ReferenceMap.java
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|---|---|---|
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org.apache.commons.collections |
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Commons Collections |
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 | |
|---|---|---|
| JAVA0034 | JAVA0034 Missing braces in if statement |  |
| JAVA0242 | JAVA0242 Transient field in non-Serializable class | |
| RETURNS | Number of return points from functions | |
| DECL_COMMENTS | Comments in declarations | |
| LOOPS | Number of loops | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| FUNCTIONS | Number of function declarations | |
| CYCLOMATIC | Cyclomatic complexity | |
| DOC_COMMENT | Number of javadoc comment lines | |
| COMMENTS | Comment lines | |
| SIZE | Size of the file in bytes | |
| LINES | Number of lines in the source file | |
| LOGICAL_LINES | Number of statements | |
| JAVA0239 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| COMPARISONS | Number of comparison operators | |
| OPERATORS | Number of operators | |
| JAVA0128 | JAVA0128 Public constructor in non-public class | |
| ELOC | Effective lines of code | |
| PROGRAM_LENGTH | Halstead program length | |
| PARAMS | Number of formal parameter declarations | |
| LOC | Lines of code | |
| JAVA0254 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| BLOCKS | Number of blocks | |
| JAVA0277 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0235 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| WHITESPACE | Number of whitespace lines | |
| OPERANDS | Number of operands | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| JAVA0259 | JAVA0259 Return of collection/array field | |
| JAVA0036 | JAVA0036 Missing braces in while statement | |
| UNIQUE_OPERANDS | Number of unique operands | |
| UNIQUE_OPERATORS | Number of unique operators | |
| JAVA0068 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0179 | JAVA0179 Local variable hides visible field | |
| EXITS | Procedure exits | |
| LINE_COMMENT | Number of line comments | |
| JAVA0029 | JAVA0029 Private method not used | |
| JAVA0163 | JAVA0163 Empty statement | |
| JAVA0150 | JAVA0150 java.lang.Error (or subclass) thrown | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0030 | JAVA0030 Private field not used | |
| EXEC_COMMENTS | Comments in executable code | |
| JAVA0100 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| 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.collections;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.util.AbstractCollection;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import org.apache.commons.collections.keyvalue.DefaultMapEntry;
/**
* Hash-based {@link Map} implementation that allows
* mappings to be removed by the garbage collector.<p>
*
* When you construct a <code>ReferenceMap</code>, you can
* specify what kind of references are used to store the
* map's keys and values. If non-hard references are
* used, then the garbage collector can remove mappings
* if a key or value becomes unreachable, or if the
* JVM's memory is running low. For information on how
* the different reference types behave, see
* {@link Reference}.<p>
*
* Different types of references can be specified for keys
* and values. The keys can be configured to be weak but
* the values hard, in which case this class will behave
* like a <a href="http://java.sun.com/j2se/1.4/docs/api/java/util/WeakHashMap.html">
* <code>WeakHashMap</code></a>. However, you
* can also specify hard keys and weak values, or any other
* combination. The default constructor uses hard keys
* and soft values, providing a memory-sensitive cache.<p>
*
* The algorithms used are basically the same as those
* in {@link java.util.HashMap}. In particular, you
* can specify a load factor and capacity to suit your
* needs. All optional {@link Map} operations are
* supported.<p>
*
* However, this {@link Map} implementation does <I>not</I>
* allow null elements. Attempting to add a null key or
* or a null value to the map will raise a
* <code>NullPointerException</code>.<p>
*
* As usual, this implementation is not synchronized. You
* can use {@link java.util.Collections#synchronizedMap} to
* provide synchronized access to a <code>ReferenceMap</code>.
*
* @see java.lang.ref.Reference
*
* @deprecated Moved to map subpackage. Due to be removed in v4.0.
* @since Commons Collections 2.1
* @version $Revision: 480452 $ $Date: 2006-11-29 02:45:14 -0500 (Wed, 29 Nov 2006) $
*
* @author Paul Jack
*/
public class ReferenceMap extends AbstractMap {
/**
* For serialization.
*/
private static final long serialVersionUID = -3370601314380922368L;
/**
* Constant indicating that hard references should be used.
*/
final public static int HARD = 0;
/**
* Constant indicating that soft references should be used.
*/
final public static int SOFT = 1;
/**
* Constant indicating that weak references should be used.
*/
final public static int WEAK = 2;
// --- serialized instance variables:
/**
* The reference type for keys. Must be HARD, SOFT, WEAK.
* Note: I originally marked this field as final, but then this class
* didn't compile under JDK1.2.2.
* @serial
*/
private int keyType;
/**
* The reference type for values. Must be HARD, SOFT, WEAK.
* Note: I originally marked this field as final, but then this class
* didn't compile under JDK1.2.2.
* @serial
*/
private int valueType;
/**
* The threshold variable is calculated by multiplying
* table.length and loadFactor.
* Note: I originally marked this field as final, but then this class
* didn't compile under JDK1.2.2.
* @serial
*/
private float loadFactor;
/**
* Should the value be automatically purged when the associated key has been collected?
*/
private boolean purgeValues = false;
// -- Non-serialized instance variables
/**
* ReferenceQueue used to eliminate stale mappings.
* See purge.
*/
private transient ReferenceQueue queue = new ReferenceQueue();
/**
* The hash table. Its length is always a power of two.
*/
private transient Entry[] table;
/**
* Number of mappings in this map.
*/
private transient int size;
/**
* When size reaches threshold, the map is resized.
* See resize().
*/
private transient int threshold;
/**
* Number of times this map has been modified.
*/
private transient volatile int modCount;
/**
* Cached key set. May be null if key set is never accessed.
*/
private transient Set keySet;
/**
* Cached entry set. May be null if entry set is never accessed.
*/
private transient Set entrySet;
/**
* Cached values. May be null if values() is never accessed.
*/
private transient Collection values;
/**
* Constructs a new <code>ReferenceMap</code> that will
* use hard references to keys and soft references to values.
*/
public ReferenceMap() {
this(HARD, SOFT);
}
/**
* Constructs a new <code>ReferenceMap</code> that will
* use the specified types of references.
*
* @param keyType the type of reference to use for keys;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
* @param valueType the type of reference to use for values;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
* @param purgeValues should the value be automatically purged when the
* key is garbage collected
*/
public ReferenceMap(int keyType, int valueType, boolean purgeValues) {
this(keyType, valueType);
this.purgeValues = purgeValues;
}
/**
* Constructs a new <code>ReferenceMap</code> that will
* use the specified types of references.
*
* @param keyType the type of reference to use for keys;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
* @param valueType the type of reference to use for values;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
*/
public ReferenceMap(int keyType, int valueType) {
this(keyType, valueType, 16, 0.75f);
}
/**
* Constructs a new <code>ReferenceMap</code> with the
* specified reference types, load factor and initial
* capacity.
*
* @param keyType the type of reference to use for keys;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
* @param valueType the type of reference to use for values;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
* @param capacity the initial capacity for the map
* @param loadFactor the load factor for the map
* @param purgeValues should the value be automatically purged when the
* key is garbage collected
*/
public ReferenceMap(
int keyType,
int valueType,
int capacity,
float loadFactor,
boolean purgeValues) {
this(keyType, valueType, capacity, loadFactor);
this.purgeValues = purgeValues;
}
/**
* Constructs a new <code>ReferenceMap</code> with the
* specified reference types, load factor and initial
* capacity.
