org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFWeekOfYearString Maven / Gradle / Ivy
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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.exec.vector.expressions;
import org.apache.hadoop.io.Text;
import java.nio.charset.CharacterCodingException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* Expression to get week of year.
* Extends {@link VectorUDFTimestampFieldString}
*/
public final class VectorUDFWeekOfYearString extends VectorUDFTimestampFieldString {
private static final long serialVersionUID = 1L;
private transient final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
private transient final Calendar calendar = Calendar.getInstance();
public VectorUDFWeekOfYearString(int colNum, int outputColumn) {
super(colNum, outputColumn, -1, -1);
initCalendar();
}
public VectorUDFWeekOfYearString() {
super();
initCalendar();
}
@Override
protected long doGetField(byte[] bytes, int start, int length) throws ParseException {
Date date = null;
try {
String decoded = Text.decode(bytes, start, length);
date = format.parse(decoded);
} catch (CharacterCodingException e) {
throw new ParseException(e.getMessage(), 0);
}
calendar.setTime(date);
return calendar.get(Calendar.WEEK_OF_YEAR);
}
private void initCalendar() {
// code copied over from UDFWeekOfYear implementation
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setMinimalDaysInFirstWeek(4);
}
}