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.input.filter;
  
  import org.apache.asterix.common.external.IExternalFilterEvaluator;
  import org.apache.asterix.formats.nontagged.BinaryBooleanInspector;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  
  class ExternalFilterEvaluator implements IExternalFilterEvaluator {
      private final IScalarEvaluator evaluator;
      private final IExternalFilterValueEvaluator[] valueEvaluators;
      private final VoidPointable booleanResult;
  
      ExternalFilterEvaluator(IScalarEvaluator evaluator, IExternalFilterValueEvaluator[] valueEvaluators) {
          this.evaluator = evaluator;
          this.valueEvaluators = valueEvaluators;
          booleanResult = new VoidPointable();
      }
  
      @Override
      public boolean isEmpty() {
          return valueEvaluators.length == 0;
      }
  
      @Override
      public boolean isComputedFieldUsed(int index) {
          return valueEvaluators[index] != NoOpExternalFilterValueEvaluator.INSTANCE;
      }
  
      @Override
      public void setValue(int index, String stringValue) throws HyracksDataException {
          valueEvaluators[index].setValue(stringValue);
      }
  
      @Override
      public boolean evaluate() throws HyracksDataException {
          evaluator.evaluate(null, booleanResult);
          return BinaryBooleanInspector.getBooleanValue(booleanResult.getByteArray(), booleanResult.getStartOffset(),
                  booleanResult.getLength());
      }
  }
  