*
* @param keyType the type of reference to use for keys;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
* @param valueType the type of reference to use for values;
* must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
* @param capacity the initial capacity for the map
* @param loadFactor the load factor for the map
*/
public ReferenceMap(int keyType, int valueType, int capacity, float loadFactor) {
super();
verify("keyType", keyType);
verify("valueType", valueType);
if (capacity <= 0) {
throw new IllegalArgumentException("capacity must be positive");
}
if ((loadFactor <= 0.0f) || (loadFactor >= 1.0f)) {
throw new IllegalArgumentException("Load factor must be greater than 0 and less than 1.");
}
this.keyType = keyType;
this.valueType = valueType;
int v = 1;
while (v < capacity) v *= 2;
this.table = new Entry[v];
this.loadFactor = loadFactor;
this.threshold = (int)(v * loadFactor);
}
// used by constructor
private static void verify(String name, int type) {
if ((type < HARD) || (type > WEAK)) {
throw new IllegalArgumentException(name +
" must be HARD, SOFT, WEAK.");
}
}
/**
* Writes this object to the given output stream.
*
* @param out the output stream to write to
* @throws IOException if the stream raises it
*/
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
out.writeInt(table.length);
// Have to use null-terminated list because size might shrink
// during iteration
for (Iterator iter = entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry)iter.next();
out.writeObject(entry.getKey());
out.writeObject(entry.getValue());
}
out.writeObject(null);
}
/**
* Reads the contents of this object from the given input stream.
*
* @param inp the input stream to read from
* @throws IOException if the stream raises it
* @throws ClassNotFoundException if the stream raises it
*/
private void readObject(ObjectInputStream inp) throws IOException, ClassNotFoundException {
inp.defaultReadObject();
table = new Entry[inp.readInt()];
threshold = (int)(table.length * loadFactor);
queue = new ReferenceQueue();
Object key = inp.readObject();
while (key != null) {
Object value = inp.readObject();
put(key, value);
key = inp.readObject();
}
}
/**
* Constructs a reference of the given type to the given
* referent. The reference is registered with the queue
* for later purging.
*
* @param type HARD, SOFT or WEAK
* @param referent the object to refer to
* @param hash the hash code of the <I>key</I> of the mapping;
* this number might be different from referent.hashCode() if
* the referent represents a value and not a key
*/
private Object toReference(int type, Object referent, int hash) {
switch (type) {
case HARD: return referent;
case SOFT: return new SoftRef(hash, referent, queue);
case WEAK: return new WeakRef(hash, referent, queue);
default: throw new Error();
}
}
/**
* Returns the entry associated with the given key.
*
* @param key the key of the entry to look up
* @return the entry associated with that key, or null
* if the key is not in this map
*/
private Entry getEntry(Object key) {
if (key == null) return null;
int hash = key.hashCode();
int index = indexFor(hash);
for (Entry entry = table[index]; entry != null; entry = entry.next) {
if ((entry.hash == hash) && key.equals(entry.getKey())) {
return entry;
}
}
return null;
}
/**
* Converts the given hash code into an index into the
* hash table.
*/
private int indexFor(int hash) {
// mix the bits to avoid bucket collisions...
hash += ~(hash << 15);
hash ^= (hash >>> 10);
hash += (hash << 3);
hash ^= (hash >>> 6);
hash += ~(hash << 11);
hash ^= (hash >>> 16);
return hash & (table.length - 1);
}
/**
* Resizes this hash table by doubling its capacity.
* This is an expensive operation, as entries must
* be copied from the old smaller table to the new
* bigger table.
*/
private void resize() {
Entry[] old = table;
table = new Entry[old.length * 2];
for (int i = 0; i < old.length; i++) {
Entry next = old[i];
while (next != null) {
Entry entry = next;
next = next.next;
int index = indexFor(entry.hash);
entry.next = table[index];
table[index] = entry;
}
old[i] = null;
}
threshold = (int)(table.length * loadFactor);
}
/**
* Purges stale mappings from this map.
* <p>
* Ordinarily, stale mappings are only removed during
* a write operation, although this method is called for both
* read and write operations to maintain a consistent state.
* <p>
* Note that this method is not synchronized! Special
* care must be taken if, for instance, you want stale
* mappings to be removed on a periodic basis by some
* background thread.
