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// ========================================================================
// Copyright (c) Webtide LLC
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at 
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.apache.org/licenses/LICENSE-2.0.txt
//
// You may elect to redistribute this code under either of these licenses. 
// ========================================================================
package org.eclipse.jetty.deploy.graph;

/**
 * Basic Graph Edge
 */
public final class Edge
{
    private Node _from;
    private Node _to;

    public Edge(Node from, Node to)
    {
        if (from==null || to==null || from==to)
            throw new IllegalArgumentException("from "+from+" to "+to);
        _from = from;
        _to = to;
    }

    @Override
    public int hashCode()
    {
        return _from.hashCode() ^ _to.hashCode();
    }

    @Override
    public boolean equals(Object obj)
    {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Edge other = (Edge)obj;
        if (_from == null)
        {
            if (other._from != null)
                return false;
        }
        else if (!_from.equals(other._from))
            return false;
        if (_to == null)
        {
            if (other._to != null)
                return false;
        }
        else if (!_to.equals(other._to))
            return false;
        return true;
    }

    public Node getFrom()
    {
        return _from;
    }

    public Node getTo()
    {
        return _to;
    }
    
    @Override
    public String toString()
    {
        return _from+"->"+_to;
    }
}