org.apache.commons.collections

Class MultiHashMap

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap

org.apache.commons.collections.MultiHashMap

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map, MultiMap

public class MultiHashMap
extends java.util.HashMap
implements MultiMap

MultiHashMap is the default implementation of the MultiMap interface. A MultiMap is a Map with slightly different semantics. Instead of returning an Object, it returns a Collection. So for example, you can put( key, new Integer(1) ); and then a Object get( key ); will return you a Collection instead of an Integer.

Since:

2.0

Author:

Christopher Berry, James Strachan, Steve Downey, Stephen Colebourne

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
MultiHashMap()
MultiHashMap(int initialCapacity)
MultiHashMap(int initialCapacity, float loadFactor)
MultiHashMap(java.util.Map mapToCopy)

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
java.lang.Object	clone()
boolean	containsValue(java.lang.Object value)
java.lang.String	getName()
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
void	putAll(java.util.Map mapToPut)
java.lang.Object	remove(java.lang.Object key, java.lang.Object item)
java.util.Collection	values()

Methods inherited from class java.util.HashMap

containsKey, entrySet, get, isEmpty, keySet, remove, size

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

containsKey, entrySet, equals, get, hashCode, isEmpty, keySet, remove, size

Constructor Detail

MultiHashMap

public MultiHashMap()

MultiHashMap

public MultiHashMap(int initialCapacity)

MultiHashMap

public MultiHashMap(int initialCapacity,
            float loadFactor)

MultiHashMap

public MultiHashMap(java.util.Map mapToCopy)

Method Detail

clear

public void clear()

Specified by:

clear in interface java.util.Map

Overrides:

clear in class java.util.HashMap

clone

public java.lang.Object clone()

Overrides:

clone in class java.util.HashMap

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map

Overrides:

containsValue in class java.util.HashMap

getName

public java.lang.String getName()

put

public java.lang.Object put(java.lang.Object key,
                   java.lang.Object value)

Specified by:

put in interface java.util.Map

Overrides:

put in class java.util.HashMap

putAll

public void putAll(java.util.Map mapToPut)

Specified by:

putAll in interface java.util.Map

Overrides:

putAll in class java.util.HashMap

remove

public java.lang.Object remove(java.lang.Object key,
                      java.lang.Object item)

Specified by:

remove in interface MultiMap

values

public java.util.Collection values()

Specified by:

values in interface java.util.Map

Overrides:

values in class java.util.HashMap