[5258] | 1 | package org.greenstone.gsdl3.service;
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| 2 |
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| 3 |
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| 4 | // Greenstone classes
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| 5 | import org.greenstone.gsdl3.util.*;
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| 6 |
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| 7 | // XML classes
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| 8 | import org.w3c.dom.Document;
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| 9 | import org.w3c.dom.Element;
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| 10 | import org.w3c.dom.Node;
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| 11 | import org.w3c.dom.Attr;
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| 12 | import org.w3c.dom.Text;
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| 13 | import org.w3c.dom.NodeList;
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| 14 | import org.w3c.dom.NamedNodeMap;
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| 15 |
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| 16 | // General Java classes
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| 17 | import java.io.File;
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| 18 | import java.util.Vector;
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| 19 | import java.util.HashMap;
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| 20 |
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[13124] | 21 | import org.apache.log4j.*;
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[5258] | 22 |
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| 23 | public class XMLRetrieve extends ServiceRack {
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| 24 |
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[13270] | 25 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.XMLRetrieve.class.getName());
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[5258] | 26 | protected static final String CONTENT_SERVICE = "DocumentContentRetrieve";
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| 27 | protected static final String METADATA_SERVICE = "DocumentMetadataRetrieve";
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| 28 | protected static final String STRUCTURE_SERVICE = "DocumentStructureRetrieve";
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| 29 |
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| 30 | protected String toc_xsl_name = "";
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| 31 | protected String document_encoding = "";
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[5964] | 32 | protected String document_root_tag = "";
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| 33 |
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[5258] | 34 | protected Element collection_doc_list = null;
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[5964] | 35 |
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[5258] | 36 | protected boolean provide_content = true;
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| 37 | protected boolean provide_structure = true;
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| 38 | protected boolean provide_metadata = true;
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| 39 |
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| 40 |
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| 41 | public boolean configure(Element info, Element extra_info) {
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[10093] | 42 | if (!super.configure(info, extra_info)){
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| 43 | return false;
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| 44 | }
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[13124] | 45 | logger.info("configuring XMLRetrieve...");
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[5258] | 46 | // look for the parameters
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| 47 | Element param_list = (Element)GSXML.getChildByTagName(info, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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| 48 | HashMap params;
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| 49 | String services_to_provide = "";
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| 50 | if (param_list != null) {
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| 51 | params = GSXML.extractParams(param_list, false);
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| 52 | this.toc_xsl_name = (String)params.get("tocXSLT");
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| 53 | this.document_encoding = (String)params.get("documentEncoding");
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[5964] | 54 | this.document_root_tag = (String)params.get("documentRootTag");
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[5258] | 55 | services_to_provide = (String)params.get("provideServices");
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| 56 | }
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| 57 | if (this.toc_xsl_name == null || this.toc_xsl_name.equals("")) {
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| 58 | this.toc_xsl_name = "default_toc";
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| 59 | }
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| 60 | this.toc_xsl_name = this.toc_xsl_name+".xsl";
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| 61 |
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| 62 | if (this.document_encoding == null || this.document_encoding.equals("")) {
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| 63 | this.document_encoding = "UTF-8";
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| 64 | }
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| 65 |
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| 66 | if (services_to_provide != null && !services_to_provide.equals("")) {
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| 67 | if (services_to_provide.indexOf("content")==-1) {
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| 68 | provide_content = false;
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| 69 | }
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| 70 | if (services_to_provide.indexOf("metadata")==-1) {
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| 71 | provide_metadata = false;
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| 72 | }
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| 73 | if (services_to_provide.indexOf("structure")==-1) {
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| 74 | provide_structure = false;
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| 75 | }
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| 76 |
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| 77 | }
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| 78 |
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| 79 | // set up short_service_info_ - for now just has name and type
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| 80 | Element retrieve_service;
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| 81 | if (provide_content) {
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| 82 | retrieve_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 83 | retrieve_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 84 | retrieve_service.setAttribute(GSXML.NAME_ATT, CONTENT_SERVICE);
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| 85 | this.short_service_info.appendChild(retrieve_service);
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| 86 | }
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| 87 | if (provide_metadata) {
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| 88 | retrieve_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 89 | retrieve_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 90 | retrieve_service.setAttribute(GSXML.NAME_ATT, METADATA_SERVICE);
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| 91 | this.short_service_info.appendChild(retrieve_service);
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| 92 | }
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| 93 | if (provide_structure) {
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| 94 | retrieve_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 95 | retrieve_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 96 | retrieve_service.setAttribute(GSXML.NAME_ATT, STRUCTURE_SERVICE);
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| 97 | this.short_service_info.appendChild(retrieve_service);
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| 98 | }
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| 99 | // find the doc list from the extra_info and keep it - should this be in collect.cfg or build.cfg??
