org.apache.tapestry5.corelib

## Enum LoopFormState

- java.lang.Object
- - java.lang.Enum<LoopFormState>
  - - org.apache.tapestry5.corelib.LoopFormState

- All Implemented Interfaces:
    Serializable, Comparable<LoopFormState>

      public enum LoopFormState
      extends Enum<LoopFormState>

  Identifies how a `LoopFormState` component stores state into the `FormSupport` object.
  Since:
    5.1.0.4

- - ### Enum Constant Summary

    Enum Constants
    Enum Constant and Description
    `ITERATION` Only enough state to iterate over the source values is stored.
    `NONE` No state of any kind is stored, as if the Loop was not contained within a `Form`.
    `VALUES` Stores a sequence of values (obtained via a `ValueEncoder`) into the Form state.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static LoopFormState` | `valueOf(String name)` Returns the enum constant of this type with the specified name.
    `static LoopFormState[]` | `values()` Returns an array containing the constants of this enum type, in the order they are declared.

    - ### Methods inherited from class java.lang.Enum

      `clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

    - ### Methods inherited from class java.lang.Object

      `getClass, notify, notifyAll, wait, wait, wait`

- - ### Enum Constant Detail

    - #### NONE

          public static final LoopFormState NONE

      No state of any kind is stored, as if the Loop was not contained within a `Form`.

    - #### ITERATION

          public static final LoopFormState ITERATION

      Only enough state to iterate over the source values is stored. When the Form is submitted, the Loop will re-acquire its source and iterate over it. This is equivalent to "volatile" mode in Tapestry 5.0. This can be subject to race conditions when the values within the source change between render and submit.

    - #### VALUES

          public static final LoopFormState VALUES

      Stores a sequence of values (obtained via a `ValueEncoder`) into the Form state. The source parameter is not re-acquired when the Form is submitted.

  - ### Method Detail

    - #### values

          public static LoopFormState[] values()

      Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

          for (LoopFormState c : LoopFormState.values())
              System.out.println(c);

      Returns:
        an array containing the constants of this enum type, in the order they are declared

    - #### valueOf

          public static LoopFormState valueOf(String name)

      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
        `name` - the name of the enum constant to be returned.
      Returns:
        the enum constant with the specified name
      Throws:
        `IllegalArgumentException` - if this enum type has no constant with the specified name
        `NullPointerException` - if the argument is null

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