*/
private void purge() {
Reference ref = queue.poll();
while (ref != null) {
purge(ref);
ref = queue.poll();
}
}
private void purge(Reference ref) {
// The hashCode of the reference is the hashCode of the
// mapping key, even if the reference refers to the
// mapping value...
int hash = ref.hashCode();
int index = indexFor(hash);
Entry previous = null;
Entry entry = table[index];
while (entry != null) {
if (entry.purge(ref)) {
if (previous == null) table[index] = entry.next;
else previous.next = entry.next;
this.size--;
return;
}
previous = entry;
entry = entry.next;
}
}
/**
* Returns the size of this map.
*
* @return the size of this map
*/
public int size() {
purge();
return size;
}
/**
* Returns <code>true</code> if this map is empty.
*
* @return <code>true</code> if this map is empty
*/
public boolean isEmpty() {
purge();
return size == 0;
}
/**
* Returns <code>true</code> if this map contains the given key.
*
* @return true if the given key is in this map
*/
public boolean containsKey(Object key) {
purge();
Entry entry = getEntry(key);
if (entry == null) return false;
return entry.getValue() != null;
}
/**
* Returns the value associated with the given key, if any.
*
* @return the value associated with the given key, or <code>null</code>
* if the key maps to no value
*/
public Object get(Object key) {
purge();
Entry entry = getEntry(key);
if (entry == null) return null;
return entry.getValue();
}
/**
* Associates the given key with the given value.<p>
* Neither the key nor the value may be null.
*
* @param key the key of the mapping
* @param value the value of the mapping
* @return the last value associated with that key, or
* null if no value was associated with the key
* @throws NullPointerException if either the key or value
* is null
*/
public Object put(Object key, Object value) {
if (key == null) throw new NullPointerException("null keys not allowed");
if (value == null) throw new NullPointerException("null values not allowed");
purge();
if (size + 1 > threshold) resize();
int hash = key.hashCode();
int index = indexFor(hash);
Entry entry = table[index];
while (entry != null) {
if ((hash == entry.hash) && key.equals(entry.getKey())) {
Object result = entry.getValue();
entry.setValue(value);
return result;
}
entry = entry.next;
}
this.size++;
modCount++;
key = toReference(keyType, key, hash);
value = toReference(valueType, value, hash);
table[index] = new Entry(key, hash, value, table[index]);
return null;
}
/**
* Removes the key and its associated value from this map.
*
* @param key the key to remove
* @return the value associated with that key, or null if
* the key was not in the map
*/
public Object remove(Object key) {
if (key == null) return null;
purge();
int hash = key.hashCode();
int index = indexFor(hash);
Entry previous = null;
Entry entry = table[index];
while (entry != null) {
if ((hash == entry.hash) && key.equals(entry.getKey())) {
if (previous == null) table[index] = entry.next;
else previous.next = entry.next;
this.size--;
modCount++;
return entry.getValue();
}
previous = entry;
entry = entry.next;
}
return null;
}
/**
* Clears this map.
*/
public void clear() {
Arrays.fill(table, null);
size = 0;
while (queue.poll() != null); // drain the queue
}
/**
* Returns a set view of this map's entries.
*
* @return a set view of this map's entries
*/
public Set entrySet() {
if (entrySet != null) {
return entrySet;
}
entrySet = new AbstractSet() {
public int size() {
return ReferenceMap.this.size();
}
public void clear() {
ReferenceMap.this.clear();
}
public boolean contains(Object o) {
if (o == null) return false;
if (!(o instanceof Map.Entry)) return false;
Map.Entry e = (Map.Entry)o;
Entry e2 = getEntry(e.getKey());
return (e2 != null) && e.equals(e2);
}
public boolean remove(Object o) {
boolean r = contains(o);
if (r) {
Map.Entry e = (Map.Entry)o;
ReferenceMap.this.remove(e.getKey());
}
return r;
}
public Iterator iterator() {
return new EntryIterator();
}
public Object[] toArray() {
return toArray(new Object[0]);
}
public Object[] toArray(Object[] arr) {
ArrayList list = new ArrayList();
Iterator iterator = iterator();
while (iterator.hasNext()) {
Entry e = (Entry)iterator.next();
list.add(new DefaultMapEntry(e.getKey(), e.getValue()));
}
return list.toArray(arr);
}
};
return entrySet;
}
/**
* Returns a set view of this map's keys.
