java-design-patterns/proxy/src/main/java/com/iluwatar/WizardTowerProxy.java

package com.iluwatar;

/**
 * 
 * The proxy controlling access to WizardTower.
 * 
 */
public class WizardTowerProxy extends WizardTower {

	private static final int NUM_WIZARDS_ALLOWED = 3;

	private int numWizards;

	@Override
	public void enter(Wizard wizard) {
		if (numWizards < NUM_WIZARDS_ALLOWED) {
			super.enter(wizard);
			numWizards++;
		} else {
			System.out.println(wizard + " is not allowed to enter!");
		}
	}
}