Ignore:
Timestamp:
2012-01-26T11:37:58+13:00 (12 years ago)
Author:
sjm84
Message:

Reformatting this file ahead of some changes

File:
1 edited

Legend:

Unmodified
Added
Removed

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

    r24889 r24990  
    44import org.greenstone.gsdl3.util.*;
    55// XML classes
    6 import org.w3c.dom.Node; 
    7 import org.w3c.dom.NodeList; 
    8 import org.w3c.dom.Document; 
    9 import org.w3c.dom.Element; 
     6import org.w3c.dom.Node;
     7import org.w3c.dom.NodeList;
     8import org.w3c.dom.Document;
     9import org.w3c.dom.Element;
    1010
    1111import java.util.HashMap;
    … …  
    1717
    1818/** action for GS2 style classifier browsing */
    19 public class GS2BrowseAction extends Action {
    20    
    21     public static final String CLASSIFIER_ARG = "cl";
    22 
    23     static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.GS2BrowseAction.class.getName());   
    24 
    25     /** process the request */
    26     public Node process (Node message_node) {
    27 
    28     Element message = this.converter.nodeToElement(message_node);
    29 
    30     // get the request - assume only one
    31     Element request = (Element)GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
    32 
    33     // the result
    34     Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
    35     Element response = classifierBrowse(request);
    36     result.appendChild(response);
    37     return result;
    38     }
    39    
    40 
    41     protected Element classifierBrowse(Element request) {
    42 
    43     Element page_response = this.doc.createElement(GSXML.RESPONSE_ELEM);
    44 
    45     // extract the params from the cgi-request, and check that we have a coll specified
    46     Element cgi_paramList = (Element)GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
    47     HashMap params = GSXML.extractParams(cgi_paramList, false);
    48    
    49     String service_name = (String)params.get(GSParams.SERVICE);
    50     String collection = (String)params.get(GSParams.COLLECTION);
    51     if (collection == null || collection.equals("")) {
    52         logger.error("classifierBrowse, need to specify a collection!");
    53         return page_response;
    54        
     19public class GS2BrowseAction extends Action
     20{
     21
     22    public static final String CLASSIFIER_ARG = "cl";
     23
     24    static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.GS2BrowseAction.class.getName());
     25
     26    /** process the request */
     27    public Node process(Node message_node)
     28    {
     29
     30        Element message = this.converter.nodeToElement(message_node);
     31
     32        // get the request - assume only one
     33        Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
     34
     35        // the result
     36        Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
     37        Element response = classifierBrowse(request);
     38        result.appendChild(response);
     39        return result;
    5540    }
    56    
    57     String lang = request.getAttribute(GSXML.LANG_ATT);
    58     String uid = request.getAttribute(GSXML.USER_ID_ATT);
    59     String to = GSPath.appendLink(collection, service_name);
    60    
    61     // the first part of the response is the service description
    62     // for now get this again from the service.
    63     // this should be cached somehow later on.
    64    
    65     Element info_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
    66     Element info_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, lang, uid);
    67     info_message.appendChild(info_request);
    68    
    69     // also get the format stuff now if there is some
    70     Element format_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_FORMAT, to, lang, uid);
    71     info_message.appendChild(format_request);
    72     // process the requests
    73 
    74     Element info_response = (Element) this.mr.process(info_message);
    75 
    76     // the two responses
    77     NodeList responses = info_response.getElementsByTagName(GSXML.RESPONSE_ELEM);
    78     Element service_response = (Element)responses.item(0);
    79     Element format_response = (Element)responses.item(1);
    80 
    81     Element service_description = (Element)GSXML.getChildByTagName(service_response, GSXML.SERVICE_ELEM);
    82     page_response.appendChild(this.doc.importNode(service_description, true));
    83    
    84     //append site metadata
    85     addSiteMetadata( page_response, lang, uid);
    86 
    87     // if rt=d, then we are just displaying the service
    88     String request_type = (String)params.get(GSParams.REQUEST_TYPE);
    89     if (request_type.equals("d")) {
    90         //return the page that we have so far
    91         return page_response;
     41
     42    protected Element classifierBrowse(Element request)
     43    {
     44
     45        Element page_response = this.doc.createElement(GSXML.RESPONSE_ELEM);
     46
     47        // extract the params from the cgi-request, and check that we have a coll specified
     48        Element cgi_paramList = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
     49        HashMap params = GSXML.extractParams(cgi_paramList, false);
     50
     51        String service_name = (String) params.get(GSParams.SERVICE);
     52        String collection = (String) params.get(GSParams.COLLECTION);
     53        if (collection == null || collection.equals(""))
     54        {
     55            logger.error("classifierBrowse, need to specify a collection!");
     56            return page_response;
     57
     58        }
     59
     60        String lang = request.getAttribute(GSXML.LANG_ATT);
     61        String uid = request.getAttribute(GSXML.USER_ID_ATT);
     62        String to = GSPath.appendLink(collection, service_name);
     63
     64        // the first part of the response is the service description
     65        // for now get this again from the service.
