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.lang.sqlpp.rewrites.visitor;
  
  import java.util.Collection;
  
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.lang.common.base.AbstractClause;
  import org.apache.asterix.lang.common.base.Expression;
  import org.apache.asterix.lang.common.clause.LetClause;
  import org.apache.asterix.lang.common.expression.AbstractCallExpression;
  import org.apache.asterix.lang.common.expression.ListSliceExpression;
  import org.apache.asterix.lang.common.struct.Identifier;
  import org.apache.asterix.lang.common.visitor.GatherFunctionCallsVisitor;
  import org.apache.asterix.lang.sqlpp.clause.AbstractBinaryCorrelateClause;
  import org.apache.asterix.lang.sqlpp.clause.FromClause;
  import org.apache.asterix.lang.sqlpp.clause.FromTerm;
  import org.apache.asterix.lang.sqlpp.clause.HavingClause;
  import org.apache.asterix.lang.sqlpp.clause.JoinClause;
  import org.apache.asterix.lang.sqlpp.clause.NestClause;
  import org.apache.asterix.lang.sqlpp.clause.Projection;
  import org.apache.asterix.lang.sqlpp.clause.SelectBlock;
  import org.apache.asterix.lang.sqlpp.clause.SelectClause;
  import org.apache.asterix.lang.sqlpp.clause.SelectElement;
  import org.apache.asterix.lang.sqlpp.clause.SelectRegular;
  import org.apache.asterix.lang.sqlpp.clause.SelectSetOperation;
  import org.apache.asterix.lang.sqlpp.clause.UnnestClause;
  import org.apache.asterix.lang.sqlpp.expression.CaseExpression;
  import org.apache.asterix.lang.sqlpp.expression.SelectExpression;
  import org.apache.asterix.lang.sqlpp.expression.WindowExpression;
  import org.apache.asterix.lang.sqlpp.struct.SetOperationRight;
  import org.apache.asterix.lang.sqlpp.visitor.base.ISqlppVisitor;
  import org.apache.hyracks.algebricks.common.utils.Pair;
  
  public final class SqlppGatherFunctionCallsVisitor extends GatherFunctionCallsVisitor
          implements ISqlppVisitor<Void, Void> {
  
      public SqlppGatherFunctionCallsVisitor(Collection<? super AbstractCallExpression> calls) {
          super(calls);
      }
  
      @Override
      public Void visit(FromClause fromClause, Void arg) throws CompilationException {
          for (FromTerm fromTerm : fromClause.getFromTerms()) {
              fromTerm.accept(this, arg);
          }
          return null;
      }
  
      @Override
      public Void visit(FromTerm fromTerm, Void arg) throws CompilationException {
          fromTerm.getLeftExpression().accept(this, arg);
          for (AbstractBinaryCorrelateClause correlateClause : fromTerm.getCorrelateClauses()) {
              correlateClause.accept(this, arg);
          }
          return null;
      }
  
      @Override
      public Void visit(JoinClause joinClause, Void arg) throws CompilationException {
          joinClause.getRightExpression().accept(this, arg);
          joinClause.getConditionExpression().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(NestClause nestClause, Void arg) throws CompilationException {
          nestClause.getRightExpression().accept(this, arg);
          nestClause.getConditionExpression().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(Projection projection, Void arg) throws CompilationException {
          return projection.hasExpression() ? projection.getExpression().accept(this, arg) : null;
      }
  
