Mega Code Archive
Creates a new and empty directory in the default temp directory using the given prefix
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/*
* Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2006.
*
* Licensed under the Aduna BSD-style license.
*/
import java.io.File;
import java.io.IOException;
public class Main {
/**
* Creates a new and empty directory in the default temp directory using the
* given prefix. This methods uses {@link File#createTempFile} to create a
* new tmp file, deletes it and creates a directory for it instead.
*
* @param prefix The prefix string to be used in generating the diretory's
* name; must be at least three characters long.
* @return A newly-created empty directory.
* @throws IOException If no directory could be created.
*/
public static File createTempDir(String prefix)
throws IOException
{
String tmpDirStr = System.getProperty("java.io.tmpdir");
if (tmpDirStr == null) {
throw new IOException(
"System property 'java.io.tmpdir' does not specify a tmp dir");
}
File tmpDir = new File(tmpDirStr);
if (!tmpDir.exists()) {
boolean created = tmpDir.mkdirs();
if (!created) {
throw new IOException("Unable to create tmp dir " + tmpDir);
}
}
File resultDir = null;
int suffix = (int)System.currentTimeMillis();
int failureCount = 0;
do {
resultDir = new File(tmpDir, prefix + suffix % 10000);
suffix++;
failureCount++;
}
while (resultDir.exists() && failureCount < 50);
if (resultDir.exists()) {
throw new IOException(failureCount +
" attempts to generate a non-existent directory name failed, giving up");
}
boolean created = resultDir.mkdir();
if (!created) {
throw new IOException("Failed to create tmp directory");
}
return resultDir;
}
}
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