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.BigInteger;
  
  import com.alibaba.fastjson.JSONException;
  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 BigIntegerCodec implements ObjectSerializer, ObjectDeserializer {
      private final static BigInteger LOW = BigInteger.valueOf(-9007199254740991L);
      private final static BigInteger HIGH = BigInteger.valueOf(9007199254740991L);
  
      public final static BigIntegerCodec instance = new BigIntegerCodec();
  
      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);
              return;
          }
          
          BigInteger val = (BigInteger) object;
          String str = val.toString();
          if (str.length() >= 16
                  && SerializerFeature.isEnabled(features, out.features, SerializerFeature.BrowserCompatible)
                  && (val.compareTo(LOW) < 0
                      || val.compareTo(HIGH) > 0))
          {
              out.writeString(str);
              return;
          }
          out.write(str);
      }
  
      @SuppressWarnings("unchecked")
      public <T> T deserialze(DefaultJSONParser parser, Type clazz, Object fieldName) {
          return (T) deserialze(parser);
      }
  
      @SuppressWarnings("unchecked")
      public static <T> T deserialze(DefaultJSONParser parser) {
          final JSONLexer lexer = parser.lexer;
          if (lexer.token() == JSONToken.LITERAL_INT) {
              String val = lexer.numberString();
              lexer.nextToken(JSONToken.COMMA);
  
              if (val.length() > 65535) {
                  throw new JSONException("decimal overflow");
              }
  
              return (T) new BigInteger(val);
          }
  
          Object value = parser.parse();
          return value == null //
              ? null //
              : (T) TypeUtils.castToBigInteger(value);
      }
  
      public int getFastMatchToken() {
          return JSONToken.LITERAL_INT;
      }
  }
  