org.apache.commons.collections.map

Class FixedSizeMap

public class FixedSizeMap extends AbstractMapDecorator implements Map, BoundedMap, Serializable

Decorates another Map to fix the size, preventing add/remove.

Any action that would change the size of the map is disallowed. The put method is allowed to change the value associated with an existing key however.

If trying to remove or clear the map, an UnsupportedOperationException is thrown. If trying to put a new mapping into the map, an IllegalArgumentException is thrown. This is because the put method can succeed if the mapping's key already exists in the map, so the put method is not always unsupported.

Note that FixedSizeMap is not synchronized and is not thread-safe. If you wish to use this map from multiple threads concurrently, you must use appropriate synchronization. The simplest approach is to wrap this map using java.util.Collections#synchronizedMap(Map). This class may throw exceptions when accessed by concurrent threads without synchronization.

This class is Serializable from Commons Collections 3.1.

Since: Commons Collections 3.0

Version: $Revision: 348007 $ $Date: 2005-11-21 22:52:57 +0000 (Mon, 21 Nov 2005) $

Author: Stephen Colebourne Paul Jack

Constructor Summary
protected FixedSizeMap(Map map)
Constructor that wraps (not copies).
Method Summary
voidclear()
static Mapdecorate(Map map)
Factory method to create a fixed size map.
SetentrySet()
booleanisFull()
SetkeySet()
intmaxSize()
Objectput(Object key, Object value)
voidputAll(Map mapToCopy)
Objectremove(Object key)
Collectionvalues()

Constructor Detail

FixedSizeMap

protected FixedSizeMap(Map map)
Constructor that wraps (not copies).

Parameters: map the map to decorate, must not be null

Throws: IllegalArgumentException if map is null

Method Detail

clear

public void clear()

decorate

public static Map decorate(Map map)
Factory method to create a fixed size map.

Parameters: map the map to decorate, must not be null

Throws: IllegalArgumentException if map is null

entrySet

public Set entrySet()

isFull

public boolean isFull()

keySet

public Set keySet()

maxSize

public int maxSize()

put

public Object put(Object key, Object value)

putAll

public void putAll(Map mapToCopy)

remove

public Object remove(Object key)

values

public Collection values()
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