de.frame4j.util

Class Action.Filter

java.lang.Object

de.frame4j.util.Action.Filter

All Implemented Interfaces:

Cloneable

Enclosing class:

Action

@MinDoc(copyright="Copyright 2004, 2009  A. Weinert",
        author="Albrecht Weinert",
        version="see enclosing class Action",
        lastModified="see enclosing class Action",
        lastModifiedBy="see enclosing class Action",
        usage="use to accept or reject an Action on base of its properties",
        purpose="filter a subset out of Actions")
public static class Action.Filter
extends Object
implements Cloneable

A filter for Actions.

This type is also the base class for more sophisticated filters.
Extending classes just overwrite accept(Action). In all implementations accept(null) must return false.

See Also:

Action, Action.makeCodeFilter(int), Action.select(Action[], Filter, CharSequence, boolean)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Filter() Make an Action Filter, that accepts all non null Actions.

Method Summary

Modifier and Type	Method and Description
boolean	accept(Action action) The Action filter.

Methods inherited from class java.lang.Object

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

Constructor Detail

Filter

protected Filter()

Make an Action Filter, that accepts all non null Actions.

As this basic Filter is immutable one (singleton) instance would serve this purpose. Use the filter Action.All for that purpose.

Method Detail

accept

public boolean accept(Action action)

The Action filter.

This implementation accepts every non null action.

To be overridden in inheriting classes.

Parameters:

action - the Action to be checked for acceptance

Returns:

true if action is not null