diff options
Diffstat (limited to 'odk/source/com/sun/star/lib/loader/Loader.java')
| -rw-r--r-- | odk/source/com/sun/star/lib/loader/Loader.java | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/odk/source/com/sun/star/lib/loader/Loader.java b/odk/source/com/sun/star/lib/loader/Loader.java new file mode 100644 index 000000000..bc1a3c3e7 --- /dev/null +++ b/odk/source/com/sun/star/lib/loader/Loader.java @@ -0,0 +1,340 @@ +/* -*- 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.loader; + +import java.io.File; +import java.io.IOException; +import java.io.InputStream; +import java.io.UnsupportedEncodingException; +import java.lang.reflect.Method; +import java.net.JarURLConnection; +import java.net.MalformedURLException; +import java.net.URL; +import java.net.URLClassLoader; +import java.util.Enumeration; +import java.util.jar.Attributes; +import java.util.jar.Manifest; +import java.util.StringTokenizer; +import java.util.ArrayList; +import java.security.AccessController; +import java.security.PrivilegedAction; + +/** + * This class can be used as a loader for application classes which use UNO. + * + * <p>The Loader class detects a UNO installation on the system and adds the + * UNO jar files to the search path of a customized class loader, which is used + * for loading the application classes.</p> + */ +public final class Loader { + + private static ClassLoader m_Loader = null; + + /** + * do not instantiate + */ + private Loader() {} + + /** + * The main method instantiates a customized class loader with the + * UNO jar files added to the search path and loads the application class, + * which is specified in the Main-Class attribute of the + * com/sun/star/lib/Loader.class entry of the manifest file or + * as first parameter in the argument list. + */ + public static void main( String[] arguments ) throws Exception { + + // get the name of the class to be loaded from the manifest + String className = null; + Class clazz = Loader.class; + ClassLoader loader = clazz.getClassLoader(); + ArrayList<URL> res = new ArrayList<URL>(); + try { + Enumeration<URL> en = loader.getResources( "META-INF/MANIFEST.MF" ); + while ( en.hasMoreElements() ) { + res.add( en.nextElement() ); + } + // the jarfile with the com/sun/star/lib/loader/Loader.class + // per-entry attribute is most probably the last resource in the + // list, therefore search backwards + for ( int i = res.size() - 1; i >= 0; i-- ) { + URL jarurl = res.get( i ); + try { + JarURLConnection jarConnection = + (JarURLConnection) jarurl.openConnection(); + Manifest mf = jarConnection.getManifest(); + Attributes attrs = (mf != null) ? mf.getAttributes( + "com/sun/star/lib/loader/Loader.class") : null; + if ( attrs != null ) { + className = attrs.getValue( "Application-Class" ); + if ( className != null ) + break; + } + } catch ( IOException e ) { + // if an I/O error occurs when opening a new + // JarURLConnection, ignore this manifest file + System.err.println( "com.sun.star.lib.loader.Loader::" + + "main: bad manifest file: " + e ); + } + } + } catch ( IOException e ) { + // if an I/O error occurs when getting the manifest resources, + // try to get the name of the class to be loaded from the argument + // list + System.err.println( "com.sun.star.lib.loader.Loader::" + + "main: cannot get manifest resources: " + e ); + } + + // if no manifest entry was found, get the name of the class + // to be loaded from the argument list + String[] args; + if ( className == null ) { + if ( arguments.length > 0 ) { + className = arguments[0]; + args = new String[arguments.length - 1]; + System.arraycopy( arguments, 1, args, 0, args.length ); + } else { + throw new IllegalArgumentException( + "The name of the class to be loaded must be either " + + "specified in the Main-Class attribute of the " + + "com/sun/star/lib/loader/Loader.class entry " + + "of the manifest file or as a command line argument." ); + } + } else { + args = arguments; + } + + // load the class with the customized class loader and + // invoke the main method + if ( className != null ) { + ClassLoader cl = getCustomLoader(); + Thread.currentThread().setContextClassLoader(cl); + Class c = cl.loadClass( className ); + @SuppressWarnings("unchecked") + Method m = c.getMethod( "main", new Class[] { String[].class } ); + m.invoke( null, new Object[] { args } ); + } + } + + /** + * Gets the customized class loader with the UNO jar files added to the + * search path. + * + * @return the customized class loader + */ + public static synchronized ClassLoader getCustomLoader() { + if ( m_Loader == null ) { + + // get the urls from which to load classes and resources + // from the class path + ArrayList<URL> vec = new ArrayList<URL>(); + String classpath = null; + try { + classpath = System.getProperty( "java.class.path" ); + } catch ( SecurityException