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| 100 | collection_doc_list = (Element)GSXML.getChildByTagName(extra_info, GSXML.DOCUMENT_ELEM+GSXML.LIST_MODIFIER);
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| 101 |
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[10089] | 102 | GSEntityResolver resolver = new GSEntityResolver();
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| 103 | resolver.setClassLoader(this.class_loader);
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| 104 | this.converter.setEntityResolver(resolver);
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[5258] | 105 | return true;
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| 106 | }
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| 107 |
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| 108 | // this may get called but is not useful in the case of retrieve services
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| 109 | protected Element getServiceDescription(String service_id, String lang, String subset) {
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| 110 |
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| 111 | Element retrieve_service = this.doc.createElement(GSXML.SERVICE_ELEM);
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| 112 | retrieve_service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
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| 113 | retrieve_service.setAttribute(GSXML.NAME_ATT, service_id);
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| 114 | return retrieve_service;
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| 115 | }
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| 116 |
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| 117 | protected Element processDocumentContentRetrieve(Element request) {
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| 118 | Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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| 119 | result.setAttribute(GSXML.FROM_ATT, CONTENT_SERVICE);
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| 120 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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| 121 |
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| 122 | Element doc_list = (Element)GSXML.getChildByTagName(request, GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 123 | if (doc_list == null) {
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| 124 | return result;
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| 125 | }
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| 126 | Element result_doc_list = (Element)this.doc.importNode(doc_list, true);
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| 127 | result.appendChild(result_doc_list);
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| 128 |
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| 129 | NodeList docs = result_doc_list.getElementsByTagName(GSXML.DOC_NODE_ELEM);
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| 130 | for (int i=0; i<docs.getLength(); i++) {
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| 131 |
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| 132 | Element doc = (Element)docs.item(i);
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| 133 | Element content = this.doc.createElement(GSXML.NODE_CONTENT_ELEM);
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| 134 | doc.appendChild(content);
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| 135 |
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| 136 | String node_id = doc.getAttribute(GSXML.NODE_ID_ATT);
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| 137 | String doc_name = getWorkName(node_id);
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| 138 |
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| 139 | Element doc_elem = loadDocument(doc_name); // should perhaps cache the read in docs??
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| 140 | if (doc_elem == null) {
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| 141 | continue;
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| 142 | }
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| 143 |
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[5964] | 144 |
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[5258] | 145 | // if we have asked for the whole doc, just append it
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| 146 | if (doc_name.equals(node_id)) {
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| 147 | content.appendChild(this.doc.importNode(doc_elem, true));
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| 148 | continue;
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| 149 | }
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| 150 |
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| 151 | // else we only want a sub section
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| 152 |
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| 153 | Element section = getSection(doc_elem, node_id);
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| 154 | if (section != null) {
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| 155 | content.appendChild(this.doc.importNode(section, true));
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| 156 | }
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| 157 |
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| 158 | } // for each doc
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| 159 |
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| 160 | return result;
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| 161 |
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| 162 | }
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| 163 |
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| 164 | protected Element processDocumentStructureRetrieve(Element request) {
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| 165 | Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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| 166 | result.setAttribute(GSXML.FROM_ATT, STRUCTURE_SERVICE);
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| 167 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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| 168 |
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| 169 | Element doc_list = (Element)GSXML.getChildByTagName(request, GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 170 | if (doc_list == null) {
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[13124] | 171 | logger.error("no documents specified in the request. ");
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[5258] | 172 | return result;
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| 173 | }
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| 174 |
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| 175 | Element result_doc_list = (Element)this.doc.importNode(doc_list, true);
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| 176 | result.appendChild(result_doc_list);
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| 177 | // first look for the stylesheet in the collection
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| 178 | File stylesheet = new File(GSFile.collStylesheetFile(this.site_home, this.cluster_name, this.toc_xsl_name));
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| 179 | if (!stylesheet.exists()) {
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| 180 | // now try in the site
