/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed 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 com.linkedin.pinot.pql.parsers.pql2.ast;

import com.linkedin.pinot.common.exception.QueryException;


/**
 * AST node for the TOP clause.
 */
public class TopAstNode extends BaseAstNode {
  private int _count;
  public static int DEFAULT_TOP_N = 50;

  public TopAstNode(int count) {
    if (count < 0) {
      throw new RuntimeException(QueryException.PQL_PARSING_ERROR);
    }
    if (count == 0) {
      _count = DEFAULT_TOP_N;
    } else {
      _count = count;
    }
  }

  public int getCount() {
    return _count;
  }

  @Override
  public String toString() {
    return "TopAstNode{" + "_count=" + _count + '}';
  }
}