org.apache.taglibs.standard.lang.jstl
Class EnumeratedMap

java.lang.Object
  org.apache.taglibs.standard.lang.jstl.EnumeratedMap

All Implemented Interfaces:

Map

public abstract class EnumeratedMap
extends Object
implements Map

This is a Map implementation driven by a data source that only provides an enumeration of keys and a getValue(key) method. This class must be subclassed to implement those methods.

Some of the methods may incur a performance penalty that involves enumerating the entire data source. In these cases, the Map will try to save the results of that enumeration, but only if the underlying data source is immutable.

Version:

$Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $

Author:

Nathan Abramson - Art Technology Group

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

EnumeratedMap()

Method Summary

void	clear()
boolean	containsKey(Object pKey)
boolean	containsValue(Object pValue)
Set	entrySet()
abstract Enumeration	enumerateKeys() Returns an enumeration of the keys
Object	get(Object pKey)
Map	getAsMap() Converts the MapSource to a Map.
abstract Object	getValue(Object pKey) Returns the value associated with the given key, or null if not found.
boolean	isEmpty()
abstract boolean	isMutable() Returns true if it is possible for this data source to change
Set	keySet()
Object	put(Object pKey, Object pValue)
void	putAll(Map pMap)
Object	remove(Object pKey)
int	size()
Collection	values()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

EnumeratedMap

public EnumeratedMap()

Method Detail

clear

public void clear()

Specified by:

clear in interface Map

containsKey

public boolean containsKey(Object pKey)

Specified by:

containsKey in interface Map

containsValue

public boolean containsValue(Object pValue)

Specified by:

containsValue in interface Map

entrySet

public Set entrySet()

Specified by:

entrySet in interface Map

get

public Object get(Object pKey)

Specified by:

get in interface Map

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map

keySet

public Set keySet()

Specified by:

keySet in interface Map

put

public Object put(Object pKey,
                  Object pValue)

Specified by:

put in interface Map

putAll

public void putAll(Map pMap)

Specified by:

putAll in interface Map

remove

public Object remove(Object pKey)

Specified by:

remove in interface Map

size

public int size()

Specified by:

size in interface Map

values

public Collection values()

Specified by:

values in interface Map

enumerateKeys

public abstract Enumeration enumerateKeys()

Returns an enumeration of the keys

isMutable

public abstract boolean isMutable()

Returns true if it is possible for this data source to change

getValue

public abstract Object getValue(Object pKey)

Returns the value associated with the given key, or null if not found.

getAsMap

public Map getAsMap()

Converts the MapSource to a Map. If the map is not mutable, this is cached