# HG changeset patch
# User casties
# Date 1483990735 -3600
# Node ID 9d342e713c2f38a32e31d3477a9baf1d5e1a6b86
# Parent  58659e8652792bac4ae79fddbe6244c2f00b2233
make RelationSortByTargetOW work with empty own-values. nicer comments.

diff -r 58659e865279 -r 9d342e713c2f src/main/java/org/mpi/openmind/repository/bo/Attribute.java
--- a/src/main/java/org/mpi/openmind/repository/bo/Attribute.java	Fri Jan 06 16:57:01 2017 +0100
+++ b/src/main/java/org/mpi/openmind/repository/bo/Attribute.java	Mon Jan 09 20:38:55 2017 +0100
@@ -110,8 +110,15 @@
         setOwnValue(value);
     }
 
-    public Attribute(String label, String contentType, String value) {
-        this.setObjectClass(label);
+    /**
+     * Create an Attribute with the given object_class, content_type and own_value.
+     * 
+     * @param oc
+     * @param contentType
+     * @param value
+     */
+    public Attribute(String oc, String contentType, String value) {
+        this.setObjectClass(oc);
         this.setContentType(contentType);
         this.setOwnValue(value);
     }
diff -r 58659e865279 -r 9d342e713c2f src/main/java/org/mpi/openmind/repository/bo/utils/RelationSortByTargetOW.java
--- a/src/main/java/org/mpi/openmind/repository/bo/utils/RelationSortByTargetOW.java	Fri Jan 06 16:57:01 2017 +0100
+++ b/src/main/java/org/mpi/openmind/repository/bo/utils/RelationSortByTargetOW.java	Mon Jan 09 20:38:55 2017 +0100
@@ -10,7 +10,15 @@
 		if(r1.getTarget() != null && r2.getTarget() != null){
 			String r1OW = r1.getTarget().getOwnValue();
 			String r2OW = r2.getTarget().getOwnValue();
-			return r1OW.compareTo(r2OW);
+			if (r1OW == null) {
+				if (r2OW == null) {
+					return 0;
+				} else {
+					return -1;
+				}
+			} else {
+				return r1OW.compareTo(r2OW);
+			}
 		}else if(r1.getTarget() == null){
 			return -1;
 		}else if(r2.getTarget() == null){