Initial import.

src/ei/engine/state/GameStateManager.java

@@ -0,0 +1,131 @@
+package ei.engine.state;
+
+import java.util.ArrayList;
+
+public class GameStateManager {
+	private static GameStateManager instance;
+	private ArrayList<GameState> gameStates;
+	
+	private GameStateManager(){
+		gameStates = new ArrayList<GameState>();
+	}
+	
+	/**
+	 * Add A GameState to the GameStateManager
+	 * @param g The GameState to add
+	 * @return true if successful else false
+	 */
+	public boolean addState(GameState g){
+		if(!gameStates.contains(g)){
+			gameStates.add(g);
+			return true;
+		}
+		return false;
+	}
+	
+	/**
+	 * Remove a GameState from the GameStateManager
+	 * @param g The state to remove
+	 * @return true if successful else false
+	 */
+	public boolean removeState(GameState g){
+		if(gameStates.contains(g)){
+			gameStates.remove(g);
+			return true;
+		}
+		return false;
+	}
+	
+	/**
+	 * Removes a GameState by its name
+	 * @param name the name of the GameState to remove
+	 * @return true if successful else false
+	 */
+	public boolean removeStateByName(String name){
+		int i = getId(name);
+		if(i >= 0){
+			gameStates.remove(i);
+			return true;
+		}
+		return false;
+	}
+	
+	/**
+	 * Returns the GameState in GameStateManager whit the given name
+	 * @param name the name of the GameState
+	 * @return the GameState by the name else null
+	 */
+	public GameState getState(String name){
+		int i = getId(name);
+		if(i >= 0){
+			gameStates.get(i);
+		}
+		return null;
+	}
+	
+	/**
+	 * Activates a GameState by the name
+	 * @param name the name of the GameState
+	 * @return true if successful else false
+	 */
+	public boolean setActive(String name){
+		GameState g = getState(name);
+		if(g != null){
+			g.setEnabled(true);
+			return true;
+		}
+		return false;
+	}
+	
+	/**
+	 * Deactivates a GameState by the name
+	 * @param name the name of the GameState
+	 * @return true if successful else false
+	 */
+	public boolean setDeActive(String name){
+		GameState g = getState(name);
+		if(g != null){
+			g.setEnabled(false);
+			return true;
+		}
+		return false;
+	}
+	
+	private int getId(String name){
+		for(int i=0; i<gameStates.size() ;i++){
+			if(gameStates.get(i).getName().equals(name)){
+				return i;
+			}
+		}
+		return -1;
+	}
+	
+	/**
+	 * updates all the active GameStates
+	 */
+	public void update(){
+		for(int i=0; i<gameStates.size() ;i++){
+			if(gameStates.get(i).isEnabled()){
+				gameStates.get(i).update();
+			}
+		}
+	}
+	
+	/**
+	 * renders all the active GameStates
+	 */
+	public void render(){
+		for(int i=0; i<gameStates.size() ;i++){
+			if(gameStates.get(i).isEnabled()){
+				gameStates.get(i).render();
+			}
+		}
+	}
+	
+	public static GameStateManager getInstance(){
+		if(instance == null){
+			instance = new GameStateManager();
+		}
+		return instance;
+	}
+}