1 /*
   2  * Copyright (c) 2000, 2001, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.imageio.spi;
  27 
  28 import java.io.File;
  29 import java.io.InputStream;
  30 import java.io.IOException;
  31 import java.util.Locale;
  32 import javax.imageio.spi.ImageInputStreamSpi;
  33 import javax.imageio.stream.ImageInputStream;
  34 import javax.imageio.stream.FileCacheImageInputStream;
  35 import javax.imageio.stream.MemoryCacheImageInputStream;
  36 
  37 public class InputStreamImageInputStreamSpi extends ImageInputStreamSpi {
  38 
  39     private static final String vendorName = "Oracle Corporation";
  40 
  41     private static final String version = "1.0";
  42 
  43     private static final Class inputClass = InputStream.class;
  44 
  45     public InputStreamImageInputStreamSpi() {
  46         super(vendorName, version, inputClass);
  47     }
  48 
  49     public String getDescription(Locale locale) {
  50         return "Service provider that instantiates a FileCacheImageInputStream or MemoryCacheImageInputStream from an InputStream";
  51     }
  52 
  53     public boolean canUseCacheFile() {
  54         return true;
  55     }
  56 
  57     public boolean needsCacheFile() {
  58         return false;
  59     }
  60 
  61     public ImageInputStream createInputStreamInstance(Object input,
  62                                                       boolean useCache,
  63                                                       File cacheDir)
  64         throws IOException {
  65         if (input instanceof InputStream) {
  66             InputStream is = (InputStream)input;
  67 
  68             if (useCache) {
  69                 return new FileCacheImageInputStream(is, cacheDir);
  70             } else {
  71                 return new MemoryCacheImageInputStream(is);
  72             }
  73         } else {
  74             throw new IllegalArgumentException();
  75         }
  76     }
  77 }