com.lithium.yoda.HourOfDay.java Source code

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Here is the source code for com.lithium.yoda.HourOfDay.java

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/*
 * Licensed to Lithium Technologies Inc. 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 com.lithium.yoda;

import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.LongObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.joda.time.MutableDateTime;

/**
 * @author pradeep.gollakota
 */
public class HourOfDay extends GenericUDF {

    private LongObjectInspector loi;
    private transient MutableDateTime dt;

    @Override
    public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
        loi = PrimitiveObjectInspectorFactory.javaLongObjectInspector;
        dt = new MutableDateTime(0);
        return PrimitiveObjectInspectorFactory.javaIntObjectInspector;
    }

    @Override
    public Object evaluate(DeferredObject[] arguments) throws HiveException {
        dt.setTime(loi.get(arguments[0].get()));
        return dt.getHourOfDay();
    }

    @Override
    public String getDisplayString(String[] children) {
        throw new UnsupportedOperationException("Not implemented yet.");
    }
}