/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.test.recordJobs.kmeans.udfs;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import eu.stratosphere.api.java.record.io.DelimitedOutputFormat;
import eu.stratosphere.types.IntValue;
import eu.stratosphere.types.Record;
/**
* Writes records that contain an id and a CoordVector.
* The output format is line-based, i.e. one record is written to
* a line and terminated with '\n'. Within a line the first '|' character
* separates the id from the CoordVector. The vector consists of a vector of
* decimals. The decimals are separated by '|'. The is is the id of a data
* point or cluster center and the vector the corresponding position
* (coordinate vector) of the data point or cluster center. Example line:
* "42|23.23|52.57|74.43| Id: 42 Coordinate vector: (23.23, 52.57, 74.43)
*/
public class PointOutFormat extends DelimitedOutputFormat {
private static final long serialVersionUID = 1L;
private final DecimalFormat df = new DecimalFormat("####0.00");
private final StringBuilder line = new StringBuilder();
public PointOutFormat() {
DecimalFormatSymbols dfSymbols = new DecimalFormatSymbols();
dfSymbols.setDecimalSeparator('.');
this.df.setDecimalFormatSymbols(dfSymbols);
}
@Override
public int serializeRecord(Record record, byte[] target) {
line.setLength(0);
IntValue centerId = record.getField(0, IntValue.class);
CoordVector centerPos = record.getField(1, CoordVector.class);
line.append(centerId.getValue());
for (double coord : centerPos.getCoordinates()) {
line.append('|');
line.append(df.format(coord));
}
line.append('|');
byte[] byteString = line.toString().getBytes();
if (byteString.length <= target.length) {
System.arraycopy(byteString, 0, target, 0, byteString.length);
return byteString.length;
}
else {
return -byteString.length;
}
}
}