This adds an array-argument based version of primitiveToWrapper. Apart from the argument of not having array based versions for every method, I can't see any reason not to add it, so have patched, modified and committing.

The origonal version optimised by returning the passed in array if there were no primitives. This seems a bit magical.

PR: #27640
Submitted by:	Alban Peignier


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137852 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/lang/ClassUtils.java

@@ -32,7 +32,7 @@ import java.util.Map;
  * @author Gary Gregory
  * @author Norm Deane
  * @since 2.0
- * @version $Id: ClassUtils.java,v 1.28 2004/02/24 06:01:28 ggregory Exp $
+ * @version $Id: ClassUtils.java,v 1.29 2004/06/27 04:42:54 bayard Exp $
  */
 public class ClassUtils {
 
@@ -511,6 +511,31 @@ public class ClassUtils {
         }   
         return convertedClass;
     }
+
+    /**
+     * <p>Converts the specified array of primitive Class objects to an array of 
+     * its corresponding wrapper Class objects.</p>
+     *
+     * @param classes  the class array to convert, may be null or empty
+     * @return an array which contains for each given class, the wrapper class or 
+     * the original class if class is not a primitive. <code>null</code> if null input. 
+     * Empty array if an empty array passed in.
+     */
+    public static Class[] primitivesToWrappers(Class[] classes) {
+        if (classes == null) {
+            return null;
+        }
+        
+        if (classes.length == 0) {
+            return ArrayUtils.EMPTY_CLASS_ARRAY;
+        }
+        
+        Class[] convertedClasses = new Class[classes.length];
+        for (int i=0; i < classes.length; i++) {
+            convertedClasses[i] = primitiveToWrapper( classes[i] );
+        }
+        return convertedClasses;
+    }
     
     // Inner class
     // ----------------------------------------------------------------------

src/test/org/apache/commons/lang/ClassUtilsTest.java

@@ -33,7 +33,7 @@ import junit.textui.TestRunner;
  *
  * @author Stephen Colebourne
  * @author Gary D. Gregory
- * @version $Id: ClassUtilsTest.java,v 1.11 2004/02/18 23:22:29 ggregory Exp $
+ * @version $Id: ClassUtilsTest.java,v 1.12 2004/06/27 04:42:54 bayard Exp $
  */
 public class ClassUtilsTest extends TestCase {
 
@@ -375,6 +375,38 @@ public class ClassUtilsTest extends TestCase {
         assertNull("null -> null",
             ClassUtils.primitiveToWrapper(null));
     }
+
+    public void testPrimitivesToWrappers() {
+        // test null
+        assertNull("null -> null",
+            ClassUtils.primitivesToWrappers(null));
+        // test empty array
+        assertEquals("empty -> empty",
+                ArrayUtils.EMPTY_CLASS_ARRAY, ClassUtils.primitivesToWrappers(ArrayUtils.EMPTY_CLASS_ARRAY));
+
+        // test an array of various classes
+        final Class[] primitives = new Class[] {
+                Boolean.TYPE, Byte.TYPE, Character.TYPE, Short.TYPE, 
+                Integer.TYPE, Long.TYPE, Double.TYPE, Float.TYPE,
+                String.class, ClassUtils.class
+        };
+        Class[] wrappers= ClassUtils.primitivesToWrappers(primitives);
+        
+        for (int i=0; i < primitives.length; i++) {
+            // test each returned wrapper
+            Class primitive = primitives[i];
+            Class expectedWrapper = ClassUtils.primitiveToWrapper(primitive);
+            
+            assertEquals(primitive + " -> " + expectedWrapper, expectedWrapper, wrappers[i]);
+        }
+
+        // test an array of no primitive classes
+        final Class[] noPrimitives = new Class[] {
+                String.class, ClassUtils.class
+        };
+        // This used to return the exact same array, but no longer does.
+        assertNotSame("unmodified", noPrimitives, ClassUtils.primitivesToWrappers(noPrimitives));
+    }
     
     public void testClassComparator() {
     	Comparator comparator = ClassUtils.CLASS_NAME_COMPARATOR;