1 | package org.greenstone.gsdl3.action;
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2 |
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3 | import java.util.HashMap;
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4 | import java.util.HashSet;
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5 | import java.util.Iterator;
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6 |
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7 | import org.apache.log4j.Logger;
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8 | import org.greenstone.gsdl3.core.ModuleInterface;
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9 | import org.greenstone.gsdl3.util.Dictionary;
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10 | import org.greenstone.gsdl3.util.GSConstants;
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11 | import org.greenstone.gsdl3.util.GSParams;
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12 | import org.greenstone.gsdl3.util.GSXML;
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13 | import org.greenstone.gsdl3.util.GSXSLT;
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14 | import org.greenstone.gsdl3.util.UserContext;
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15 | import org.greenstone.gsdl3.util.XMLConverter;
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16 | import org.greenstone.gsdl3.util.XMLTransformer;
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17 | import org.w3c.dom.Document;
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18 | import org.w3c.dom.Element;
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19 | import org.w3c.dom.Node;
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20 | import org.w3c.dom.NodeList;
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21 |
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22 | /** base class for Actions */
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23 | abstract public class Action
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24 | {
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25 |
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26 | /** the system set up variables */
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27 | protected HashMap<String, Object> config_params = null;
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28 |
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29 |
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30 | /** a converter class to parse XML and create Docs */
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31 | protected XMLConverter converter = null;
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32 | /** a transformer class in case the action wants to run XSLT itself */
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33 | protected XMLTransformer transformer = null;
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34 | /**
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35 | * a reference to the message router that it must talk to to get info. it
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36 | * may be a communicator acting as a proxy, but it doesn't care about that
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37 | */
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38 | protected ModuleInterface mr = null;
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39 |
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40 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.Action.class.getName());
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41 |
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42 | public Action()
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43 | {
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44 | this.converter = new XMLConverter();
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45 | this.transformer = new XMLTransformer();
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46 | }
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47 |
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48 | /** the config variables must be set before configure is called */
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49 | public void setConfigParams(HashMap<String, Object> params)
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50 | {
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51 | this.config_params = params;
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52 | }
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53 |
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54 | /** sets the message router */
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55 | public void setMessageRouter(ModuleInterface m)
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56 | {
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57 | this.mr = m;
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58 | }
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59 |
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60 | public boolean configure()
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61 | {
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62 | // does nothing yet
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63 | return true;
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64 | }
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65 |
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66 | /**
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67 | * process takes an xml representation of cgi args and returns the page of
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68 | * results - may be in html/xml/other depending on the output att of the
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69 | * request
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70 | */
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71 | public String process(String xml_in)
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72 | {
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73 |
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74 | Document message_doc = this.converter.getDOM(xml_in);
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75 | if (message_doc == null)
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76 | {
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77 | logger.error("Couldn't parse request");
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78 | logger.error(xml_in);
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79 | return null;
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80 | }
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81 | Node result = process(message_doc);
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82 | return this.converter.getString(result);
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83 | }
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84 |
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85 | /** the main process method - must be implemented in subclass */
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86 | abstract public Node process(Node xml_in);
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87 |
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88 | /**
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89 | * tell the param class what its arguments are.
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90 | * if an action has its own arguments, this should add them to
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91 | * the params object - particularly
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92 | * important for args that need to be saved to the session
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93 | */
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94 | public boolean addActionParameters(GSParams params)
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95 | {
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96 | return true;
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97 | }
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98 |
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99 | protected void getRequiredMetadataNames(Element format, HashSet<String> meta_names) {
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100 | GSXSLT.findExtraMetadataNames(format, meta_names);
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101 | }
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102 |
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103 |
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104 | protected Element createMetadataParamList(Document doc, HashSet<String> metadata_names)
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105 | {
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106 | Element param_list = doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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107 |
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108 | Element param = null;
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109 | Iterator<String> i = metadata_names.iterator();
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110 | while (i.hasNext())
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111 | {
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112 | String name = i.next();
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113 | param = doc.createElement(GSXML.PARAM_ELEM);
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114 | param_list.appendChild(param);
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115 | param.setAttribute(GSXML.NAME_ATT, "metadata");
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116 | param.setAttribute(GSXML.VALUE_ATT, name);
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117 |
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118 | }
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119 | return param_list;
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120 | }
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121 |
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122 | protected boolean processErrorElements(Element message, Element page)
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123 | {
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124 | NodeList error_nodes = message.getElementsByTagName(GSXML.ERROR_ELEM);
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125 | if (error_nodes.getLength() == 0)
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126 | {
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127 | return false;
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128 | }
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129 | Document owner = page.getOwnerDocument();
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130 | for (int i = 0; i < error_nodes.getLength(); i++)
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131 | {
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132 | page.appendChild(owner.importNode(error_nodes.item(i), true));
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133 | }
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134 | return true;
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135 | }
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136 |
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137 | /**
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138 | * Takes an XML element and adds the metadata of the current site to it.
