Fix rendering of integers in Wikidata extension. Closes #1775

extensions/wikidata/src/org/openrefine/wikidata/schema/WbStringVariable.java

@@ -58,7 +58,11 @@ public class WbStringVariable extends WbVariableExpr<StringValue> {
     public StringValue fromCell(Cell cell, ExpressionContext ctxt)
             throws SkipSchemaExpressionException {
         if (!cell.value.toString().isEmpty()) {
-            return Datamodel.makeStringValue(cell.value.toString());
+        	String stringValue = cell.value.toString();
+        	if (cell.value instanceof Double && ((Double)cell.value) % 1 == 0) {
+        		stringValue = Integer.toString(((Double)cell.value).intValue());
+        	}
+            return Datamodel.makeStringValue(stringValue);
         }
         throw new SkipSchemaExpressionException();
     }

extensions/wikidata/tests/src/org/openrefine/wikidata/schema/WbStringVariableTest.java

@@ -27,6 +27,8 @@ import org.testng.annotations.Test;
 import org.wikidata.wdtk.datamodel.helpers.Datamodel;
 import org.wikidata.wdtk.datamodel.interfaces.StringValue;
 
+import com.google.refine.model.Cell;
+
 public class WbStringVariableTest extends WbVariableTest<StringValue> {
 
     @Override
@@ -53,6 +55,23 @@ public class WbStringVariableTest extends WbVariableTest<StringValue> {
         evaluatesTo(Datamodel.makeStringValue("dirty \t"), "dirty \t");
     }
     
+    /**
+     * Test that integers are correctly converted to strings
+     */
+    @Test
+    public void testInteger() {
+    	evaluatesTo(Datamodel.makeStringValue("45"), new Cell(45,null));
+    }
+    
+    /**
+     * Test that floating point numbers with no decimal part are also converted
+     */
+    @Test
+    public void testDoubleInteger() {
+    	evaluatesTo(Datamodel.makeStringValue("45"), new Cell(45.0,null));
+    }
+
+
     @Test
     public void testLeadingWhitespace() {
         evaluatesTo(Datamodel.makeStringValue(" dirty"), " dirty");