geode-core/src/main/java/org/apache/geode/cache/query/internal/parse/ASTAggregateFunc.java

/*
 * 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.geode.cache.query.internal.parse;

import antlr.Token;

import org.apache.geode.cache.query.QueryInvalidException;
import org.apache.geode.cache.query.internal.CompiledValue;
import org.apache.geode.cache.query.internal.QCompiler;

public class ASTAggregateFunc extends GemFireAST {
  private static final long serialVersionUID = 8713004765228379685L;
  private int aggFunctionType;
  private boolean distinctOnly = false;


  public ASTAggregateFunc() {

  }


  public ASTAggregateFunc(Token t) {
    super(t);
  }

  public void setAggregateFunctionType(int type) {
    this.aggFunctionType = type;
  }

  public void setDistinctOnly(boolean distinctOnly) {
    this.distinctOnly = distinctOnly;
  }

  @Override
  public void compile(QCompiler compiler) {
    super.compile(compiler);
    Object expr = compiler.pop();
    if (expr instanceof String) {
      if (((String) expr).equals("*")) {
        expr = null;
      } else {
        throw new QueryInvalidException("invalid parameter to aggregate function");
      }
    }
    compiler.aggregateFunction((CompiledValue) expr, this.aggFunctionType, this.distinctOnly);
  }
}