org.apache.commons.collections.functors
Class WhileClosure

java.lang.Object
  org.apache.commons.collections.functors.WhileClosure

All Implemented Interfaces:

java.io.Serializable, Closure

public class WhileClosure
extends java.lang.Object
implements Closure, java.io.Serializable

Closure implementation that executes a closure repeatedly until a condition is met, like a do-while or while loop.

Since:

Commons Collections 3.0

Version:

$Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $

Author:

Stephen Colebourne

See Also:

Serialized Form

Constructor Summary

WhileClosure(Predicate predicate, Closure closure, boolean doLoop)
Constructor that performs no validation.

Method Summary

void	execute(java.lang.Object input) Executes the closure until the predicate is false.
Closure	getClosure() Gets the closure.
static Closure	getInstance(Predicate predicate, Closure closure, boolean doLoop) Factory method that performs validation.
Predicate	getPredicate() Gets the predicate in use.
boolean	isDoLoop() Is the loop a do-while loop.

Methods inherited from class java.lang.Object

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

Constructor Detail

WhileClosure

public WhileClosure(Predicate predicate,
                    Closure closure,
                    boolean doLoop)

Constructor that performs no validation. Use getInstance if you want that.

Parameters:

predicate - the predicate used to evaluate when the loop terminates, not null

closure - the closure the execute, not null

doLoop - true to act as a do-while loop, always executing the closure once

Method Detail

getInstance

public static Closure getInstance(Predicate predicate,
                                  Closure closure,
                                  boolean doLoop)

Factory method that performs validation.

Parameters:

predicate - the predicate used to evaluate when the loop terminates, not null

closure - the closure the execute, not null

doLoop - true to act as a do-while loop, always executing the closure once

Returns:

the while closure

Throws:

java.lang.IllegalArgumentException - if the predicate or closure is null

execute

public void execute(java.lang.Object input)

Executes the closure until the predicate is false.

Specified by:

execute in interface Closure

Parameters:

input - the input object

getPredicate

public Predicate getPredicate()

Gets the predicate in use.

Returns:

the predicate

Since:

Commons Collections 3.1

getClosure

public Closure getClosure()

Gets the closure.

Returns:

the closure

Since:

Commons Collections 3.1

isDoLoop

public boolean isDoLoop()

Is the loop a do-while loop.

Returns:

true is do-while, false if while

Since:

Commons Collections 3.1