MultiKeyMap.java
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|---|---|---|
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org.apache.commons.collections.map |
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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 | |
|---|---|---|
| PARAMS | Number of formal parameter declarations |  |
| COMPARISONS | Number of comparison operators | |
| LOOPS | Number of loops | |
| DOC_COMMENT | Number of javadoc comment lines | |
| CYCLOMATIC | Cyclomatic complexity | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| DECL_COMMENTS | Comments in declarations | |
| COMMENTS | Comment lines | |
| SIZE | Size of the file in bytes | |
| OPERANDS | Number of operands | |
| PROGRAM_LENGTH | Halstead program length | |
| OPERATORS | Number of operators | |
| LINES | Number of lines in the source file | |
| BLOCKS | Number of blocks | |
| RETURNS | Number of return points from functions | |
| FUNCTIONS | Number of function declarations | |
| LOC | Lines of code | |
| LOGICAL_LINES | Number of statements | |
| ELOC | Effective lines of code | |
| UNIQUE_OPERANDS | Number of unique operands | |
| JAVA0236 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0076 | JAVA0076 Use of magic number | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| JAVA0081 | JAVA0081 Boolean literal in comparison | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0058 | JAVA0058 Constructor calls super() | |
| PROGRAM_VOLUME | Halstead program volume | |
| UNIQUE_OPERATORS | Number of unique operators | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| EXITS | Procedure exits | |
| JAVA0138 | JAVA0138 N parameters defined for method (maximum: M) | |
| EXEC_COMMENTS | Comments in executable code | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0254 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| 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.map;
import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.commons.collections.IterableMap;
import org.apache.commons.collections.MapIterator;
import org.apache.commons.collections.keyvalue.MultiKey;
/**
* A <code>Map</code> implementation that uses multiple keys to map the value.
* <p>
* This class is the most efficient way to uses multiple keys to map to a value.
* The best way to use this class is via the additional map-style methods.
* These provide <code>get</code>, <code>containsKey</code>, <code>put</code> and
* <code>remove</code> for individual keys which operate without extra object creation.
* <p>
* The additional methods are the main interface of this map.
* As such, you will not normally hold this map in a variable of type <code>Map</code>.
* <p>
* The normal map methods take in and return a {@link MultiKey}.
* If you try to use <code>put()</code> with any other object type a
* <code>ClassCastException</code> is thrown. If you try to use <code>null</code> as
* the key in <code>put()</code> a <code>NullPointerException</code> is thrown.
* <p>
* This map is implemented as a decorator of a <code>AbstractHashedMap</code> which
* enables extra behaviour to be added easily.
* <ul>
* <li><code>MultiKeyMap.decorate(new LinkedMap())</code> creates an ordered map.
* <li><code>MultiKeyMap.decorate(new LRUMap())</code> creates an least recently used map.
* <li><code>MultiKeyMap.decorate(new ReferenceMap())</code> creates a garbage collector sensitive map.
* </ul>
* Note that <code>IdentityMap</code> and <code>ReferenceIdentityMap</code> are unsuitable
* for use as the key comparison would work on the whole MultiKey, not the elements within.
* <p>
* As an example, consider a least recently used cache that uses a String airline code
* and a Locale to lookup the airline's name:
* <pre>
* private MultiKeyMap cache = MultiKeyMap.decorate(new LRUMap(50));
*
* public String getAirlineName(String code, String locale) {
* String name = (String) cache.get(code, locale);
* if (name == null) {
* name = getAirlineNameFromDB(code, locale);
* cache.put(code, locale, name);
* }
* return name;
* }
* </pre>
* <p>
* <strong>Note that MultiKeyMap is not synchronized and is not thread-safe.</strong>
* If you wish to use this map from multiple threads concurrently, you must use
* appropriate synchronization. This class may throw exceptions when accessed
* by concurrent threads without synchronization.
*
* @since Commons Collections 3.1
* @version $Revision: 480452 $ $Date: 2006-11-29 02:45:14 -0500 (Wed, 29 Nov 2006) $
*
* @author Stephen Colebourne
*/
public class MultiKeyMap
implements IterableMap, Serializable {
/** Serialisation version */
private static final long serialVersionUID = -1788199231038721040L;
/** The decorated map */
protected final AbstractHashedMap map;
//-----------------------------------------------------------------------
/**
* Decorates the specified map to add the MultiKeyMap API and fast query.
* The map must not be null and must be empty.
