refactor

src/main/java/com/softwarerat/API/data/gameState/GameStateManager.java

@@ -0,0 +1,39 @@
+package com.softwarerat.API.data.gameState;
+
+import java.util.Arrays;
+
+public class GameStateManager {
+    
+
+
+    private final IGameState[] gameStates;
+  
+  private int currentStateId;
+  
+  public GameStateManager(IGameState... gameStates) {
+    this.gameStates = gameStates;
+  }
+  
+  public IGameState getCurrentState() {
+    if (this.currentStateId < 0 || this.currentStateId >= this.gameStates.length)
+      return null; 
+    return this.gameStates[this.currentStateId];
+  }
+  
+  public IGameState nextState() {
+    if (this.currentStateId + 1 == this.gameStates.length)
+      throw new IllegalStateException("No states remaining"); 
+    
+    IGameState oldState = getCurrentState();
+    this.currentStateId++;
+    IGameState newState = getCurrentState();
+    oldState.Stop();
+    newState.Start(this);
+    return newState;
+  }
+  
+  @SafeVarargs
+  public final boolean isCurrentGameState(Class<? extends IGameState>... states) {
+    return Arrays.<Class<? extends IGameState>>stream(states).anyMatch(state -> state.isInstance(getCurrentState()));
+  }
+}