/**
* 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.generic;
import static org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils.PrimitiveGrouping.DATE_GROUP;
import static org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils.PrimitiveGrouping.STRING_GROUP;
import static org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils.PrimitiveGrouping.VOID_GROUP;
import java.util.Calendar;
import java.util.Date;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Converter;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.IntWritable;
/**
* GenericUDFQuarter.
*
* Returns the quarter of the year for date, in the range 1 to 4.
*
*/
@Description(name = "quarter", value = "_FUNC_(date/timestamp/string) - Returns the "
+ "quarter of the year for date, in the range 1 to 4.",
extended = "Example: > SELECT _FUNC_('2015-04-08');\n 2")
public class GenericUDFQuarter extends GenericUDF {
private transient Converter[] converters = new Converter[1];
private transient PrimitiveCategory[] inputTypes = new PrimitiveCategory[1];
private final Calendar calendar = Calendar.getInstance();
private final IntWritable output = new IntWritable();
@Override
public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
checkArgsSize(arguments, 1, 1);
checkArgPrimitive(arguments, 0);
checkArgGroups(arguments, 0, inputTypes, STRING_GROUP, DATE_GROUP, VOID_GROUP);
obtainDateConverter(arguments, 0, inputTypes, converters);
ObjectInspector outputOI = PrimitiveObjectInspectorFactory.writableIntObjectInspector;
return outputOI;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
Date date = getDateValue(arguments, 0, inputTypes, converters);
if (date == null) {
return null;
}
calendar.setTime(date);
int month = calendar.get(Calendar.MONTH);
int quarter = (month + 3) / 3;
output.set(quarter);
return output;
}
@Override
protected String getFuncName() {
return "quarter";
}
@Override
public String getDisplayString(String[] children) {
return getStandardDisplayString(getFuncName(), children);
}
}