder.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 93.00 | Number of blocks | |
| BLOCK_COMMENT | 162.00 | Number of block comment lines | |
| COMMENTS | 298.00 | Comment lines | |
| COMMENT_DENSITY | 0.84 | Comment density | |
| COMPARISONS | 61.00 | Number of comparison operators | |
| CYCLOMATIC | 124.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 55.00 | Comments in declarations | |
| DOC_COMMENT | 117.00 | Number of javadoc comment lines | |
| ELOC | 353.00 | Effective lines of code | |
| EXEC_COMMENTS | 13.00 | Comments in executable code | |
| EXITS | 72.00 | Procedure exits | |
| FUNCTIONS | 47.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 91.64 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 159.00 | 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 | 1.00 | 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 | 0.00 | 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 | 1.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 1.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 19.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 2.00 | 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 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | 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 | 2.00 | 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 | 2.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 1.00 | 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 | 1.00 | 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 | 3.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 2.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 44.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 28.00 | 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 | 1.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 1.00 | 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 | 12.00 | 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 | 1.00 | 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 | 1331.00 | 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 | 0.00 | 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 | 3.00 | 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 | 0.00 | 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 | 0.00 | 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 | 5.00 | 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 | 926.00 | Number of lines in the source file | |
| LINE_COMMENT | 19.00 | Number of line comments | |
| LOC | 452.00 | Lines of code | |
| LOGICAL_LINES | 231.00 | Number of statements | |
| LOOPS | 5.00 | Number of loops | |
| NEST_DEPTH | 5.00 | Maximum nesting depth | |
| OPERANDS | 1067.00 | Number of operands | |
| OPERATORS | 1935.00 | Number of operators | |
| PARAMS | 69.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 3002.00 | Halstead program length | |
| PROGRAM_VOCAB | 382.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 90.00 | Number of return points from functions | |
| SIZE | 23409.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 326.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 56.00 | Number of unique operators | |
| WHITESPACE | 176.00 | Number of whitespace lines | |