Changeset 22786 for main/trunk/greenstone3/src/java/org/greenstone/gsdl3/core/TransformingReceptionist.java

Timestamp:

2010-08-25T16:45:27+12:00 (14 years ago)

Author:

sjm84

Message:

Added the ability to get a specified section of a page using the excerptid and excerpttag cgi arguments

File:

• main/trunk/greenstone3/src/java/org/greenstone/gsdl3/core/TransformingReceptionist.java (modified) (2 diffs)

main/trunk/greenstone3/src/java/org/greenstone/gsdl3/core/TransformingReceptionist.java

@@ -159 +159 @@
     // transform the page using xslt
     Node transformed_page = transformPage(page);
-        
-    return transformed_page;
+    
+    // if the user has specified they want only a part of the full page then subdivide it
+    boolean subdivide = false;
+    String excerptID = null;
+    String excerptTag = null;
+    Element request = (Element)GSXML.getChildByTagName(page, GSXML.PAGE_REQUEST_ELEM);
+    Element cgi_param_list = (Element)GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
+    if (cgi_param_list != null) {
+          HashMap params = GSXML.extractParams(cgi_param_list, false);
+          if((excerptID = (String)params.get("excerptid")) != null)
+          {
+            subdivide = true;
+          }
+          if((excerptTag = (String)params.get("excerpttag")) != null)
+          {
+            subdivide = true;
+          }
+    }
+
+    if(subdivide)
+    {
+        Node subdivided_page = subdivide(transformed_page, excerptID, excerptTag);
+        if(subdivided_page != null)
+        {
+            return subdivided_page;
+        }
+    }
+        
+    return transformed_page; 
+  }
+  
+  protected Node subdivide(Node transformed_page, String excerptID, String excerptTag)
+  {
+    if(excerptID != null)
+    {
+        Node selectedElement = getNodeByIdRecursive(transformed_page, excerptID);
+        return selectedElement;
+    }
+    else if(excerptTag != null)
+    {
+        Node selectedElement = getNodeByTagRecursive(transformed_page, excerptTag);
+        return selectedElement;
+    }
+    return transformed_page;
+  }
+  
+  protected Node getNodeByIdRecursive(Node parent, String id)
+  {
+    if(parent.hasAttributes() && ((Element)parent).getAttribute("id").equals(id))
+    {
+        return parent;
+    }
+    
+    NodeList children = parent.getChildNodes();
+    for(int i = 0; i < children.getLength(); i++)
+    {
+        Node result = null;
+        if((result = getNodeByIdRecursive(children.item(i), id)) != null)
+        {
+            return result;
+        }
+    }
+    return null;
+  }
+  
+  protected Node getNodeByTagRecursive(Node parent, String tag)
+  {
+    if(parent.getNodeType() == Node.ELEMENT_NODE && ((Element)parent).getTagName().equals(tag))
+    {
+        return parent;
+    }
+    
+    NodeList children = parent.getChildNodes();
+    for(int i = 0; i < children.getLength(); i++)
+    {
+        Node result = null;
+        if((result = getNodeByTagRecursive(children.item(i), tag)) != null)
+        {
+            return result;
+        }
+    }
+    return null;
   }
     
@@ -171 +251 @@
   protected Node transformPage(Element page) {
 
-    logger.debug("page before transfomring:");
+    logger.debug("page before transforming:");
     logger.debug(this.converter.getPrettyString(page));