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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.udf;

import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.Text;

/**
 * UDFLower.
 *
 */
@Description(name = "lower,lcase",
    value = "_FUNC_(str) - Returns str with all characters changed to lowercase",
    extended = "Example:\n"
    + "  > SELECT _FUNC_('Facebook') FROM src LIMIT 1;\n" + "  'facebook'")
public class UDFLower extends UDF {
  private Text t = new Text();

  public UDFLower() {
  }

  public Text evaluate(Text s) {
    if (s == null) {
      return null;
    }
    t.set(s.toString().toLowerCase());
    return t;
  }

}