fixed a compilation problem. I think this reads better than a two-arg "isNewerThan"

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@24466 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/PluginWrapper.java

@@ -26,6 +26,7 @@ package hudson;
 import hudson.model.Hudson;
 import hudson.model.UpdateCenter;
 import hudson.model.UpdateSite;
+import hudson.util.VersionNumber;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -287,6 +288,26 @@ public final class PluginWrapper {
         return "???";
     }
 
+    /**
+     * Returns the version number of this plugin
+     */
+    public VersionNumber getVersionNumber() {
+        return new VersionNumber(getVersion());
+    }
+
+    /**
+     * Returns true if the version of this plugin is older than the given version.
+     */
+    public boolean isOlderThan(VersionNumber v) {
+        try {
+            return getVersionNumber().compareTo(v) < 0;
+        } catch (IllegalArgumentException e) {
+            // if we can't figure out our current version, it probably means it's very old,
+            // since the version information is missing only from the very old plugins 
+            return true;
+        }
+    }
+
     /**
      * Terminates the plugin.
      */