Source Code Cross Referenced for JarReader.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » jarutil » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.jarutil 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         *   
03:         *
04:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06:         * 
07:         * This program is free software; you can redistribute it and/or
08:         * modify it under the terms of the GNU General Public License version
09:         * 2 only, as published by the Free Software Foundation. 
10:         * 
11:         * This program is distributed in the hope that it will be useful, but
12:         * WITHOUT ANY WARRANTY; without even the implied warranty of
13:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14:         * General Public License version 2 for more details (a copy is
15:         * included at /legal/license.txt). 
16:         * 
17:         * You should have received a copy of the GNU General Public License
18:         * version 2 along with this work; if not, write to the Free Software
19:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20:         * 02110-1301 USA 
21:         * 
22:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23:         * Clara, CA 95054 or visit www.sun.com if you need additional
24:         * information or have any questions. 
25:         */
26:
27:        package com.sun.midp.jarutil;
28:
29:        import java.lang.String;
30:
31:        import java.io.IOException;
32:
33:        import com.sun.j2me.security.AccessController;
34:
35:        import com.sun.midp.io.Util;
36:
37:        import com.sun.midp.security.Permissions;
38:
39:        /**
40:         * This class provides a Java API for reading an entry from a Jar file stored
41:         * on the file system.
42:         */
43:        public class JarReader {
44:            /**
45:             * Returns the content of the given entry in the JAR file on the
46:             * file system given by jarFilePath.
47:             * <p>
48:             * Method requires com.sun.midp.ams permission.
49:             *
50:             * @param jarFilePath file pathname of the JAR file to read. May
51:             *          be a relative pathname.
52:             * @param entryName name of the entry to return.
53:             *
54:             * @return the content of the given entry in a byte array or null if
55:             *          the entry was not found
56:             *
57:             * @exception IOException if JAR is corrupt or not found
58:             * @exception IOException if the entry does not exist.
59:             * @exception SecurityException if the caller does not have permission
60:             *   to install software.
61:             */
62:            public static byte[] readJarEntry(String jarFilePath,
63:                    String entryName) throws IOException {
64:                AccessController
65:                        .checkPermission(Permissions.AMS_PERMISSION_NAME);
66:
67:                if (entryName.charAt(0) == '/') {
68:                    /*
69:                     * Strip off the leading directory separator, or the
70:                     * resource will not be found in the JAR.
71:                     */
72:                    entryName = entryName.substring(1, entryName.length());
73:                }
74:
75:                return readJarEntry0(jarFilePath, entryName);
76:            }
77:
78:            /**
79:             * Performs the same function as readJarEntry.
80:             *
81:             * @param localJarFilePath file pathname of the JAR file to read. May
82:             *          be a relative pathname.
83:             * @param localEntryName name of the entry to return.
84:             *
85:             * @return the content of the given entry in a byte array or null if
86:             *         the entry was not found
87:             *
88:             * @exception IOException if JAR is corrupt or not found
89:             */
90:            private static native byte[] readJarEntry0(String localJarFilePath,
91:                    String localEntryName) throws IOException;
92:        }
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