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/**
 * 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.hadoop.hive.ql.parse;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

public class ColumnAccessInfo {
  /**
   * Map of table name to names of accessed columns
   */
  private final Map> tableToColumnAccessMap;

  public ColumnAccessInfo() {
    tableToColumnAccessMap = new HashMap>();
  }

  public void add(String table, String col) {
    Set tableColumns = tableToColumnAccessMap.get(table);
    if (tableColumns == null) {
      tableColumns = new HashSet();
      tableToColumnAccessMap.put(table, tableColumns);
    }
    tableColumns.add(col);
  }

  public Map> getTableToColumnAccessMap() {
    return tableToColumnAccessMap;
  }
}