| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| 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. |
| |
| The methods in this class are designed to find the requested resources in as |
| many cases as possible. They search various places, roughly from most |
| specific to most general. This works well if a component is known to bring |
| with it a certain resource, and that resource has to be found. However, it |
| might not work very well in cases where you want to check whether a |
| component brings with it a certain resource or not: a similarly named |
| resource from another component might be found by the eager search |
| algorithm. |
| */ |
| 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) { |
| String syslibname = System.mapLibraryName(libname); |
| |
| File path = getResource(loader, System.mapLibraryName(libname)); |
| if (path == null) { |
| // check special jni lib extension on Mac |
| if (syslibname.contains("dylib")) { |
| syslibname = syslibname.replace("dylib", "jnilib"); |
| } |
| path = getResource(loader, syslibname); |
| } |
| |
| if (path == null) { |
| // If the library cannot be found as a class loader resource, try |
| // the global System.loadLibrary as a last resort: |
| System.loadLibrary(libname); |
| } else { |
| 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 = UrlToFileMapper.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 = UrlToFileMapper.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 |
| } |