content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.asterix.external.dataflow;
  
  import org.apache.asterix.external.api.IStreamDataParser;
  import org.apache.hyracks.api.comm.IFrameWriter;
  import org.apache.hyracks.api.context.IHyracksTaskContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
  import org.apache.hyracks.dataflow.common.comm.io.ArrayTupleReference;
  import org.apache.hyracks.storage.am.common.api.ITupleFilter;
  import org.apache.hyracks.storage.am.common.tuples.ReferenceFrameTupleReference;
  
  public class StreamDataFlowController extends AbstractDataFlowController {
      private final IStreamDataParser dataParser;
  
      public StreamDataFlowController(IHyracksTaskContext ctx, IStreamDataParser dataParser) {
          super(ctx);
          this.dataParser = dataParser;
      }
  
      @Override
      public void start(IFrameWriter writer, ITupleFilter tupleFilter, long outputLimit) throws HyracksDataException {
          try {
              processedTuples = 0;
              ArrayTupleBuilder tb = new ArrayTupleBuilder(1);
              boolean tupleFilterExists = tupleFilter != null;
              ArrayTupleReference tupleRef = tupleFilterExists ? new ArrayTupleReference() : null;
              ReferenceFrameTupleReference frameTupleRef = tupleFilterExists ? new ReferenceFrameTupleReference() : null;
              TupleForwarder tupleForwarder = new TupleForwarder(ctx, writer);
              while (outputLimit < 0 || processedTuples < outputLimit) {
                  tb.reset();
                  if (!dataParser.parse(tb.getDataOutput())) {
                      break;
                  }
                  tb.addFieldEndOffset();
  
                  if (tupleFilterExists) {
                      tupleRef.reset(tb.getFieldEndOffsets(), tb.getByteArray());
                      frameTupleRef.reset(tupleRef);
                      if (!tupleFilter.accept(frameTupleRef)) {
                          continue;
                      }
                  }
  
                  tupleForwarder.addTuple(tb);
                  processedTuples++;
              }
              tupleForwarder.complete();
          } catch (Exception e) {
              throw HyracksDataException.create(e);
          }
      }
  }
  