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/*******************************************************************************
* Copyright (c) 2004 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 java.util.Enumeration;
import java.util.Hashtable;
import org.eclipse.wst.command.internal.provisional.env.core.CommandFactory;
import org.eclipse.wst.command.internal.provisional.env.core.common.Evaluate;
/**
* This class returns a fragment from a list of fragments based
* on the object returned from the Evaluate object.
**/
public class ChoiceFragment extends AbstractCommandFragment
{
private Hashtable fragmentTable_;
private Evaluate evaluate_;
/**
* Create a clone with new a new hashtable.
**/
protected ChoiceFragment( ChoiceFragment frag )
{
super( frag.getCommandFactory(), frag.getId() );
evaluate_ = frag.evaluate_;
fragmentTable_ = new Hashtable();
Enumeration keys = frag.fragmentTable_.keys();
// Clone the fragments in the table.
while( keys.hasMoreElements() )
{
Object key = keys.nextElement();
fragmentTable_.put( key, ((CommandFragment)frag.fragmentTable_.get(key)).clone() );
}
}
public ChoiceFragment( Object[] keys,
CommandFragment[] fragments )
{
this( keys, fragments, null, null, "" );
}
public ChoiceFragment( Object[] keys,
CommandFragment[] fragments,
Evaluate evaluate )
{
this( keys, fragments, evaluate, null, "" );
}
public void setEvaluate( Evaluate evaluate )
{
evaluate_ = evaluate;
}
/**
* Constructs a choice fragment. The key at index X is mapped to
* to the fragment at index X.
*
* @param keys these keys must be unique as determined by the equals method.
* They are used to identify which fragment to return.
* @param fragments these are the fragments to be returned. Null is not allowed
* as an entry in the array.
* @param evaluate the object returned by this evaluate object is used
* as the key to locate a fragment.
* @param state the state passed to evaluate.
**/
public ChoiceFragment( Object[] keys,
CommandFragment[] fragments,
Evaluate evaluate,
CommandFactory commandFactory,
String id )
{
super( commandFactory, id );
evaluate_ = evaluate;
fragmentTable_ = new Hashtable();
if( keys == null || fragments == null || keys.length != fragments.length )
{
throw new IllegalArgumentException( "Bad keys or fragments." );
}
else
{
// Create the fragment table.
for( int index = 0; index < keys.length; index++ )
{
fragmentTable_.put( keys[index], fragments[index] );
}
}
}
/**
* Makes a copy of the CommandFragment.
*
* @return returns a copy of this fragment.
**/
public Object clone()
{
return new ChoiceFragment( 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()
{
Object key = evaluate_.evaluate();
CommandFragment fragment = (CommandFragment)fragmentTable_.get(key);
if( fragment == null )
{
throw new IllegalArgumentException( "Key not found in table. Key=" + key );
}
return fragment;
}
/**
* 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;
}
}
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