*
* @param map the map to decorate, not null
* @throws IllegalArgumentException if the map is null or not empty
*/
public static MultiKeyMap decorate(AbstractHashedMap map) {
if (map == null) {
throw new IllegalArgumentException("Map must not be null");
}
if (map.size() > 0) {
throw new IllegalArgumentException("Map must be empty");
}
return new MultiKeyMap(map);
}
//-----------------------------------------------------------------------
/**
* Constructs a new MultiKeyMap that decorates a <code>HashedMap</code>.
*/
public MultiKeyMap() {
super();
map = new HashedMap();
}
/**
* Constructor that decorates the specified map and is called from
* {@link #decorate(AbstractHashedMap)}.
* The map must not be null and should be empty or only contain valid keys.
* This constructor performs no validation.
*
* @param map the map to decorate
*/
protected MultiKeyMap(AbstractHashedMap map) {
super();
this.map = map;
}
//-----------------------------------------------------------------------
/**
* Gets the value mapped to the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @return the mapped value, null if no match
*/
public Object get(Object key1, Object key2) {
int hashCode = hash(key1, key2);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2)) {
return entry.getValue();
}
entry = entry.next;
}
return null;
}
/**
* Checks whether the map contains the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @return true if the map contains the key
*/
public boolean containsKey(Object key1, Object key2) {
int hashCode = hash(key1, key2);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2)) {
return true;
}
entry = entry.next;
}
return false;
}
/**
* Stores the value against the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param value the value to store
* @return the value previously mapped to this combined key, null if none
*/
public Object put(Object key1, Object key2, Object value) {
int hashCode = hash(key1, key2);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2)) {
Object oldValue = entry.getValue();
map.updateEntry(entry, value);
return oldValue;
}
entry = entry.next;
}
map.addMapping(index, hashCode, new MultiKey(key1, key2), value);
return null;
}
/**
* Removes the specified multi-key from this map.
*
* @param key1 the first key
* @param key2 the second key
* @return the value mapped to the removed key, null if key not in map
*/
public Object remove(Object key1, Object key2) {
int hashCode = hash(key1, key2);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
AbstractHashedMap.HashEntry previous = null;
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2)) {
Object oldValue = entry.getValue();
map.removeMapping(entry, index, previous);
return oldValue;
}
previous = entry;
entry = entry.next;
}
return null;
}
/**
* Gets the hash code for the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @return the hash code
*/
protected int hash(Object key1, Object key2) {
int h = 0;
if (key1 != null) {
h ^= key1.hashCode();
}
if (key2 != null) {
h ^= key2.hashCode();
}
h += ~(h << 9);
h ^= (h >>> 14);
h += (h << 4);
h ^= (h >>> 10);
return h;
}
/**
* Is the key equal to the combined key.
*
* @param entry the entry to compare to
* @param key1 the first key
* @param key2 the second key
* @return true if the key matches
*/
protected boolean isEqualKey(AbstractHashedMap.HashEntry entry, Object key1, Object key2) {
MultiKey multi = (MultiKey) entry.getKey();
return
multi.size() == 2 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) &&
(key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1)));
}
//-----------------------------------------------------------------------
/**
* Gets the value mapped to the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @return the mapped value, null if no match
*/
public Object get(Object key1, Object key2, Object key3) {
int hashCode = hash(key1, key2, key3);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3)) {
return entry.getValue();
}
entry = entry.next;
}
return null;
}
/**
* Checks whether the map contains the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @return true if the map contains the key
*/
public boolean containsKey(Object key1, Object key2, Object key3) {
int hashCode = hash(key1, key2, key3);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3)) {
return true;
}
entry = entry.next;
}
return false;
}
/**
* Stores the value against the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param value the value to store
* @return the value previously mapped to this combined key, null if none
*/
public Object put(Object key1, Object key2, Object key3, Object value) {
int hashCode = hash(key1, key2, key3);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3)) {
Object oldValue = entry.getValue();
map.updateEntry(entry, value);
return oldValue;
}
entry = entry.next;
}
map.addMapping(index, hashCode, new MultiKey(key1, key2, key3), value);
return null;
}
/**
* Removes the specified multi-key from this map.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @return the value mapped to the removed key, null if key not in map
*/
public Object remove(Object key1, Object key2, Object key3) {
int hashCode = hash(key1, key2, key3);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
AbstractHashedMap.HashEntry previous = null;
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3)) {
Object oldValue = entry.getValue();
map.removeMapping(entry, index, previous);
return oldValue;
}
previous = entry;
entry = entry.next;
}
return null;
}
/**
* Gets the hash code for the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @return the hash code
*/
protected int hash(Object key1, Object key2, Object key3) {
int h = 0;
if (key1 != null) {
h ^= key1.hashCode();
}
if (key2 != null) {
h ^= key2.hashCode();
}
if (key3 != null) {
h ^= key3.hashCode();
}
h += ~(h << 9);
h ^= (h >>> 14);
h += (h << 4);
h ^= (h >>> 10);
return h;
}
/**
* Is the key equal to the combined key.
