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The DiffUtils library for computing diffs, applying patches, generationg side-by-side view in Java

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/*
    Copyright 2009 Dmitry Naumenko ([email protected])
    
    This file is part of Java Diff Utills Library.

    Java Diff Utills Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Java Diff Utills Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Java Diff Utills Library.  If not, see .
 */
package difflib;

import java.util.List;

/**
 * Describes the change-delta between original and revised texts.
 * 
 * @author Dmitry Naumenko
 */
public class ChangeDelta extends Delta {
    
    /**
     * {@inheritDoc}
     */
    public ChangeDelta(Chunk original, Chunk revised) {
        super(original, revised);
    }
    
    /**
     * {@inheritDoc}
     * 
     * @throws PatchFailedException
     */
    @Override
    public void applyTo(List target) throws PatchFailedException {
        verify(target);
        int position = getOriginal().getPosition();
        int size = getOriginal().getSize();
        for (int i = 0; i < size; i++) {
            target.remove(position);
        }
        int i = 0;
        for (Object line : getRevised().getLines()) {
            target.add(position + i, line);
            i++;
        }
    }
    
    /**
     * {@inheritDoc}
     */
    @Override
    public void restore(List target) {
        int position = getRevised().getPosition();
        int size = getRevised().getSize();
        for (int i = 0; i < size; i++) {
            target.remove(position);
        }
        int i = 0;
        for (Object line : getOriginal().getLines()) {
            target.add(position + i, line);
            i++;
        }
    }
    
    /**
     * {@inheritDoc}
     */
    public void verify(List target) throws PatchFailedException {
        getOriginal().verify(target);
        if (getOriginal().getPosition() > target.size()) {
            throw new PatchFailedException("Incorrect patch for delta: "
                    + "delta original position > target size");
        }
    }
    
}
    

    

    

                
 
            

    

                
 
            



    
    






    
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