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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.util.graph;

/**
 * Represents a directed edge in a graph.
 */
public class EdgeImpl implements Edge {
    private Vertex source;
    private Vertex sink;

    public EdgeImpl(Vertex source, Vertex sink) {
        this.source = source;
        this.sink = sink;
    }

    public Vertex getSource() {
        return source;
    }

    public Vertex getSink() {
        return sink;
    }

    public Vertex getOppositeVertex(Vertex v) {
        if (this.source == v) {
            return this.sink;
        } else if (this.sink == v) {
            return this.source;
        } else {
            throw new AssertionError();
        }
    }
}