private void addNewDependency(
String id, String version, int match, List preservedImports, List newImports)
throws CoreException {
if (findFeaturePlugin(id, version, match) != null) {
// don't add imports to local plug-ins
return;
}
if (findImport(preservedImports, id, version, match) != null) {
// already seen
return;
}
if (findImport(newImports, id, version, match) != null) {
// already seen
return;
}
IFeatureImport iimport = findImport(fImports, id, version, match);
if (iimport != null) {
// import still valid
preservedImports.add(iimport);
return;
}
// a new one is needed
iimport = getModel().getFactory().createImport();
iimport.setId(id);
iimport.setVersion(version);
iimport.setMatch(match);
((FeatureImport) iimport).setInTheModel(true);
newImports.add(iimport);
}
/**
* Finds a given import in the list
*
* @param imports list of imports
* @param id
* @param version
* @param match
* @return IFeatureImport or null
*/
private IFeatureImport findImport(List imports, String id, String version, int match) {
for (int i = 0; i < imports.size(); i++) {
IFeatureImport iimport = (IFeatureImport) imports.get(i);
if (iimport.getId().equals(id)) {
if (version == null) return iimport;
if (version.equals(iimport.getVersion()) && match == iimport.getMatch()) return iimport;
}
}
return null;
}
/*
* returns true if this thread can obtain the global lock or already has the lock;
* otherwise this loader and thread are added to the waitingList
*/
private static synchronized boolean tryLock(Thread currentThread, Object loader) {
if (lockThread == currentThread) {
lockCount++;
return true;
}
if (lockThread == null) {
lockCount++;
lockThread = currentThread;
return true;
}
waitingList.add(new Object[] {currentThread, loader});
return false;
}
/*
* unlocks the global lock and notifies the first waiting thread that they
* now have the lock
*/
private static void unlock() {
Thread waitingThread = null;
Object loader = null;
synchronized (BundleLoader.class) {
lockCount--;
if (lockCount != 0) return;
if (waitingList.isEmpty()) {
lockThread = null;
return;
}
Object[] waiting = (Object[]) waitingList.get(0);
waitingThread = (Thread) waiting[0];
loader = waiting[1];
}
synchronized (loader) {
synchronized (BundleLoader.class) {
lockThread = waitingThread;
waitingList.remove(0);
loader.notifyAll();
}
}
}