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| 181 | stylesheet = new File(GSFile.siteStylesheetFile(this.site_home, this.toc_xsl_name));
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| 182 | }
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| 183 | if (!stylesheet.exists()) {
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[13124] | 184 | logger.error("couldn't find the stylesheet file to produce the table of contents:"+stylesheet.getPath());
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[5258] | 185 | return result;
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| 186 | }
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| 187 |
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| 188 | // for now, we dont have any params, and we always return the structure of the whole document
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| 189 |
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| 190 | XMLTransformer transformer = new XMLTransformer();
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| 191 | NodeList docs = result_doc_list.getElementsByTagName(GSXML.DOC_NODE_ELEM);
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| 192 |
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| 193 | for (int i=0; i<docs.getLength(); i++) {
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| 194 |
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| 195 | Element doc = (Element)docs.item(i);
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| 196 |
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| 197 | Element structure = this.doc.createElement(GSXML.NODE_STRUCTURE_ELEM);
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| 198 | doc.appendChild(structure);
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| 199 | String doc_name = doc.getAttribute(GSXML.NODE_ID_ATT);
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| 200 | // make sure we are at the top level
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| 201 | doc_name = getWorkName(doc_name);
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| 202 |
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| 203 | File doc_file = new File(GSFile.collectionIndexDir(this.site_home, this.cluster_name)+File.separator+"text"+File.separatorChar+doc_name+".xml");
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| 204 |
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| 205 | if (!doc_file.exists()) {
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[13124] | 206 | logger.error("couldn't find file in coll "+this.cluster_name +", file "+doc_name+".xml");
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[5258] | 207 | } else {
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| 208 | try {
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| 209 | Node toc = transformer.transform(stylesheet, doc_file);
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| 210 | structure.appendChild(this.doc.importNode(toc, true));
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| 211 | } catch (Exception e) {
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[13124] | 212 | logger.error("couldn't transform the document to get the toc");
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[5258] | 213 | }
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| 214 | }
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| 215 |
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| 216 | }
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| 217 |
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| 218 | return result;
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| 219 |
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| 220 | }
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| 221 |
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| 222 | // this just extracts a bit of text from the section to use as the Title
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| 223 | // this should be overwritten for any format that has something more suitable
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| 224 | protected Element processDocumentMetadataRetrieve(Element request) {
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| 225 | Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
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| 226 | result.setAttribute(GSXML.FROM_ATT, METADATA_SERVICE);
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| 227 | result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
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| 228 |
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| 229 | Element doc_list = (Element)GSXML.getChildByTagName(request, GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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| 230 | if (doc_list == null) {
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[13124] | 231 | logger.error("no documents in the request");
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[5258] | 232 | return result;
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| 233 | }
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| 234 |
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| 235 | Element result_doc_list = (Element)this.doc.importNode(doc_list, true);
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| 236 | result.appendChild(result_doc_list);
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| 237 |
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| 238 | Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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| 239 | if (param_list == null) {
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[13124] | 240 | logger.error("no metadata in the request");
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[5258] | 241 | return result;
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| 242 | }
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| 243 |
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| 244 | Vector meta_name_list = new Vector();
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| 245 | boolean all_metadata = false;
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| 246 | // Process the request parameters
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[14225] | 247 | Element param = GSXML.getFirstElementChild(param_list);//(Element) param_list.getFirstChild();
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[5258] | 248 | while (param != null) {
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| 249 | // Identify the metadata information desired
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| 250 | if (param.getAttribute(GSXML.NAME_ATT).equals("metadata")) {
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| 251 | String metadata = GSXML.getValue(param);
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| 252 | if (metadata.equals("all")) {
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| 253 | all_metadata = true;
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| 254 | break;
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| 255 | }
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| 256 | meta_name_list.add(metadata);
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| 257 | }
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| 258 | param = (Element) param.getNextSibling();
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| 259 | }
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| 260 |
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| 261 | NodeList docs = result_doc_list.getElementsByTagName(GSXML.DOC_NODE_ELEM);
