[jboss-svn-commits] JBoss Common SVN: r2655 - common-core/branches/2_0/src/main/java/org/jboss/util.

[jboss-svn-commits at lists.jboss.org]

Author: dimitris at jboss.org
Date: 2007-10-25 17:07:34 -0400 (Thu, 25 Oct 2007)
New Revision: 2655

Modified:
   common-core/branches/2_0/src/main/java/org/jboss/util/Classes.java
Log:
JBCOMMON-36, add a Classes.getAllUniqueInterfaces utility method.

Modified: common-core/branches/2_0/src/main/java/org/jboss/util/Classes.java
===================================================================
--- common-core/branches/2_0/src/main/java/org/jboss/util/Classes.java	2007-10-25 21:00:45 UTC (rev 2654)
+++ common-core/branches/2_0/src/main/java/org/jboss/util/Classes.java	2007-10-25 21:07:34 UTC (rev 2655)
@@ -38,7 +38,8 @@
  *
  * @version <tt>$Revision$</tt>
  * @author  <a href="mailto:jason at planet57.com">Jason Dillon</a>
- * @author Scott.Stark at jboss.org
+ * @author  <a href="mailto:scott.stark at jboss.org">Scott Stark</a>
+ * @author  <a href="mailto:dimitris at jboss.org">Dimitris Andreadis<a/>
  */
 public final class Classes
 {
@@ -401,18 +402,18 @@
    }
 
    /**
-    * Object a list of all interfaces starting with the argument class c through
-    * all superclasses
+    * Populates a list with all the interfaces implemented by the argument
+    * class c and all its superclasses.
     * 
-    * @param allIfaces - the list to populate for 
+    * @param allIfaces - the list to populate with the interfaces 
     * @param c - the class to start scanning for interfaces
     */
    public static void getAllInterfaces(List allIfaces, Class c)
    {
-      while( c != null )
+      while (c != null)
       {
          Class[] ifaces = c.getInterfaces();
-         for(int n = 0; n < ifaces.length; n ++)
+         for (int n = 0; n < ifaces.length; n ++)
          {
             allIfaces.add(ifaces[n]);
          }
@@ -421,6 +422,28 @@
    }
 
    /**
+    * Returns an array containing all the unique interfaces implemented
+    * by the argument class c and all its superclasses. Interfaces that
+    * appear multiple times through inheritence are only accounted for once.
+    * 
+    * @param c - the class to start scanning for interfaces
+    */   
+   public static Class[] getAllUniqueInterfaces(Class c)
+   {
+      Set uniqueIfaces = new HashSet();
+      while (c != null )
+      {
+         Class[] ifaces = c.getInterfaces();
+         for (int n = 0; n < ifaces.length; n ++)
+         {
+            uniqueIfaces.add(ifaces[n]);
+         }
+         c = c.getSuperclass();
+      }
+      return (Class[])uniqueIfaces.toArray(new Class[uniqueIfaces.size()]);
+   }
+
+   /**
     * Check if the given class is a primitive wrapper class.
     *
     * @param type    Class to check.