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/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFLength.java

#
Java | 53 lines | 27 code | 5 blank | 21 comment | 4 complexity | 621abbae632c96b601d46aa77cb2fcd8 MD5 | raw file
 1/**
 2 * Licensed to the Apache Software Foundation (ASF) under one
 3 * or more contributor license agreements.  See the NOTICE file
 4 * distributed with this work for additional information
 5 * regarding copyright ownership.  The ASF licenses this file
 6 * to you under the Apache License, Version 2.0 (the
 7 * "License"); you may not use this file except in compliance
 8 * with the License.  You may obtain a copy of the License at
 9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18package org.apache.hadoop.hive.ql.udf;
19
20import org.apache.hadoop.hive.ql.exec.Description;
21import org.apache.hadoop.hive.ql.exec.UDF;
22import org.apache.hadoop.hive.ql.udf.generic.GenericUDFUtils;
23import org.apache.hadoop.io.IntWritable;
24import org.apache.hadoop.io.Text;
25
26/**
27 * UDFLength.
28 *
29 */
30@Description(name = "length",
31    value = "_FUNC_(str) - Returns the length of str ",
32    extended = "Example:\n"
33    + "  > SELECT _FUNC_('Facebook') FROM src LIMIT 1;\n" + "  8")
34public class UDFLength extends UDF {
35  private final IntWritable result = new IntWritable();
36
37  public IntWritable evaluate(Text s) {
38    if (s == null) {
39      return null;
40    }
41
42    byte[] data = s.getBytes();
43    int len = 0;
44    for (int i = 0; i < s.getLength(); i++) {
45      if (GenericUDFUtils.isUtfStartByte(data[i])) {
46        len++;
47      }
48    }
49
50    result.set(len);
51    return result;
52  }
53}