*
* @param entry the entry to compare to
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @return true if the key matches
*/
protected boolean isEqualKey(AbstractHashedMap.HashEntry entry, Object key1, Object key2, Object key3) {
MultiKey multi = (MultiKey) entry.getKey();
return
multi.size() == 3 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) &&
(key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1))) &&
(key3 == null ? multi.getKey(2) == null : key3.equals(multi.getKey(2)));
}
//-----------------------------------------------------------------------
/**
* Gets the value mapped to the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @return the mapped value, null if no match
*/
public Object get(Object key1, Object key2, Object key3, Object key4) {
int hashCode = hash(key1, key2, key3, key4);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4)) {
return entry.getValue();
}
entry = entry.next;
}
return null;
}
/**
* Checks whether the map contains the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @return true if the map contains the key
*/
public boolean containsKey(Object key1, Object key2, Object key3, Object key4) {
int hashCode = hash(key1, key2, key3, key4);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4)) {
return true;
}
entry = entry.next;
}
return false;
}
/**
* Stores the value against the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @param value the value to store
* @return the value previously mapped to this combined key, null if none
*/
public Object put(Object key1, Object key2, Object key3, Object key4, Object value) {
int hashCode = hash(key1, key2, key3, key4);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4)) {
Object oldValue = entry.getValue();
map.updateEntry(entry, value);
return oldValue;
}
entry = entry.next;
}
map.addMapping(index, hashCode, new MultiKey(key1, key2, key3, key4), value);
return null;
}
/**
* Removes the specified multi-key from this map.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @return the value mapped to the removed key, null if key not in map
*/
public Object remove(Object key1, Object key2, Object key3, Object key4) {
int hashCode = hash(key1, key2, key3, key4);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
AbstractHashedMap.HashEntry previous = null;
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4)) {
Object oldValue = entry.getValue();
map.removeMapping(entry, index, previous);
return oldValue;
}
previous = entry;
entry = entry.next;
}
return null;
}
/**
* Gets the hash code for the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @return the hash code
*/
protected int hash(Object key1, Object key2, Object key3, Object key4) {
int h = 0;
if (key1 != null) {
h ^= key1.hashCode();
}
if (key2 != null) {
h ^= key2.hashCode();
}
if (key3 != null) {
h ^= key3.hashCode();
}
if (key4 != null) {
h ^= key4.hashCode();
}
h += ~(h << 9);
h ^= (h >>> 14);
h += (h << 4);
h ^= (h >>> 10);
return h;
}
/**
* Is the key equal to the combined key.
*
* @param entry the entry to compare to
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @return true if the key matches
*/
protected boolean isEqualKey(AbstractHashedMap.HashEntry entry, Object key1, Object key2, Object key3, Object key4) {
MultiKey multi = (MultiKey) entry.getKey();
return
multi.size() == 4 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) &&
(key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1))) &&
(key3 == null ? multi.getKey(2) == null : key3.equals(multi.getKey(2))) &&
(key4 == null ? multi.getKey(3) == null : key4.equals(multi.getKey(3)));
}
//-----------------------------------------------------------------------
/**
* Gets the value mapped to the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @param key5 the fifth key
* @return the mapped value, null if no match
*/
public Object get(Object key1, Object key2, Object key3, Object key4, Object key5) {
int hashCode = hash(key1, key2, key3, key4, key5);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4, key5)) {
return entry.getValue();
}
entry = entry.next;
}
return null;
}
/**
* Checks whether the map contains the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @param key5 the fifth key
* @return true if the map contains the key
*/
public boolean containsKey(Object key1, Object key2, Object key3, Object key4, Object key5) {
int hashCode = hash(key1, key2, key3, key4, key5);
AbstractHashedMap.HashEntry entry = map.data[map.hashIndex(hashCode, map.data.length)];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4, key5)) {
return true;
}
entry = entry.next;
}
return false;
}
/**
* Stores the value against the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @param key5 the fifth key
* @param value the value to store
* @return the value previously mapped to this combined key, null if none