      @Override
      public Void visit(SelectBlock selectBlock, Void arg) throws CompilationException {
          if (selectBlock.hasFromClause()) {
              selectBlock.getFromClause().accept(this, arg);
          }
          if (selectBlock.hasLetWhereClauses()) {
              for (AbstractClause letWhereClause : selectBlock.getLetWhereList()) {
                  letWhereClause.accept(this, arg);
              }
          }
          if (selectBlock.hasGroupbyClause()) {
              selectBlock.getGroupbyClause().accept(this, arg);
          }
          if (selectBlock.hasLetHavingClausesAfterGroupby()) {
              for (AbstractClause letHavingClause : selectBlock.getLetHavingListAfterGroupby()) {
                  letHavingClause.accept(this, arg);
              }
          }
          selectBlock.getSelectClause().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(SelectClause selectClause, Void arg) throws CompilationException {
          if (selectClause.selectElement()) {
              selectClause.getSelectElement().accept(this, arg);
          } else {
              selectClause.getSelectRegular().accept(this, arg);
          }
          return null;
      }
  
      @Override
      public Void visit(SelectElement selectElement, Void arg) throws CompilationException {
          selectElement.getExpression().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(SelectRegular selectRegular, Void arg) throws CompilationException {
          for (Projection projection : selectRegular.getProjections()) {
              projection.accept(this, arg);
          }
          return null;
      }
  
      @Override
      public Void visit(SelectSetOperation selectSetOperation, Void arg) throws CompilationException {
          selectSetOperation.getLeftInput().accept(this, arg);
          for (SetOperationRight setOperationRight : selectSetOperation.getRightInputs()) {
              setOperationRight.getSetOperationRightInput().accept(this, arg);
          }
          return null;
      }
  
      @Override
      public Void visit(SelectExpression selectStatement, Void arg) throws CompilationException {
          if (selectStatement.hasLetClauses()) {
              for (LetClause letClause : selectStatement.getLetList()) {
                  letClause.accept(this, arg);
              }
          }
          selectStatement.getSelectSetOperation().accept(this, arg);
          if (selectStatement.hasOrderby()) {
              selectStatement.getOrderbyClause().accept(this, arg);
          }
          if (selectStatement.hasLimit()) {
              selectStatement.getLimitClause().accept(this, arg);
          }
          return null;
      }
  
      @Override
      public Void visit(UnnestClause unnestClause, Void arg) throws CompilationException {
          unnestClause.getRightExpression().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(HavingClause havingClause, Void arg) throws CompilationException {
          havingClause.getFilterExpression().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(CaseExpression caseExpression, Void arg) throws CompilationException {
          caseExpression.getConditionExpr().accept(this, arg);
          for (Expression expr : caseExpression.getWhenExprs()) {
              expr.accept(this, arg);
          }
          for (Expression expr : caseExpression.getThenExprs()) {
              expr.accept(this, arg);
          }
          caseExpression.getElseExpr().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(WindowExpression winExpr, Void arg) throws CompilationException {
          calls.add(winExpr);
          if (winExpr.hasPartitionList()) {
              for (Expression expr : winExpr.getPartitionList()) {
                  expr.accept(this, arg);
              }
          }
          if (winExpr.hasOrderByList()) {
              for (Expression expr : winExpr.getOrderbyList()) {
                  expr.accept(this, arg);
              }
          }
          if (winExpr.hasFrameStartExpr()) {
              winExpr.getFrameStartExpr().accept(this, arg);
          }
          if (winExpr.hasFrameEndExpr()) {
              winExpr.getFrameEndExpr().accept(this, arg);
          }
          if (winExpr.hasWindowFieldList()) {
              for (Pair<Expression, Identifier> p : winExpr.getWindowFieldList()) {
                  p.first.accept(this, arg);
              }
          }
          if (winExpr.hasAggregateFilterExpr()) {
              winExpr.getAggregateFilterExpr().accept(this, arg);
          }
          for (Expression expr : winExpr.getExprList()) {
              expr.accept(this, arg);
          }
          return null;
      }
  
      @Override
      public Void visit(ListSliceExpression expression, Void arg) throws CompilationException {
          expression.getExpr().accept(this, arg);
          expression.getStartIndexExpression().accept(this, arg);
  
          if (expression.hasEndExpression()) {
              expression.getEndIndexExpression().accept(this, arg);
          }
          return null;
      }
  }
  