/**
* Creates a new URLClassPath for the given URLs. The URLs will be searched in the order specified
* for classes and resources. A URL ending with a '/' is assumed to refer to a directory.
* Otherwise, the URL is assumed to refer to a JAR file.
*
* @param urls the directory and JAR file URLs to search for classes and resources
* @param factory the URLStreamHandlerFactory to use when creating new URLs
*/
public URLClassPath(URL[] urls, URLStreamHandlerFactory factory) {
for (int i = 0; i < urls.length; i++) {
path.add(urls[i]);
}
push(urls);
if (factory != null) {
jarHandler = factory.createURLStreamHandler("jar");
}
}
/*
* Returns the Loader at the specified position in the URL search
* path. The URLs are opened and expanded as needed. Returns null
* if the specified index is out of range.
*/
private synchronized Loader getLoader(int index) {
// Expand URL search path until the request can be satisfied
// or the URL stack is empty.
while (loaders.size() < index + 1) {
// Pop the next URL from the URL stack
URL url;
synchronized (urls) {
if (urls.empty()) {
return null;
} else {
url = (URL) urls.pop();
}
}
// Skip this URL if it already has a Loader. (Loader
// may be null in the case where URL has not been opened
// but is referenced by a JAR index.)
if (lmap.containsKey(url)) {
continue;
}
// Otherwise, create a new Loader for the URL.
Loader loader;
try {
loader = getLoader(url);
// If the loader defines a local class path then add the
// URLs to the list of URLs to be opened.
URL[] urls = loader.getClassPath();
if (urls != null) {
push(urls);
}
} catch (IOException e) {
// Silently ignore for now...
continue;
}
// Finally, add the Loader to the search path.
loaders.add(loader);
lmap.put(url, loader);
}
return (Loader) loaders.get(index);
}