org.apache.poi.util.TempFile Maven / Gradle / Ivy
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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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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,
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See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.util;
import java.io.File;
import java.util.Random;
/**
* Interface for creating temporary files. Collects them all into one directory.
*
* @author Glen Stampoultzis
*/
public final class TempFile {
private static File dir;
private static final Random rnd = new Random();
/**
* Creates a temporary file. Files are collected into one directory and by default are
* deleted on exit from the VM. Files can be kept by defining the system property
* poi.keep.tmp.files.
*
* Don't forget to close all files or it might not be possible to delete them.
*/
public static File createTempFile(String prefix, String suffix) {
if (dir == null)
{
dir = new File(System.getProperty("java.io.tmpdir"), "poifiles");
dir.mkdir();
if (System.getProperty("poi.keep.tmp.files") == null)
dir.deleteOnExit();
}
File newFile = new File(dir, prefix + rnd.nextInt() + suffix);
if (System.getProperty("poi.keep.tmp.files") == null)
newFile.deleteOnExit();
return newFile;
}
}