Merge branch '4349' into 'master'

4349

Closes af3#4349

See merge request !221

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/extension/data/.ratings

@@ -8,7 +8,7 @@ LogMessage.java 14204ed9d51b356f50be52362247cfbbe0cbd5c7 GREEN
 ModelElementTransformationContext.java 5a41bd3a75ce434c3174d50d2fdfab28b66f09f2 GREEN
 ModelStorageError.java 2aef480044047e960e64811111a7f27310011cc2 GREEN
 Prototype.java f4b13f86b7511edacc138053ffb80cecbac70868 GREEN
-PrototypeCategory.java ca500b4816ed42b9536488669aeab89561d2f08c GREEN
+PrototypeCategory.java 6aa849290948b1fd9608ad06d7cca2ec6ff76805 GREEN
 TransformationProviderChain.java 67ec6d0b4c23d295323572649606d79f3b897437 GREEN
 TutorialAtomicStep.java 09c0d6597d542b431b5bbdc790ee9e533d9f77fb GREEN
 TutorialCompositeStep.java cc61c2e86eff310762acac4d023fd709507355c8 GREEN

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/extension/data/PrototypeCategory.java

@@ -16,7 +16,9 @@
 package org.fortiss.tooling.kernel.extension.data;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 /**
  * Container object for prototypes of a certain category.
@@ -37,8 +39,8 @@ public class PrototypeCategory {
 	/** Stores the prototypes affiliated with this category. */
 	private List<Prototype> children = new ArrayList<Prototype>();
 
-	/** Stores the sub-categories of this category. */
-	private List<PrototypeCategory> subCategories = new ArrayList<PrototypeCategory>();
+	/** Stores the unique sub-categories of this category. */
+	private Set<PrototypeCategory> subCategories = new HashSet<PrototypeCategory>();
 
 	/** Constructor. */
 	public PrototypeCategory(String category) {
@@ -102,4 +104,10 @@ public class PrototypeCategory {
 	public String toString() {
 		return "Prototype category: " + categoryName;
 	}
+
+	/** {@inheritDoc} */
+	@Override
+	public int hashCode() {
+		return getName().hashCode();
+	}
 }