content: package com.alibaba.fastjson2.support.spring.http.codec;
  
  import com.alibaba.fastjson2.JSON;
  import com.alibaba.fastjson2.JSONException;
  import com.alibaba.fastjson2.support.config.FastJsonConfig;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import org.reactivestreams.Publisher;
  import org.springframework.core.ResolvableType;
  import org.springframework.core.codec.DecodingException;
  import org.springframework.core.codec.Hints;
  import org.springframework.core.io.buffer.DataBuffer;
  import org.springframework.core.io.buffer.DataBufferUtils;
  import org.springframework.core.log.LogFormatUtils;
  import org.springframework.http.codec.json.AbstractJackson2Decoder;
  import org.springframework.lang.NonNull;
  import org.springframework.lang.Nullable;
  import org.springframework.util.MimeType;
  import reactor.core.publisher.Flux;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Map;
  
  /**
   * Fastjson2 for Spring WebFlux.
   *
   * @author Xi.Liu
   * @see AbstractJackson2Decoder
   * @deprecated in favor of {@link com.alibaba.fastjson2.support.spring.codec.Fastjson2Encoder} and {@link com.alibaba.fastjson2.support.spring.codec.Fastjson2Decoder}
   */
  @Deprecated
  public class Fastjson2Decoder
          extends AbstractJackson2Decoder {
      private final FastJsonConfig config;
  
      public Fastjson2Decoder(ObjectMapper mapper, MimeType... mimeTypes) {
          super(mapper, mimeTypes);
          this.config = new FastJsonConfig();
      }
  
      public Fastjson2Decoder(ObjectMapper mapper, FastJsonConfig config, MimeType... mimeTypes) {
          super(mapper, mimeTypes);
          this.config = config;
      }
  
      @NonNull
      @Override
      public Flux<Object> decode(@NonNull Publisher<DataBuffer> input,
                                 @NonNull ResolvableType elementType,
                                 MimeType mimeType,
                                 Map<String, Object> hints) {
          throw new UnsupportedOperationException("Does not support stream decoding yet");
      }
  
      @Override
      public Object decode(@NonNull DataBuffer dataBuffer,
                           @NonNull ResolvableType targetType,
                           MimeType mimeType,
                           Map<String, Object> hints) throws DecodingException {
          try (ByteArrayOutputStream os = new ByteArrayOutputStream();
                  InputStream in = dataBuffer.asInputStream()) {
              byte[] buf = new byte[1 << 16];
              for (; ; ) {
                  int len = in.read(buf);
                  if (len == -1) {
                      break;
                  }
                  if (len > 0) {
                      os.write(buf, 0, len);
                  }
              }
              Object value = JSON.parseObject(os.toByteArray(),
                      targetType.getType(),
                      this.config.getDateFormat(),
                      this.config.getReaderFilters(),
                      this.config.getReaderFeatures());
              logValue(value, hints);
              return value;
          } catch (JSONException ex) {
              throw new DecodingException("JSON parse error: " + ex.getMessage(), ex);
          } catch (IOException ex) {
              throw new DecodingException("I/O error while reading input message", ex);
          } finally {
              DataBufferUtils.release(dataBuffer);
          }
      }
  
      private void logValue(@Nullable Object value,
                            @Nullable Map<String, Object> hints) {
          if (!Hints.isLoggingSuppressed(hints)) {
              LogFormatUtils.traceDebug(logger, traceOn -> {
                  String formatted = LogFormatUtils.formatValue(value, !traceOn);
                  return Hints.getLogPrefix(hints) + "Decoded [" + formatted + "]";
              });
          }
      }
  }
  