This is a multi-post question, please bear with me...
Please consider the justification for an acknowledged "dirty hack" and
its controversial code below.
My actual question will be in my next message.
-Ramon
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Working with bootstraps.
The OpenOffice.org Java API has its own methods for bootstrapping
OpenOffice.org. By "bootstrapping" OpenOffice.org, we simply mean
"starting up" or "launching" the OpenOffice.org application launcher.
This is done by finding the location of the juh.jar library and looking
for the soffice(.exe) executable in that location, or in one directory
above that location. This requires the juh.jar library to be put on the
CLASSPATH, enabling the application that you create in this tutorial to
find it. However, here we want to ship our own juh.jar file (and others)
with the application. In this case, this approach to the bootstrapping
mechanism doesn't work.
In order to solve this issue, there are two possibilities. First, it is
possible to make sure that Java can find the soffice(.exe) executable
every time. This can be done by putting the directory containing the
executable on the PATH in Windows, or on LD_LIBRARY_PATH in Mac, Unix,
and Linux. This requires action from potential users and we want to
prevent that.
So we choose the second possibility, which involves working with access
modifiers. In the Sun JDK, the system ClassLoader is an instance of the
class URLClassLoader. This class has a private method called addURL,
which is called when Java starts and which will add all JARs and other
resources needed. Using Reflection, we request an instance of the
URLClassLoader, make the addURL method accessible to us, and add the
directory containing the soffice(.exe) executable to the stack of URLs
in the URLClassLoader. It is a dirty hack, but it works.
-----------------
and this is the questioned code:
-----------------
public Object simpleBootstrap
(String pathToExecutable) throws Exception {
//Get the executable from the incoming String:
String ooBaseDirectory =
pathToExecutable.replaceAll("soffice(.exe){0,1}$","");
System.out.println("Your ooBaseDir is: " + ooBaseDirectory);
ClassLoader loader = ClassLoader.getSystemClassLoader();
if (loader instanceof URLClassLoader) {
URLClassLoader cl = (URLClassLoader)loader;
Class sysclass = URLClassLoader.class;
try {
Method method = sysclass.getDeclaredMethod("addURL", new
Class[]{URL.class});
method.setAccessible(true);
method.invoke(cl, new Object[]{new
File(ooBaseDirectory).toURL()});
} catch (Throwable t) {
t.printStackTrace();
throw new IOException("Error, could not add URL to system
classloader");
}
} else {
System.out.println("Error occured, URLClassLoader expected but " +
loader.getClass() + " received. Could not continue.");
}
(If you are inside an IDE, you don't need any of the above "dirty hack",
you only need the line below):
//Get the office component context:
XComponentContext xContext = Bootstrap.bootstrap();
-Ramon
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