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Java API to handle Microsoft OLE 2 Compound Document format (Word, Excel). Based on poi-2.5.1-final-20040804.jar, with bugfixes for OLE v2 and memory efficiency improvements. Used by Bio-Formats for OLE support (cxd, ipw, oib, zvi). Used by VisBio overlays logic for XLS export feature.

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/*
 * #%L
 * Fork of Apache Jakarta POI.
 * %%
 * Copyright (C) 2008 - 2016 Open Microscopy Environment:
 *   - Board of Regents of the University of Wisconsin-Madison
 *   - Glencoe Software, Inc.
 *   - University of Dundee
 * %%
 * 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.
 * #L%
 */
/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   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
   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 loci.poi.util;

import java.io.File;
import java.io.IOException;
import java.util.Random;

/**
 * Interface for creating temporary files.  Collects them all into one directory.
 *
 * @author Glen Stampoultzis
 */
public class TempFile
{
    static File dir;
    static 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.
     * 
     * Dont forget to close all files or it might not be possible to delete them.
     */
    public static File createTempFile(String prefix, String suffix) throws IOException
    {
        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;
    }



}