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The DiffUtils library for computing diffs, applying patches, generationg side-by-side view in Java.
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package difflib.myers;

/**
 *  Represents a snake in a diffpath.
 * 
 *
 * {@link DiffNode DiffNodes} and {@link Snake Snakes} allow for compression
 * of diffpaths, as each snake is represented by a single {@link Snake Snake}
 * node and each contiguous series of insertions and deletions is represented
 * by a single {@link DiffNode DiffNodes}.
 *
 * @version $Revision: 69 $ $Date: 2003-10-13 11:00:44 +0300 (Пнд, 13 Окт 2003) $
 * @author Juanco Anez
 *
 */
public final class Snake extends PathNode {
    /**
     * Constructs a snake node.
     *
     * @param the position in the original sequence
     * @param the position in the revised sequence
     * @param prev the previous node in the path.
     */
    public Snake(int i, int j, PathNode prev) {
        super(i, j, prev);
    }
    
    /**
     * {@inheritDoc}
     * @return true always
     */
    public boolean isSnake() {
        return true;
    }
    
}