/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.cdap.data.stream.decoder;
import co.cask.cdap.api.flow.flowlet.StreamEvent;
import co.cask.cdap.api.stream.StreamEventDecoder;
import com.google.common.base.Charsets;
import org.apache.hadoop.io.LongWritable;
/**
* A {@link StreamEventDecoder} that decodes {@link StreamEvent} into {@link LongWritable} as key and {@link String} as
* value for Mapper input. The key carries the event timestamp, while the text value is a UTF-8 decode of the
* event body.
*/
public class StringStreamEventDecoder implements StreamEventDecoder<LongWritable, String> {
private final LongWritable key = new LongWritable();
@Override
public DecodeResult<LongWritable, String> decode(StreamEvent event, DecodeResult<LongWritable, String> result) {
key.set(event.getTimestamp());
return result.setKey(key).setValue(Charsets.UTF_8.decode(event.getBody()).toString());
}
}