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/*******************************************************************************
* Copyright (c) 2004, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.command.internal.env.core.fragment;
import org.eclipse.wst.command.internal.env.core.CommandFactory;
import org.eclipse.wst.command.internal.env.core.common.Condition;
/**
* This class returns either the true fragment or the false fragment
* based on the response from the condition object.
**/
public class BooleanFragment extends AbstractCommandFragment
{
private CommandFragment trueFragment_;
private CommandFragment falseFragment_;
private Condition condition_;
/**
* Create a BooleanFragment with default values.
*
*/
public BooleanFragment()
{
this( null, null, new Condition()
{
public boolean evaluate()
{
return true;
}
},
null, "" );
}
/**
*
* @param trueFragment The fragment chosen if the condition is true.
* @param falseFragment The fragment chosen if the condition is false.
* @param condition The condition.
*/
public BooleanFragment( CommandFragment trueFragment,
CommandFragment falseFragment,
Condition condition )
{
this( trueFragment, falseFragment, condition, null, "" );
}
/**
* Creates a new BooleanFragment.
*
* @param trueFragment returned if condition is true.
* @param falseFragment returned if condition is false.
* @param condition the condition for this fragment.
* @param state the state passed to the condition.
* @param command the exectable command for this fragment.
**/
public BooleanFragment( CommandFragment trueFragment,
CommandFragment falseFragment,
Condition condition,
CommandFactory commandFactory,
String id )
{
super( commandFactory, id );
trueFragment_ = trueFragment;
falseFragment_ = falseFragment;
condition_ = condition;
}
/**
* Copy constructor.
* @param frag
*/
protected BooleanFragment( BooleanFragment frag )
{
this( null,
null,
frag.condition_,
frag.getCommandFactory(),
frag.getId() );
// Now we have to clone in the true and false
// fragments.
trueFragment_ = (CommandFragment)trueFragment_.clone();
falseFragment_ = (CommandFragment)falseFragment_.clone();
}
/**
* Makes a copy of the CommandFragment.
*
* @return returns a copy of this fragment.
**/
public Object clone()
{
return new BooleanFragment( this );
}
/**
* Gets the first child fragment for this fragment.
*
* @return returns the first child fragment for this fragment. Returns
* null when there is no first child.
**/
public CommandFragment getFirstSubFragment()
{
return condition_.evaluate() ? trueFragment_ : falseFragment_;
}
/**
* Gets the next child fragment for this fragment.
*
* @return returns the next child fragment for this fragment. Returns null
* when there is no next child.
**/
public CommandFragment getNextSubFragment( CommandFragment fragment )
{
return null;
}
/**
* Sets the condition.
* @param condition
*/
public void setCondition( Condition condition )
{
condition_ = condition;
}
/**
* Sets the true fragment.
* @param fragment
*/
public void setTrueFragment( CommandFragment fragment )
{
trueFragment_ = fragment;
}
/**
* Sets the false fragment.
* @param fragment
*/
public void setFalseFragment( CommandFragment fragment )
{
falseFragment_ = fragment;
}
}
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