source: trunk/gsdl3/src/java/org/greenstone/gsdl3/action/XMLDocumentAction.java@ 6300

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 Element process (Element message) {
    
    // 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;
    }
    String lang = request.getAttribute(GSXML.LANG_ATT);
    String uid = request.getAttribute(GSXML.USER_ID_ATT);
    
    // 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, lang, uid);
    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, lang, uid);
    // 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 = 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;
    }

}