/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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 com.linkedin.pinot.core.operator.transform.function;
import com.google.common.base.Preconditions;
import com.linkedin.pinot.common.data.FieldSpec;
import com.linkedin.pinot.core.common.BlockValSet;
import com.linkedin.pinot.core.plan.DocIdSetPlanNode;
import java.util.concurrent.TimeUnit;
import javax.annotation.concurrent.NotThreadSafe;
/**
* This class implements the time conversion transform.
* <ul>
* <li> Inputs: </li>
* <ul>
* <li> Input time values </li>
* <li> Input time unit as defined in {@link TimeUnit} </li>
* <li> Desired output time unit as defined in {@link TimeUnit} </li>
* </ul>
* </ul>
*
* <ul>
* <li> Outputs: </li>
* <ul>
* <li> Time values converted into desired time unit. </li>
* </ul>
* </ul>
*/
@NotThreadSafe
public class TimeConversionTransform implements TransformFunction {
private static final String TRANSFORM_NAME = "timeConvert";
private long[] _output = null;
@Override
public <T> T transform(int length, BlockValSet... input) {
Preconditions.checkArgument(input.length == 3, TRANSFORM_NAME + " expects three arguments");
long[] inputTime = input[0].getLongValuesSV();
String[] inputTimeUnits = input[1].getStringValuesSV();
String[] outputTimeUnits = input[2].getStringValuesSV();
Preconditions.checkState(inputTime.length >= length && inputTimeUnits.length >= length,
outputTimeUnits.length >= length);
TimeUnit inputTimeUnit = TimeUnit.valueOf(inputTimeUnits[0]);
TimeUnit outputTimeUnit = TimeUnit.valueOf(outputTimeUnits[0]);
if (_output == null || _output.length < length) {
_output = new long[Math.max(length, DocIdSetPlanNode.MAX_DOC_PER_CALL)];
}
for (int i = 0; i < length; i++) {
_output[i] = outputTimeUnit.convert(inputTime[i], inputTimeUnit);
}
return (T) _output;
}
@Override
public FieldSpec.DataType getOutputType() {
return FieldSpec.DataType.LONG;
}
@Override
public String getName() {
return TRANSFORM_NAME;
}
}