com.google.inject.grapher.Node Maven / Gradle / Ivy
/**
* 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,
* 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.inject.grapher;
import com.google.common.base.Objects;
/**
* Node in a guice dependency graph.
*
* @author [email protected] (Bojan Djordjevic)
*/
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);
}