--- a/src/main/java/de/mpiwg/itgroup/annotations/Actor.java	Fri Jul 13 17:22:05 2012 +0200
+++ b/src/main/java/de/mpiwg/itgroup/annotations/Actor.java	Fri Jul 13 20:41:02 2012 +0200
@@ -7,19 +7,37 @@
 
 /**
  * @author casties
- *
+ * 
  */
 public abstract class Actor {
 
     public String uri;
     public String name;
     public String id;
-    
+
     /**
      * @return if this Actor is a Group
      */
     public abstract boolean isGroup();
-    
+
+    /**
+     * Returns if this Actor is equivalent to an Actor with this id. If this is
+     * a Group returns true when the Person is in the Group.
+     * 
+     * @param userId
+     * @return
+     */
+    public boolean isEquivalentWith(String userId) {
+        if (userId == null) return false;
+        if (userId.equals(getIdString())) {
+            return true;
+        }
+        if (isGroup()) {
+            // TODO: check if person in group
+        }
+        return false;
+    }
+
     /**
      * @return the uri
      */
@@ -33,26 +51,30 @@
      * @return the uri
      */
     public String getUriString() {
-    	if (uri == null) {
-    		return getUriFromId(id, isGroup());
-    	}
+        if (uri == null) {
+            return getUriFromId(id, isGroup());
+        }
         return uri;
     }
 
     /**
-     * @param uri the uri to set
+     * @param uri
+     *            the uri to set
      */
     public void setUri(String uri) {
         this.uri = uri;
     }
+
     /**
      * @return the name
      */
     public String getName() {
         return name;
     }
+
     /**
-     * @param name the name to set
+     * @param name
+     *            the name to set
      */
     public void setName(String name) {
         this.name = name;
@@ -64,21 +86,22 @@
     public String getId() {
         return id;
     }
-    
+
     /**
      * Returns id as a String starting with "group:" for groups.
      * 
      * @return
      */
     public abstract String getIdString();
-    
+
     /**
-     * @param id the id to set
+     * @param id
+     *            the id to set
      */
     public void setId(String id) {
         this.id = id;
     }
-    
+
     /**
      * Returns a short id from an uri.
      * 
@@ -109,8 +132,8 @@
         if (isGroup) {
             prefix = NS.MPIWG_GROUPS_URL;
         }
-        if (id != null && ! id.startsWith("http://")) {
-            uri = prefix + id; 
+        if (id != null && !id.startsWith("http://")) {
+            uri = prefix + id;
         }
         return uri;
     }