Fix for links management.

[Honoré David <dh...@oma.be>]

There is a patch for org.apache.slide.structure.ObjectNode .Without it, 
links are lost when cloning an object, and when deleting an object which 
has more than one link only one link/2 is deleted and then 
ServiceException occur because Integrity of database is not good.

by the way the cache management is wrong. the object in global cache are 
modified while in a transaction. ... then if transaction is rolled back, 
Object in cache are invalid and does not match database anymore, but are 
always used. (patch for those bugs are comming)



Index: src/share/org/apache/slide/structure/ObjectNode.java
===================================================================
--- src/share/org/apache/slide/structure/ObjectNode.java    (revision 
382350)
+++ src/share/org/apache/slide/structure/ObjectNode.java    (working copy)
@@ -71,13 +71,12 @@
      */
     private Vector links = null;
    
-    /*
+    /**
      * If true then the {@link #links} vector is shared between multiple
      * ObjectNode-instances and thus must not be modified.
      *
-     *FIXME Never read! Do we need to implement linkSharing
      */
-    //private boolean linksShared;
+    private boolean linksShared;
    
     /**
      * Vector of bindings. Before modifying this vector you must check
@@ -369,7 +368,7 @@
         if (this.links == null) {
             return EmptyEnumeration.INSTANCE;
         } else {
-            return links.elements();
+            return ((Vector)links.clone()).elements();
         }
     }
    
@@ -409,7 +408,7 @@
        
         try {
             // init the shared fields to let clone() copy them
-            //this.linksShared=true;
+            this.linksShared=true;
             this.bindingsShared=true;
             result = (ObjectNode) super.clone();
         } catch(CloneNotSupportedException e) {
@@ -481,6 +480,10 @@
      */
     public void addLink( LinkNode link ) {
         if (this.links == null) this.links = new Vector();
+        if (linksShared) {
+            links = (Vector) links.clone();
+            linksShared = false;
+        }
         links.add(link.getUri());
     }
    
@@ -540,6 +543,10 @@
      * @param link
      */
     public void removeLink(LinkNode link) {
+        if (linksShared) {
+            links = (Vector) links.clone();
+            linksShared = false;
+        }
         if (this.links != null) {
             links.remove(link.getUri());
         }

Note, I do not post the patch in bugzilla because there is no more 
commiter working on slide. Warning of compilation error, spam on mailing 
list ... etc ... I think Slide was a good project, but is dead. If I am 
wrong tell me.

Have a nice day everybody.