/*
* Copyright (c) 2011-2015 EPFL DATA Laboratory
* Copyright (c) 2014-2015 The Squall Collaboration (see NOTICE)
*
* 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 ch.epfl.data.squall.operators;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
import ch.epfl.data.squall.utilities.MyUtilities;
import ch.epfl.data.squall.utilities.SystemParameters;
import ch.epfl.data.squall.visitors.OperatorVisitor;
public class PrintOperator extends OneToOneOperator {
private static final long serialVersionUID = 1L;
private int _numTuplesProcessed = 0;
private Map _map;
private String _printPath;
private PrintWriter _writer = null;
// TODO
/*
* _writer.close } catch (IOException e) { //exception handling left as an
* exercise for the reader }
*/
public PrintOperator(String filename, Map map) {
_map = map;
_printPath = SystemParameters.getString(map, "DIP_DATA_PATH") + "/"
+ filename;
}
@Override
public void accept(OperatorVisitor ov) {
ov.visit(this);
}
public void finalizeProcessing() {
if (_writer != null) {
_writer.close();
}
}
@Override
public List<String> getContent() {
throw new RuntimeException(
"getContent for PrintOperator should never be invoked!");
}
@Override
public int getNumTuplesProcessed() {
return _numTuplesProcessed;
}
@Override
public boolean isBlocking() {
return false;
}
@Override
public String printContent() {
throw new RuntimeException(
"printContent for PrintOperator should never be invoked!");
}
@Override
public List<String> processOne(List<String> tuple, long lineageTimestamp) {
if (_writer == null) {
try {
// if(SystemParameters.getBoolean(_map, "DIP_DISTRIBUTED")){
// _printPath += "." + InetAddress.getLocalHost().getHostName();
// }
// initialize file to empty
_writer = new PrintWriter(new BufferedWriter(new FileWriter(
_printPath, false)));
_writer.close();
// open file for writing with append = true
_writer = new PrintWriter(new BufferedWriter(new FileWriter(
_printPath, true)));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
_numTuplesProcessed++;
String str = MyUtilities.tupleToString(tuple, _map);
_writer.println(str);
return tuple;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("PrintOperator ");
return sb.toString();
}
}