     66        // this should be cached somehow later on.
     67
     68        Element info_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
     69        Element info_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, lang, uid);
     70        info_message.appendChild(info_request);
     71
     72        // also get the format stuff now if there is some
     73        Element format_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_FORMAT, to, lang, uid);
     74        info_message.appendChild(format_request);
     75        // process the requests
     76
     77        Element info_response = (Element) this.mr.process(info_message);
     78
     79        // the two responses
     80        NodeList responses = info_response.getElementsByTagName(GSXML.RESPONSE_ELEM);
     81        Element service_response = (Element) responses.item(0);
     82        Element format_response = (Element) responses.item(1);
     83
     84        Element service_description = (Element) GSXML.getChildByTagName(service_response, GSXML.SERVICE_ELEM);
     85        page_response.appendChild(this.doc.importNode(service_description, true));
     86
     87        //append site metadata
     88        addSiteMetadata(page_response, lang, uid);
     89
     90        // if rt=d, then we are just displaying the service
     91        String request_type = (String) params.get(GSParams.REQUEST_TYPE);
     92        if (request_type.equals("d"))
     93        {
     94            //return the page that we have so far
     95            return page_response;
     96        }
     97
     98        // get the node that the user has clicked on
     99        String classifier_node = (String) params.get(CLASSIFIER_ARG);
     100
     101        // if the node is not defined, return the page that we have so far
     102        if (classifier_node == null || classifier_node.equals(""))
     103        {
     104            return page_response;
     105        }
     106
     107        // the id of the classifier is the top id of the selected node
     108        String top_id = OID.getTop(classifier_node);
     109        HashSet doc_meta_names = new HashSet();
     110        HashSet class_meta_names = new HashSet();
     111        // add in the defaults
     112        doc_meta_names.add("Title");
     113        class_meta_names.add("Title");
     114
     115        // add the format info into the response
     116        Element format_elem = (Element) GSXML.getChildByTagName(format_response, GSXML.FORMAT_ELEM);
     117        if (format_elem != null)
     118        {
     119
     120            // find the one for the classifier we are in
     121            Element this_format = GSXML.getNamedElement(format_elem, GSXML.CLASSIFIER_ELEM, GSXML.NAME_ATT, top_id);
     122            if (this_format == null)
     123            {
     124                this_format = (Element) GSXML.getChildByTagName(format_elem, GSXML.DEFAULT_ELEM);
     125            }
     126
     127            if (this_format != null)
     128            {
     129                Element new_format = GSXML.duplicateWithNewName(this.doc, this_format, GSXML.FORMAT_ELEM, false);
     130                extractMetadataNames(new_format, doc_meta_names, class_meta_names);
     131                // set the format type
     132                new_format.setAttribute(GSXML.TYPE_ATT, "browse");
     133
     134                page_response.appendChild(new_format);
     135            }
     136        }
     137
     138        // find out if this classifier is horizontal at top
     139        Element class_list = (Element) GSXML.getChildByTagName(service_description, GSXML.CLASSIFIER_ELEM + GSXML.LIST_MODIFIER);
     140        Element this_classifier = GSXML.getNamedElement(class_list, GSXML.CLASSIFIER_ELEM, GSXML.NAME_ATT, top_id);
     141        boolean horizontal_at_top = false;
     142        if (!this_classifier.getAttribute("horizontalAtTop").equals(""))
     143        {
     144            horizontal_at_top = true;
     145        }
     146        if (top_id.equals(classifier_node) && horizontal_at_top)
     147        {
     148            // we have asked for a top node - if the first list is horizontal, we will select the first element of that list
     149            // this is a hack. also it craps out if the classifier really isn't horizontalAtTop. -
