content: /*
   * Copyright 1999-2101 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.ParameterizedType;
  import java.lang.reflect.Type;
  import java.util.List;
  
  /**
   * @author wenshao<szujobs@hotmail.com>
   */
  public final class ListSerializer implements ObjectSerializer {
  
      public static final ListSerializer instance = new ListSerializer();
  
      public final void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType)
                                                                                                         throws IOException {
          
          boolean writeClassName = serializer.isEnabled(SerializerFeature.WriteClassName);
          
          SerializeWriter out = serializer.getWriter();
  
          Type elementType = null;
          if (writeClassName) {
              if (fieldType instanceof ParameterizedType) {
                  ParameterizedType param = (ParameterizedType) fieldType;
                  elementType = param.getActualTypeArguments()[0];
              }
          }
  
          if (object == null) {
              if (out.isEnabled(SerializerFeature.WriteNullListAsEmpty)) {
                  out.write("[]");
              } else {
                  out.writeNull();
              }
              return;
          }
  
          List<?> list = (List<?>) object;
  
          final int size = list.size();
          int end = size - 1;
  
          if (end == -1) {
              out.append("[]");
              return;
          }
  
          SerialContext context = serializer.getContext();
          serializer.setContext(context, object, fieldName);
  
          ObjectSerializer itemSerializer = null;
          try {
              if (size > 1 && out.isEnabled(SerializerFeature.PrettyFormat)) {
                  out.append('[');
                  serializer.incrementIndent();
                  for (int i = 0; i < size; ++i) {
                      if (i != 0) {
                          out.append(',');
                      }
  
                      serializer.println();
                      Object item = list.get(i);
  
                      if (item != null) {
                          if (serializer.containsReference(item)) {
                              serializer.writeReference(item);
                          } else {
                              itemSerializer = serializer.getObjectWriter(item.getClass());
                              SerialContext itemContext = new SerialContext(context, object, fieldName);
                              serializer.setContext(itemContext);
                              itemSerializer.write(serializer, item, i, elementType);
                          }
                      } else {
                          serializer.getWriter().writeNull();
                      }
                  }
                  serializer.decrementIdent();
                  serializer.println();
                  out.append(']');
                  return;
              }
  
              out.append('[');
              for (int i = 0; i < end; ++i) {
                  Object item = list.get(i);
  
                  if (item == null) {
                      out.append("null,");
                  } else {
                      Class<?> clazz = item.getClass();
  
                      if (clazz == Integer.class) {
                          out.writeIntAndChar(((Integer) item).intValue(), ',');
                      } else if (clazz == Long.class) {
                          long val = ((Long) item).longValue();
                          if (writeClassName) {
                              out.writeLongAndChar(val, 'L');
                              out.write(',');
                          } else {
                              out.writeLongAndChar(val, ',');                            
                          }
                      } else {
                          SerialContext itemContext = new SerialContext(context, object, fieldName);
                          serializer.setContext(itemContext);
  
                          if (serializer.containsReference(item)) {
                              serializer.writeReference(item);
                          } else {
                              itemSerializer = serializer.getObjectWriter(item.getClass());
                              itemSerializer.write(serializer, item, i, elementType);
                          }
  
                          out.append(',');
                      }
                  }
              }
  
              Object item = list.get(end);
  
              if (item == null) {
                  out.append("null]");
              } else {
                  Class<?> clazz = item.getClass();
  
                  if (clazz == Integer.class) {
                      out.writeIntAndChar(((Integer) item).intValue(), ']');
                  } else if (clazz == Long.class) {
                      if (writeClassName) {
                          out.writeLongAndChar(((Long) item).longValue(), 'L');
                          out.write(']');
                      } else {
                          out.writeLongAndChar(((Long) item).longValue(), ']');                            
                      }
                  } else {
                      SerialContext itemContext = new SerialContext(context, object, fieldName);
                      serializer.setContext(itemContext);
  
                      if (serializer.containsReference(item)) {
                          serializer.writeReference(item);
                      } else {
                          itemSerializer = serializer.getObjectWriter(item.getClass());
                          itemSerializer.write(serializer, item, end, elementType);
                      }
                      out.append(']');
                  }
              }
          } finally {
              serializer.setContext(context);
          }
      }
  
  }
  