*/
public Object put(Object key1, Object key2, Object key3, Object key4, Object key5, Object value) {
int hashCode = hash(key1, key2, key3, key4, key5);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4, key5)) {
Object oldValue = entry.getValue();
map.updateEntry(entry, value);
return oldValue;
}
entry = entry.next;
}
map.addMapping(index, hashCode, new MultiKey(key1, key2, key3, key4, key5), value);
return null;
}
/**
* Removes the specified multi-key from this map.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @param key5 the fifth key
* @return the value mapped to the removed key, null if key not in map
*/
public Object remove(Object key1, Object key2, Object key3, Object key4, Object key5) {
int hashCode = hash(key1, key2, key3, key4, key5);
int index = map.hashIndex(hashCode, map.data.length);
AbstractHashedMap.HashEntry entry = map.data[index];
AbstractHashedMap.HashEntry previous = null;
while (entry != null) {
if (entry.hashCode == hashCode && isEqualKey(entry, key1, key2, key3, key4, key5)) {
Object oldValue = entry.getValue();
map.removeMapping(entry, index, previous);
return oldValue;
}
previous = entry;
entry = entry.next;
}
return null;
}
/**
* Gets the hash code for the specified multi-key.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @param key5 the fifth key
* @return the hash code
*/
protected int hash(Object key1, Object key2, Object key3, Object key4, Object key5) {
int h = 0;
if (key1 != null) {
h ^= key1.hashCode();
}
if (key2 != null) {
h ^= key2.hashCode();
}
if (key3 != null) {
h ^= key3.hashCode();
}
if (key4 != null) {
h ^= key4.hashCode();
}
if (key5 != null) {
h ^= key5.hashCode();
}
h += ~(h << 9);
h ^= (h >>> 14);
h += (h << 4);
h ^= (h >>> 10);
return h;
}
/**
* Is the key equal to the combined key.
*
* @param entry the entry to compare to
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @param key5 the fifth key
* @return true if the key matches
*/
protected boolean isEqualKey(AbstractHashedMap.HashEntry entry, Object key1, Object key2, Object key3, Object key4, Object key5) {
MultiKey multi = (MultiKey) entry.getKey();
return
multi.size() == 5 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) &&
(key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1))) &&
(key3 == null ? multi.getKey(2) == null : key3.equals(multi.getKey(2))) &&
(key4 == null ? multi.getKey(3) == null : key4.equals(multi.getKey(3))) &&
(key5 == null ? multi.getKey(4) == null : key5.equals(multi.getKey(4)));
}
//-----------------------------------------------------------------------
/**
* Removes all mappings where the first key is that specified.
* <p>
* This method removes all the mappings where the <code>MultiKey</code>
* has one or more keys, and the first matches that specified.
*
* @param key1 the first key
* @return true if any elements were removed
*/
public boolean removeAll(Object key1) {
boolean modified = false;
MapIterator it = mapIterator();
while (it.hasNext()) {
MultiKey multi = (MultiKey) it.next();
if (multi.size() >= 1 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0)))) {
it.remove();
modified = true;
}
}
return modified;
}
/**
* Removes all mappings where the first two keys are those specified.
* <p>
* This method removes all the mappings where the <code>MultiKey</code>
* has two or more keys, and the first two match those specified.
*
* @param key1 the first key
* @param key2 the second key
* @return true if any elements were removed
*/
public boolean removeAll(Object key1, Object key2) {
boolean modified = false;
MapIterator it = mapIterator();
while (it.hasNext()) {
MultiKey multi = (MultiKey) it.next();
if (multi.size() >= 2 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) &&
(key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1)))) {
it.remove();
modified = true;
}
}
return modified;
}
/**
* Removes all mappings where the first three keys are those specified.
* <p>
* This method removes all the mappings where the <code>MultiKey</code>
* has three or more keys, and the first three match those specified.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @return true if any elements were removed
*/
public boolean removeAll(Object key1, Object key2, Object key3) {
boolean modified = false;
MapIterator it = mapIterator();
while (it.hasNext()) {
MultiKey multi = (MultiKey) it.next();
if (multi.size() >= 3 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) &&
(key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1))) &&
(key3 == null ? multi.getKey(2) == null : key3.equals(multi.getKey(2)))) {
it.remove();
modified = true;
}
}
return modified;
}
/**
* Removes all mappings where the first four keys are those specified.
* <p>
* This method removes all the mappings where the <code>MultiKey</code>
* has four or more keys, and the first four match those specified.
