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Java example source code file (Node.java)

This example Java source code file (Node.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

node, nodeid, object, override

The Node.java Java example source code

 * Copyright (C) 2011 Google Inc.
 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.google.inject.grapher;

import com.google.common.base.Objects;

 * Node in a guice dependency graph.
 * @author bojand@google.com (Bojan Djordjevic)
 * @since 4.0
public abstract class Node {
   * When set to true, the source object is ignored in {@link #equals} and {@link #hashCode}.
   * Only used in tests.
  static boolean ignoreSourceInComparisons = false;

  private final NodeId id;
  private final Object source;

  protected Node(NodeId id, Object source) {
    this.id = id;
    this.source = source;

  public NodeId getId() {
    return id;

  public Object getSource() {
    return source;

  @Override public boolean equals(Object obj) {
    if (!(obj instanceof Node)) {
      return false;
    Node other = (Node) obj;
    return Objects.equal(id, other.id)
        && (ignoreSourceInComparisons || Objects.equal(source, other.source));

  @Override public int hashCode() {
    return ignoreSourceInComparisons ? id.hashCode() : Objects.hashCode(id, source);

   * Returns a copy of the node with a new ID.
   * @param id new ID of the node
   * @return copy of the node with a new ID
  public abstract Node copy(NodeId id);

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