Package jakarta.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 Details

    • 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
      Returns:
      the previously stored 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
      Returns:
      the removed value.
      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
      Returns:
      the value.
      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.
      Returns:
      the value.
      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.
      Returns:
      the evaluated value.
      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().
      Returns:
      the evaluated value.
      Since:
      2.0

    • eval

      Object eval(Serializable key, Supplier<Object> defaultValueSupplier)

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

      Parameters:
      key - the key for which the value should be returned.
      defaultValueSupplier - the supplier used to evaluate the default value if no value is found in the call to eval().
      Returns:
      the evaluated value.
      Since:
      4.0

    • 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.
      Returns:
      the removed value.