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/*
* Copyright (C) 2016 The Guava Authors
*
* 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 com.google.common.graph;
import com.google.common.annotations.Beta;
import org.checkerframework.checker.nullness.compatqual.NullableDecl;
/**
* This class provides a skeletal implementation of {@link Graph}. It is recommended to extend this
* class rather than implement {@link Graph} directly.
*
* @author James Sexton
* @param <N> Node parameter type
* @since 20.0
*/
@Beta
public abstract class AbstractGraph<N> extends AbstractBaseGraph<N> implements Graph<N> {
@Override
public final boolean equals(@NullableDecl Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Graph)) {
return false;
}
Graph<?> other = (Graph<?>) obj;
return isDirected() == other.isDirected()
&& nodes().equals(other.nodes())
&& edges().equals(other.edges());
}
@Override
public final int hashCode() {
return edges().hashCode();
}
/** Returns a string representation of this graph. */
@Override
public String toString() {
return "isDirected: "
+ isDirected()
+ ", allowsSelfLoops: "
+ allowsSelfLoops()
+ ", nodes: "
+ nodes()
+ ", edges: "
+ edges();
}
}
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