Add possibility to unregister namespaces from ContextManager

DEVSIX-5795

Author: Snipx

commons/src/main/java/com/itextpdf/commons/actions/contexts/AbstractContextManagerConfigurationEvent.java

@@ -40,4 +40,8 @@ public AbstractContextManagerConfigurationEvent() {
     protected void registerGenericContext(Collection<String> namespaces, Collection<String> products) {
         ContextManager.getInstance().registerGenericContextForProducts(namespaces, products);
     }
+
+    protected void unregisterGenericContext(Collection<String> namespaces) {
+        ContextManager.getInstance().unregisterGenericContextForProducts(namespaces);
+    }
 }

commons/src/main/java/com/itextpdf/commons/actions/contexts/ContextManager.java

@@ -145,6 +145,13 @@ void registerGenericContextForProducts(Collection<String> namespaces, Collection
         registerGenericContextForProducts(namespaces, Collections.<String>emptyList(), products);
     }
 
+    // TODO DEVSIX-5311 consider renaming to be in sync with renamed registerGenericContextForProducts
+    void unregisterGenericContextForProducts(Collection<String> namespaces) {
+        for (String namespace : namespaces) {
+            unregisterContext(namespace);
+        }
+    }
+
     private IContext getNamespaceMapping(String namespace) {
         if (namespace != null) {
             return contextMappings.get(namespace);
@@ -172,6 +179,10 @@ private void registerContext(String namespace, IContext context) {
         contextMappings.put(namespace, context);
     }
 
+    private void unregisterContext(String namespace) {
+        contextMappings.remove(namespace);
+    }
+
     private static class LengthComparator implements Comparator<String> {
         @Override
         public int compare(String o1, String o2) {

commons/src/test/java/com/itextpdf/commons/actions/contexts/ContextManagerTest.java

@@ -46,6 +46,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.type.UnitTest;
 
+import java.util.Arrays;
 import java.util.Collections;
 import org.junit.Assert;
 import org.junit.Test;
@@ -88,8 +89,20 @@ public void getRecognisedNamespaceForSpecificNamespaceTest() {
     public void notRegisteredNamespaceTest() {
         String notRegisteredNamespace = "com.hello.world";
 
-        Assert.assertEquals(null,
-                ContextManager.getInstance().getRecognisedNamespace(notRegisteredNamespace));
+        Assert.assertNull(ContextManager.getInstance().getRecognisedNamespace(notRegisteredNamespace));
+    }
+
+    @Test
+    public void unregisterNamespaceTest() {
+        String testNamespace = "com.hello.world";
+        ContextManager manager = new ContextManager();
+        Assert.assertNull(manager.getRecognisedNamespace(testNamespace));
+        manager.registerGenericContextForProducts(Arrays.asList(testNamespace),
+                Arrays.asList("myProduct"));
+        Assert.assertEquals(testNamespace,
+                manager.getRecognisedNamespace(testNamespace + ".MyClass"));
+        manager.unregisterGenericContextForProducts(Arrays.asList(testNamespace));
+        Assert.assertNull(manager.getRecognisedNamespace(testNamespace));
     }
 
     @Test