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package org.netbeans.modules.javahelp;
import java.util.ConcurrentModificationException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import org.netbeans.api.javahelp.Help;
import org.openide.modules.ModuleInstall;
public class Installer extends ModuleInstall {
public static final Logger log = Logger.getLogger("org.netbeans.modules.javahelp"); // NOI18N
public static final Logger UI = Logger.getLogger("org.netbeans.ui.javahelp"); // NOI18N
public void restored() {
log.fine("restored module");
// This ensures the static block will be called ASAP, hence that
// the AWT listener will actually be started quickly and there
// will already have been interesting mouse-entered events
// by the time F1 is first pressed. Otherwise only the second
// F1 actually gets anything other than the main window help.
HelpAction.WindowActivatedDetector.install();
// XXX(-ttran) quick fix for #25470: Help viewer frozen on first open
// over modal dialogs. JavaHelp seems to try to be lazy with the
// installation of its Dialog detector (an AWTEventListener) but it
// doesn't work on Windows. Here we force JavaHelp instance to be
// created and thus its AWTEventListener be registered early enough.
getDefaultHelp();
}
public void uninstalled() {
log.fine("uninstalled module");
if (help != null) {
help.deactivate();
}
HelpAction.WindowActivatedDetector.uninstall();
// UIManager is too aggressive about caching, and we get CCE's,
// since JavaHelp's HelpUtilities sets up these defaults, and UIManager
// caches the actual classes (probably incorrectly). #4675772
cleanDefaults(UIManager.getDefaults());
cleanDefaults(UIManager.getLookAndFeelDefaults());
}
private static void cleanDefaults(UIDefaults d) {
Set<Object> badKeys = new HashSet<Object>(10);
Iterator<Map.Entry<Object, Object>> it = d.entrySet().iterator();
ClassLoader aboutToDie = Installer.class.getClassLoader();
while (it.hasNext()) {
Map.Entry<Object, Object> e;
try {
e = it.next();
} catch (ConcurrentModificationException x) {
// Seems to be possible during shutdown. Just skip the hack in this case.
return;
}
Object k = e.getKey();
Object o = e.getValue();
if (o instanceof Class) {
Class c = (Class)o;
if (c.getClassLoader() == aboutToDie) {
badKeys.add(k);
}
} else if (k instanceof Class) {
Class c = (Class)k;
if (c.getClassLoader() == aboutToDie) {
badKeys.add(k);
}
}
}
if (!badKeys.isEmpty()) {
log.fine("Cleaning up old UIDefaults keys (JRE bug #4675772): " + badKeys);
for (Object o: badKeys) {
d.put(o, null);
}
}
}
private static JavaHelp help = null;
/** @deprecated only for use from the layer */
public static synchronized Help getDefaultHelp() {
// Does not work to use Lookup: help set processors called too early.
if (help == null) {
help = new JavaHelp();
}
return help;
}
}
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