first version of pattern without Tests

extension-objects/src/main/java/units/CommanderUnit.java

@@ -0,0 +1,30 @@
+package units;
+
+import abstractextensions.CommanderExtension;
+import abstractextensions.UnitExtension;
+import concreteextensions.Commander;
+
+/**
+ * Created by Srdjan on 27-Apr-17.
+ */
+public class CommanderUnit extends Unit {
+
+  private CommanderExtension commanderExtension;
+
+  public CommanderUnit(String name) {
+    super(name);
+  }
+
+  @Override
+  public UnitExtension getUnitExtension(String extensionName) {
+
+    if (extensionName.equals("CommanderExtension")) {
+      if (commanderExtension == null) {
+        commanderExtension = new Commander(this);
+      }
+      return commanderExtension;
+    }
+
+    return super.getUnitExtension(extensionName);
+  }
+}

extension-objects/src/main/java/units/SergeantUnit.java

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+package units;
+
+import abstractextensions.SergeantExtension;
+import abstractextensions.UnitExtension;
+import concreteextensions.Sergeant;
+
+/**
+ * Created by Srdjan on 27-Apr-17.
+ */
+public class SergeantUnit extends Unit {
+
+  private SergeantExtension sergeantExtension;
+
+  public SergeantUnit(String name) {
+    super(name);
+  }
+
+  @Override
+  public UnitExtension getUnitExtension(String extensionName) {
+
+    if (extensionName.equals("SergeantExtension")) {
+      if (sergeantExtension == null) {
+        sergeantExtension = new Sergeant(this);
+      }
+      return sergeantExtension;
+    }
+
+    return super.getUnitExtension(extensionName);
+  }
+}

extension-objects/src/main/java/units/SoldierUnit.java

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+package units;
+
+import abstractextensions.SoldierExtension;
+import abstractextensions.UnitExtension;
+import concreteextensions.Soldier;
+
+/**
+ * Created by Srdjan on 26-Apr-17.
+ */
+public class SoldierUnit extends Unit {
+
+  private SoldierExtension soldierExtension;
+
+  public SoldierUnit(String name) {
+    super(name);
+  }
+
+  @Override
+  public UnitExtension getUnitExtension(String extensionName) {
+
+    if (extensionName.equals("SoldierExtension")) {
+      if (soldierExtension == null) {
+        soldierExtension = new Soldier(this);
+      }
+
+      return soldierExtension;
+    }
+    return super.getUnitExtension(extensionName);
+  }
+}

extension-objects/src/main/java/units/Unit.java

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+package units;
+
+import abstractextensions.UnitExtension;
+
+/**
+ * Created by Srdjan on 26-Apr-17.
+ */
+public class Unit {
+
+  private String name;
+
+  public Unit(String name) {
+    this.name = name;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public UnitExtension getUnitExtension(String extensionName) {
+    return null;
+  }
+}