org.apache.hadoop.hive.ql.udf.UDFSessionTimeZone.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.udf.UDFSessionTimeZone.java

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/**
* Tencent is pleased to support the open source community by making TDW available.
* Copyright (C) 2014 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed 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 java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.exec.description;
import org.apache.hadoop.io.Text;

@description(name = "sessiontimezone", value = "_FUNC_() - returns the current session's time zone", extended = "Example:\n "
        + "  > SELECT _FUNC_() FROM src LIMIT 1;\n" + "Asia/Shanghai")
public class UDFSessionTimeZone extends UDF {

    private static Log LOG = LogFactory.getLog(UDFSessionTimeZone.class.getName());

    Text result = new Text();

    public UDFSessionTimeZone() {
    }

    public Text evaluate() {

        try {
            TimeZone tz = TimeZone.getDefault();
            Calendar calendar = Calendar.getInstance(tz);
            int off = calendar.get(Calendar.ZONE_OFFSET);
            off = off / 3600000;
            String ooo = String.format("%1$+03d", off);
            ooo = ooo + ":00";
            result.set(ooo);
            return result;
        } catch (Exception e) {
            return null;
        }
    }

}