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/*************************************************************************
*
* $RCSfile: NativeLibraryLoader.java,v $
*
* $Revision: 1.3 $
*
* last change: $Author: rt $ $Date: 2003-04-24 15:18:46 $
*
* 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.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLDecoder;
/** 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
// java.net.URI is only available since Java 1.4:
private static Class uriClass;
private static Constructor uriConstructor;
private static Constructor fileConstructor;
static {
try {
uriClass = Class.forName("java.net.URI");
uriConstructor = uriClass.getConstructor(
new Class[] { String.class });
fileConstructor = File.class.getConstructor(
new Class[] { uriClass });
} catch (ClassNotFoundException e) {
} catch (NoSuchMethodException e) {
}
}
private static File mapUrlToFile(URL url) {
if (url == null) {
return null;
} else if (fileConstructor == null) {
// If java.net.URI is not available, hope that the following works
// well: First, check that the given URL has a certain form.
// Second, use the URLDecoder to decode the URL path (taking care
// not to change any plus signs to spaces), hoping that the used
// default encoding is the proper one for file URLs. Third, create
// a File from the decoded path.
return url.getProtocol().equalsIgnoreCase("file")
&& url.getAuthority() == null && url.getQuery() == null
&& url.getRef() == null
? new File(URLDecoder.decode(replace(url.getPath(), '+',
"%2B")))
: null;
} else {
// If java.net.URI is avaliable, do
// URI uri = new URI(url.toString());
// try {
// return new File(uri);
// } catch (IllegalArgumentException e) {
// return null;
// }
try {
Object uri = uriConstructor.newInstance(
new Object[] { url.toString() });
try {
return (File) fileConstructor.newInstance(
new Object[] { uri });
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof
IllegalArgumentException) {
return null;
} else {
throw e;
}
}
} catch (InstantiationException e) {
throw new RuntimeException("This cannot happen: " + e);
} catch (IllegalAccessException e) {
throw new RuntimeException("This cannot happen: " + e);
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof Error) {
throw (Error) e.getTargetException();
} else if (e.getTargetException() instanceof RuntimeException) {
throw (RuntimeException) e.getTargetException();
} else {
throw new RuntimeException("This cannot happen: " + e);
}
}
}
}
private static String replace(String str, char from, String to) {
StringBuffer b = new StringBuffer();
for (int i = 0;;) {
int j = str.indexOf(from, i);
if (j == -1) {
b.append(str.substring(i));
break;
} else {
b.append(str.substring(i, j));
b.append(to);
i = j + 1;
}
}
return b.toString();
}
}
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