*
* @param key1 the first key
* @param key2 the second key
* @param key3 the third key
* @param key4 the fourth key
* @return true if any elements were removed
*/
public boolean removeAll(Object key1, Object key2, Object key3, Object key4) {
boolean modified = false;
MapIterator it = mapIterator();
while (it.hasNext()) {
MultiKey multi = (MultiKey) it.next();
if (multi.size() >= 4 &&
(key1 == null ? multi.getKey(0) == null : key1.equals(multi.getKey(0))) &&
(key2 == null ? multi.getKey(1) == null : key2.equals(multi.getKey(1))) &&
(key3 == null ? multi.getKey(2) == null : key3.equals(multi.getKey(2))) &&
(key4 == null ? multi.getKey(3) == null : key4.equals(multi.getKey(3)))) {
it.remove();
modified = true;
}
}
return modified;
}
//-----------------------------------------------------------------------
/**
* Check to ensure that input keys are valid MultiKey objects.
*
* @param key the key to check
*/
protected void checkKey(Object key) {
if (key == null) {
throw new NullPointerException("Key must not be null");
}
if (key instanceof MultiKey == false) {
throw new ClassCastException("Key must be a MultiKey");
}
}
/**
* Clones the map without cloning the keys or values.
*
* @return a shallow clone
*/
public Object clone() {
return new MultiKeyMap((AbstractHashedMap) map.clone());
}
/**
* Puts the key and value into the map, where the key must be a non-null
* MultiKey object.
*
* @param key the non-null MultiKey object
* @param value the value to store
* @return the previous value for the key
* @throws NullPointerException if the key is null
* @throws ClassCastException if the key is not a MultiKey
*/
public Object put(Object key, Object value) {
checkKey(key);
return map.put(key, value);
}
/**
* Copies all of the keys and values from the specified map to this map.
* Each key must be non-null and a MultiKey object.
*
* @param mapToCopy to this map
* @throws NullPointerException if the mapToCopy or any key within is null
* @throws ClassCastException if any key in mapToCopy is not a MultiKey
*/
public void putAll(Map mapToCopy) {
for (Iterator it = mapToCopy.keySet().iterator(); it.hasNext();) {
Object key = it.next();
checkKey(key);
}
map.putAll(mapToCopy);
}
//-----------------------------------------------------------------------
public MapIterator mapIterator() {
return map.mapIterator();
}
public int size() {
return map.size();
}
public boolean isEmpty() {
return map.isEmpty();
}
public boolean containsKey(Object key) {
return map.containsKey(key);
}
public boolean containsValue(Object value) {
return map.containsValue(value);
}
public Object get(Object key) {
return map.get(key);
}
public Object remove(Object key) {
return map.remove(key);
}
public void clear() {
map.clear();
}
public Set keySet() {
return map.keySet();
}
public Collection values() {
return map.values();
}
public Set entrySet() {
return map.entrySet();
}
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
return map.equals(obj);
}
public int hashCode() {
return map.hashCode();
}
public String toString() {
return map.toString();
}
}
The table below shows all metrics for MultiKeyMap.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 109.00 | Number of blocks | |
| BLOCK_COMMENT | 16.00 | Number of block comment lines | |
| COMMENTS | 378.00 | Comment lines | |
| COMMENT_DENSITY | 1.03 | Comment density | |
| COMPARISONS | 152.00 | Number of comparison operators | |
| CYCLOMATIC | 173.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 48.00 | Comments in declarations | |
| DOC_COMMENT | 353.00 | Number of javadoc comment lines | |
| ELOC | 366.00 | Effective lines of code | |
| EXEC_COMMENTS | 0.00 | Comments in executable code | |
| EXITS | 44.00 | Procedure exits | |
| FUNCTIONS | 49.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 111.23 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 183.00 | 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 | 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 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 2.00 | 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 | 12.00 | 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 | 1.00 | 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 | 1.00 | 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 | 2.00 | 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 | 1.00 | 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 | 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 | 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 | 1.00 | 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 | 1.00 | 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 | 1.00 | 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 | 913.00 | Number of lines in the source file | |
| LINE_COMMENT | 9.00 | Number of line comments | |
| LOC | 476.00 | Lines of code | |
| LOGICAL_LINES | 229.00 | Number of statements | |
| LOOPS | 21.00 | Number of loops | |
| NEST_DEPTH | 3.00 | Maximum nesting depth | |
| OPERANDS | 1483.00 | Number of operands | |
| OPERATORS | 2497.00 | Number of operators | |
| PARAMS | 113.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 3980.00 | Halstead program length | |
| PROGRAM_VOCAB | 368.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 70.00 | Number of return points from functions | |
| SIZE | 31954.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 320.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 48.00 | Number of unique operators | |
| WHITESPACE | 59.00 | Number of whitespace lines | |