org.apache.hadoop.hive.ql.udf.generic.GenericUDFUnixTimeStamp 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.udf.generic;

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.ql.udf.UDFType;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;

@UDFType(deterministic = false)
@Description(name = "unix_timestamp",
    value = "_FUNC_([date[, pattern]]) - Returns the UNIX timestamp",
    extended = "Converts the current or specified time to number of seconds "
        + "since 1970-01-01.")
public class GenericUDFUnixTimeStamp extends GenericUDFToUnixTimeStamp {

  @Override
  protected void initializeInput(ObjectInspector[] arguments) throws UDFArgumentException {
    if (arguments.length > 0) {
      super.initializeInput(arguments);
    }
  }

  @Override
  protected String getName() {
    return "unix_timestamp";
  }

  @Override
  public Object evaluate(DeferredObject[] arguments) throws HiveException {
    if (arguments.length == 0) {
      retValue.set(System.currentTimeMillis() / 1000);
      return retValue;
    }
    return super.evaluate(arguments);
  }
}