/*
 * Copyright 2014 Open Networking Laboratory
 *
 * 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.
 */
package org.onlab.graph;

/**
 * Abstraction of a graph edge weight function.
 */
public interface EdgeWeight<V extends Vertex, E extends Edge<V>> {

    /**
     * Returns the weight of the given edge as a unit-less number.
     *
     * @param edge edge to be weighed
     * @return edge weight as a unit-less number
     */
    double weight(E edge);

}