Changeset 26508 for main

Timestamp:

2012-11-23T00:40:57+13:00 (11 years ago)

Author:

davidb

Message:

The browse action now support 'descendants' as a CGI-argument, which if set to '1' will produce the whole hierarchy for a given classifier point. Useful in AJAX requests (such as producing a tag-cloud of an entire classifier).

One unknown undesirable side-effect of this at the moment is that once the value has been given, it is then remembered in the users jsession/cookie and consequently causes all subsequent requests to be fully expanded. The tag-cloud example -- as a work around for now -- makes a second call over AJAX with descendants=0 to effectively clear the value.

File:

• main/trunk/greenstone3/src/java/org/greenstone/gsdl3/action/GS2BrowseAction.java (modified) (3 diffs)

main/trunk/greenstone3/src/java/org/greenstone/gsdl3/action/GS2BrowseAction.java

@@ -22 +22 @@
     public static final String CLASSIFIER_ARG = "cl";
 
+    public static final String DESCENDANTS_ARG = "descendants";
+
     static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.GS2BrowseAction.class.getName());
 
@@ -54 +56 @@
             logger.error("classifierBrowse, need to specify a collection!");
             return page_response;
+        }
+
+        boolean get_descendants = false;
+        String descendants_str = (String) params.get(DESCENDANTS_ARG);
+        if (descendants_str != null && descendants_str.equals("1"))
+        {
+            get_descendants = true;
         }
 
@@ -172 +181 @@
         param.setAttribute(GSXML.VALUE_ATT, "children");
 
+        if (get_descendants)
+        {
+            param = this.doc.createElement(GSXML.PARAM_ELEM);
+            param_list.appendChild(param);
+            param.setAttribute(GSXML.NAME_ATT, "structure");
+            param.setAttribute(GSXML.VALUE_ATT, "descendants");
+        }
+
+
         // put the classifier node into a classifier node list
         Element classifier_list = this.doc.createElement(GSXML.CLASS_NODE_ELEM + GSXML.LIST_MODIFIER);