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.util.Collection;
  
  import com.alibaba.fastjson.annotation.JSONField;
  import com.alibaba.fastjson.util.FieldInfo;
  
  /**
   * @author wenshao<szujobs@hotmail.com>
   */
  public class ObjectFieldSerializer extends FieldSerializer {
  
      private ObjectSerializer fieldSerializer;
  
      private Class<?>         runtimeFieldClass;
      private String           format;
      private boolean          writeNumberAsZero       = false;
      boolean                  writeNullStringAsEmpty  = false;
      boolean                  writeNullBooleanAsFalse = false;
      boolean                  writeNullListAsEmpty    = false;
      boolean                  writeEnumUsingToString  = false;
  
      public ObjectFieldSerializer(FieldInfo fieldInfo){
          super(fieldInfo);
  
          JSONField annotation = fieldInfo.getAnnotation(JSONField.class);
  
          if (annotation != null) {
              format = annotation.format();
  
              if (format.trim().length() == 0) {
                  format = null;
              }
  
              for (SerializerFeature feature : annotation.serialzeFeatures()) {
                  if (feature == SerializerFeature.WriteNullNumberAsZero) {
                      writeNumberAsZero = true;
                  } else if (feature == SerializerFeature.WriteNullStringAsEmpty) {
                      writeNullStringAsEmpty = true;
                  } else if (feature == SerializerFeature.WriteNullBooleanAsFalse) {
                      writeNullBooleanAsFalse = true;
                  } else if (feature == SerializerFeature.WriteNullListAsEmpty) {
                      writeNullListAsEmpty = true;
                  } else if (feature == SerializerFeature.WriteEnumUsingToString) {
                      writeEnumUsingToString = true;
                  }
              }
          }
      }
  
      @Override
      public void writeProperty(JSONSerializer serializer, Object propertyValue) throws Exception {
          writePrefix(serializer);
  
          if (format != null) {
              serializer.writeWithFormat(propertyValue, format);
              return;
          }
  
          if (fieldSerializer == null) {
  
              if (propertyValue == null) {
                  runtimeFieldClass = this.getMethod().getReturnType();
              } else {
                  runtimeFieldClass = propertyValue.getClass();
              }
  
              fieldSerializer = serializer.getObjectWriter(runtimeFieldClass);
          }
  
          if (propertyValue == null) {
              if (writeNumberAsZero && Number.class.isAssignableFrom(runtimeFieldClass)) {
                  serializer.getWriter().write('0');
                  return;
              } else if (writeNullStringAsEmpty && String.class == runtimeFieldClass) {
                  serializer.getWriter().write("\"\"");
                  return;
              } else if (writeNullBooleanAsFalse && Boolean.class == runtimeFieldClass) {
                  serializer.getWriter().write("false");
                  return;
              } else if (writeNullListAsEmpty && Collection.class.isAssignableFrom(runtimeFieldClass)) {
                  serializer.getWriter().write("[]");
                  return;
              }
  
              fieldSerializer.write(serializer, null, fieldInfo.getName(), null);
              return;
          }
  
          if (writeEnumUsingToString == true && runtimeFieldClass.isEnum()) {
              serializer.getWriter().writeString(((Enum<?>) propertyValue).name());
              return;
          }
  
          Class<?> valueClass = propertyValue.getClass();
          if (valueClass == runtimeFieldClass) {
              fieldSerializer.write(serializer, propertyValue, fieldInfo.getName(), fieldInfo.getFieldType());
              return;
          }
  
          ObjectSerializer valueSerializer = serializer.getObjectWriter(valueClass);
          valueSerializer.write(serializer, propertyValue, fieldInfo.getName(), null);
      }
  
  }
  