revert r23341 as it was already fixed in hudson.util.XStream2 in r23339

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@23395 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/BuildAuthorizationToken.java

@@ -23,11 +23,7 @@
  */
 package hudson.model;
 
-import com.thoughtworks.xstream.converters.Converter;
-import com.thoughtworks.xstream.converters.MarshallingContext;
-import com.thoughtworks.xstream.converters.UnmarshallingContext;
-import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
-import com.thoughtworks.xstream.io.HierarchicalStreamReader;
+import com.thoughtworks.xstream.converters.basic.AbstractSingleValueConverter;
 import hudson.Util;
 import hudson.security.ACL;
 import org.kohsuke.stapler.StaplerRequest;
@@ -79,17 +75,18 @@ public final class BuildAuthorizationToken {
         return token;
     }
 
-    public static final class ConverterImpl implements Converter {
+    public static final class ConverterImpl extends AbstractSingleValueConverter {
         public boolean canConvert(Class type) {
             return type== BuildAuthorizationToken.class;
         }
 
-        public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) {
-            writer.setValue(((BuildAuthorizationToken) source).token);
+        public Object fromString(String str) {
+            return new BuildAuthorizationToken(str);
         }
 
-        public Object unmarshal(HierarchicalStreamReader reader, final UnmarshallingContext context) {
-            return new BuildAuthorizationToken(reader.getValue());
+        @Override
+        public String toString(Object obj) {
+            return ((BuildAuthorizationToken)obj).token;
         }
     }
 }