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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.io.IntWritable;
import  org.apache.hadoop.io.Text;

UDFLpad.
@Description(name = "lpad",
    value = "_FUNC_(str, len, pad) - Returns str, left-padded with pad to a length of len",
    extended = "If str is longer than len, the return value is shortened to "
    + "len characters.\n"
    + "Example:\n"
    + "  > SELECT _FUNC_('hi', 5, '??') FROM src LIMIT 1;\n"
    + "  '???hi'"
    + "  > SELECT _FUNC_('hi', 1, '??') FROM src LIMIT 1;\n" + "  'h'")
public class UDFLpad extends UDF {
  private final Text result = new Text();
  public Text evaluate(Text s, IntWritable n, Text pad) {
    if (s == null || n == null || pad == null) {
      return null;
    }
    int len = n.get();
    byte[] data = .getBytes();
    if (data.length < len) {
      data = new byte[len];
    }
    byte[] txt = s.getBytes();
    byte[] padTxt = pad.getBytes();
    // The length of the padding needed
    int pos = Math.max(len - s.getLength(), 0);
    // Copy the padding
    for (int i = 0; i < posi += pad.getLength()) {
      for (int j = 0; j < pad.getLength() && j < pos - ij++) {
        data[i + j] = padTxt[j];
      }
    }
    // Copy the text
    for (int i = 0; pos + i < len && i < s.getLength(); i++) {
      data[pos + i] = txt[i];
    }
    .set(data, 0, len);
    return ;
  }
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