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.ATypeTag;
  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.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.TaggedValuePointable;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  public final class WinMarkFirstUnknownRunningAggregateEvaluator implements IWindowAggregateEvaluator {
  
      @SuppressWarnings({ "rawtypes" })
      private final ISerializerDeserializer boolSerde =
              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ABOOLEAN);
  
      private final IScalarEvaluator[] argEvals;
  
      private final byte unknownTypeTag;
  
      private final TaggedValuePointable argValue;
  
      private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
  
      private final DataOutput dataOutput = resultStorage.getDataOutput();
  
      private boolean first;
  
      private boolean firstAllUnknown;
  
      WinMarkFirstUnknownRunningAggregateEvaluator(ATypeTag unknownTypeTag, IScalarEvaluator[] argEvals) {
          this.argEvals = argEvals;
          this.unknownTypeTag = unknownTypeTag.serialize();
          argValue = TaggedValuePointable.FACTORY.createPointable();
      }
  
      @Override
      public void init() {
      }
  
      @Override
      public void initPartition(long partitionLength) {
          first = true;
      }
  
      @Override
      public void step(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
          boolean value = compute(tuple);
          resultStorage.reset();
          boolSerde.serialize(ABoolean.valueOf(value), dataOutput);
          result.set(resultStorage);
      }
  
      private boolean compute(IFrameTupleReference tuple) throws HyracksDataException {
          if (first) {
              firstAllUnknown = everyArgIsUnknown(tuple);
              first = false;
              return true;
          } else {
              boolean thisAllMissing = firstAllUnknown || everyArgIsUnknown(tuple);
              return !thisAllMissing;
          }
      }
  
      private boolean everyArgIsUnknown(IFrameTupleReference tuple) throws HyracksDataException {
          for (IScalarEvaluator argEval : argEvals) {
              argEval.evaluate(tuple, argValue);
              if (argValue.getTag() != unknownTypeTag) {
                  return false;
              }
          }
          return true;
      }
  }
  