1 /*

     2  * Copyright (c) 1996, 1998, 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 

    27 package sun.tools.jar;

    28 

    29 import sun.awt.image.URLImageSource;

    30 import sun.awt.image.ImageDecoder;

    31 import java.net.URL;

    32 import java.net.JarURLConnection;

    33 import java.util.jar.JarFile;

    34 import java.util.jar.JarEntry;

    35 import java.io.InputStream;

    36 import java.io.IOException;

    37 

    38 

    39 public class JarImageSource extends URLImageSource {

    40     String mimeType;

    41     String entryName = null;

    42     URL url;

    43 

    44     /**

    45      * Create an image source from a Jar entry URL with the specified

    46      * mime type.

    47      */

    48     public JarImageSource(URL u, String type) {

    49         super(u);

    50         url = u;

    51         mimeType = type;

    52     }

    53 

    54     /**

    55      * Create an image source from a Jar file/entry URL

    56      * with the specified entry name and mime type.

    57      */

    58     public JarImageSource(URL u, String name, String type) {

    59         this(u, type);

    60         this.entryName = name;

    61     }

    62 

    63     protected ImageDecoder getDecoder() {

    64         InputStream is = null;

    65         try {

    66             JarURLConnection c = (JarURLConnection)url.openConnection();

    67             JarFile f = c.getJarFile();

    68             JarEntry e = c.getJarEntry();

    69 

    70             if (entryName != null && e == null) {

    71                 e = f.getJarEntry(entryName);

    72             }

    73             if (e == null || (e != null && entryName != null

    74                               && (!(entryName.equals(e.getName()))))) {

    75                 return null;

    76             }

    77             is = f.getInputStream(e);

    78         } catch (IOException e) {

    79             return null;

    80         }

    81 

    82         ImageDecoder id = decoderForType(is, mimeType);

    83         if (id == null) {

    84             id = getDecoder(is);

    85         }

    86         return id;

    87     }

    88 }