source: trunk/gsdl3/src/java/org/greenstone/gsdl3/action/PageAction.java@ 3467

package org.greenstone.gsdl3.action;

import org.greenstone.gsdl3.core.ModuleInterface;
import org.greenstone.gsdl3.util.*;
// XML classes
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element;

import java.util.HashMap;
import java.io.File;

public class PageAction extends Action {

    public String process (Element message) {
    
    Element request = (Element)message.getElementsByTagName("request").item(0);
    // the page name is the subaction
    String page_name = request.getAttribute("subaction");

    // create the return page tree
    Element page = doc_.createElement("page");
    page.setAttribute("lang", message.getAttribute("lang"));
    // add the lang stuff from xml_in
    page.appendChild(doc_.importNode(GSXML.getChildByTagName(message, "translate"), true));
    // add the system stuff from xml_in
    page.appendChild(doc_.importNode(GSXML.getChildByTagName(message, "config"), true));

    if (page_name.equals("")) {
        // for now send an error. change to always display the home page?
        return GSHTML.errorPage(" page action specified, but no page specified");
    }
    if (page_name.equals("home")) {
        return homePage(page, request);
    } else if (page_name.equals("about")) {
        return aboutPage(page, request);
    } else {
        return GSHTML.errorPage("page: "+page_name+" not yet implemented");
    }
    }


    protected String homePage(Element page, Element orig_message) {
    
    // first, get the list of collections from mr
    
    Element coll_list_message = doc_.createElement("message");
    coll_list_message.setAttribute("lang", page.getAttribute("lang"));
    Element coll_list_request = doc_.createElement("request");
    coll_list_message.appendChild(coll_list_request);
    coll_list_request.setAttribute("type", "describe");
    //coll_list_request.setAttribute("info", "collectionList");
    
    Element coll_list_response = (Element)mr_.process(coll_list_message);
    if (coll_list_response==null) {
        return GSHTML.errorPage("couldn't query the mr about collections");
    }
    
    // second, get the metadata for each collection
    NodeList colls = coll_list_response.getElementsByTagName("collection");
    
    Element metadata_message = doc_.createElement("message");
    metadata_message.setAttribute("lang", page.getAttribute("lang"));
    Element metadata_request = doc_.createElement("request");
    metadata_message.appendChild(metadata_request);
    metadata_request.setAttribute("type", "describe");  
    for (int i=0; i<colls.getLength(); i++) {
        // get the metadata for each one
        Element c = (Element)colls.item(i);
        String name = c.getAttribute("name");
        
        metadata_request.setAttribute("to", name); // overwrites the old value
        Element metadata_response = (Element)mr_.process(metadata_message);
        Element coll = (Element)metadata_response.getElementsByTagName("collection").item(0);
        GSXML.mergeMetadataLists(c, coll); // add the metadata to the original response
    }

    //now the full response is in coll_list_response

    // add it in to the page xml tree
    page.appendChild(doc_.importNode(GSXML.getChildByTagName(coll_list_response, "response"), true));

    String stylesheet = GSFile.stylesheetFile(config_, "home.xsl");
    Document style_doc = converter_.getDOM(new File(stylesheet));
    GSXSLT.absoluteIncludePaths(style_doc, config_);
    //System.out.println("page=");
    //System.out.println(converter_.getString(page));
    return transformer_.transform(style_doc, page);    
    
             
    } // homePage

    protected String aboutPage(Element page, Element request) {

    // get the params out
    HashMap params = GSXML.extractParams((Element)GSXML.getNodeByPath(request, "paramList"));
    String coll_name = (String)params.get("c");
    if (coll_name == null || coll_name.equals("")) {
        coll_name = (String)params.get("sc"); // cluster name
    }
    if (coll_name == null || coll_name.equals("")) {
        return GSHTML.errorPage("about page - need to specify coll name or cluster name");
    }

    Element coll_about_message = doc_.createElement("message");
    coll_about_message.setAttribute("lang", page.getAttribute("lang"));

    Element coll_about_request = doc_.createElement("request");
    coll_about_message.appendChild(coll_about_request);
    coll_about_request.setAttribute("type", "describe");
    coll_about_request.setAttribute("to", coll_name);

    Element coll_about_response = (Element)mr_.process(coll_about_message);

    //  System.out.println("coll response=");
    //System.out.println(converter_.getString(coll_about_response));
    // add the response to the page 
    page.appendChild(doc_.importNode(GSXML.getChildByTagName(coll_about_response, "response"), true));

    // process using the stylesheet
    String stylesheet = GSFile.stylesheetFile(config_, "about.xsl");
    Document style_doc = converter_.getDOM(new File(stylesheet));
    GSXSLT.absoluteIncludePaths(style_doc, config_);
    return transformer_.transform(style_doc, page);    

    
    }
}