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/*****************************************************************************
* Java Plug-in Framework (JPF)
* Copyright (C) 2004-2006 Dmitry Olshansky
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
package org.java.plugin.tools;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.java.plugin.util.IoUtil;
/**
* @version $Id$
*/
final class Util {
private static Log log = LogFactory.getLog(Util.class);
private static File tempFolder;
private static boolean tempFolderInitialized = false;
static File getTempFolder() throws IOException {
if (tempFolder != null) {
return tempFolderInitialized ? tempFolder : null;
}
synchronized (Util.class) {
tempFolder = new File(System.getProperty("java.io.tmpdir"), //$NON-NLS-1$
System.currentTimeMillis() + ".jpf-tool-cache"); //$NON-NLS-1$
log.debug("libraries cache folder is " + tempFolder); //$NON-NLS-1$
File lockFile = new File(tempFolder, "lock"); //$NON-NLS-1$
if (lockFile.exists()) {
throw new IOException("can't initialize temporary folder " //$NON-NLS-1$
+ tempFolder + " as lock file indicates that it is " //$NON-NLS-1$
+ "owned by another JPF instance"); //$NON-NLS-1$
}
if (tempFolder.exists()) {
// clean up folder
IoUtil.emptyFolder(tempFolder);
} else {
tempFolder.mkdirs();
}
if (!lockFile.createNewFile()) {
throw new IOException("can\'t create lock file in JPF " //$NON-NLS-1$
+ "tool temporary folder " + tempFolder); //$NON-NLS-1$
}
lockFile.deleteOnExit();
tempFolder.deleteOnExit();
tempFolderInitialized = true;
}
return tempFolder;
}
static byte[] readUrlContent(final URL url) throws IOException {
ByteArrayOutputStream result = new ByteArrayOutputStream();
InputStream urlStrm = url.openStream();
try {
IoUtil.copyStream(urlStrm, result, 256);
} finally {
urlStrm.close();
}
return result.toByteArray();
}
private Util() {
// no-op
}
}
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