114 lines
2.9 KiB
Java
114 lines
2.9 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* Defines a name that must be unique in the map that is provided during construction.
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*/
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public class UniqueName implements Comparable<UniqueName> {
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private static final AtomicInteger nextId = new AtomicInteger();
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private final int id;
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private final String name;
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/**
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* Constructs a new {@link UniqueName}
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*
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* @param map the map of names to compare with
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* @param name the name of this {@link UniqueName}
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* @param args the arguments to process
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*/
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public UniqueName(ConcurrentMap<String, Boolean> map, String name, Object... args) {
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if (map == null) {
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throw new NullPointerException("map");
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}
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if (name == null) {
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throw new NullPointerException("name");
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}
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if (args != null && args.length > 0) {
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validateArgs(args);
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}
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if (map.putIfAbsent(name, Boolean.TRUE) != null) {
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throw new IllegalArgumentException(String.format("'%s' is already in use", name));
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}
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id = nextId.incrementAndGet();
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this.name = name;
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}
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/**
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* Validates the given arguments. This method does not do anything on its own, but must be
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* overridden by its subclasses.
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*
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* @param args arguments to validate
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*/
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protected void validateArgs(Object... args) {
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// Subclasses will override.
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}
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/**
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* Returns this {@link UniqueName}'s name
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*
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* @return the name
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*/
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public final String name() {
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return name;
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}
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/**
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* Returns this {@link UniqueName}'s ID
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*
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* @return the id
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*/
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public final int id() {
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return id;
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}
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@Override
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public final int hashCode() {
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return super.hashCode();
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}
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@Override
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public final boolean equals(Object o) {
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return super.equals(o);
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}
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@Override
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public int compareTo(UniqueName other) {
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if (this == other) {
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return 0;
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}
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int returnCode = name.compareTo(other.name);
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if (returnCode != 0) {
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return returnCode;
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}
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return ((Integer) id).compareTo(other.id);
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}
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@Override
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public String toString() {
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return name();
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}
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}
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