1 /*
   2  * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.io.ByteArrayInputStream;
  25 import java.io.ByteArrayOutputStream;
  26 import java.io.File;
  27 import java.io.IOException;
  28 
  29 import javax.imageio.ImageIO;
  30 import javax.imageio.stream.ImageInputStream;
  31 import javax.imageio.stream.ImageOutputStream;
  32 
  33 public class DeleteOnExitTest {
  34     public static void main(String[] args) throws IOException {
  35         ByteArrayInputStream is =
  36             new ByteArrayInputStream(new byte[100]);
  37         ByteArrayOutputStream os =
  38             new ByteArrayOutputStream();
  39 
  40         String tmp = System.getProperty("java.io.tmpdir", ".");
  41         System.out.println("tmp: " + tmp);
  42 
  43         // count number of files before test
  44         ImageIO.setUseCache(true);
  45         ImageIO.setCacheDirectory(new File(tmp));
  46 
  47         File tmpDir = ImageIO.getCacheDirectory();
  48         System.out.println("tmpDir is " + tmpDir);
  49         int fnum_before = tmpDir.list().length;
  50         System.out.println("Files before test: " + fnum_before);
  51 
  52         ImageInputStream iis =
  53             ImageIO.createImageInputStream(is);
  54         System.out.println("iis = " + iis);
  55 
  56         ImageInputStream iis2 =
  57             ImageIO.createImageInputStream(is);
  58 
  59         ImageOutputStream ios =
  60             ImageIO.createImageOutputStream(os);
  61         System.out.println("ios = " + ios);
  62 
  63         ImageOutputStream ios2 =
  64             ImageIO.createImageOutputStream(os);
  65 
  66         iis2.close();
  67         ios2.close();
  68         int fnum_after = tmpDir.list().length;
  69         System.out.println("Files after test: " + fnum_after);
  70 
  71         if (fnum_before == fnum_after) {
  72             throw new RuntimeException("Test failed: cache was not used.");
  73         }
  74     }
  75 }