/**
* Registers a command with the given name is possible. Also uses fallbackPrefix to create a
* unique name.
*
* @param label the name of the command, without the '/'-prefix.
* @param command the command to register
* @param isAlias whether the command is an alias
* @param fallbackPrefix a prefix which is prepended to the command for a unique address
* @return true if command was registered, false otherwise.
*/
private synchronized boolean register(
String label, Command command, boolean isAlias, String fallbackPrefix) {
knownCommands.put(fallbackPrefix + ":" + label, command);
if ((command instanceof VanillaCommand || isAlias) && knownCommands.containsKey(label)) {
// Request is for an alias/fallback command and it conflicts with
// a existing command or previous alias ignore it
// Note: This will mean it gets removed from the commands list of active aliases
return false;
}
boolean registered = true;
// If the command exists but is an alias we overwrite it, otherwise we return
Command conflict = knownCommands.get(label);
if (conflict != null && conflict.getLabel().equals(label)) {
return false;
}
if (!isAlias) {
command.setLabel(label);
}
knownCommands.put(label, command);
return registered;
}
/** {@inheritDoc} */
public boolean register(String label, String fallbackPrefix, Command command) {
label = label.toLowerCase().trim();
fallbackPrefix = fallbackPrefix.toLowerCase().trim();
boolean registered = register(label, command, false, fallbackPrefix);
Iterator<String> iterator = command.getAliases().iterator();
while (iterator.hasNext()) {
if (!register(iterator.next(), command, true, fallbackPrefix)) {
iterator.remove();
}
}
// If we failed to register under the real name, we need to set the command label to the direct
// address
if (!registered) {
command.setLabel(fallbackPrefix + ":" + label);
}
// Register to us so further updates of the commands label and aliases are postponed until its
// reregistered
command.register(this);
return registered;
}