     150            classifier_node = classifier_node + ".1";
     151
     152        }
     153
     154        // get the browse structure for the selected node
     155        Element classify_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
     156        Element classify_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, lang, uid);
     157        classify_message.appendChild(classify_request);
     158
     159        //Create a parameter list to specify the required structure information
     160        // for now, always get ancestors and children
     161        Element param_list = this.doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
     162        classify_request.appendChild(param_list);
     163        Element param = this.doc.createElement(GSXML.PARAM_ELEM);
     164        param_list.appendChild(param);
     165        param.setAttribute(GSXML.NAME_ATT, "structure");
     166        param.setAttribute(GSXML.VALUE_ATT, "ancestors");
     167        param = this.doc.createElement(GSXML.PARAM_ELEM);
     168        param_list.appendChild(param);
     169        param.setAttribute(GSXML.NAME_ATT, "structure");
     170        param.setAttribute(GSXML.VALUE_ATT, "children");
     171
     172        // put the classifier node into a classifier node list
     173        Element classifier_list = this.doc.createElement(GSXML.CLASS_NODE_ELEM + GSXML.LIST_MODIFIER);
     174        Element classifier = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
     175        classifier.setAttribute(GSXML.NODE_ID_ATT, classifier_node);
     176        classifier_list.appendChild(classifier);
     177        classify_request.appendChild(classifier_list);
     178
     179        if (horizontal_at_top && !classifier_node.equals(top_id))
     180        {
     181            // also put the top id in, to get the persistant horizontal info
     182            classifier = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
     183            classifier.setAttribute(GSXML.NODE_ID_ATT, top_id);
     184            classifier_list.appendChild(classifier);
     185        }
     186        // process the request
     187        Element classify_response = (Element) this.mr.process(classify_message);
     188        String path = GSPath.appendLink(GSXML.RESPONSE_ELEM, GSXML.CLASS_NODE_ELEM + GSXML.LIST_MODIFIER);
     189        Element class_node_list = (Element) GSXML.getNodeByPath(classify_response, path);
     190
     191        path = GSPath.appendLink(GSXML.CLASS_NODE_ELEM, GSXML.NODE_STRUCTURE_ELEM);
     192        // assume that we always get back the top level CL1 node - this becomes the page_classifier node
     193        path = GSPath.appendLink(path, GSXML.CLASS_NODE_ELEM);
     194        Element cl_structure = (Element) GSXML.getNodeByPath(class_node_list, path);
     195        if (cl_structure == null)
     196        {
     197            logger.error("classifier structure request returned no structure");
     198            return page_response;
     199        }
     200
     201        Element page_classifier = null;
     202        if (horizontal_at_top && !classifier_node.equals(top_id))
     203        {
     204            // get the info for the top node
     205            Element top_node = GSXML.getNamedElement(class_node_list, GSXML.CLASS_NODE_ELEM, GSXML.NODE_ID_ATT, top_id);
     206            if (top_node != null)
     207            {
     208                path = GSPath.appendLink(GSXML.NODE_STRUCTURE_ELEM, GSXML.CLASS_NODE_ELEM);
     209                Element top_structure = (Element) GSXML.getNodeByPath(top_node, path);
     210                // add this as the classifier elem
     211                page_classifier = GSXML.duplicateWithNewName(this.doc, top_structure, GSXML.CLASSIFIER_ELEM, true);
     212                page_response.appendChild(page_classifier);
     213                // now replace the child with the structure from the other request
     214                Element new_classifier = (Element) GSXML.getChildByTagName(cl_structure, GSXML.CLASS_NODE_ELEM);
     215                String replace_name = new_classifier.getAttribute(GSXML.NODE_ID_ATT);
     216
     217                // find the appropriate child
     218                Element old_classifier = GSXML.getNamedElement(page_classifier, GSXML.CLASS_NODE_ELEM, GSXML.NODE_ID_ATT, replace_name);
