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/*
* ====================================================================
*
* 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
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 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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* 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
* .
*
*/
package org.apache.wicket.util.diff;
import java.util.List;
/**
* Holds a "delta" difference between to revisions of a text.
*
* @version $Revision: 1.1 $ $Date: 2006/03/12 00:24:21 $
*
* @author Juanco Anez
* @author Brian McBride
* @see Diff
* @see Chunk
* @see Revision modifications
*
* 27 Apr 2003 bwm
*
* Added getOriginal() and getRevised() accessor methods Added visitor pattern accept() method
*/
public abstract class Delta extends ToString
{
protected Chunk original;
protected Chunk revised;
static Class[][] DeltaClass;
static
{
DeltaClass = new Class[2][2];
try
{
DeltaClass[0][0] = ChangeDelta.class;
DeltaClass[0][1] = AddDelta.class;
DeltaClass[1][0] = DeleteDelta.class;
DeltaClass[1][1] = ChangeDelta.class;
}
catch (Exception ignored)
{
}
}
/**
* Returns a Delta that corresponds to the given chunks in the original and revised text
* respectively.
*
* @param orig
* the chunk in the original text.
* @param rev
* the chunk in the revised text.
* @return Delta
*/
public static Delta newDelta(final Chunk orig, final Chunk rev)
{
Class c = DeltaClass[orig.size() > 0 ? 1 : 0][rev.size() > 0 ? 1 : 0];
Delta result;
try
{
result = (Delta)c.newInstance();
}
catch (Exception e)
{
return null;
}
result.init(orig, rev);
return result;
}
/**
* Creates an uninitialized delta.
*/
protected Delta()
{
}
/**
* Creates a delta object with the given chunks from the original and revised texts.
*
* @param orig
* @param rev
*/
protected Delta(final Chunk orig, final Chunk rev)
{
init(orig, rev);
}
/**
* Initializes the delta with the given chunks from the original and revised texts.
*
* @param orig
* @param rev
*/
protected void init(final Chunk orig, final Chunk rev)
{
original = orig;
revised = rev;
}
/**
* Verifies that this delta can be used to patch the given text.
*
* @param target
* the text to patch.
* @throws PatchFailedException
* if the patch cannot be applied.
*/
public abstract void verify(List
