AsyncEffectUtility.java

import org.bukkit.event.Event;

import ch.njol.skript.Skript;
import ch.njol.skript.effects.Delay;
import ch.njol.skript.lang.Effect;
import ch.njol.skript.lang.TriggerItem;
import ch.njol.skript.variables.Variables;

/**
 * This is *not* similar to Skript's AsyncEffect class.
 * This just provides some utility for local variable stuff.
 * Only the delay stuff works if the Variables methods aren't available.
 *
 * @author Blueyescat <https://github.com/Blueyescat>
 */
public abstract class AsyncEffectUtility extends Effect {

	private static boolean CAN_MANAGE_LOCAL_VARS = Skript.methodExists(Variables.class, "removeLocals", Event.class) &&
			Skript.methodExists(Variables.class, "setLocalVariables", Event.class, Object.class);

	private Object localVars;

	@Override
	protected TriggerItem walk(Event e) {
		debug(e, true);
		Delay.addDelayedEvent(e);
		execute(e);
		return null;
	}

	protected void removeAndSaveLocals(Event e) {
		if (CAN_MANAGE_LOCAL_VARS)
			localVars = Variables.removeLocals(e);
	}

	protected void putLocalsBack(Event e) {
		if (CAN_MANAGE_LOCAL_VARS && localVars != null)
			Variables.setLocalVariables(e, localVars);
	}

	protected boolean shouldContinue() {
		return getNext() != null;
	}

	protected void continueTrigger(Event e) {
		TriggerItem.walk(getNext(), e);
	}

	protected void continueTriggerAndRemoveLocals(Event e) {
		continueTrigger(e);
		if (CAN_MANAGE_LOCAL_VARS)
			Variables.removeLocals(e);
	}

	protected void putLocalsBackAndContinueTrigger(Event e) {
		if (CAN_MANAGE_LOCAL_VARS)
			putLocalsBack(e);
		continueTrigger(e);
	}

}