Add possibility to unregister namespaces from ContextManager

DEVSIX-5795

Autoported commit.
Original commit hash: [96c7ed6d4]

Author: Snipx

itext.tests/itext.commons.tests/itext/commons/actions/contexts/ContextManagerTest.cs

@@ -75,8 +75,19 @@ public virtual void GetRecognisedNamespaceForSpecificNamespaceTest() {
         [NUnit.Framework.Test]
         public virtual void NotRegisteredNamespaceTest() {
             String notRegisteredNamespace = "com.hello.world";
-            NUnit.Framework.Assert.AreEqual(null, ContextManager.GetInstance().GetRecognisedNamespace(notRegisteredNamespace
+            NUnit.Framework.Assert.IsNull(ContextManager.GetInstance().GetRecognisedNamespace(notRegisteredNamespace));
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void UnregisterNamespaceTest() {
+            String testNamespace = "com.hello.world";
+            ContextManager manager = new ContextManager();
+            NUnit.Framework.Assert.IsNull(manager.GetRecognisedNamespace(testNamespace));
+            manager.RegisterGenericContextForProducts(JavaUtil.ArraysAsList(testNamespace), JavaUtil.ArraysAsList("myProduct"
                 ));
+            NUnit.Framework.Assert.AreEqual(testNamespace, manager.GetRecognisedNamespace(testNamespace + ".MyClass"));
+            manager.UnregisterGenericContextForProducts(JavaUtil.ArraysAsList(testNamespace));
+            NUnit.Framework.Assert.IsNull(manager.GetRecognisedNamespace(testNamespace));
         }
 
         [NUnit.Framework.Test]

itext/itext.commons/itext/commons/actions/contexts/AbstractContextManagerConfigurationEvent.cs

@@ -37,5 +37,9 @@ protected internal virtual void RegisterGenericContext(ICollection<String> names
              products) {
             ContextManager.GetInstance().RegisterGenericContextForProducts(namespaces, products);
         }
+
+        protected internal virtual void UnregisterGenericContext(ICollection<String> namespaces) {
+            ContextManager.GetInstance().UnregisterGenericContextForProducts(namespaces);
+        }
     }
 }

itext/itext.commons/itext/commons/actions/contexts/ContextManager.cs

@@ -144,6 +144,13 @@ internal virtual void RegisterGenericContextForProducts(ICollection<String> name
             RegisterGenericContextForProducts(namespaces, JavaCollectionsUtil.EmptyList<String>(), products);
         }
 
+        // TODO DEVSIX-5311 consider renaming to be in sync with renamed registerGenericContextForProducts
+        internal virtual void UnregisterGenericContextForProducts(ICollection<String> namespaces) {
+            foreach (String @namespace in namespaces) {
+                UnregisterContext(@namespace);
+            }
+        }
+
         private IContext GetNamespaceMapping(String @namespace) {
             if (@namespace != null) {
                 return contextMappings.Get(@namespace);
@@ -171,6 +178,10 @@ private void RegisterContext(String @namespace, IContext context) {
             contextMappings.Put(@namespace, context);
         }
 
+        private void UnregisterContext(String @namespace) {
+            contextMappings.JRemove(@namespace);
+        }
+
         private class LengthComparator : IComparer<String> {
             public virtual int Compare(String o1, String o2) {
                 int lengthComparison = -JavaUtil.IntegerCompare(o1.Length, o2.Length);