*
* @return a set view of this map's keys
*/
public Set keySet() {
if (keySet != null) return keySet;
keySet = new AbstractSet() {
public int size() {
return ReferenceMap.this.size();
}
public Iterator iterator() {
return new KeyIterator();
}
public boolean contains(Object o) {
return containsKey(o);
}
public boolean remove(Object o) {
Object r = ReferenceMap.this.remove(o);
return r != null;
}
public void clear() {
ReferenceMap.this.clear();
}
public Object[] toArray() {
return toArray(new Object[0]);
}
public Object[] toArray(Object[] array) {
Collection c = new ArrayList(size());
for (Iterator it = iterator(); it.hasNext(); ) {
c.add(it.next());
}
return c.toArray(array);
}
};
return keySet;
}
/**
* Returns a collection view of this map's values.
*
* @return a collection view of this map's values.
*/
public Collection values() {
if (values != null) return values;
values = new AbstractCollection() {
public int size() {
return ReferenceMap.this.size();
}
public void clear() {
ReferenceMap.this.clear();
}
public Iterator iterator() {
return new ValueIterator();
}
public Object[] toArray() {
return toArray(new Object[0]);
}
public Object[] toArray(Object[] array) {
Collection c = new ArrayList(size());
for (Iterator it = iterator(); it.hasNext(); ) {
c.add(it.next());
}
return c.toArray(array);
}
};
return values;
}
// If getKey() or getValue() returns null, it means
// the mapping is stale and should be removed.
private class Entry implements Map.Entry, KeyValue {
Object key;
Object value;
int hash;
Entry next;
public Entry(Object key, int hash, Object value, Entry next) {
this.key = key;
this.hash = hash;
this.value = value;
this.next = next;
}
public Object getKey() {
return (keyType > HARD) ? ((Reference)key).get() : key;
}
public Object getValue() {
return (valueType > HARD) ? ((Reference)value).get() : value;
}
public Object setValue(Object object) {
Object old = getValue();
if (valueType > HARD) ((Reference)value).clear();
value = toReference(valueType, object, hash);
return old;
}
public boolean equals(Object o) {
if (o == null) return false;
if (o == this) return true;
if (!(o instanceof Map.Entry)) return false;
Map.Entry entry = (Map.Entry)o;
Object key = entry.getKey();
Object value = entry.getValue();
if ((key == null) || (value == null)) return false;
return key.equals(getKey()) && value.equals(getValue());
}
public int hashCode() {
Object v = getValue();
return hash ^ ((v == null) ? 0 : v.hashCode());
}
public String toString() {
return getKey() + "=" + getValue();
}
boolean purge(Reference ref) {
boolean r = (keyType > HARD) && (key == ref);
r = r || ((valueType > HARD) && (value == ref));
if (r) {
if (keyType > HARD) ((Reference)key).clear();
if (valueType > HARD) {
((Reference)value).clear();
} else if (purgeValues) {
value = null;
}
}
return r;
}
}
private class EntryIterator implements Iterator {
// These fields keep track of where we are in the table.
int index;
Entry entry;
Entry previous;
// These Object fields provide hard references to the
// current and next entry; this assures that if hasNext()
// returns true, next() will actually return a valid element.
