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/*
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 * The Apache Software License, Version 1.1
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 * Copyright (c) 1999-2003 The Apache Software Foundation.
 * All rights reserved.
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package io.cucumber.datatable.dependency.difflib.myers;

/**
 * A node in a diffpath.
 *
 * @version $Revision: 69 $ $Date: 2003-10-13 11:00:44 +0300 (Пнд, 13 Окт 2003) $
 * @author Juanco Anez
 *
 * @see DiffNode
 * @see Snake
 *
 */
public abstract class PathNode {
    /** Position in the original sequence. */
    public final int i;
    /** Position in the revised sequence. */
    public final int j;
    /** The previous node in the path. */
    public final PathNode prev;
    
    /**
     * Concatenates a new path node with an existing diffpath.
     * @param i The position in the original sequence for the new node.
     * @param j The position in the revised sequence for the new node.
     * @param prev The previous node in the path.
     */
    public PathNode(int i, int j, PathNode prev) {
        this.i = i;
        this.j = j;
        this.prev = prev;
    }
    
    /**
     * Is this node a {@link Snake Snake node}?
     * @return true if this is a {@link Snake Snake node}
     */
    public abstract boolean isSnake();
    
    /**
     * Is this a bootstrap node?
     * 

* In bottstrap nodes one of the two corrdinates is * less than zero. * @return tru if this is a bootstrap node. */ public boolean isBootstrap() { return i < 0 || j < 0; } /** * Skips sequences of {@link DiffNode DiffNodes} until a * {@link Snake} or bootstrap node is found, or the end * of the path is reached. * @return The next first {@link Snake} or bootstrap node in the path, or * null * if none found. */ public final PathNode previousSnake() { if (isBootstrap()) return null; if (!isSnake() && prev != null) return prev.previousSnake(); return this; } /** * {@inheritDoc} */ public String toString() { StringBuffer buf = new StringBuffer("["); PathNode node = this; while (node != null) { buf.append("("); buf.append(Integer.toString(node.i)); buf.append(","); buf.append(Integer.toString(node.j)); buf.append(")"); node = node.prev; } buf.append("]"); return buf.toString(); } }





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