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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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