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 org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.common.functions.FunctionSignature;
  import org.apache.asterix.lang.common.base.Expression;
  import org.apache.asterix.lang.common.base.ILangExpression;
  import org.apache.asterix.lang.common.expression.CallExpr;
  import org.apache.asterix.lang.sqlpp.expression.WindowExpression;
  import org.apache.asterix.lang.sqlpp.util.FunctionMapUtil;
  import org.apache.asterix.lang.sqlpp.visitor.base.AbstractSqlppSimpleExpressionVisitor;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.api.exceptions.SourceLocation;
  
  public final class SqlppSpecialFunctionNameRewriteVisitor extends AbstractSqlppSimpleExpressionVisitor {
  
      @Override
      public Expression visit(CallExpr callExpr, ILangExpression arg) throws CompilationException {
          callExpr.setFunctionSignature(
                  rewriteCoreAggregateFunction(callExpr.getFunctionSignature(), callExpr.getSourceLocation()));
          return super.visit(callExpr, arg);
      }
  
      @Override
      public Expression visit(WindowExpression winExpr, ILangExpression arg) throws CompilationException {
          winExpr.setFunctionSignature(
                  rewriteCoreAggregateFunction(winExpr.getFunctionSignature(), winExpr.getSourceLocation()));
          return super.visit(winExpr, arg);
      }
  
      private static FunctionSignature rewriteCoreAggregateFunction(FunctionSignature fs, SourceLocation sourceLoc)
              throws CompilationException {
          FunctionIdentifier coreAggregate = FunctionMapUtil.findInternalCoreAggregateFunction(fs);
          if (coreAggregate != null) {
              return FunctionSignature.newAsterix(coreAggregate.getName(), fs.getArity());
          }
          if (FunctionMapUtil.isSql92AggregateFunction(fs)) {
              throw new CompilationException(ErrorCode.COMPILATION_ERROR, sourceLoc,
                      fs.getName() + " is a SQL-92 aggregate function. The SQL++ core aggregate function "
                              + FunctionMapUtil.sql92ToCoreAggregateFunction(fs).getName()
                              + " could potentially express the intent.");
          }
          if (FunctionMapUtil.getInternalWindowFunction(fs) != null) {
              throw new CompilationException(ErrorCode.COMPILATION_UNEXPECTED_WINDOW_EXPRESSION, sourceLoc);
          }
          return fs;
      }
  }
  