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   * 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.
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  package org.apache.asterix.optimizer.rules.cbo.indexadvisor;
  
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
  import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
  import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
  import org.apache.hyracks.algebricks.core.algebra.operators.logical.DataSourceScanOperator;
  
  public class AdvisorScanPlanNode extends AbstractAdvisorPlanNode {
      private ILogicalOperator op;
      private final DataSourceScanOperator scanOperator;
      private final ScanFilter filter;
  
      public AdvisorScanPlanNode(ILogicalOperator op, IOptimizationContext context) throws AlgebricksException {
          super(PlanNodeType.SCAN);
          this.op = op;
          this.scanOperator = findDatascanOperator(op);
          filter = AdvisorConditionParser.parseScanNode(op, context);
      }
  
      private DataSourceScanOperator findDatascanOperator(ILogicalOperator op) {
          while (op.getOperatorTag() != LogicalOperatorTag.DATASOURCESCAN) {
              op = op.getInputs().get(0).getValue();
          }
          return (DataSourceScanOperator) op;
      }
  
      public DataSourceScanOperator getScanOperator() {
          return scanOperator;
      }
  
      @Override
      public List<AdvisorScanPlanNode> getLeafs() {
          return Collections.singletonList(this);
      }
  
      @Override
      public List<AdvisorJoinPlanNode> getJoins() {
          return Collections.emptyList();
      }
  
      public ScanFilter getFilter() {
          return filter;
      }
  
  }
  