e ) { + // don't add the class path entries to the list of class + // loader URLs + System.err.println( "com.sun.star.lib.loader.Loader::" + + "getCustomLoader: cannot get system property " + + "java.class.path: " + e ); + } + if ( classpath != null ) { + addUrls(vec, classpath, File.pathSeparator); + } + + // get the urls from which to load classes and resources + // from the UNO installation + String path = InstallationFinder.getPath(); + if ( path != null ) { + callUnoinfo(path, vec); + } else { + System.err.println( "com.sun.star.lib.loader.Loader::" + + "getCustomLoader: no UNO installation found!" ); + } + + // copy urls to array + final URL[] urls = new URL[vec.size()]; + vec.toArray( urls ); + + // instantiate class loader + m_Loader = AccessController.doPrivileged( + new PrivilegedAction<ClassLoader>() { + public ClassLoader run() { + return new CustomURLClassLoader(urls); + } + }); + } + + return m_Loader; + } + + private static void addUrls(ArrayList<URL> urls, String data, String delimiter) { + StringTokenizer tokens = new StringTokenizer( data, delimiter ); + while ( tokens.hasMoreTokens() ) { + try { + urls.add( new File( tokens.nextToken() ).toURI().toURL() ); + } catch ( MalformedURLException e ) { + // don't add this class path entry to the list of class loader + // URLs + System.err.println( "com.sun.star.lib.loader.Loader::" + + "getCustomLoader: bad pathname: " + e ); + } + } + } + + private static void callUnoinfo(String path, ArrayList<URL> urls) { + Process p; + try { + p = Runtime.getRuntime().exec( + new String[] { new File(path, "unoinfo").getPath(), "java" }); + } catch (IOException e) { + System.err.println( + "com.sun.star.lib.loader.Loader::getCustomLoader: exec" + + " unoinfo: " + e); + return; + } + new Drain(p.getErrorStream()).start(); + int code; + byte[] buf = new byte[1000]; + int n = 0; + try { + InputStream s = p.getInputStream(); + code = s.read(); + for (;;) { + if (n == buf.length) { + if (n > Integer.MAX_VALUE / 2) { + System.err.println( + "com.sun.star.lib.loader.Loader::getCustomLoader:" + + " too much unoinfo output"); + return; + } + byte[] buf2 = new byte[2 * n]; + System.arraycopy(buf, 0, buf2, 0, n); + buf = buf2; + } + int k = s.read(buf, n, buf.length - n); + if (k == -1) { + break; + } + n += k; + } + } catch (IOException e) { + System.err.println( + "com.sun.star.lib.loader.Loader::getCustomLoader: reading" + + " unoinfo output: " + e); + return; + } + int ev; + try { + ev = p.waitFor(); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + System.err.println( + "com.sun.star.lib.loader.Loader::getCustomLoader: waiting for" + + " unoinfo: " + e); + return; + } + if (ev != 0) { + System.err.println( + "com.sun.star.lib.loader.Loader::getCustomLoader: unoinfo" + + " exit value " + n); + return; + } + String s; + if (code == '0') { + s = new String(buf); + } else if (code == '1') { + try { + s = new String(buf, "UTF-16LE"); + } catch (UnsupportedEncodingException e) { + System.err.println( + "com.sun.star.lib.loader.Loader::getCustomLoader:" + + " transforming unoinfo output: " + e); + return; + } + } else { + System.err.println( + "com.sun.star.lib.loader.Loader::getCustomLoader: bad unoinfo" + + " output"); + return; + } + addUrls(urls, s, "\0"); + } + + private static final class Drain extends Thread { + public Drain(InputStream stream) { + super("unoinfo stderr drain"); + this.stream = stream; + } + + @Override + public void run() { + try { + while (stream.read() != -1) {} + } catch (IOException e) { /* ignored */ } + } + + private final InputStream stream; + } + + /** + * A customized class loader which is used to load classes and resources + * from a search path of user-defined URLs. + */ + private static final class CustomURLClassLoader extends URLClassLoader { + + public CustomURLClassLoader( URL[] urls ) { + super( urls ); + } + + @Override + protected Class<?> findClass( String name ) throws ClassNotFoundException { + // This is only called via this.loadClass -> super.loadClass -> + // this.findClass, after this.loadClass has already called + // super.findClass, so no need to call super.findClass again: + throw new ClassNotFoundException( name ); + } + + @Override + protected synchronized Class<?> loadClass( String name, boolean resolve ) + throws ClassNotFoundException + { + Class c = findLoadedClass( name ); + if ( c == null ) { + try { + c = super.findClass( name ); + } catch ( ClassNotFoundException e ) { + return super.loadClass( name, resolve ); + } catch ( SecurityException e ) { + // A SecurityException "Prohibited package name: java.lang" + // may occur when the user added the JVM's rt.jar to the + // java.class.path: + return super.loadClass( name, resolve ); + } + } + if ( resolve ) { + resolveClass( c ); + } + return c; + } + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |