INTEGRATION: CWS tune01 (1.1.2); FILE ADDED

2003/03/12 15:06:40 sb 1.1.2.1: #107990# Introduced NativeLibraryLoader to unify loading/locating system libraries.

1 files changed, 150 insertions, 0 deletions

diff --git a/jurt/com/sun/star/lib/util/NativeLibraryLoader.java b/jurt/com/sun/star/lib/util/NativeLibraryLoader.java
new file mode 100644
index 000000000..4517b9f0e
--- /dev/null
+++ b/jurt/com/sun/star/lib/util/NativeLibraryLoader.java
@@ -0,0 +1,150 @@
+/*************************************************************************
+ *
+ *  $RCSfile: NativeLibraryLoader.java,v $
+ *
+ *  $Revision: 1.2 $
+ *
+ *  last change: $Author: vg $ $Date: 2003-04-15 14:34:07 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (the "License"); You may not use this file
+ *  except in compliance with the License. You may obtain a copy of the
+ *  License at http://www.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+package com.sun.star.lib.util;
+
+import java.io.File;
+import java.net.URL;
+import java.net.URLClassLoader;
+
+/** Helper functions to locate and load native files.
+ */
+public final class NativeLibraryLoader {
+    /** Load a system library, using a given class loader to locate the library.
+
+        This is similar to System.loadLibrary.
+
+        @param loader a class loader; may be null
+
+        @param libname the library name; how this name is mapped to a system
+        library name is system dependent
+     */
+    public static void loadLibrary(ClassLoader loader, String libname) {
+        File path = getResource(loader, System.mapLibraryName(libname));
+        if (path == null) {
+            throw new UnsatisfiedLinkError(
+                "Don't know how to load native library " + libname);
+        }
+        System.load(path.getAbsolutePath());
+    }
+
+    /** Locate a system resource, using a given class loader.
+
+        This is similar to ClassLoader.getResource, but only works for local
+        resources (local files), and adds additional functionality for
+        URLClassLoaders.
+
+        @param loader a class loader; may be null
+
+        @param name a resource name (that is, the name of a file)
+
+        @return a File locating the resource, or null if the resource was not
+        found
+     */
+    public static File getResource(ClassLoader loader, String name) {
+        if (loader != null) {
+            File path = mapUrlToFile(loader.getResource(name));
+            if (path != null) {
+                return path;
+            }
+        }
+        // URLClassLoaders work on lists of URLs, which are typically URLs
+        // locating JAR files (scheme://auth/dir1/dir2/some.jar).  The following
+        // code looks for resource name beside the JAR file
+        // (scheme://auth/dir1/dir2/name) and one directory up
+        // (scheme://auth/dir1/name).  The second step is important in a typical
+        // OOo installation, where the JAR files are in the program/classes
+        // directory while the shared libraries are in the program directory.
+        if (loader instanceof URLClassLoader) {
+            URL[] urls = ((URLClassLoader) loader).getURLs();
+            for (int i = 0; i < urls.length; ++i) {
+                File path = mapUrlToFile(urls[i]);
+                if (path != null) {
+                    File dir = path.isDirectory() ? path : path.getParentFile();
+                    if (dir != null) {
+                        path = new File(dir, name);
+                        if (path.exists()) {
+                            return path;
+                        }
+                        dir = dir.getParentFile();
+                        if (dir != null) {
+                            path = new File(dir, name);
+                            if (path.exists()) {
+                                return path;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return null;
+    }
+
+    private NativeLibraryLoader() {} // do not instantiate
+
+    private static File mapUrlToFile(URL url) {
+        if (url != null && url.getProtocol().equalsIgnoreCase("file")) {
+            String f = url.getFile();
+            return new File(f == null ? "" : f);
+        }
+        return null;
+    }
+}