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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 and graph edge.
 */
public interface Edge {
    /**
     * Returns the source vertex.
     *
     * @return Vertex  the source vertex
     */
    public Vertex getSource();

    /**
     * Returns the sink vertex.
     *
     * @return Vertex  the  sink vertex
     */
    public Vertex getSink();

    /**
     * Returns the vertex opposite to the specified vertex.
     *
     * @param vertex the vertex
     * @return Vertex  the opposite vertex
     */
    public Vertex getOppositeVertex(Vertex vertex);

}