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.math.BigDecimal;
  import java.util.concurrent.atomic.AtomicLong;
  
  import com.alibaba.fastjson.JSONException;
  import com.alibaba.fastjson.JSONObject;
  import com.alibaba.fastjson.parser.DefaultJSONParser;
  import com.alibaba.fastjson.parser.JSONLexer;
  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 LongCodec implements ObjectSerializer, ObjectDeserializer {
  
      public static LongCodec instance = new LongCodec();
  
      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.WriteNullNumberAsZero);
          } else {
              long value = ((Long) object).longValue();
              out.writeLong(value);
      
              if (out.isEnabled(SerializerFeature.WriteClassName) //
                  && value <= Integer.MAX_VALUE && value >= Integer.MIN_VALUE //
                  && fieldType != Long.class
                  && fieldType != long.class) {
                  out.write('L');
              }
          }
      }
      
      @SuppressWarnings("unchecked")
      public <T> T deserialze(DefaultJSONParser parser, Type clazz, Object fieldName) {
          final JSONLexer lexer = parser.lexer;
  
          Long longObject;
          try {
              final int token = lexer.token();
              if (token == JSONToken.LITERAL_INT) {
                  long longValue = lexer.longValue();
                  lexer.nextToken(JSONToken.COMMA);
                  longObject = Long.valueOf(longValue);
              } else if (token == JSONToken.LITERAL_FLOAT) {
                  BigDecimal number = lexer.decimalValue();
                  longObject = TypeUtils.longValue(number);
                  lexer.nextToken(JSONToken.COMMA);
              } else {
                  if (token == JSONToken.LBRACE) {
                      JSONObject jsonObject = new JSONObject(true);
                      parser.parseObject(jsonObject);
                      longObject = TypeUtils.castToLong(jsonObject);
                  } else {
                      Object value = parser.parse();
  
                      longObject = TypeUtils.castToLong(value);
                  }
                  if (longObject == null) {
                      return null;
                  }
              }
          } catch (Exception ex) {
              throw new JSONException("parseLong error, field : " + fieldName, ex);
          }
          
          return clazz == AtomicLong.class //
              ? (T) new AtomicLong(longObject.longValue()) //
              : (T) longObject;
      }
  
      public int getFastMatchToken() {
          return JSONToken.LITERAL_INT;
      }
  }
  