     219                page_classifier.replaceChild(this.doc.importNode(new_classifier, true), old_classifier);
     220                page_classifier.setAttribute(GSXML.NAME_ATT, top_id);
     221            }
     222            else
     223            {
     224                // add the single classifier node as the page classifier
     225                page_classifier = GSXML.duplicateWithNewName(this.doc, cl_structure, GSXML.CLASSIFIER_ELEM, true);
     226                page_response.appendChild(page_classifier);
     227                page_classifier.setAttribute(GSXML.NAME_ATT, top_id);
     228            }
     229
     230        }
     231        else
     232        {
     233            // add the single classifier node as the page classifier
     234            page_classifier = GSXML.duplicateWithNewName(this.doc, cl_structure, GSXML.CLASSIFIER_ELEM, true);
     235            page_response.appendChild(page_classifier);
     236            page_classifier.setAttribute(GSXML.NAME_ATT, top_id);
     237        }
     238        // get the metadata for each classifier node,
     239        // then for each document node
     240
     241        Element metadata_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
     242
     243        boolean did_classifier = false;
     244        boolean did_documents = false;
     245
     246        // if there are classifier nodes
     247        // create a metadata request for the classifier, and add it to
     248        // the the message
     249        NodeList cl_nodes = page_classifier.getElementsByTagName(GSXML.CLASS_NODE_ELEM);
     250
     251        if (cl_nodes.getLength() > 0)
     252        {
     253            did_classifier = true;
     254            Element cl_meta_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to + "MetadataRetrieve", lang, uid);
     255            metadata_message.appendChild(cl_meta_request);
     256
     257            Element new_cl_nodes_list = this.doc.createElement(GSXML.CLASS_NODE_ELEM + GSXML.LIST_MODIFIER);
     258            cl_meta_request.appendChild(new_cl_nodes_list);
     259
     260            for (int c = 0; c < cl_nodes.getLength(); c++)
     261            {
     262
     263                Element cl = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
     264                cl.setAttribute(GSXML.NODE_ID_ATT, ((Element) cl_nodes.item(c)).getAttribute(GSXML.NODE_ID_ATT));
     265                new_cl_nodes_list.appendChild(cl);
     266            }
     267
     268            // create and add in the param list - for now get all the metadata
     269            // should be based on info sent in from the recept, and the
     270            // format stuff
     271            Element cl_param_list = createMetadataParamList(class_meta_names);
     272            cl_meta_request.appendChild(cl_param_list);
     273
     274        }
     275
     276        // if there are document nodes in the classification (happens
     277        // sometimes), create a second request for document metadata and
     278        // append to the message
     279        NodeList doc_nodes = page_classifier.getElementsByTagName(GSXML.DOC_NODE_ELEM);
     280        if (doc_nodes.getLength() > 0)
     281        {
     282            did_documents = true;
     283            Element doc_meta_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, GSPath.appendLink(collection, "DocumentMetadataRetrieve"), lang, uid);
     284            metadata_message.appendChild(doc_meta_request);
     285
     286            Element doc_list = this.doc.createElement(GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER);
     287            doc_meta_request.appendChild(doc_list);
     288
     289            for (int c = 0; c < doc_nodes.getLength(); c++)
     290            {
     291
     292                Element d = this.doc.createElement(GSXML.DOC_NODE_ELEM);
     293                d.setAttribute(GSXML.NODE_ID_ATT, ((Element) doc_nodes.item(c)).getAttribute(GSXML.NODE_ID_ATT));
     294                doc_list.appendChild(d);
     295            }
     296
     297            // create and add in the param list - add all for now
     298            Element doc_param_list = createMetadataParamList(doc_meta_names);
     299            doc_meta_request.appendChild(doc_param_list);
     300
     301        }
     302
     303        // process the metadata requests
