1 /*
   2  * Copyright (c) 2003, 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 /*
  25  * @test
  26  * @bug 4892682 4892698
  27  * @summary Tests that the appropriate IllegalStateException is thrown if
  28  *          ImageReader.read() or ImageWriter.write() is called without having
  29  *          first set the input/output stream
  30  */
  31 
  32 import java.awt.image.BufferedImage;
  33 import java.util.Iterator;
  34 
  35 import javax.imageio.ImageReader;
  36 import javax.imageio.ImageWriter;
  37 import javax.imageio.spi.IIORegistry;
  38 import javax.imageio.spi.ImageReaderSpi;
  39 import javax.imageio.spi.ImageWriterSpi;
  40 
  41 public class NullInputOutput {
  42 
  43     public static void main(String[] args) throws Exception {
  44         IIORegistry registry = IIORegistry.getDefaultInstance();
  45 
  46         // test ImageReader.read() for all available ImageReaders
  47         Iterator readerspis = registry.getServiceProviders(ImageReaderSpi.class,
  48                                                            false);
  49         while (readerspis.hasNext()) {
  50             ImageReaderSpi readerspi = (ImageReaderSpi)readerspis.next();
  51             ImageReader reader = readerspi.createReaderInstance();
  52             try {
  53                 reader.read(0);
  54             } catch (IllegalStateException ise) {
  55                 // caught exception, everything's okay
  56             }
  57         }
  58 
  59         // test ImageWriter.write() for all available ImageWriters
  60         BufferedImage bi = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
  61         Iterator writerspis = registry.getServiceProviders(ImageWriterSpi.class,
  62                                                            false);
  63         while (writerspis.hasNext()) {
  64             ImageWriterSpi writerspi = (ImageWriterSpi)writerspis.next();
  65             ImageWriter writer = writerspi.createWriterInstance();
  66             try {
  67                 writer.write(bi);
  68             } catch (IllegalStateException ise) {
  69                 // caught exception, everything's okay
  70             }
  71         }
  72     }
  73 }