ChildOffsetMapper.java

/**
 * This file Copyright (c) 2005-2008 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Aptana provides a special exception to allow redistribution of this file
 * with certain other free and open source software ("FOSS") code and certain additional terms
 * pursuant to Section 7 of the GPL. You may view the exception and these
 * terms on the web at http://www.aptana.com/legal/gpl/.
 * 
 * 2. For the Aptana Public License (APL), this program and the
 * accompanying materials are made available under the terms of the APL
 * v1.0 which accompanies this distribution, and is available at
 * http://www.aptana.com/legal/apl/.
 * 
 * You may view the GPL, Aptana's exception and additional terms, and the
 * APL in the file titled license.html at the root of the corresponding
 * plugin containing this source file.
 * 
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.ide.editors.unified;

import com.aptana.ide.lexer.Lexeme;
import com.aptana.ide.lexer.LexemeList;
import com.aptana.ide.parsing.ICodeLocation;

/**
 * ChildOffsetMapper
 */
public class ChildOffsetMapper implements IChildOffsetMapper
{
	private IParentOffsetMapper parent;
	private boolean isDisposing = false;
	
	/**
	 * ChildOffsetMapper
	 * 
	 * @param parent
	 */
	public ChildOffsetMapper(IParentOffsetMapper parent)
	{
		if(parent == null)
		{
			throw new IllegalStateException(Messages.ChildOffsetMapper_NonNullParent);
		}
		else
		{
			this.parent = parent;
		}
	}

	/**
	 * @see com.aptana.ide.editors.unified.IChildOffsetMapper#getParent()
	 */
	public IParentOffsetMapper getParent()
	{
		return parent;
	}

	/**
	 * @see com.aptana.ide.parsing.IOffsetMapper#calculateCurrentLexeme(int)
	 */
	public void calculateCurrentLexeme(int offset)
	{
		parent.calculateCurrentLexeme(offset);
	}

	/**
	 * @see com.aptana.ide.editors.unified.IChildOffsetMapper#getFileService()
	 */
	public FileService getFileService()
	{
		return parent.getFileService();
	}

	/**
	 * @see com.aptana.ide.parsing.IOffsetMapper#getCurrentLexeme()
	 */
	public Lexeme getCurrentLexeme()
	{
		return parent.getCurrentLexeme();
	}

	/**
	 * @see com.aptana.ide.parsing.IOffsetMapper#getCurrentLexemeIndex()
	 */
	public int getCurrentLexemeIndex()
	{
		return parent.getCurrentLexemeIndex();
	}

	/**
	 * @see com.aptana.ide.parsing.IOffsetMapper#getLexemeAtIndex(int)
	 */
	public Lexeme getLexemeAtIndex(int index)
	{
		return parent.getLexemeAtIndex(index);
	}

	/**
	 * @see com.aptana.ide.parsing.IOffsetMapper#getLexemeIndexFromDocumentOffset(int)
	 */
	public int getLexemeIndexFromDocumentOffset(int offset)
	{
		return parent.getLexemeIndexFromDocumentOffset(offset);
	}

	/**
	 * @see com.aptana.ide.parsing.IOffsetMapper#getLexemeList()
	 */
	public LexemeList getLexemeList()
	{
		return parent.getLexemeList();
	}

	/**
	 * @see com.aptana.ide.editors.unified.IOffsetMapper#getScope(com.aptana.ide.lexer.Lexeme, com.aptana.ide.js.runtime.IScope)
	 */
//	public IScope getScope(Lexeme lex, IScope defaultScope)
//	{
//		return parent.getScope(lex, defaultScope);
//	}
	
	/**
	 * Gets the next lexeme based on the current caret position, or null if
	 * there is no next lexeme.
	 * 
	 * @return Returns the next lexeme based on the current caret position.
	 */
	public Lexeme getNextLexeme()
	{
		LexemeList lexemeList = getFileService().getLexemeList();
		if (lexemeList != null && lexemeList.size() > getCurrentLexemeIndex() + 1)
		{
			return lexemeList.get(getCurrentLexemeIndex() + 1);
		}
		else
		{
			return null;
		}
	}

	/**
	 * Gets the previous lexeme based on the current caret position.
	 * 
	 * @return Returns the previous lexeme based on the current caret position.
	 */
	public Lexeme getPreviousLexeme()
	{
		LexemeList lexemeList = getFileService().getLexemeList();
		if (lexemeList != null && lexemeList.size() > 1 && getCurrentLexemeIndex() > 1)
		{
			return lexemeList.get(getCurrentLexemeIndex() - 1);
		}
		else
		{
			return null;
		}
	}

	/**
	 * @see com.aptana.ide.parsing.IOffsetMapper#findTarget(com.aptana.ide.lexer.Lexeme)
	 */
	public ICodeLocation findTarget(Lexeme lexeme)
	{
		return null;
	}

	/**
	 * @see com.aptana.ide.editors.unified.IParentOffsetMapper#dispose()
	 */
	public void dispose()
	{
		if(isDisposing)
		{
			return;
		}
		isDisposing = true;	
		parent.dispose();
	}
}