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## org.springframework.webflow.engine
Enum History

    java.lang.Object
      java.lang.Enum<History>
          org.springframework.webflow.engine.History

All Implemented Interfaces:
  java.io.Serializable, java.lang.Comparable<History>

    public enum History

extends java.lang.Enum<History>

View state history policies.

Author:
  Keith Donald
See Also:
  `ViewState`

Enum Constant Summary
`DISCARD` The history of the view state should be discarded when the view state exits to prevent back-tracking.
`INVALIDATE` The history of the view state and all previous view state should be invalidated to completely restrict back tracking.
`PRESERVE` The history of the view state should be preserved when the view state exits to support back-tracking.

Method Summary
`static History` | `valueOf(java.lang.String name)` Returns the enum constant of this type with the specified name.
`static History[]` | `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

### PRESERVE

    public static final History PRESERVE

  The history of the view state should be preserved when the view state exits to support back-tracking.

### DISCARD

    public static final History DISCARD

  The history of the view state should be discarded when the view state exits to prevent back-tracking.

### INVALIDATE

    public static final History INVALIDATE

  The history of the view state and all previous view state should be invalidated to completely restrict back tracking.

Method Detail

### values

    public static History[] 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 (History c : History.values())
          System.out.println(c);

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

### valueOf

    public static History valueOf(java.lang.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:
    `java.lang.IllegalArgumentException` - if this enum type has no constant with the specified name
    `java.lang.NullPointerException` - if the argument is null

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