| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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 org.apache.qpid.server.protocol.v1_0.type; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| public final class Symbol implements Comparable<Symbol>, CharSequence |
| { |
| private final String _underlying; |
| private static final ConcurrentMap<String, Symbol> _symbols = new ConcurrentHashMap<String, Symbol>(2048); |
| |
| private Symbol(String underlying) |
| { |
| _underlying = underlying; |
| } |
| |
| public int length() |
| { |
| return _underlying.length(); |
| } |
| |
| public int compareTo(Symbol o) |
| { |
| return _underlying.compareTo(o._underlying); |
| } |
| |
| public char charAt(int index) |
| { |
| return _underlying.charAt(index); |
| } |
| |
| public CharSequence subSequence(int beginIndex, int endIndex) |
| { |
| return _underlying.subSequence(beginIndex, endIndex); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return _underlying; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return _underlying.hashCode(); |
| } |
| |
| public static Symbol valueOf(String symbolVal) |
| { |
| return getSymbol(symbolVal); |
| } |
| |
| public static Symbol getSymbol(String symbolVal) |
| { |
| if(symbolVal == null) |
| { |
| return null; |
| } |
| Symbol symbol = _symbols.get(symbolVal); |
| if(symbol == null) |
| { |
| symbolVal = symbolVal.intern(); |
| symbol = new Symbol(symbolVal); |
| Symbol existing; |
| if((existing = _symbols.putIfAbsent(symbolVal, symbol)) != null) |
| { |
| symbol = existing; |
| } |
| } |
| return symbol; |
| } |
| |
| |
| } |