content: /*
   * Copyright 1999-2018 Alibaba Group.
   *
   * 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 com.alibaba.fastjson.serializer;
  
  import java.io.IOException;
  import java.lang.ref.Reference;
  import java.lang.ref.SoftReference;
  import java.lang.ref.WeakReference;
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  import java.util.concurrent.atomic.AtomicReference;
  
  import com.alibaba.fastjson.parser.DefaultJSONParser;
  import com.alibaba.fastjson.parser.JSONToken;
  import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;
  
  /**
   * @author wenshao[szujobs@hotmail.com]
   */
  public class ReferenceCodec implements ObjectSerializer, ObjectDeserializer {
  
      public final static ReferenceCodec instance = new ReferenceCodec();
  
      @SuppressWarnings("rawtypes")
      public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
          Object item;
          if (object instanceof AtomicReference) {
              AtomicReference val = (AtomicReference) object;
              item = val.get();
          } else {
              item = ((Reference) object).get();
          }
          serializer.write(item);
      }
  
      @SuppressWarnings({ "unchecked", "rawtypes" })
      public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
          ParameterizedType paramType = (ParameterizedType) type;
          Type itemType = paramType.getActualTypeArguments()[0];
  
          Object itemObject = parser.parseObject(itemType);
  
          Type rawType = paramType.getRawType();
          if (rawType == AtomicReference.class) {
              return (T) new AtomicReference(itemObject);
          }
  
          if (rawType == WeakReference.class) {
              return (T) new WeakReference(itemObject);
          }
  
          if (rawType == SoftReference.class) {
              return (T) new SoftReference(itemObject);
          }
  
          throw new UnsupportedOperationException(rawType.toString());
      }
  
      public int getFastMatchToken() {
          return JSONToken.LBRACE;
      }
  }
  