refactoring: PropertyChangeSupport in Player

src/main/java/de/hsfulda/onses/models/Player.java

@@ -2,9 +2,13 @@ package de.hsfulda.onses.models;
 
 import de.hsfulda.onses.services.PlayerService;
 
+import java.beans.PropertyChangeSupport;
 import java.util.ArrayList;
 
 public class Player {
+    public final static String PROPERTY_PLAYER_DECK = "playerDeck";
+
+    protected PropertyChangeSupport listeners;
 
     private PlayerService playerService;
     private Game game;
@@ -15,11 +19,11 @@ public class Player {
     }
 
     public void addCardToPlayerDeck(Card card) {
+        final ArrayList<Card> oldplayerDeck = new ArrayList<>(this.playerDeck);
         playerDeck.add(card);
+        this.firePropertyChange(PROPERTY_PLAYER_DECK, oldplayerDeck, playerDeck);
     }
 
-
-
     public PlayerService getPlayerService() {
         return playerService;
     }
@@ -37,4 +41,19 @@ public class Player {
         this.game = game;
         return this;
     }
+
+    public PropertyChangeSupport listeners() {
+        if(this.listeners == null) {
+            this.listeners = new PropertyChangeSupport(this);
+        }
+        return this.listeners;
+    }
+
+    public boolean firePropertyChange(String propertyName, Object oldValue, Object newValue) {
+        if (this.listeners != null) {
+            this.listeners.firePropertyChange(propertyName, oldValue, newValue);
+            return true;
+        }
+        return false;
+    }
 }