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.reflect.Type;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.TreeSet;
  
  import com.alibaba.fastjson.JSONArray;
  import com.alibaba.fastjson.parser.DefaultJSONParser;
  import com.alibaba.fastjson.parser.JSONToken;
  import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;
  import com.alibaba.fastjson.util.TypeUtils;
  
  /**
   * @author wenshao[szujobs@hotmail.com]
   */
  public class CollectionCodec implements ObjectSerializer, ObjectDeserializer {
  
      public final static CollectionCodec instance = new CollectionCodec();
  
      public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
          SerializeWriter out = serializer.out;
  
          if (object == null) {
              out.writeNull(SerializerFeature.WriteNullListAsEmpty);
              return;
          }
  
          Type elementType = null;
          if (out.isEnabled(SerializerFeature.WriteClassName)
                  || SerializerFeature.isEnabled(features, SerializerFeature.WriteClassName))
          {
              elementType = TypeUtils.getCollectionItemType(fieldType);
          }
  
          Collection<?> collection = (Collection<?>) object;
  
          SerialContext context = serializer.context;
          serializer.setContext(context, object, fieldName, 0);
  
          if (out.isEnabled(SerializerFeature.WriteClassName)) {
              if (HashSet.class.isAssignableFrom(collection.getClass())) {
                  out.append("Set");
              } else if (TreeSet.class == collection.getClass()) {
                  out.append("TreeSet");
              }
          }
  
          try {
              int i = 0;
              out.append('[');
              for (Object item : collection) {
  
                  if (i++ != 0) {
                      out.append(',');
                  }
  
                  if (item == null) {
                      out.writeNull();
                      continue;
                  }
  
                  Class<?> clazz = item.getClass();
  
                  if (clazz == Integer.class) {
                      out.writeInt(((Integer) item).intValue());
                      continue;
                  }
  
                  if (clazz == Long.class) {
                      out.writeLong(((Long) item).longValue());
  
                      if (out.isEnabled(SerializerFeature.WriteClassName)) {
                          out.write('L');
                      }
                      continue;
                  }
  
                  ObjectSerializer itemSerializer = serializer.getObjectWriter(clazz);
                  if (SerializerFeature.isEnabled(features, SerializerFeature.WriteClassName)
                          && itemSerializer instanceof JavaBeanSerializer) {
                      JavaBeanSerializer javaBeanSerializer = (JavaBeanSerializer) itemSerializer;
                      javaBeanSerializer.writeNoneASM(serializer, item, i - 1, elementType, features);
                  } else {
                      itemSerializer.write(serializer, item, i - 1, elementType, features);
                  }
              }
              out.append(']');
          } finally {
              serializer.context = context;
          }
      }
  
      @SuppressWarnings({ "unchecked", "rawtypes" })
      public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
          if (parser.lexer.token() == JSONToken.NULL) {
              parser.lexer.nextToken(JSONToken.COMMA);
              return null;
          }
          
          if (type == JSONArray.class) {
              JSONArray array = new JSONArray();
              parser.parseArray(array);
              return (T) array;
          }
  
          Collection list;
          if (parser.lexer.token() == JSONToken.SET) {
              parser.lexer.nextToken();
              list = TypeUtils.createSet(type);
          } else {
              list = TypeUtils.createCollection(type);
          }
  
          Type itemType = TypeUtils.getCollectionItemType(type);
          parser.parseArray(itemType, list, fieldName);
  
          return (T) list;
      }
  
    
  
      public int getFastMatchToken() {
          return JSONToken.LBRACKET;
      }
  }
  