Object nextKey, nextValue;
Object currentKey, currentValue;
int expectedModCount;
public EntryIterator() {
index = (size() != 0 ? table.length : 0);
// have to do this here! size() invocation above
// may have altered the modCount.
expectedModCount = modCount;
}
public boolean hasNext() {
checkMod();
while (nextNull()) {
Entry e = entry;
int i = index;
while ((e == null) && (i > 0)) {
i--;
e = table[i];
}
entry = e;
index = i;
if (e == null) {
currentKey = null;
currentValue = null;
return false;
}
nextKey = e.getKey();
nextValue = e.getValue();
if (nextNull()) entry = entry.next;
}
return true;
}
private void checkMod() {
if (modCount != expectedModCount) {
throw new ConcurrentModificationException();
}
}
private boolean nextNull() {
return (nextKey == null) || (nextValue == null);
}
protected Entry nextEntry() {
checkMod();
if (nextNull() && !hasNext()) throw new NoSuchElementException();
previous = entry;
entry = entry.next;
currentKey = nextKey;
currentValue = nextValue;
nextKey = null;
nextValue = null;
return previous;
}
public Object next() {
return nextEntry();
}
public void remove() {
checkMod();
if (previous == null) throw new IllegalStateException();
ReferenceMap.this.remove(currentKey);
previous = null;
currentKey = null;
currentValue = null;
expectedModCount = modCount;
}
}
private class ValueIterator extends EntryIterator {
public Object next() {
return nextEntry().getValue();
}
}
private class KeyIterator extends EntryIterator {
public Object next() {
return nextEntry().getKey();
}
}
// These two classes store the hashCode of the key of
// of the mapping, so that after they're dequeued a quick
// lookup of the bucket in the table can occur.
private static class SoftRef extends SoftReference {
private int hash;
public SoftRef(int hash, Object r, ReferenceQueue q) {
super(r, q);
this.hash = hash;
}
public int hashCode() {
return hash;
}
}
private static class WeakRef extends WeakReference {
private int hash;
public WeakRef(int hash, Object r, ReferenceQueue q) {
super(r, q);
this.hash = hash;
}
public int hashCode() {
return hash;
}
}
}
The table below shows all metrics for ReferenceMap.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 92.00 | Number of blocks | |
| BLOCK_COMMENT | 16.00 | Number of block comment lines | |
| COMMENTS | 301.00 | Comment lines | |
| COMMENT_DENSITY | 0.77 | Comment density | |
| COMPARISONS | 77.00 | Number of comparison operators | |
| CYCLOMATIC | 138.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 47.00 | Comments in declarations | |
| DOC_COMMENT | 265.00 | Number of javadoc comment lines | |
| ELOC | 389.00 | Effective lines of code | |
| EXEC_COMMENTS | 4.00 | Comments in executable code | |
| EXITS | 52.00 | Procedure exits | |
| FUNCTIONS | 64.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 116.67 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 156.00 | 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 | 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 | 2.00 | JAVA0029 Private method not used | |
| JAVA0030 | 1.00 | 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 | 24.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 2.00 | 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 | 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 | 3.00 | 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 | 2.00 | 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 | 2.00 | 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 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 1.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 2.00 | 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 | 5.00 | 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 | 4.00 | 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 | 2.00 | 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 | 1.00 | 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 | 1.00 | 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 | 2.00 | 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 | 1.00 | 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 | 2.00 | 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 | 8.00 | 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 | 4.00 | 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 | 6.00 | 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 | 3.00 | 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 | 958.00 | Number of lines in the source file | |
| LINE_COMMENT | 20.00 | Number of line comments | |
| LOC | 488.00 | Lines of code | |
| LOGICAL_LINES | 290.00 | Number of statements | |
| LOOPS | 16.00 | Number of loops | |
| NEST_DEPTH | 3.00 | Maximum nesting depth | |
| OPERANDS | 1002.00 | Number of operands | |
| OPERATORS | 2171.00 | Number of operators | |
| PARAMS | 49.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 3173.00 | Halstead program length | |
| PROGRAM_VOCAB | 360.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 107.00 | Number of return points from functions | |
| SIZE | 27996.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 292.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 68.00 | Number of unique operators | |
| WHITESPACE | 169.00 | Number of whitespace lines | |