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Introduce AbstractGraph. This is a bare-bones base class that all Gra…
…ph implementations should be able to extend (analogous to e.g. AbstractSet for Sets). It ensures there is consistent equals()/hashCode() across different Graph implementations. Additionally, this CL drops the requirement that two graphs have to have "the same type" to be equal. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=114901380
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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. | ||
| */ | ||
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| package com.google.common.graph; | ||
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| import javax.annotation.Nullable; | ||
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| /** | ||
| * This class provides a skeletal implementation of {@link Graph}. It is recommended to extend this | ||
| * class rather than implement {@link Graph} directly, to ensure consistent {@link #equals(Object)} | ||
| * and {@link #hashCode()} results across different graph implementations. | ||
| * | ||
| * @author James Sexton | ||
| * @param <N> Node parameter type | ||
| * @param <E> Edge parameter type | ||
| */ | ||
| public abstract class AbstractGraph<N, E> implements Graph<N, E> { | ||
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| protected final GraphConfig config; | ||
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| /** | ||
| * Not all subclasses necessarily need to expose a constructor that takes a {@link GraphConfig}, | ||
| * but they do need to provide the {@code config} here that will be returned by {@link #config()}. | ||
| */ | ||
| protected AbstractGraph(GraphConfig config) { | ||
| this.config = config; | ||
| } | ||
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| @Override | ||
| public GraphConfig config() { | ||
| return config; | ||
| } | ||
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| @Override | ||
| public long degree(Object node) { | ||
| return incidentEdges(node).size(); | ||
| } | ||
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| @Override | ||
| public long inDegree(Object node) { | ||
| return inEdges(node).size(); | ||
| } | ||
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| @Override | ||
| public long outDegree(Object node) { | ||
| return outEdges(node).size(); | ||
| } | ||
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| @Override | ||
| public boolean equals(@Nullable Object object) { | ||
| if (!(object instanceof Graph)) { | ||
| return false; | ||
| } | ||
| return Graphs.equal(this, (Graph<?, ?>) object); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Graphs.hashCode(this); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return Graphs.toString(this); | ||
| } | ||
| } |
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