/*
 * 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 com.intel.ssg.dcst.panthera.parse.sql.generator;

import org.antlr.runtime.tree.CommonTree;
import org.apache.hadoop.hive.ql.parse.ASTNode;
import org.apache.hadoop.hive.ql.parse.HiveParser;

import com.intel.ssg.dcst.panthera.parse.sql.SqlXlateException;
import com.intel.ssg.dcst.panthera.parse.sql.SqlXlateUtil;
import com.intel.ssg.dcst.panthera.parse.sql.TranslateContext;

public class AsteriskGenerator extends BaseHiveASTGenerator {

  @Override
  public boolean generate(ASTNode hiveRoot, CommonTree sqlRoot, ASTNode currentHiveNode,
      CommonTree currentSqlNode, TranslateContext context) throws SqlXlateException {
    if (currentSqlNode.getChildCount() > 0) {
      //
      // If * has any child, it must be a multiplication operator with two children.
      //
      assert (currentSqlNode.getChildCount() == 2);
      ASTNode ret = SqlXlateUtil.newASTNode(HiveParser.STAR, "*");
      currentHiveNode.addChild(ret);
      return generateChildren(hiveRoot, sqlRoot, ret, currentSqlNode, context);
    } else {
      ASTNode ret = super.buildAllColRef();
      currentHiveNode.addChild(ret);
      return true;
    }
  }

}