     304        Element metadata_response = (Element) this.mr.process(metadata_message);
     305        if (did_classifier)
     306        {
     307            // the classifier one will be the first response
     308            // add the metadata lists for each node back into the
     309            // page_classifier nodes
     310            path = GSPath.appendLink(GSXML.RESPONSE_ELEM, GSXML.CLASS_NODE_ELEM + GSXML.LIST_MODIFIER);
     311            Node pathNode = GSXML.getNodeByPath(metadata_response, path);
     312            if (pathNode == null)
     313            {
     314                return page_response;
     315            }
     316            //NodeList meta_response_cls = (Element)pathNode.getChildNodes(); // can't handle empty elements from converting formatted strings (with empty newlines) into XML
     317            NodeList meta_response_cls = ((Element) pathNode).getElementsByTagName(GSXML.CLASS_NODE_ELEM);
     318            for (int i = 0; i < cl_nodes.getLength(); i++)
     319            {
     320                GSXML.mergeMetadataLists(cl_nodes.item(i), meta_response_cls.item(i));
     321            }
     322        }
     323
     324        if (did_documents)
     325        {
     326            NodeList meta_response_docs = null;
     327            if (!did_classifier)
     328            {
     329                // its the first response
     330                path = GSPath.appendLink(GSXML.RESPONSE_ELEM, GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER);
     331                Node pathNode = GSXML.getNodeByPath(metadata_response, path);
     332                if (pathNode == null)
     333                {
     334                    return page_response;
     335                }
     336
     337                meta_response_docs = pathNode.getChildNodes();
     338
     339            }
     340            else
     341            { // its the second response
     342                Node nodes = GSXML.getChildByTagName(metadata_response.getElementsByTagName(GSXML.RESPONSE_ELEM).item(1), GSXML.DOC_NODE_ELEM + GSXML.LIST_MODIFIER);
     343                if (nodes == null)
     344                {
     345                    return page_response;
     346                }
     347                meta_response_docs = nodes.getChildNodes();
     348            }
     349
     350            for (int i = 0; i < doc_nodes.getLength(); i++)
     351            {
     352                GSXML.mergeMetadataLists(doc_nodes.item(i), meta_response_docs.item(i));
     353            }
     354        }
     355
     356        logger.debug("(GS2BrowseAction) Page:\n" + this.converter.getPrettyString(page_response));
     357        return page_response;
    92358    }
    93    
    94     // get the node that the user has clicked on
    95     String classifier_node = (String)params.get(CLASSIFIER_ARG);
    96    
    97     // if the node is not defined, return the page that we have so far
    98     if (classifier_node ==null || classifier_node.equals("")) {
    99         return page_response;
     359
     360    protected void extractMetadataNames(Element new_format, HashSet doc_meta_names, HashSet class_meta_names)
     361    {
     362
     363        NodeList templates = new_format.getElementsByTagName("gsf:template");
     364        for (int i = 0; i < templates.getLength(); i++)
     365        {
     366            Element template = (Element) templates.item(i);
     367            String match = template.getAttribute("match");
     368            if (match.equals("documentNode"))
     369            {
     370                getRequiredMetadataNames(template, doc_meta_names);
     371            }
     372            else if (match.equals("classifierNode"))
     373            {
     374                getRequiredMetadataNames(template, class_meta_names);
     375            }
     376        }
    100377    }
    101    
    102     // the id of the classifier is the top id of the selected node
    103     String top_id = OID.getTop(classifier_node);
    104     HashSet doc_meta_names = new HashSet();
    105     HashSet class_meta_names = new HashSet();
    106     // add in the defaults
    107     doc_meta_names.add("Title");
    108     class_meta_names.add("Title");
    109    
    110     // add the format info into the response
