Package javax.faces.component

Interface StateHelper

All Superinterfaces:

StateHolder

public interface StateHelper
extends StateHolder

Define a Map-like contract that makes it easier for components to implement PartialStateHolder. Each UIComponent in the view will return an implementation of this interface from its UIComponent.getStateHelper() method.

Since:

2.0

Method Summary

Modifier and Type	Method	Description
void	add(java.io.Serializable key, java.lang.Object value)	Store the specified value in a List that is internal to the StateHelper.
java.lang.Object	eval(java.io.Serializable key)	Attempts to find a value associated with the specified key, using the value expression collection from the component if no such value is found.
java.lang.Object	eval(java.io.Serializable key, java.lang.Object defaultValue)	Performs the same logic as eval(java.io.Serializable) } but if no value is found, this will return the specified defaultValue
java.lang.Object	get(java.io.Serializable key)	Return the value currently associated with the specified key if any.
java.lang.Object	put(java.io.Serializable key, java.lang.Object value)	Return the previously stored value and store the specified key/value pair.
java.lang.Object	put(java.io.Serializable key, java.lang.String mapKey, java.lang.Object value)	Store the specified mapKey/value in a Map that is internal to the helper, and return the previously stored value.
java.lang.Object	remove(java.io.Serializable key)	Remove the key/value pair from the helper, returning the value previously stored under this key.
java.lang.Object	remove(java.io.Serializable key, java.lang.Object valueOrKey)	Remove a value from the inner data structure.

Methods inherited from interface javax.faces.component.StateHolder

isTransient, restoreState, saveState, setTransient

Method Detail

put

java.lang.Object put(java.io.Serializable key,
                     java.lang.Object value)

Return the previously stored value and store the specified key/value pair. This is intended to store data that would otherwise reside in an instance variable on the component.

Parameters:

key - the key for the value

value - the value

Returns:

the previously stored value

Since:

2.0

remove

java.lang.Object remove(java.io.Serializable key)

Remove the key/value pair from the helper, returning the value previously stored under this key.

Parameters:

key - the key to remove

Returns:

the removed value.

Since:

2.0

put

java.lang.Object put(java.io.Serializable key,
                     java.lang.String mapKey,
                     java.lang.Object value)

Store the specified mapKey/value in a Map that is internal to the helper, and return the previously stored value. The Map will then be associated with key.

It's important to note for delta tracking that any modifications to the internal Map be made through this method or remove(java.io.Serializable, Object).

Parameters:

key - the key of the map itself

mapKey - the key within the internal map

value - the value for the key in the internal map

Returns:

the value.

Since:

2.0

get

java.lang.Object get(java.io.Serializable key)

Return the value currently associated with the specified key if any.

Parameters:

key - the key for which the value should be returned.

Returns:

the value.

Since:

2.0

eval

java.lang.Object eval(java.io.Serializable key)

Attempts to find a value associated with the specified key, using the value expression collection from the component if no such value is found.

Parameters:

key - the name of the value in the internal map, or the name of a value expression in the components value expression collection.

Returns:

the evaluated value.

Since:

2.0

eval

java.lang.Object eval(java.io.Serializable key,
                      java.lang.Object defaultValue)

Performs the same logic as eval(java.io.Serializable) } but if no value is found, this will return the specified defaultValue

Parameters:

key - the key for which the value should be returned.

defaultValue - the value to return if no value is found in the call to eval().

Returns:

the evaluated value.

Since:

2.0

add

void add(java.io.Serializable key,
         java.lang.Object value)

Store the specified value in a List that is internal to the StateHelper.

It's important to note for delta tracking that any modifications to the internal List be made through this method or remove(java.io.Serializable, Object).

Parameters:

key - the key for which the value should be returned.

value - the value to add

Since:

2.0

remove

java.lang.Object remove(java.io.Serializable key,
                        java.lang.Object valueOrKey)

Remove a value from the inner data structure. Look in the inner data structure for the value at the given key. If the value is a Map, remove and return the value under the key given by the valueOrKey argument. If the value is a Collection, simply remove the value given by the argument valueOrKey and return null.

Parameters:

key - the key of in the inner data structure whose value is a Collection or Map

valueOrKey - the value or key to be removed.

Returns:

the removed value.