/*

  * 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.johnzon.mapper.converter;

 import org.apache.johnzon.mapper.Converter;

 import java.util.concurrent.ConcurrentHashMap;

 import java.util.concurrent.ConcurrentMap;

 public class CachedDelegateConverter<T> implements Converter<T> {

     private final ConcurrentMap<T, String> strings = new ConcurrentHashMap<T, String>();

     private final ConcurrentMap<String, T> values = new ConcurrentHashMap<String, T>();

     private final Converter<T> delegate;

     public CachedDelegateConverter(final Converter<T> delegate) {

         this.delegate = delegate;

     }

     @Override

     public String toString(final T instance) {

         String v = strings.get(instance);

         if (v == null) {

             v = delegate.toString(instance);

             strings.putIfAbsent(instance, v);

         }

         return v;

     }

     @Override

     public T fromString(final String text) {

         T v = values.get(text);

         if (v == null) {

             v = delegate.fromString(text);

             values.putIfAbsent(text, v);

         }

         return v;

     }

 }