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 java.util.List;
  
  import org.apache.asterix.common.external.IExternalFilterEvaluator;
  import org.apache.asterix.common.external.IExternalFilterEvaluatorFactory;
  import org.apache.asterix.external.input.filter.embedder.ExternalFilterValueEmbedder;
  import org.apache.asterix.external.input.filter.embedder.IExternalFilterValueEmbedder;
  import org.apache.asterix.external.util.ExternalDataPrefix;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.utils.ProjectionFiltrationTypeUtil;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.application.IServiceContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.exceptions.IWarningCollector;
  
  public class ExternalFilterEvaluatorFactory implements IExternalFilterEvaluatorFactory {
      private static final long serialVersionUID = -309935877927008746L;
      private final IScalarEvaluatorFactory filterEvalFactory;
      private final ARecordType allPaths;
      private final List<ProjectionFiltrationTypeUtil.RenamedType> leafs;
      private final ExternalDataPrefix prefix;
      private final boolean embedFilterValues;
  
      public ExternalFilterEvaluatorFactory(IScalarEvaluatorFactory filterEvalFactory, ARecordType allPaths,
              List<ProjectionFiltrationTypeUtil.RenamedType> leafs, ExternalDataPrefix prefix,
              boolean embedFilterValues) {
          this.filterEvalFactory = filterEvalFactory;
          this.allPaths = allPaths;
          this.leafs = leafs;
          this.prefix = prefix;
          this.embedFilterValues = embedFilterValues;
      }
  
      @Override
      public IExternalFilterEvaluator create(IServiceContext serviceContext, IWarningCollector warningCollector)
              throws HyracksDataException {
          if (filterEvalFactory == null) {
              return NoOpExternalFilterEvaluatorFactory.INSTANCE.create(serviceContext, warningCollector);
          }
  
          IExternalFilterValueEvaluator[] valueEvaluators = new IExternalFilterValueEvaluator[leafs.size()];
          Arrays.fill(valueEvaluators, NoOpExternalFilterValueEvaluator.INSTANCE);
          FilterEvaluatorContext filterContext =
                  new FilterEvaluatorContext(serviceContext, warningCollector, valueEvaluators);
          return new ExternalFilterEvaluator(filterEvalFactory.createScalarEvaluator(filterContext), valueEvaluators);
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public IExternalFilterValueEmbedder createValueEmbedder(IWarningCollector warningCollector) {
          if (embedFilterValues) {
              return new ExternalFilterValueEmbedder(allPaths, leafs, prefix);
          }
          return NoOpFilterValueEmbedder.INSTANCE;
      }
  }
  