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
 void add(Serializable key, Object value)
          

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

 Object eval(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.

 Object eval(Serializable key, Object defaultValue)
          

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

 Object get(Serializable key)
          

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

 Object put(Serializable key, Object value)
          

Return the previously stored value and store the specified key/value pair.

 Object put(Serializable key, String mapKey, Object value)
          

Store the specified mapKey/value in a Map that is internal to the helper, and return the previously stored value.

 Object remove(Serializable key)
          

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

 Object remove(Serializable key, 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

Object put(Serializable key,
           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
Since:
2.0

remove

Object remove(Serializable key)

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

Parameters:
key - the key to remove
Since:
2.0

put

Object put(Serializable key,
           String mapKey,
           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
Since:
2.0

get

Object get(Serializable key)

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

Parameters:
key - the key for which the value should be returned.
Since:
2.0

eval

Object eval(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.

Since:
2.0

eval

Object eval(Serializable key,
            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().
Since:
2.0

add

void add(Serializable key,
         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

Object remove(Serializable key,
              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.


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