| // Copyright 2009 The Apache Software Foundation |
| // |
| // 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 org.apache.tapestry5.internal.services; |
| |
| import org.apache.tapestry5.ioc.internal.util.CollectionFactory; |
| import org.apache.tapestry5.services.InvalidationListener; |
| |
| import java.util.Map; |
| |
| public class StringInternerImpl implements StringInterner, InvalidationListener |
| { |
| private final Map<String, String> cache = CollectionFactory.newConcurrentMap(); |
| |
| public void objectWasInvalidated() |
| { |
| cache.clear(); |
| } |
| |
| public String intern(String string) |
| { |
| String result = cache.get(string); |
| |
| // Not yet in the cache? Add it. |
| |
| if (result == null) |
| { |
| cache.put(string, string); |
| result = string; |
| } |
| |
| return result; |
| } |
| |
| public String format(String format, Object... arguments) |
| { |
| return intern(String.format(format, arguments)); |
| } |
| } |