content: package com.alibaba.fastjson2.writer;
  
  import com.alibaba.fastjson2.JSONB;
  import com.alibaba.fastjson2.JSONWriter;
  import com.alibaba.fastjson2.util.Fnv;
  
  import java.lang.reflect.Type;
  import java.text.DecimalFormat;
  import java.util.function.Function;
  
  final class ObjectWriterImplDoubleValueArray
          extends ObjectWriterPrimitiveImpl {
      static final ObjectWriterImplDoubleValueArray INSTANCE = new ObjectWriterImplDoubleValueArray(null);
      static final byte[] JSONB_TYPE_NAME_BYTES = JSONB.toBytes("[D");
      static final long JSONB_TYPE_HASH = Fnv.hashCode64("[D");
  
      final DecimalFormat format;
  
      private final Function<Object, double[]> function;
  
      public ObjectWriterImplDoubleValueArray(DecimalFormat format) {
          this.format = format;
          this.function = null;
      }
  
      public ObjectWriterImplDoubleValueArray(Function<Object, double[]> function, DecimalFormat format) {
          this.function = function;
          this.format = format;
      }
  
      @Override
      public void writeJSONB(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
          if (jsonWriter.isWriteTypeInfo(object, fieldType)) {
              jsonWriter.writeTypeName(JSONB_TYPE_NAME_BYTES, JSONB_TYPE_HASH);
          }
  
          double[] array;
          if (function != null && object != null) {
              array = function.apply(object);
          } else {
              array = (double[]) object;
          }
          jsonWriter.writeDouble(array);
      }
  
      @Override
      public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
          double[] array;
          if (function != null && object != null) {
              array = function.apply(object);
          } else {
              array = (double[]) object;
          }
  
          if (format == null) {
              jsonWriter.writeDouble(array);
          } else {
              jsonWriter.writeDouble(array, format);
          }
      }
  }
  