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 java.util.Arrays;
  
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.evaluators.EvaluatorContext;
  import org.apache.hyracks.api.application.IServiceContext;
  import org.apache.hyracks.api.exceptions.IWarningCollector;
  
  class FilterEvaluatorContext extends EvaluatorContext {
      private final IExternalFilterValueEvaluator[] evaluators;
  
      public FilterEvaluatorContext(IServiceContext serviceContext, IWarningCollector warningCollector,
              IExternalFilterValueEvaluator[] evaluators) {
          super(serviceContext, warningCollector);
          this.evaluators = evaluators;
          Arrays.fill(evaluators, NoOpExternalFilterValueEvaluator.INSTANCE);
      }
  
      public IScalarEvaluator createEvaluator(int index, ATypeTag typeTag) {
          IExternalFilterValueEvaluator evaluator = evaluators[index];
          if (evaluator == NoOpExternalFilterValueEvaluator.INSTANCE) {
              evaluator = new ExternalFilterValueEvaluator(typeTag);
              evaluators[index] = evaluator;
          }
          return evaluator;
      }
  }
  