wicket-util/src/main/java/org/apache/wicket/util/diff/ChangeDelta.java

/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2003 The Apache Software Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 *    permission, please contact apache@apache.org.
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 * 5. Products derived from this software may not be called "Apache"
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 *
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.wicket.util.diff;

import java.util.List;

/**
 * Holds an change-delta between to revisions of a text.
 * 
 * @version $Id: ChangeDelta.java,v 1.1 2006/03/12 00:24:21 juanca Exp $
 * @author <a href="mailto:juanco@suigeneris.org">Juanco Anez</a>
 * @see Delta
 * @see Diff
 * @see Chunk
 */
public class ChangeDelta extends Delta
{

	ChangeDelta()
	{
		super();
	}

	/**
	 * Construct.
	 * 
	 * @param orig
	 * @param rev
	 */
	public ChangeDelta(final Chunk orig, final Chunk rev)
	{
		init(orig, rev);
	}

	/**
	 * @see org.apache.wicket.util.diff.Delta#verify(java.util.List)
	 */
	@Override
	public void verify(final List<Object> target) throws PatchFailedException
	{
		if (!original.verify(target))
		{
			throw new PatchFailedException();
		}
		if (original.first() > target.size())
		{
			throw new PatchFailedException("original.first() > target.size()");
		}
	}

	/**
	 * @see org.apache.wicket.util.diff.Delta#applyTo(java.util.List)
	 */
	@Override
	public void applyTo(final List<Object> target)
	{
		original.applyDelete(target);
		revised.applyAdd(original.first(), target);
	}

	/**
	 * @see org.apache.wicket.util.diff.Delta#toString(java.lang.StringBuffer)
	 */
	@Override
	public void toString(final StringBuilder s)
	{
		original.rangeString(s);
		s.append("c");
		revised.rangeString(s);
		s.append(Diff.NL);
		original.toString(s, "< ", "\n");
		s.append("---");
		s.append(Diff.NL);
		revised.toString(s, "> ", "\n");
	}

	/**
	 * @see org.apache.wicket.util.diff.Delta#toRCSString(java.lang.StringBuffer, java.lang.String)
	 */
	@Override
	public void toRCSString(final StringBuilder s, final String EOL)
	{
		s.append("d");
		s.append(original.rcsfrom());
		s.append(" ");
		s.append(original.size());
		s.append(EOL);
		s.append("a");
		s.append(original.rcsto());
		s.append(" ");
		s.append(revised.size());
		s.append(EOL);
		revised.toString(s, "", EOL);
	}

	/**
	 * @see org.apache.wicket.util.diff.Delta#accept(org.apache.wicket.util.diff.RevisionVisitor)
	 */
	@Override
	public void accept(final RevisionVisitor visitor)
	{
		visitor.visit(this);
	}
}