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| 262 | for (int i=0; i<docs.getLength(); i++) {
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| 263 | Element doc = (Element)docs.item(i);
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| 264 | String node_id = doc.getAttribute(GSXML.NODE_ID_ATT);
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| 265 | String doc_name = getWorkName(node_id);
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| 266 |
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| 267 | Element metadata_list = getMetadata(node_id, all_metadata, meta_name_list);
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| 268 | doc.appendChild(metadata_list);
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| 269 | }
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| 270 |
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| 271 | return result;
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| 272 | }
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| 273 |
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| 274 | protected Element loadDocument(String doc_name) {
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| 275 | // try to find the document
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| 276 | File doc_file = new File(GSFile.collectionIndexDir(this.site_home, this.cluster_name)+File.separator+"text"+File.separatorChar+doc_name+".xml");
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| 277 |
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| 278 | if (!doc_file.exists()) {
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[13124] | 279 | logger.info("couldn't find file in coll "+this.cluster_name +", file "+doc_name+".xml");
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[5258] | 280 | return null;
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| 281 | }
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| 282 |
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| 283 | Document the_doc = null;
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| 284 | try {
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| 285 | the_doc = this.converter.getDOM(doc_file, this.document_encoding);
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| 286 | } catch (Exception e) {
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[13124] | 287 | logger.error("couldn't create a DOM from file "+doc_file.getPath());
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[5258] | 288 | return null;
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| 289 | }
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| 290 |
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| 291 | return the_doc.getDocumentElement();
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| 292 |
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| 293 | }
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| 294 |
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| 295 |
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| 296 | protected Element getSection(Element doc_elem, String node_id) {
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| 297 | String [] bits = node_id.split("\\.");
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| 298 | if (bits.length > 4) {
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[13124] | 299 | logger.error("badly formatted node id ("+node_id +"), cant retrieve the section");
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[5258] | 300 | return null;
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| 301 | }
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| 302 |
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| 303 | String id="";
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| 304 | String tagname = "";
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| 305 | String scope = "";
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| 306 | if (bits.length==2) {
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| 307 | tagname = bits[1];
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| 308 | } else {
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| 309 | scope = bits[1];
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| 310 | tagname = bits[2];
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| 311 |
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| 312 | if (bits.length == 4) {
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| 313 | id = bits[3];
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| 314 | }
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| 315 | }
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| 316 | scope = translateScope(scope);
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| 317 | Element top=null;
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| 318 | if (!scope.equals("")) {
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| 319 | top = (Element)GSXML.getNodeByPath(doc_elem, scope);
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| 320 | if (top == null) {
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| 321 | // something gone wrong
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| 322 | return null;
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| 323 | }
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| 324 | } else {
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| 325 | top = doc_elem;
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| 326 | }
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| 327 |
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| 328 | NodeList elements = top.getElementsByTagName(tagname);
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| 329 | if (elements.getLength() == 0) {
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| 330 | return null;
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| 331 | }
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| 332 | // no id, just return the first one
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| 333 | if (id.equals("")) {
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| 334 | return (Element)elements.item(0);
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| 335 | }
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| 336 | // have an id, need to check and find the right one.
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| 337 | for (int i=0; i<elements.getLength();i++) {
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| 338 | Element e = (Element)elements.item(i);
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| 339 | if (e.getAttribute("gs3:id").equals(id)) {
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| 340 | return e;
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| 341 | }
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| 342 | }
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| 343 | return null;
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| 344 |
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| 345 | }
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| 346 |
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| 347 | protected Element getMetadata(String node_id, boolean all, Vector meta_name_list) {
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| 348 |
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| 349 | // our default strategy here is to only return Title and root:Title
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| 350 | // ignore all others
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| 351 | // the title of a section is just a little bit of the text inside it.