    111     Element format_elem = (Element)GSXML.getChildByTagName(format_response, GSXML.FORMAT_ELEM);
    112     if (format_elem != null) {
    113        
    114         // find the one for the classifier we are in
    115         Element this_format = GSXML.getNamedElement(format_elem, GSXML.CLASSIFIER_ELEM, GSXML.NAME_ATT, top_id);
    116         if (this_format == null) {
    117         this_format = (Element)GSXML.getChildByTagName(format_elem, GSXML.DEFAULT_ELEM);
    118         }
    119 
    120         if (this_format != null) {
    121         Element new_format = GSXML.duplicateWithNewName(this.doc, this_format, GSXML.FORMAT_ELEM, false);
    122         extractMetadataNames(new_format, doc_meta_names, class_meta_names);
    123         // set the format type
    124         new_format.setAttribute(GSXML.TYPE_ATT, "browse");
    125 
    126         page_response.appendChild(new_format);
    127         }
    128     }
    129    
    130     // find out if this classifier is horizontal at top
    131     Element class_list = (Element)GSXML.getChildByTagName(service_description, GSXML.CLASSIFIER_ELEM+GSXML.LIST_MODIFIER);
    132     Element this_classifier = GSXML.getNamedElement(class_list, GSXML.CLASSIFIER_ELEM, GSXML.NAME_ATT, top_id);
    133     boolean horizontal_at_top = false;
    134     if (!this_classifier.getAttribute("horizontalAtTop").equals("")) {
    135         horizontal_at_top = true;
    136     }
    137     if (top_id.equals(classifier_node) && horizontal_at_top) {
    138         // we have asked for a top node - if the first list is horizontal, we will select the first element of that list
    139         // this is a hack. also it craps out if the classifier really isn't horizontalAtTop. -
    140         classifier_node = classifier_node+".1";
    141            
    142     }
    143 
    144     // get the browse structure for the selected node
    145     Element classify_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
    146     Element classify_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, lang, uid);
    147     classify_message.appendChild(classify_request);
    148        
    149     //Create a parameter list to specify the required structure information
    150     // for now, always get ancestors and children
    151     Element param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
    152     classify_request.appendChild(param_list);
    153     Element param = this.doc.createElement(GSXML.PARAM_ELEM);
    154     param_list.appendChild(param);
    155     param.setAttribute(GSXML.NAME_ATT, "structure");
    156     param.setAttribute(GSXML.VALUE_ATT, "ancestors");
    157     param = this.doc.createElement(GSXML.PARAM_ELEM);
    158     param_list.appendChild(param);
    159     param.setAttribute(GSXML.NAME_ATT, "structure");
    160     param.setAttribute(GSXML.VALUE_ATT, "children");
    161 
    162     // put the classifier node into a classifier node list
    163     Element classifier_list = this.doc.createElement(GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
    164     Element classifier = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
    165     classifier.setAttribute(GSXML.NODE_ID_ATT, classifier_node);
    166     classifier_list.appendChild(classifier);
    167     classify_request.appendChild(classifier_list);
    168        
    169     if (horizontal_at_top && !classifier_node.equals(top_id)) {
    170         // also put the top id in, to get the persistant horizontal info
    171         classifier = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
    172         classifier.setAttribute(GSXML.NODE_ID_ATT, top_id);
    173         classifier_list.appendChild(classifier);
    174     }
    175     // process the request
    176     Element classify_response = (Element)this.mr.process(classify_message);
    177     String path = GSPath.appendLink(GSXML.RESPONSE_ELEM, GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
    178     Element class_node_list = (Element)GSXML.getNodeByPath(classify_response, path);
    179    
    180     path = GSPath.appendLink(GSXML.CLASS_NODE_ELEM, GSXML.NODE_STRUCTURE_ELEM);
    181     // assume that we always get back the top level CL1 node - this becomes the page_classifier node
    182     path = GSPath.appendLink(path, GSXML.CLASS_NODE_ELEM);
    183     Element cl_structure = (Element)GSXML.getNodeByPath(class_node_list,
