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package de.lmu.ifi.dbs.elki.result.textwriter;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.HashMap;
import java.util.zip.GZIPOutputStream;
import de.lmu.ifi.dbs.elki.logging.Logging;
/**
* Manage output to multiple files.
*
* @author Erich Schubert
*/
public class MultipleFilesOutput implements StreamFactory {
/**
* File name extension.
*/
private final static String EXTENSION = ".txt";
/**
* GZip extra file extension
*/
private final static String GZIP_EXTENSION = ".gz";
/**
* Default stream to write to when no name is supplied.
*/
private PrintStream defaultStream = null;
/**
* Base file name.
*/
private File basename;
/**
* HashMap of open print streams.
*/
private HashMap<String, PrintStream> map = new HashMap<String, PrintStream>();
/**
* Control gzip compression of output.
*/
private boolean usegzip = false;
/**
* Logger for debugging.
*/
private final static Logging logger = Logging.getLogger(MultipleFilesOutput.class);
/**
* Constructor
*
* @param base Base file name (folder name)
*/
public MultipleFilesOutput(File base) {
this(base, false);
}
/**
* Constructor
*
* @param base Base file name (folder name)
* @param gzip Use gzip compression.
*/
public MultipleFilesOutput(File base, boolean gzip) {
this.basename = base;
this.usegzip = gzip;
}
/**
* Retrieve/open the default output stream.
*
* @return default output stream
* @throws IOException
*/
private PrintStream getDefaultStream() throws IOException {
if(defaultStream != null) {
return defaultStream;
}
defaultStream = newStream("default");
return defaultStream;
}
/**
* Open a new stream of the given name
*
* @param name file name (which will be appended to the base name)
* @return stream object for the given name
* @throws IOException
*/
private PrintStream newStream(String name) throws IOException {
if (logger.isDebuggingFiner()) {
logger.debugFiner("Requested stream: "+name);
}
PrintStream res = map.get(name);
if(res != null) {
return res;
}
// Ensure the directory exists:
if(!basename.exists()) {
basename.mkdirs();
}
String fn = basename.getAbsolutePath() + File.separator + name + EXTENSION;
if (usegzip) {
fn = fn + GZIP_EXTENSION;
}
File n = new File(fn);
OutputStream os = new FileOutputStream(n);
if (usegzip) {
// wrap into gzip stream.
os = new GZIPOutputStream(os);
}
res = new PrintStream(os);
if (logger.isDebuggingFiner()) {
logger.debugFiner("Opened new output stream:"+fn);
}
// cache.
map.put(name, res);
return res;
}
/**
* Retrieve the output stream for the given file name.
*/
@Override
public PrintStream openStream(String filename) throws IOException {
if(filename == null) {
return getDefaultStream();
}
return newStream(filename);
}
/**
* Get GZIP compression flag.
*
* @return if GZIP compression is enabled
*/
protected boolean isGzipCompression() {
return usegzip;
}
/**
* Set GZIP compression flag.
*
* @param usegzip use GZIP compression
*/
protected void setGzipCompression(boolean usegzip) {
this.usegzip = usegzip;
}
/**
* Close (and forget) all output streams.
*/
@Override
public synchronized void closeAllStreams() {
for (PrintStream s : map.values()) {
s.close();
}
map.clear();
}
}
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