CameraSystem.java

package com.javamarcher.systems;
import java.util.HashMap;
import java.util.Map;

import at.fhooe.mtd.ecs.EngineSystem;

public class CameraSystem extends EngineSystem {
	private final Map<String, Camera> cameras = new HashMap<>();
	
	public CameraSystem() {
	}
	
	public CameraSystem(boolean addDefaultCamera) {
		if(addDefaultCamera) {
			getDefaultCamera();
		}
	}
	
	@Override
	public void update(double dt) {
		for(Camera c : cameras.values()) {
			c.update(dt);
		}
	}
	
	public Camera createCamera(String cameraName) {
		final Camera c = new Camera();
		cameras.put(cameraName, c);
		return c;
	}
	
	public Camera getOrCreateCamera(String cameraName) {
		Camera c = cameras.get(cameraName);
		
		if(c == null) {
			c = createCamera(cameraName);
		}
		return c;
	}
	
	/**
	 * Returns the default camera with the {@link CameraType} main camera.
	 * If the camera is not found, it will be created. 
	 */
	public Camera getDefaultCamera() {
		return getOrCreateCamera(CameraType.MAIN_CAMERA.toString());
	}
	
	public Camera getCamera(String cameraName) {
		if(hasCamera(cameraName)) {
			return cameras.get(cameraName);
		}
		return null;
	}
	
	public boolean hasCamera(String cameraName) {
		final Camera c = cameras.get(cameraName);

		if(c == null) { 
			return false;
		}
		return true;
	}
	
	public void removeCamera(String cameraName) {
		cameras.remove(cameraName);
	}
	
	public void removeAll() {
		cameras.clear();
	}
}