home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (Edge.java)

This example Java source code file (Edge.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

edge, nodeid, override

The Edge.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;

 * Edge in a guice dependency graph.
 * @author bojand@google.com (Bojan Djordjevic)
 * @since 4.0
public abstract class Edge {
  private final NodeId fromId;
  private final NodeId toId;

  protected Edge(NodeId fromId, NodeId toId) {
    this.fromId = fromId;
    this.toId = toId;

  public NodeId getFromId() {
    return fromId;

  public NodeId getToId() {
    return toId;

  @Override public boolean equals(Object obj) {
    if (!(obj instanceof Edge)) {
      return false;
    Edge other = (Edge) obj;
    return Objects.equal(fromId, other.fromId) && Objects.equal(toId, other.toId);

  @Override public int hashCode() {
    return Objects.hashCode(fromId, toId);

   * Returns a copy of the edge with new node IDs.
   * @param fromId new ID of the 'from' node
   * @param toId new ID of the 'to' node
   * @return copy of the edge with the new node IDs
  public abstract Edge copy(NodeId fromId, NodeId toId);

Other Java examples (source code examples)

Here is a short list of links related to this Java Edge.java source code file:

my book on functional programming


new blog posts


Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.