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.optimizer.rules.cbo;
  
  import org.apache.commons.lang3.mutable.Mutable;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
  import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
  import org.apache.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
  
  public class ContainsExpressionVisitor implements ILogicalExpressionReferenceTransform {
      private ILogicalExpression expr;
  
      protected void setExpression(ILogicalExpression expr) {
          this.expr = expr;
      }
  
      @Override
      public boolean transform(Mutable<ILogicalExpression> exprRef) throws AlgebricksException {
          ILogicalExpression expression = exprRef.getValue();
          boolean result = expr.equals(expression);
  
          if (!result && expression.getExpressionTag() == LogicalExpressionTag.FUNCTION_CALL) {
              AbstractFunctionCallExpression funcExpr = (AbstractFunctionCallExpression) expression;
              for (Mutable<ILogicalExpression> arg : funcExpr.getArguments()) {
                  if (transform(arg)) {
                      return true;
                  }
              }
          }
  
          return result;
      }
  }