source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/action/XMLDocumentAction.java@ 24993

package org.greenstone.gsdl3.action;

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

import java.util.HashMap;
import java.util.HashSet;
import java.util.Vector;
import java.util.Map;
import java.util.Iterator;
import java.io.File;

/** action class for retrieving parts of XML documents */
public class XMLDocumentAction extends Action
{

    /**
     * process - processes a request.
     */
    public Node process(Node message_node)
    {

        Element message = this.converter.nodeToElement(message_node);

        // get the request - assume there is only one
        Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);

        // create the return message
        Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
        Element page_response = this.doc.createElement(GSXML.RESPONSE_ELEM);
        result.appendChild(page_response);

        // extract the params from the cgi-request, and check that we have a coll specified
        Element cgi_param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
        HashMap params = GSXML.extractParams(cgi_param_list, false);

        String collection = (String) params.get(GSParams.COLLECTION);
        if (collection == null || collection.equals(""))
        {
            return result;
        }
        String doc_name = (String) params.get(GSParams.DOCUMENT);
        if (doc_name == null || doc_name.equals(""))
        {
            return result;
        }
        UserContext userContext = new UserContext(request);

        // subaction used to decide if we are returning content or structure
        String document_mode = request.getAttribute(GSXML.SUBACTION_ATT);
        String to = null;
        if (document_mode.equals("text"))
        {
            to = GSPath.appendLink(collection, "DocumentContentRetrieve");
        }
        else if (document_mode.equals("toc"))
        {
            to = GSPath.appendLink(collection, "DocumentStructureRetrieve");
        }
        else
        { // the default is text
            to = GSPath.appendLink(collection, "DocumentContentRetrieve");
        }

        // make the request to the collection
        Element mr_message = this.doc.createElement(GSXML.MESSAGE_ELEM);

        Element ret_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, userContext);
        mr_message.appendChild(ret_request);

        Element doc_list = this.doc.createElement(GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER);
        ret_request.appendChild(doc_list);
        Element doc = this.doc.createElement(GSXML.DOC_NODE_ELEM);
        doc.setAttribute(GSXML.NODE_ID_ATT, doc_name);
        doc_list.appendChild(doc);

        // also add in a request for the Title metadata
        to = GSPath.appendLink(collection, "DocumentMetadataRetrieve");
        Element meta_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, userContext);
        // copy the doc list
        meta_request.appendChild(doc_list.cloneNode(true));
        // add in a metadata param
        Element param_list = this.doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
        meta_request.appendChild(param_list);
        Element param = GSXML.createParameter(this.doc, "metadata", "root_Title");
        param_list.appendChild(param);

        // add the request to the message
        mr_message.appendChild(meta_request);

        Element ret_response = (Element) this.mr.process(mr_message);
        String[] links = { GSXML.RESPONSE_ELEM, GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER, GSXML.DOC_NODE_ELEM };
        String path = GSPath.createPath(links);
        Element doc_node = (Element) this.doc.importNode(GSXML.getNodeByPath(ret_response, path), true);
        page_response.appendChild(doc_node);

        // get the metadata list
        Element meta_response = (Element) ret_response.getElementsByTagName(GSXML.RESPONSE_ELEM).item(1);
        String[] mlinks = { GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER, GSXML.DOC_NODE_ELEM, GSXML.METADATA_ELEM + GSXML.LIST_MODIFIER };
        path = GSPath.createPath(mlinks);

        Element meta_list = (Element) GSXML.getNodeByPath(meta_response, path);
        if (meta_list != null)
        {
            doc_node.appendChild(this.doc.importNode(meta_list, true));
        }
        return result;
    }

}