/**
* Determine if the channel is enabled.
*
* <p>Checks all groups to which the channel belongs. If they're all disabled, so is the channel.
*/
final void computeEnablement() {
// 'Active' channels always stay enabled
if (enablement != Enablement.Passive) return;
for (ArchiveGroup group : groups) {
if (group.isEnabled()) { // Found at least one enabled group
updateEnabledState(true);
return;
}
}
// else: All groups are disabled
updateEnabledState(false);
}
/** Enable or disable groups based on received value */
private final void handleEnablement(final VType value) {
if (enablement == Enablement.Passive)
throw new Error("Not to be called when passive"); // $NON-NLS-1$
// Get boolean value (true <==> >0.0)
final double number = VTypeHelper.toDouble(value);
final boolean yes = number > 0.0;
// Do we enable or disable based on that value?
final boolean enable = enablement == Enablement.Enabling ? yes : !yes;
// Check which group needs to _change_
for (ArchiveGroup group : groups) {
if (group.isEnabled() != enable) group.enable(enable);
}
}
/** Tell channel that it no longer belogs to group */
final void removeGroup(final ArchiveGroup group) {
if (!groups.remove(group))
throw new Error("Channel " + getName() + " doesn't belong to group" + group.getName());
}
