public abstract class LocalContext
extends AbstractContext 

 import javolution.context.LocalContext.Parameter;
 public class ModuloInteger extends Number {
 public static final Parameter<Integer> MODULO = new Parameter<Integer>() {
 protected Integer getDefault() { return -1; }
 }; 
 public ModuloInteger times(ModuloInteger that) { ... } 
 } 
 LocalContext ctx = LocalContext.enter(); 
 try {
 ctx.supersede(ModuloInteger.MODULO, 13); // Sets local modulo value.
 x = a.times(b).plus(c.times(d)); // Operations modulo 13
 ...
 } finally {
 ctx.exit(); // Reverts to previous modulo setting. 
 }

Version:

6.0 December 12, 2012

Author:

Jean-Marie Dautelle

• Nested Class Summary

  Nested Classes

  Modifier and Type	Class and Description
  static class	LocalContext.Parameter<T> A configurable parameter whose value can be locally superseded within the scope of LocalContext.

• Constructor Summary

  Constructors

  Modifier	Constructor and Description
  protected	LocalContext () Default constructor.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  static LocalContext	enter () Enters and returns a new local context instance.
  protected abstract <T> T	getValue (LocalContext.Parameter<T> param, T defaultValue) Returns the local value of the specified parameter or the specified default value if not superseded.
  abstract <T> void	supersede (LocalContext.Parameter<T> param, T localValue) Supersedes the value of the specified parameter.

  • Methods inherited from class javolution.context.AbstractContext

    current, current, enter, enterInner, exit, getOuter, inherit, inner

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Detail

  • LocalContext

    protected LocalContext()

    Default constructor.

• Method Detail

  • enter

    public static LocalContext enter()

    Enters and returns a new local context instance.

  • supersede

    public abstract <T> void supersede(LocalContext.Parameter<T> param,
     T localValue)

    Supersedes the value of the specified parameter.

    Parameters:

    param - the local parameter whose local value is overridden.

    localValue - the new local value.

    Throws:

    SecurityException - if the permission to override the specified parameter is not granted.

    NullPointerException - if the specified local value is null.

  • getValue

    protected abstract <T> T getValue(LocalContext.Parameter<T> param,
     T defaultValue)

    Returns the local value of the specified parameter or the specified default value if not superseded.

    Parameters:

    param - the local parameter whose local value is returned.

    defaultValue - the parameter value if not superseded.