content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.csp.sentinel.cluster.server.codec.data;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import com.alibaba.csp.sentinel.cluster.ClusterConstants;
  import com.alibaba.csp.sentinel.cluster.codec.EntityDecoder;
  import com.alibaba.csp.sentinel.cluster.request.data.ParamFlowRequestData;
  
  import io.netty.buffer.ByteBuf;
  
  /**
   * @author jialiang.linjl
   * @author Eric Zhao
   * @since 1.4.0
   */
  public class ParamFlowRequestDataDecoder implements EntityDecoder<ByteBuf, ParamFlowRequestData> {
  
      @Override
      public ParamFlowRequestData decode(ByteBuf source) {
          if (source.readableBytes() >= 16) {
              ParamFlowRequestData requestData = new ParamFlowRequestData()
                  .setFlowId(source.readLong())
                  .setCount(source.readInt());
  
              int amount = source.readInt();
              if (amount > 0) {
                  List<Object> params = new ArrayList<>(amount);
                  for (int i = 0; i < amount; i++) {
                      decodeParam(source, params);
                  }
  
                  requestData.setParams(params);
                  return requestData;
              }
          }
          return null;
      }
  
      private boolean decodeParam(ByteBuf source, List<Object> params) {
          byte paramType = source.readByte();
  
          switch (paramType) {
              case ClusterConstants.PARAM_TYPE_INTEGER:
                  params.add(source.readInt());
                  return true;
              case ClusterConstants.PARAM_TYPE_STRING:
                  int length = source.readInt();
                  byte[] bytes = new byte[length];
                  source.readBytes(bytes);
                  // TODO: take care of charset?
                  params.add(new String(bytes));
                  return true;
              case ClusterConstants.PARAM_TYPE_BOOLEAN:
                  params.add(source.readBoolean());
                  return true;
              case ClusterConstants.PARAM_TYPE_DOUBLE:
                  params.add(source.readDouble());
                  return true;
              case ClusterConstants.PARAM_TYPE_LONG:
                  params.add(source.readLong());
                  return true;
              case ClusterConstants.PARAM_TYPE_FLOAT:
                  params.add(source.readFloat());
                  return true;
              case ClusterConstants.PARAM_TYPE_BYTE:
                  params.add(source.readByte());
                  return true;
              case ClusterConstants.PARAM_TYPE_SHORT:
                  params.add(source.readShort());
                  return true;
              default:
                  return false;
          }
      }
  }
  