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 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 BigDecimalCodec implements ObjectSerializer, ObjectDeserializer {
      final static BigDecimal LOW = BigDecimal.valueOf(-9007199254740991L);
      final static BigDecimal HIGH = BigDecimal.valueOf(9007199254740991L);
  
      public final static BigDecimalCodec instance = new BigDecimalCodec();
  
      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 {
              BigDecimal val = (BigDecimal) object;
              int scale = val.scale();
  
              String outText;
              if (SerializerFeature.isEnabled(features, out.features, SerializerFeature.WriteBigDecimalAsPlain)
                      && scale >= -100 && scale < 100) {
                  outText = val.toPlainString();
              } else {
                  outText = val.toString();
              }
  
              if (scale == 0) {
                  if (outText.length() >= 16
                          && SerializerFeature.isEnabled(features, out.features, SerializerFeature.BrowserCompatible)
                          && (val.compareTo(LOW) < 0
                          || val.compareTo(HIGH) > 0))
                  {
                      out.writeString(outText);
                      return;
                  }
              }
  
              out.write(outText);
  
              if (out.isEnabled(SerializerFeature.WriteClassName) && fieldType != BigDecimal.class && val.scale() == 0) {
                  out.write('.');
              }
          }
      }
  
      @SuppressWarnings("unchecked")
      public <T> T deserialze(DefaultJSONParser parser, Type clazz, Object fieldName) {
          try {
              return (T) deserialze(parser);
          } catch (Exception ex) {
              throw new JSONException("parseDecimal error, field : " + fieldName, ex);
          }
      }
  
      @SuppressWarnings("unchecked")
      public static <T> T deserialze(DefaultJSONParser parser) {
          final JSONLexer lexer = parser.lexer;
          if (lexer.token() == JSONToken.LITERAL_INT) {
              BigDecimal decimalValue = lexer.decimalValue();
              lexer.nextToken(JSONToken.COMMA);
              return (T) decimalValue;
          }
  
          if (lexer.token() == JSONToken.LITERAL_FLOAT) {
              BigDecimal val = lexer.decimalValue();
              lexer.nextToken(JSONToken.COMMA);
              return (T) val;
          }
  
          Object value = parser.parse();
          return value == null //
              ? null //
              : (T) TypeUtils.castToBigDecimal(value);
      }
  
      public int getFastMatchToken() {
          return JSONToken.LITERAL_INT;
      }
  }
  