| /******************************************************************************* |
| * 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.Arrays; |
| import java.util.List; |
| import java.util.Vector; |
| |
| import org.eclipse.wst.command.internal.env.core.CommandFactory; |
| |
| |
| /** |
| * This class implements a sequence of CommandFragments. |
| **/ |
| public class SequenceFragment extends AbstractCommandFragment |
| { |
| private List fragmentList_; |
| |
| protected SequenceFragment( SequenceFragment frag ) |
| { |
| super( frag.getCommandFactory(), frag.getId() ); |
| |
| fragmentList_ = new Vector(); |
| |
| for( int index = 0; index < frag.fragmentList_.size(); index++ ) |
| { |
| Object newFrag = ((CommandFragment)frag.fragmentList_.get(index)).clone(); |
| fragmentList_.add( newFrag ); |
| } |
| } |
| |
| public SequenceFragment( CommandFragment[] fragments, |
| CommandFactory commandFactory, |
| String id ) |
| { |
| super( commandFactory, id ); |
| |
| if( fragments != null ) |
| { |
| fragmentList_ = Arrays.asList( fragments ); |
| } |
| else |
| { |
| fragmentList_ = new Vector(); |
| } |
| } |
| |
| public SequenceFragment() |
| { |
| super( null, "" ); |
| |
| fragmentList_ = new Vector(); |
| } |
| |
| /** |
| * Appends a fragment to the sequence. |
| **/ |
| public void add( CommandFragment fragment ) |
| { |
| fragmentList_.add( fragment ); |
| } |
| |
| /** |
| * Makes a copy of the CommandFragment. |
| * |
| * @return returns a copy of this fragment. |
| **/ |
| public Object clone() |
| { |
| return new SequenceFragment( 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() |
| { |
| CommandFragment fragment = null; |
| |
| if( fragmentList_ == null || fragmentList_.size() == 0 ) |
| { |
| fragment = null; |
| } |
| else |
| { |
| fragment = (CommandFragment)( fragmentList_.get(0) ); |
| } |
| |
| 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 ) |
| { |
| int index = fragmentList_.indexOf( fragment ); |
| |
| if( index == -1 ) |
| { |
| throw new IllegalArgumentException( "Fragment not found in sequence."); |
| } |
| else |
| { |
| index++; |
| |
| if( index >= fragmentList_.size() ) |
| { |
| // There is nothing following this fragment so return null; |
| return null; |
| } |
| else |
| { |
| // Return the next fragment. |
| return (CommandFragment)(fragmentList_.get( index )); |
| } |
| } |
| } |
| } |