/*
 * ====================================================================
 *
 * 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 acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * 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.commons.jrcs.diff;

import java.util.List;

/**
 * Holds an change-delta between to revisions of a text.
 *
 * @version $Id: ChangeDelta.java,v 1.1 2003/07/14 12:22:29 dchandler Exp $
 * @author <a href="mailto:juanco@suigeneris.org">Juanco Anez</a>
 * @see Delta
 * @see Diff
 * @see Chunk
 */
public class ChangeDelta extends Delta
{

    ChangeDelta()
    {
        super();
    }

    public ChangeDelta(Chunk orig, Chunk rev)
    {
        init(orig, rev);
    }

    public void verify(List target) throws PatchFailedException
    {
        if (!original.verify(target))
        {
            throw new PatchFailedException();
        }
        if (original.first() > target.size())
        {
            throw new PatchFailedException("original.first() > target.size()");
        }
    }

    public void applyTo(List target)
    {
        original.applyDelete(target);
        revised.applyAdd(original.first(), target);
    }

    public void toString(StringBuffer 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");
    }

    public void toRCSString(StringBuffer s, 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);
    }

    public void accept(RevisionVisitor visitor)
    {
        visitor.visit(this);
    }
}