NIHVIVO-1194 stripping characters invalid in XML from user input

webapp/test/edu/cornell/mannlib/vitro/webapp/edit/n3editing/EditN3UtilsTest.java

@@ -0,0 +1,50 @@
+/* $This file is distributed under the terms of the license in /doc/license.txt$ */
+
+package edu.cornell.mannlib.vitro.webapp.edit.n3editing;
+
+import junit.framework.Assert;
+
+import org.apache.commons.io.output.NullOutputStream;
+import org.junit.Test;
+
+import com.hp.hpl.jena.rdf.model.Model;
+import com.hp.hpl.jena.rdf.model.ModelFactory;
+import com.hp.hpl.jena.vocabulary.RDFS;
+
+
+public class EditN3UtilsTest {
+
+    @Test
+    public void testStripInvalidXMLChars() {
+        Model m = ModelFactory.createDefaultModel();
+        String containsInvalidXMLChars = "Blah \u0001blah \u0002blah\uDDDD";
+        String clean = "Blah blah blah"; 
+        
+        // add a statement with the literal incompatible with XML to model m
+        m.add(m.createResource(), RDFS.label, containsInvalidXMLChars);
+        
+        Assert.assertFalse(isSerializableAsXML(m));
+        
+        String stripped = EditN3Utils.stripInvalidXMLChars(
+                                containsInvalidXMLChars);
+        Assert.assertEquals(clean, stripped);
+        
+        // clear the model of any statements
+        m.removeAll();
+        // add a statement with a literal that has been stripped of bad chars
+        m.add(m.createResource(), RDFS.label, stripped);
+        
+        Assert.assertTrue(isSerializableAsXML(m));      
+    }
+    
+    private boolean isSerializableAsXML(Model m) {
+        try {
+            NullOutputStream nullStream = new NullOutputStream();
+            m.write(nullStream, "RDF/XML");
+            return true;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+    
+}