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[6872] | 352 | // the root_Title is the title from the doc info in the config file
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[5258] | 353 | Element metadata_list = this.doc.createElement(GSXML.METADATA_ELEM+ GSXML.LIST_MODIFIER);
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| 354 | String doc_name = getWorkName(node_id);
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| 355 | boolean node_is_root = false;
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| 356 | if (doc_name.equals(node_id)) {
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| 357 | node_is_root = true;
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| 358 | }
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| 359 |
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| 360 | Element this_doc = GSXML.getNamedElement(this.collection_doc_list, GSXML.DOCUMENT_ELEM, GSXML.NAME_ATT, doc_name);
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| 361 | Element doc_meta_list = (Element) GSXML.getChildByTagName(this_doc, GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
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| 362 |
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| 363 | boolean get_section_title = false;
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| 364 |
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| 365 | if (all) {
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| 366 | if (node_is_root) {
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| 367 | return (Element)this.doc.importNode(doc_meta_list, true);
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| 368 | } else {
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| 369 | get_section_title = true;
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| 370 | }
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| 371 |
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| 372 | } else {
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| 373 | // have to process metadata one by one
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| 374 | for (int i=0; i<meta_name_list.size(); i++) {
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| 375 | String meta_name = (String) meta_name_list.elementAt(i);
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| 376 | String actual_meta_name = meta_name;
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[5964] | 377 | if (meta_name.startsWith("root_")) {
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[5258] | 378 | actual_meta_name = meta_name.substring(5);
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| 379 | } else {
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| 380 | // its a section level one - check to see if doc is root
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| 381 | if (!node_is_root) {
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| 382 | if (meta_name.equals("Title")) {
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| 383 | get_section_title = true;
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| 384 | }
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| 385 | continue; // move on to teh next metadata
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| 386 | }
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| 387 | }
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| 388 |
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| 389 | // here, we look for the specific meta elem in doc_meta_list
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| 390 | Element meta_item = GSXML.getNamedElement(doc_meta_list, GSXML.METADATA_ELEM, GSXML.NAME_ATT, actual_meta_name);
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| 391 | if (meta_item != null) {
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| 392 | meta_item = (Element)this.doc.importNode(meta_item, true);
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| 393 | meta_item.setAttribute(GSXML.NAME_ATT, meta_name);
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| 394 | metadata_list.appendChild(meta_item);
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| 395 | }
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| 396 | } // for each metadata
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| 397 | }
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| 398 |
|
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| 399 | // now we have processed all teh doc metadata, just have section one to go, if needed
|
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| 400 | if (get_section_title) {
|
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| 401 |
|
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| 402 | Element doc_elem = loadDocument(doc_name);
|
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| 403 | if (doc_elem != null) {
|
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| 404 | Element section = getSection(doc_elem, node_id);
|
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| 405 | if (section != null) {
|
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| 406 | Element title_meta = extractTitleMeta(section);
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[5964] | 407 | if (title_meta != null) {
|
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| 408 | metadata_list.appendChild(title_meta);
|
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| 409 | }
|
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[5258] | 410 | }
|
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| 411 | }
|
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| 412 |
|
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| 413 | }
|
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| 414 | return metadata_list;
|
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| 415 | }
|
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| 416 |
|
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| 417 | protected Element extractTitleMeta(Element section) {
|
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| 418 | Element meta_elem = this.doc.createElement(GSXML.METADATA_ELEM);
|
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| 419 | meta_elem.setAttribute(GSXML.NAME_ATT, "Title");
|
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| 420 |
|
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| 421 | String title = "dummy title";
|
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| 422 | Text t = this.doc.createTextNode(title);
|
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| 423 | meta_elem.appendChild(t);
|
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| 424 | return meta_elem;
|
---|
| 425 |
|
---|
| 426 | }
|
---|
| 427 | // some methods for handling nodeIDs - they may be different for different colls, so they can be overwritten
|
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| 428 |
|
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| 429 | // the full default nodeID looks like work.scope.tag.id
|
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| 430 | // the shorter versions are work, work.tag, work.scope.tag
|
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| 431 | protected String getWorkName(String node_id) {
|
---|
| 432 | int pos = node_id.indexOf('.');
|
---|
| 433 | if (pos == -1) {
|
---|
| 434 | return node_id;
|
---|
| 435 | }
|
---|
| 436 | return node_id.substring(0, pos);
|
---|
| 437 | }
|
---|
| 438 |
|
---|
| 439 | // this assumes that the scope refers to a top level node - this may be overwritten if the scope bit in the id is a shorthand of some sort
|
---|
| 440 | protected String translateScope(String scope) {
|
---|
[5964] | 441 | if (this.document_root_tag != null) {
|
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| 442 | return GSPath.appendLink(this.document_root_tag, scope);
|
---|
| 443 | }
|
---|
[5258] | 444 | return scope;
|
---|
| 445 | }
|
---|
| 446 |
|
---|
| 447 | }
|
---|
[5964] | 448 |
|
---|