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Diffstat (limited to 'ridljar/com/sun/star/lib/util/NativeLibraryLoader.java')
| -rw-r--r-- | ridljar/com/sun/star/lib/util/NativeLibraryLoader.java | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/ridljar/com/sun/star/lib/util/NativeLibraryLoader.java b/ridljar/com/sun/star/lib/util/NativeLibraryLoader.java new file mode 100644 index 000000000..d255a71ea --- /dev/null +++ b/ridljar/com/sun/star/lib/util/NativeLibraryLoader.java @@ -0,0 +1,141 @@ +/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * 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 . + */ +package com.sun.star.lib.util; + +import java.io.File; +import java.net.URL; +import java.net.URLClassLoader; +import com.sun.star.lib.unoloader.UnoClassLoader; + +/** + * Helper functions to locate and load native files. + * + * <p>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.</p> + */ +public final class NativeLibraryLoader { + static { + // if it's some other class loader, then resolving the symbol + // Java_com_sun_star_bridges_jni_1uno_JNI_1proxy_dispatch_1call in + // java_uno will not work and result in UnsatisfiedLinkError + if (!(NativeLibraryLoader.class.getClassLoader() instanceof com.sun.star.lib.unoloader.UnoClassLoader)) { + System.err.println("warning: com.sun.star.lib.util.NativeLibraryLoader must be loaded by com.sun.star.lib.unoloader.UnoClassLoader for java_uno bridge to work (not a problem if this is using Java remote bridge or unit test)"); + } + } + /** + * Load a system library, using a given class loader to locate the library. + * + * <p>This is similar to <code>System.loadLibrary</code>.</p> + * + * @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 sysname = System.mapLibraryName(libname); + // At least Oracle's 1.7.0_51 now maps to .dylib rather than .jnilib: + if (System.getProperty("os.name").startsWith("Mac") + && sysname.endsWith(".dylib")) + { + sysname + = sysname.substring(0, sysname.length() - "dylib".length()) + + "jnilib"; + } + File path = getResource(loader, sysname); + 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. + * + * <p>This is similar to <code>ClassLoader.getResource</code>, but only works + * for local resources (local files), and adds additional functionality for + * <code>URLClassLoaders</code>.</p> + * + * @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)) { + return null; + } + 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; + } + // On macOS, dir is now the Resources dir, + // we want to look in Frameworks + if (System.getProperty("os.name").startsWith("Mac") + && dir.getName().equals("Resources")) { + dir = dir.getParentFile(); + path = new File(dir, "Frameworks/" + name); + if (path.exists()) { + return path; + } + } + } + } + } + } + return null; + } + + private NativeLibraryLoader() {} // do not instantiate +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |