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Java example source code file (NodeId.java)

This example Java source code file (NodeId.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

instance, key, nodeid, nodetype, override, string

The NodeId.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;
import com.google.inject.Key;

 * ID of a node in the graph. An ID is given by a {@link Key} and a node type, which is used to
 * distinguish instances and implementation classes for the same key. For example
 * {@code bind(Integer.class).toInstance(42)} produces two nodes: an
 * interface node with the key of {@code Key<Integer>} and an instance node with the same
 * {@link Key} and value of 42.
 * @author bojand@google.com (Bojan Djordjevic)
 * @since 4.0
public final class NodeId {

   * Type of node.
   * @since 4.0
  public enum NodeType {
    /** Type or class node. */

    /** Instance node, used when something is bound to an instance. */

  private final Key<?> key;
  private final NodeType nodeType;

  private NodeId(Key<?> key, NodeType nodeType) {
    this.key = key;
    this.nodeType = nodeType;

  public static NodeId newTypeId(Key<?> key) {
    return new NodeId(key, NodeType.TYPE);

  public static NodeId newInstanceId(Key<?> key) {
    return new NodeId(key, NodeType.INSTANCE);

  public Key<?> getKey() {
    return key;

  @Override public int hashCode() {
    return Objects.hashCode(key, nodeType);

  @Override public boolean equals(Object obj) {
    if (obj == null || !(obj.getClass().equals(NodeId.class))) {
      return false;
    NodeId other = (NodeId) obj;
    return Objects.equal(key, other.key) && Objects.equal(nodeType, other.nodeType);

  @Override public String toString() {
    return "NodeId{nodeType=" + nodeType + " key=" + key + "}";

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