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A modified version of some JGraph files
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/*
 * Copyright (c) 2005, David Benson
 *
 * All rights reserved.
 *
 * This file is licensed under the JGraph software license, a copy of which
 * will have been provided to you in the file LICENSE at the root of your
 * installation directory. If you are unable to locate this file please
 * contact JGraph sales for another copy.
 */
package com.jgraph.layout.hierarchical.model;

import java.util.ArrayList;
import java.util.List;

/**
 * An abstraction of a hierarchical edge for the hierarchy layout
 */
public class JGraphHierarchyEdge extends JGraphAbstractHierarchyCell {
	
	/**
	 * The graph edge(s) this object represents. Parallels edge are all grouped
	 * together within one hierarchy edge.
	 */
	public List edges;
	
	/**
	 * The node this edge is sourced at
	 */
	public JGraphHierarchyNode source;
	
	/**
	 * The node this edge targets
	 */
	public JGraphHierarchyNode target;
	
	/**
	 * Whether or not the direction of this edge has been reversed
	 * internally to create a DAG for the hierarchical layout
	 */
	protected boolean isReversed = false;
	
	/**
	 * Constructs a hierarchy edge
	 * @param edges a list of real graph edges this abstraction represents
	 */
	public JGraphHierarchyEdge(List edges) {
		this.edges = edges;
	}
	
	/**
	 * Inverts the direction of this internal edge(s)
	 */
	public void invert() {
		JGraphHierarchyNode temp = source;
		source = target;
		target = temp;
		isReversed = !isReversed;
	}

	/**
	 * @return Returns the isReversed.
	 */
	public boolean isReversed() {
		return isReversed;
	}

	/**
	 * @param isReversed The isReversed to set.
	 */
	public void setReversed(boolean isReversed) {
		this.isReversed = isReversed;
	}

	/**
	 * Returns the cells this cell connects to on the next layer up
	 * @param layer the layer this cell is on
	 * @return the cells this cell connects to on the next layer up
	 */
	public List getNextLayerConnectedCells(int layer) {
		if (nextLayerConnectedCells == null) {
			nextLayerConnectedCells = new ArrayList[temp.length];
			for (int i = 0; i < nextLayerConnectedCells.length; i++){
				nextLayerConnectedCells[i] = new ArrayList(2);
				if (i == nextLayerConnectedCells.length-1) {
					nextLayerConnectedCells[i].add(source);
				} else {
					nextLayerConnectedCells[i].add(this);
				}
			}
		}
		return nextLayerConnectedCells[layer - minRank - 1];
	}
	
	/**
	 * Returns the cells this cell connects to on the next layer down
	 * @param layer the layer this cell is on
	 * @return the cells this cell connects to on the next layer down
	 */
	public List getPreviousLayerConnectedCells(int layer) {
		if (previousLayerConnectedCells == null) {
			previousLayerConnectedCells = new ArrayList[temp.length];
			for (int i = 0; i < previousLayerConnectedCells.length; i++){
				previousLayerConnectedCells[i] = new ArrayList(2);
				if (i == 0) {
					previousLayerConnectedCells[i].add(target);
				} else {
					previousLayerConnectedCells[i].add(this);
				}
			}
		}
		return previousLayerConnectedCells[layer - minRank - 1];
	}

	/**
	 * 
	 * @return whether or not this cell is an edge
	 */
	public boolean isEdge() {
		return true;
	}

	/**
	 * 
	 * @return whether or not this cell is a node
	 */
	public boolean isVertex() {
		return false;
	}

	/**
	 * Gets the value of temp for the specified layer
	 * 
	 * @param layer
	 *            the layer relating to a specific entry into temp
	 * @return the value for that layer
	 */
	public int getGeneralPurposeVariable(int layer) {
		return temp[layer - minRank - 1];
	}
	
	/**
	 * Set the value of temp for the specified layer
	 * 
	 * @param layer
	 *            the layer relating to a specific entry into temp
	 * @param value
	 *            the value for that layer
	 */
	public void setGeneralPurposeVariable(int layer, int value) {
		temp[layer - minRank - 1] = value;
	}

}