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.runtime.runningaggregates.std;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.ABoolean;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IWindowAggregateEvaluator;
  import org.apache.hyracks.api.dataflow.value.IBinaryComparator;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  public class WinMarkValidTuplesRunningAggregateEvaluator implements IWindowAggregateEvaluator {
  
      private final ISerializerDeserializer boolSerde =
              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ABOOLEAN);
  
      private final IScalarEvaluator[] args;
  
      private final IPointable[] argFirstValues;
  
      private final IPointable[] argCurrValues;
  
      private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
      private final DataOutput dataOutput = resultStorage.getDataOutput();
  
      private IBinaryComparator[] argComparators;
  
      protected boolean first;
  
      WinMarkValidTuplesRunningAggregateEvaluator(IScalarEvaluator[] args) {
          this.args = args;
          argFirstValues = argCurrValues = new IPointable[args.length];
          for (int i = 0; i < args.length; i++) {
              argFirstValues[i] = new ArrayBackedValueStorage();
              argCurrValues[i] = VoidPointable.FACTORY.createPointable();
          }
      }
  
      @Override
      public void configure(IBinaryComparator[] orderComparators) {
          argComparators = orderComparators;
      }
  
      @Override
      public void init() throws HyracksDataException {
      }
  
      @Override
      public void initPartition(long partitionLength) {
          first = true;
      }
  
      @Override
      public void step(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
          boolean value;
          if (first) {
              first = false;
              value = true;
              for (int i = 0; i < args.length; i++) {
                  args[i].evaluate(tuple, argFirstValues[i]);
              }
          } else {
              value = sameTuple(tuple);
          }
          resultStorage.reset();
          boolSerde.serialize(ABoolean.valueOf(value), dataOutput);
          result.set(resultStorage);
      }
  
      private boolean sameTuple(IFrameTupleReference tuple) throws HyracksDataException {
          for (int i = 0; i < args.length; i++) {
              IPointable v1 = argFirstValues[i];
              args[i].evaluate(tuple, argCurrValues[i]);
              IPointable v2 = argCurrValues[i];
              IBinaryComparator cmp = argComparators[i];
              if (cmp.compare(v1.getByteArray(), v1.getStartOffset(), v1.getLength(), v2.getByteArray(),
                      v2.getStartOffset(), v2.getLength()) != 0) {
                  return false;
              }
          }
          return true;
      }
  }