Handler.java

package main;

import java.awt.Graphics;
import java.util.LinkedList;

/**
 * Adds, removes, and renders game objects within the game instance.
 */
public class Handler
{
	LinkedList<GameObject> objects = new LinkedList<GameObject>();

	private boolean up = false, down = false, right = false, left = false;
	private boolean upPriority = false, downPriority = false, rightPriority = false, leftPriority = false;

	/**
	 * Updates the game per frame by updating each game object.
	 */
	public void tick()
	{
		objects.parallelStream().forEach((object) ->
		{
			object.tick();
		});
	}

	/**
	 * Renders the graphics for each game object.
	 * 
	 * @param g
	 */
	public void render(Graphics g)
	{
		// objects.parallelStream().forEach((object) ->
		// {
		// object.render(g);
		// });

		// TODO Figure out how to safely iterate and modify in parallel stream

		for (int i = 0; i < objects.size(); i++)
		{
			GameObject tempObject = objects.get(i);

			tempObject.render(g);
		}
	}

	/**
	 * Adds the passed game object into game handler.
	 * 
	 * @param tempObject
	 */
	public void addObject(GameObject tempObject)
	{
		objects.add(tempObject);
	}

	/**
	 * Removes the game object from the game handler.
	 * 
	 * @param tempObject
	 */
	public void removeObject(GameObject tempObject)
	{
		objects.remove(tempObject);
	}

	// Getters and Setters//
	public boolean isUp()
	{
		return up;
	}

	public void setUp(boolean up)
	{
		this.up = up;
	}

	public boolean isDown()
	{
		return down;
	}

	public void setDown(boolean down)
	{
		this.down = down;
	}

	public boolean isRight()
	{
		return right;
	}

	public void setRight(boolean right)
	{
		this.right = right;
	}

	public boolean isLeft()
	{
		return left;
	}

	public void setLeft(boolean left)
	{
		this.left = left;
	}

	public boolean isUpPriority()
	{
		return upPriority;
	}

	public void setUpPriority(boolean upPriority)
	{
		this.upPriority = upPriority;
	}

	public boolean isDownPriority()
	{
		return downPriority;
	}

	public void setDownPriority(boolean downPriority)
	{
		this.downPriority = downPriority;
	}

	public boolean isRightPriority()
	{
		return rightPriority;
	}

	public void setRightPriority(boolean rightPriority)
	{
		this.rightPriority = rightPriority;
	}

	public boolean isLeftPriority()
	{
		return leftPriority;
	}

	public void setLeftPriority(boolean leftPriority)
	{
		this.leftPriority = leftPriority;
	}
}