io.netty.util.AbstractConstant Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.util;
import java.util.concurrent.atomic.AtomicLong;
/**
* Base implementation of {@link Constant}.
*/
public abstract class AbstractConstant> implements Constant {
private static final AtomicLong uniqueIdGenerator = new AtomicLong();
private final int id;
private final String name;
private final long uniquifier;
/**
* Creates a new instance.
*/
protected AbstractConstant(int id, String name) {
this.id = id;
this.name = name;
this.uniquifier = uniqueIdGenerator.getAndIncrement();
}
@Override
public final String name() {
return name;
}
@Override
public final int id() {
return id;
}
@Override
public final String toString() {
return name();
}
@Override
public final int hashCode() {
return super.hashCode();
}
@Override
public final boolean equals(Object obj) {
return super.equals(obj);
}
@Override
public final int compareTo(T o) {
if (this == o) {
return 0;
}
@SuppressWarnings("UnnecessaryLocalVariable")
AbstractConstant other = o;
int returnCode;
returnCode = hashCode() - other.hashCode();
if (returnCode != 0) {
return returnCode;
}
if (uniquifier < other.uniquifier) {
return -1;
}
if (uniquifier > other.uniquifier) {
return 1;
}
throw new Error("failed to compare two different constants");
}
}