org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFWeekOfYearString Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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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");
public VectorUDFWeekOfYearString(int colNum, int outputColumnNum) {
super(colNum, outputColumnNum, -1, -1);
}
public VectorUDFWeekOfYearString() {
super();
}
@Override
public void initCalendar() {
// code copied over from UDFWeekOfYear implementation
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setMinimalDaysInFirstWeek(4);
}
@Override
protected long getField(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);
}
}