added a mechanism to customize the conversion process.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@3042 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/api/CustomExposureBean.java

+package hudson.api;
+
+/**
+ * Interface that an exposed bean can implement, to do the equivalent
+ * of <tt>writeReplace</tt> in Java serialization.
+ * @author Kohsuke Kawaguchi
+ */
+public interface CustomExposureBean {
+    /**
+     * The returned object will be introspected and written as JSON/XML.
+     */
+    Object toExposedObject();
+}

core/src/main/java/hudson/api/Property.java

@@ -58,6 +58,11 @@ abstract class Property implements Comparable<Property> {
             return;
         }
 
+        if(value instanceof CustomExposureBean) {
+            writeValue(((CustomExposureBean)value).toExposedObject(),depth,writer);
+            return;
+        }
+
         Class c = value.getClass();
 
         if(STRING_TYPES.contains(c)) {

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

@@ -5,12 +5,14 @@ import com.thoughtworks.xstream.converters.basic.AbstractBasicConverter;
 
 import java.io.Serializable;
 
+import hudson.api.CustomExposureBean;
+
 /**
  * The build outcome.
  *
  * @author Kohsuke Kawaguchi
  */
-public final class Result implements Serializable {
+public final class Result implements Serializable, CustomExposureBean {
     /**
      * The build didn't have any fatal errors not errors.
      */
@@ -75,6 +77,10 @@ public final class Result implements Serializable {
         return FAILURE;
     }
 
+    public Object toExposedObject() {
+        return name;
+    }
+
     private static final long serialVersionUID = 1L;
 
     private static final Result[] all = new Result[] {SUCCESS,UNSTABLE,FAILURE,ABORTED};