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Java example source code file (AbstractGraph.java)

This example Java source code file (AbstractGraph.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractgraph, annotation, graph, object, override, string

The AbstractGraph.java Java example source code

/*
 * 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 javax.annotation.Nullable;

/**
 * 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
 */
public abstract class AbstractGraph<N> implements Graph {

  @Override
  public int degree(Object node) {
    // only works for non-multigraphs; multigraphs not yet supported
    return adjacentNodes(node).size();
  }

  @Override
  public int inDegree(Object node) {
    // only works for non-multigraphs; multigraphs not yet supported
    return predecessors(node).size();
  }

  @Override
  public int outDegree(Object node) {
    // only works for non-multigraphs; multigraphs not yet supported
    return successors(node).size();
  }

  @Override
  public boolean equals(@Nullable Object object) {
    if (!(object instanceof Graph)) {
      return false;
    }
    return Graphs.equal(this, (Graph<?>) object);
  }

  @Override
  public int hashCode() {
    return Graphs.hashCode(this);
  }

  @Override
  public String toString() {
    return Graphs.toString(this);
  }
}

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