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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: Loader.java,v $
*
* $Revision: 1.4 $
*
* last change: $Author: rt $ $Date: 2005-09-07 20:18:33 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 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
*
************************************************************************/
package com.sun.star.lib.loader;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
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.Vector;
/**
* 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();
Vector res = new Vector();
try {
Enumeration en = loader.getResources( "META-INF/MANIFEST.MF" );
while ( en.hasMoreElements() ) {
res.add( (URL) 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 = (URL) res.elementAt( i );
try {
JarURLConnection jarConnection =
(JarURLConnection) jarurl.openConnection();
Manifest mf = jarConnection.getManifest();
Attributes attrs = (Attributes) mf.getAttributes(
"com/sun/star/lib/loader/Loader.class" );
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();
Class c = cl.loadClass( className );
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() {
final String CLASSESDIR = "classes";
final String JUHJAR = "juh.jar";
if ( m_Loader == null ) {
// get the urls from which to load classes and resources
// from the class path
Vector vec = new Vector();
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 ) {
StringTokenizer tokens = new StringTokenizer( classpath,
File.pathSeparator );
while ( tokens.hasMoreTokens() ) {
try {
vec.add( new File( tokens.nextToken() ).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 java.class.path: " + e );
}
}
}
// get the urls from which to load classes and resources
// from the UNO installation
String path = InstallationFinder.getPath();
if ( path != null ) {
File fClassesDir = new File( path, CLASSESDIR );
File fJuh = new File( fClassesDir, JUHJAR );
URL[] clurls = new URL[1];
try {
clurls[0] = fJuh.toURL();
ClassLoader cl = new CustomURLClassLoader( clurls );
Class c = cl.loadClass(
"com.sun.star.comp.helper.UnoInfo" );
Method m = c.getMethod( "getJars", (Class[]) null );
URL[] jarurls = (URL[]) m.invoke( null, (Object[]) null );
for ( int i = 0; i < jarurls.length; i++ ) {
vec.add( jarurls[i] );
}
} catch ( MalformedURLException e ) {
// don't add the UNO jar files to the list of class loader
// URLs
System.err.println( "com.sun.star.lib.loader.Loader::" +
"getCustomLoader: cannot add UNO jar files: " + e );
} catch ( ClassNotFoundException e ) {
// don't add the UNO jar files to the list of class loader
// URLs
System.err.println( "com.sun.star.lib.loader.Loader::" +
"getCustomLoader: cannot add UNO jar files: " + e );
} catch ( NoSuchMethodException e ) {
// don't add the UNO jar files to the list of class loader
// URLs
System.err.println( "com.sun.star.lib.loader.Loader::" +
"getCustomLoader: cannot add UNO jar files: " + e );
} catch ( IllegalAccessException e ) {
// don't add the UNO jar files to the list of class loader
// URLs
System.err.println( "com.sun.star.lib.loader.Loader::" +
"getCustomLoader: cannot add UNO jar files: " + e );
} catch ( InvocationTargetException e ) {
// don't add the UNO jar files to the list of class loader
// URLs
System.err.println( "com.sun.star.lib.loader.Loader::" +
"getCustomLoader: cannot add UNO jar files: " + e );
}
} else {
System.err.println( "com.sun.star.lib.loader.Loader::" +
"getCustomLoader: no UNO installation found!" );
}
// copy urls to array
URL[] urls = new URL[vec.size()];
vec.toArray( urls );
// instantiate class loader
m_Loader = new CustomURLClassLoader( urls );
}
return m_Loader;
}
/**
* 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 );
}
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 );
}
protected 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;
}
}
}
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