public void addCategoryMonitor(MeemPath meemPath, CategoryMonitor categoryMonitor) {
LinkedList<String> paths = new LinkedList<String>();
String space = meemPath.getSpace().getType();
String location = meemPath.getLocation();
StringTokenizer tok = new StringTokenizer(location, "/");
while (tok.hasMoreTokens()) {
paths.add(tok.nextToken());
}
// start with the space
CategoryMonitorMapPair spaceMonitorMapPair = null;
synchronized (monitoredSpaces) {
spaceMonitorMapPair = (CategoryMonitorMapPair) monitoredSpaces.get(space);
if (spaceMonitorMapPair == null) {
// The only time this is ok is if the paths list is empty
if (paths.size() == 0) {
spaceMonitorMapPair = new CategoryMonitorMapPair(categoryMonitor);
monitoredSpaces.put(space, spaceMonitorMapPair);
// we are done
return;
} else {
throw new RuntimeException("Tried to add a MeemPath with a previously unseen space type");
}
}
}
Map<String, CategoryMonitorMapPair> children = spaceMonitorMapPair.getChildren();
CategoryMonitorMapPair pair = spaceMonitorMapPair;
for (int i = 0; i < paths.size() - 1; i++) {
String pathName = (String) paths.get(i);
pair = children.get(pathName);
if (pair != null) {
children = pair.getChildren();
} else {
throw new RuntimeException(
"Tried to add a MeemPath whose parents are not being watched: " + meemPath);
}
}
// we should now have the new category watchers parent pair
String pathName = (String) paths.get(paths.size() - 1);
pair.addChild(pathName, categoryMonitor);
}
public CategoryMonitorMapPair getCategoryMonitorMapPair(MeemPath meemPath) {
List<String> paths = new LinkedList<String>();
String space = meemPath.getSpace().getType();
String location = meemPath.getLocation();
StringTokenizer tok = new StringTokenizer(location, "/");
while (tok.hasMoreTokens()) {
paths.add(tok.nextToken());
}
CategoryMonitorMapPair spaceMonitorMapPair =
(CategoryMonitorMapPair) monitoredSpaces.get(space);
if (spaceMonitorMapPair == null) {
// not watching this space type. return straight away
return null;
}
if (paths.size() == 0) {
// if this is the case, we are just looking at the space
return spaceMonitorMapPair;
}
Map<String, CategoryMonitorMapPair> children = spaceMonitorMapPair.getChildren();
for (int i = 0; i < paths.size() - 1; i++) {
String pathName = (String) paths.get(i);
CategoryMonitorMapPair pair = (CategoryMonitorMapPair) children.get(pathName);
if (pair != null) {
children = pair.getChildren();
} else {
return null;
}
}
String pathName = (String) paths.get(paths.size() - 1);
return (CategoryMonitorMapPair) children.get(pathName);
}
public void removeMeemPath(MeemPath meemPath) {
List<String> paths = new LinkedList<String>();
String space = meemPath.getSpace().getType();
String location = meemPath.getLocation();
StringTokenizer tok = new StringTokenizer(location, "/");
while (tok.hasMoreTokens()) {
paths.add(tok.nextToken());
}
// go thru all the category watchers in the meempath and remove this meempath from their list of
// paths to watch
if (paths.size() > 0) {
CategoryMonitorMapPair spaceMonitorMapPair =
(CategoryMonitorMapPair) monitoredSpaces.get(space);
spaceMonitorMapPair
.getCategoryMonitor()
.removeWatchedMeemPath((String) paths.get(0), meemPath);
Map<String, CategoryMonitorMapPair> children = spaceMonitorMapPair.getChildren();
for (int i = 0; i < paths.size() - 1; i++) {
String pathName = (String) paths.get(i);
String nextPathName = (String) paths.get(i + 1);
CategoryMonitorMapPair pair = (CategoryMonitorMapPair) children.get(pathName);
if (pair != null) {
pair.getCategoryMonitor().removeWatchedMeemPath(nextPathName, meemPath);
children = pair.getChildren();
}
}
}
}