    184                                 path);
    185     if (cl_structure ==null) {
    186         logger.error("classifier structure request returned no structure");
    187         return page_response;
    188     }   
    189    
    190     Element page_classifier = null;
    191     if (horizontal_at_top && !classifier_node.equals(top_id)) {
    192         // get the info for the top node
    193         Element top_node = GSXML.getNamedElement(class_node_list, GSXML.CLASS_NODE_ELEM, GSXML.NODE_ID_ATT, top_id);
    194         if (top_node !=null) {
    195         path = GSPath.appendLink(GSXML.NODE_STRUCTURE_ELEM, GSXML.CLASS_NODE_ELEM);
    196         Element top_structure = (Element)GSXML.getNodeByPath(top_node, path);       
    197         // add this as the classifier elem
    198         page_classifier = GSXML.duplicateWithNewName(this.doc, top_structure,  GSXML.CLASSIFIER_ELEM, true);
    199         page_response.appendChild(page_classifier);
    200         // now replace the child with the structure from the other request
    201         Element new_classifier = (Element)GSXML.getChildByTagName(cl_structure, GSXML.CLASS_NODE_ELEM);
    202         String replace_name = new_classifier.getAttribute(GSXML.NODE_ID_ATT);
    203        
    204         // find the appropriate child
    205         Element old_classifier = GSXML.getNamedElement(page_classifier, GSXML.CLASS_NODE_ELEM, GSXML.NODE_ID_ATT, replace_name);
    206         page_classifier.replaceChild(this.doc.importNode(new_classifier, true), old_classifier);
    207         page_classifier.setAttribute(GSXML.NAME_ATT, top_id);
    208         } else {
    209         // add the single classifier node as the page classifier
    210         page_classifier = GSXML.duplicateWithNewName(this.doc, cl_structure,  GSXML.CLASSIFIER_ELEM, true);
    211         page_response.appendChild(page_classifier);
    212         page_classifier.setAttribute(GSXML.NAME_ATT, top_id);
    213         }
    214        
    215     } else {
    216         // add the single classifier node as the page classifier
    217         page_classifier = GSXML.duplicateWithNewName(this.doc, cl_structure,  GSXML.CLASSIFIER_ELEM, true);
    218         page_response.appendChild(page_classifier);
    219         page_classifier.setAttribute(GSXML.NAME_ATT, top_id);
    220     }
    221     // get the metadata for each classifier node,
    222     // then for each document node
    223 
    224     Element metadata_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
    225 
    226     boolean did_classifier = false;
    227     boolean did_documents = false;
    228    
    229    
    230     // if there are classifier nodes
    231     // create a metadata request for the classifier, and add it to
    232     // the the message
    233     NodeList cl_nodes = page_classifier.getElementsByTagName(GSXML.CLASS_NODE_ELEM);
    234    
    235     if (cl_nodes.getLength() > 0) {
    236         did_classifier = true;
    237         Element cl_meta_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to+"MetadataRetrieve", lang, uid);
    238         metadata_message.appendChild(cl_meta_request);
    239        
    240         Element new_cl_nodes_list = this.doc.createElement(GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
    241         cl_meta_request.appendChild(new_cl_nodes_list);
    242        
    243         for (int c=0; c<cl_nodes.getLength(); c++) {
    244 
    245         Element cl = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
    246         cl.setAttribute(GSXML.NODE_ID_ATT, ((Element)cl_nodes.item(c)).getAttribute(GSXML.NODE_ID_ATT));
    247         new_cl_nodes_list.appendChild(cl);
    248         }
    249 
    250         // create and add in the param list - for now get all the metadata
    251         // should be based on info sent in from the recept, and the
    252         // format stuff
    253         Element cl_param_list  = createMetadataParamList(class_meta_names);
    254         cl_meta_request.appendChild(cl_param_list);
    255        
    256     }
    257 
    258     // if there are document nodes in the classification (happens
    259     // sometimes), create a second request for document metadata and
    260     // append to the message
    261     NodeList doc_nodes = page_classifier.getElementsByTagName(GSXML.DOC_NODE_ELEM);
