public TriggetPhase {

	public enum ContextPhase {
		AFTER, BEFORE
	}

	public enum ContextOperation {
		INSERT, UPDATE, DELETE, UNDELETE
	}

	public ContextPhase phase {
		get {
			if (phase == null) {
				if (Trigger.isBefore) {
					phase = ContextPhase.BEFORE;
				} else if (Trigger.isAfter) {
					phase = ContextPhase.AFTER;
				}
			}
		}

		private set;
	}

	public ContextOperation operation {
		get {
			if (operation == null) {
				if (Trigger.isInsert) {
					operation = ContextOperation.INSERT;
				} else if (Trigger.isUpdate) {
					operation = ContextOperation.UPDATE;
				} else if (Trigger.isDelete) {
					operation = ContextOperation.DELETE;
				} else if (Trigger.isUndelete) {
					operation = ContextOperation.UNDELETE;
				}
			}
		}

		private set;
	}

	.....

}

public TriggerControlService {

	public void execute(...) {

		...
		try {

			checkContext();

			if (triggerPhase.phase == TriggetPhase.ContextPhase.BEFORE) {

			} else if (triggerPhase.phase == TriggetPhase.ContextPhase.AFTER) {

			}
		} catch (Exception e) {
			System.debug(LoggingLevel.Error, '');
		}

		...
	}

	private void checkContext() {
		if (triggerPhase.phase == null
			|| triggerPhase.operation == null) {

			throw new TriggerControlException('This context is not a trigger context');
		}
	}

	private void performBefore(...) {
		if (triggerPhase.operation == TriggetPhase.ContextOperation.INSERT) {

		} else if (triggerPhase.operation == TriggetPhase.ContextOperation.UPDATE) {
		} ...
	}

}