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/*
* 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;
import java.util.Objects;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Abstract graph edge implementation.
*/
public abstract class AbstractEdge<V extends Vertex> implements Edge<V> {
private final V src;
private final V dst;
/**
* Creates a new edge between the specified source and destination vertexes.
*
* @param src source vertex
* @param dst destination vertex
*/
public AbstractEdge(V src, V dst) {
this.src = checkNotNull(src, "Source vertex cannot be null");
this.dst = checkNotNull(dst, "Destination vertex cannot be null");
}
@Override
public V src() {
return src;
}
@Override
public V dst() {
return dst;
}
@Override
public int hashCode() {
return Objects.hash(src, dst);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof AbstractEdge) {
final AbstractEdge other = (AbstractEdge) obj;
return Objects.equals(this.src, other.src) && Objects.equals(this.dst, other.dst);
}
return false;
}
@Override
public String toString() {
return toStringHelper(this)
.add("src", src)
.add("dst", dst)
.toString();
}
}
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