    262     if (doc_nodes.getLength() > 0) {
    263         did_documents = true;
    264         Element doc_meta_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, GSPath.appendLink(collection, "DocumentMetadataRetrieve"), lang, uid);
    265         metadata_message.appendChild(doc_meta_request);
    266        
    267         Element doc_list = this.doc.createElement(GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
    268         doc_meta_request.appendChild(doc_list);
    269        
    270         for (int c=0; c<doc_nodes.getLength(); c++) {
    271        
    272         Element d = this.doc.createElement(GSXML.DOC_NODE_ELEM);
    273         d.setAttribute(GSXML.NODE_ID_ATT, ((Element)doc_nodes.item(c)).getAttribute(GSXML.NODE_ID_ATT));
    274         doc_list.appendChild(d);
    275         }
    276 
    277         // create and add in the param list - add all for now
    278         Element doc_param_list  = createMetadataParamList(doc_meta_names);
    279         doc_meta_request.appendChild(doc_param_list);
    280 
    281     }
    282    
    283     // process the metadata requests
    284     Element metadata_response = (Element)this.mr.process(metadata_message);
    285     if (did_classifier) {
    286         // the classifier one will be the first response
    287         // add the metadata lists for each node back into the
    288         // page_classifier nodes
    289         path = GSPath.appendLink(GSXML.RESPONSE_ELEM,
    290                    GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
    291             Node pathNode = GSXML.getNodeByPath(metadata_response, path);
    292             if (pathNode ==null){
    293             return page_response;
    294         }
    295         //NodeList meta_response_cls = (Element)pathNode.getChildNodes(); // can't handle empty elements from converting formatted strings (with empty newlines) into XML
    296         NodeList meta_response_cls = ((Element)pathNode).getElementsByTagName(GSXML.CLASS_NODE_ELEM);
    297         for (int i = 0; i < cl_nodes.getLength(); i++) {
    298         GSXML.mergeMetadataLists(cl_nodes.item(i), meta_response_cls.item(i));
    299         }
    300     }
    301 
    302     if (did_documents) {
    303         NodeList meta_response_docs = null;
    304         if (!did_classifier) {
    305         // its the first response
    306         path = GSPath.appendLink(GSXML.RESPONSE_ELEM,
    307                      GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
    308         Node pathNode = GSXML.getNodeByPath(metadata_response, path);
    309         if (pathNode ==null){
    310             return page_response;
    311                  }
    312 
    313         meta_response_docs = pathNode.getChildNodes();
    314        
    315 
    316         } else { // its the second response
    317                 Node nodes = GSXML.getChildByTagName(metadata_response.getElementsByTagName(GSXML.RESPONSE_ELEM).item(1), GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
    318         if (nodes ==null){
    319             return page_response;
    320                  }
    321         meta_response_docs = nodes.getChildNodes();
    322         }
    323        
    324         for (int i = 0; i < doc_nodes.getLength(); i++) {
    325         GSXML.mergeMetadataLists(doc_nodes.item(i), meta_response_docs.item(i));
    326         }
    327     }
    328        
    329 
    330     logger.debug("(GS2BrowseAction) Page:\n" + this.converter.getPrettyString(page_response));
    331     return page_response;
    332     }
    333 
    334    
    335     protected void extractMetadataNames(Element new_format, HashSet doc_meta_names, HashSet class_meta_names) {
    336    
    337     NodeList templates = new_format.getElementsByTagName("gsf:template");
    338     for (int i=0; i<templates.getLength(); i++) {
    339         Element template = (Element)templates.item(i);
    340         String match = template.getAttribute("match");
    341         if (match.equals("documentNode")) {
    342             getRequiredMetadataNames(template, doc_meta_names);
    343         } else if (match.equals("classifierNode")) {
    344             getRequiredMetadataNames(template, class_meta_names);
    345         }
    346     }
    347     }
    348378
    349379}
    350 
    351 
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