1 | package org.greenstone.gsdl3.action;
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2 |
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3 | import org.greenstone.gsdl3.core.ModuleInterface;
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4 | import org.greenstone.gsdl3.util.*;
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5 | // XML classes
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6 | import org.w3c.dom.Node;
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7 | import org.w3c.dom.NodeList;
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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 |
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11 | import java.util.HashMap;
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12 | import java.io.File;
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13 |
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14 | import org.apache.log4j.*;
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15 |
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16 | /** action class for handling applets */
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17 | public class AppletAction extends Action
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18 | {
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19 |
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20 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.AppletAction.class.getName());
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21 |
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22 | public Node process(Node message_node)
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23 | {
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24 |
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25 | Element message = this.converter.nodeToElement(message_node);
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26 |
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27 | Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
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28 | Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
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29 | Element page_response = this.doc.createElement(GSXML.RESPONSE_ELEM);
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30 | result.appendChild(page_response);
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31 |
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32 | // get the collection and service params
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33 | Element cgi_param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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34 | HashMap params = GSXML.extractParams(cgi_param_list, false);
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35 |
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36 | // request_type is display (d) or request (r)
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37 | String request_type = (String) params.get(GSParams.REQUEST_TYPE);
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38 | if (!request_type.equals("d") && !request_type.equals("r"))
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39 | {
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40 | logger.error("AppletAction Error: the rt arg should be either d or r, instead it was " + request_type + "!");
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41 | return result;
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42 | }
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43 |
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44 | String collection = (String) params.get(GSParams.COLLECTION);
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45 | boolean coll_specified = true;
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46 | String service_name = (String) params.get(GSParams.SERVICE);
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47 | String lang = request.getAttribute(GSXML.LANG_ATT);
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48 | String uid = request.getAttribute(GSXML.USER_ID_ATT);
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49 | String to = null;
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50 | if (collection == null || collection.equals(""))
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51 | {
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52 | coll_specified = false;
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53 | to = service_name;
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54 | }
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55 | else
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56 | {
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57 | to = GSPath.appendLink(collection, service_name);
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58 | }
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59 |
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60 | if (request_type.equals("r"))
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61 | {
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62 | // we are processing stuff for the applet send a message to the service, type="query", and take out the something element, and return that as our result - the applet must take xml
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63 |
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64 | Element mr_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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65 | Element mr_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, lang, uid);
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66 | mr_message.appendChild(mr_request);
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67 | // just append all the params for now - should filter out unneeded ones
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68 | mr_request.appendChild(this.doc.importNode(cgi_param_list, true));
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69 |
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70 | // process the request
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71 | Element mr_response = (Element) this.mr.process(mr_message);
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72 | // get the applet data out and pass it back as is.
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73 | String path = GSPath.appendLink(GSXML.RESPONSE_ELEM, GSXML.APPLET_DATA_ELEM);
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74 | Element applet_info = GSXML.getFirstElementChild(GSXML.getNodeByPath(mr_response, path));
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75 | //Element applet_info = (Element)GSXML.getNodeByPath(mr_response, path).getFirstChild();
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76 | return applet_info;
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77 |
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78 | }
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79 |
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80 | // get the applet description, and the collection info if a collection is specified
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81 |
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82 | Element mr_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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83 | Element applet_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, lang, uid);
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84 | mr_message.appendChild(applet_request);
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85 |
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86 | Element mr_response = (Element) this.mr.process(mr_message);
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87 |
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88 | // add in the applet info
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89 | String path = GSPath.appendLink(GSXML.RESPONSE_ELEM, GSXML.SERVICE_ELEM);
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90 | //path = GSPath.appendLink(path, GSXML.APPLET_ELEM);
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91 | Element service_elem = (Element) this.doc.importNode(GSXML.getNodeByPath(mr_response, path), true);
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92 | Element applet_elem = (Element) GSXML.getChildByTagName(service_elem, GSXML.APPLET_ELEM);
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93 | // must handle any params that have values that are not
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94 | // necessarily known by the service
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95 | // should this be done here or by web receptionist??
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96 | // cant really have an applet without web?
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97 | editLocalParams(applet_elem, (String) config_params.get(GSConstants.LIBRARY_NAME), collection);
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98 | page_response.appendChild(service_elem);
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99 |
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100 | return result;
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101 |
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102 | }
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103 |
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104 | /**
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105 | * this method looks through the PARAMs of the applet description for
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106 | * 'library' or 'collection'. If found, the params are set to the
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107 | * appropriate values should this be done here or in the receptionist?
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108 | */
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109 | protected void editLocalParams(Element description, String library_name, String full_collection_name)
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110 | {
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111 |
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112 | Node child = description.getFirstChild();
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113 | while (child != null)
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114 | {
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115 | if (child.getNodeType() == Node.ELEMENT_NODE)
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116 | {
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117 | String param = child.getNodeName();
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118 | if (param.equals("PARAM") || param.equals("param"))
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119 | {
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120 | String name = ((Element) child).getAttribute("NAME");
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121 | if (name == null || name.equals(""))
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122 | {
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123 | // somethings wrong!!
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124 | }
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125 | else if (name.equals("library"))
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126 | {
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127 | ((Element) child).setAttribute("VALUE", library_name);
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128 | }
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129 | else if (name.equals("collection"))
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130 | {
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131 | ((Element) child).setAttribute("VALUE", full_collection_name);
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132 | }
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133 |
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134 | }
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135 | }
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136 | child = child.getNextSibling();
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137 | }
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138 | }
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139 |
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140 | }
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