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139 | * Useful for adding the current site's metadata to a response before
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140 | * sending it
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141 | *
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142 | * @param element
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143 | * the element to add site metadata to
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144 | * @param lang
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145 | * the current language
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146 | * @param uid
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147 | * the current user id
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148 | */
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149 | protected void addSiteMetadata(Element element, UserContext userContext)
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150 | {
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151 | Document doc = element.getOwnerDocument();
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152 |
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153 | //ADD SITE METADATA
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154 | Element metadata_request = GSXML.createBasicRequest(doc, GSXML.REQUEST_TYPE_DESCRIBE, "", userContext);
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155 | //create the element to put the params in
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156 | Element param_list = doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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157 | // want to get metadataList and displayItemList
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158 | GSXML.addParameterToList(param_list, GSXML.SUBSET_PARAM , GSXML.METADATA_ELEM + GSXML.LIST_MODIFIER);
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159 | GSXML.addParameterToList(param_list, GSXML.SUBSET_PARAM , GSXML.DISPLAY_TEXT_ELEM + GSXML.LIST_MODIFIER);
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160 |
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161 | metadata_request.appendChild(param_list);
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162 | //create the message
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163 | Element metadata_message = doc.createElement(GSXML.MESSAGE_ELEM);
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164 | metadata_message.appendChild(metadata_request);
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165 | //get response
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166 | Element metadata_response_message = (Element) this.mr.process(metadata_message);
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167 | //drill down to response
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168 | Element metadata_response = (Element) GSXML.getChildByTagName(metadata_response_message, GSXML.RESPONSE_ELEM);
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169 | //merge in metadata
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170 | // *************** need to merge the displayItem lists too
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171 | GSXML.mergeMetadataLists(element, metadata_response);
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172 | GSXML.mergeSpecifiedLists(element, metadata_response, GSXML.DISPLAY_TEXT_ELEM);
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173 | }
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174 |
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175 | protected void addInterfaceOptions(Element elem)
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176 | {
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177 | Document doc = elem.getOwnerDocument();
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178 |
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179 | Element documentOptionList = doc.createElement("interfaceOptions");
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180 | for (Object key : this.config_params.keySet())
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181 | {
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182 | Element option = doc.createElement("option");
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183 | option.setAttribute(GSXML.NAME_ATT, (String) key);
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184 | option.setAttribute(GSXML.VALUE_ATT, this.config_params.get(key).toString());
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185 | documentOptionList.appendChild(option);
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186 | }
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187 | elem.appendChild(elem.getOwnerDocument().importNode(documentOptionList, true));
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188 | }
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189 |
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190 | protected Element getFormatInfo(String to, UserContext userContext)
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191 | {
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192 | // Eclipse call hierarchy shows the element returned from this method is
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193 | // subsequently used in a 'importNode'. For this reason it is safe here
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194 | // for call up our own document DOM.
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195 | //
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196 | // If this pattern changes for any reason, then the DOM will need to be
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197 | // passed in as a parameter
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198 |
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199 | Document doc = XMLConverter.newDOM();
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200 |
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201 | Element mr_format_message = doc.createElement(GSXML.MESSAGE_ELEM);
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202 | Element mr_format_request = GSXML.createBasicRequest(doc, GSXML.REQUEST_TYPE_FORMAT, to, userContext);
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203 | mr_format_message.appendChild(mr_format_request);
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204 |
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205 | // process the message
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206 | Element mr_response_message = (Element) this.mr.process(mr_format_message);
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207 | // the response
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208 |
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209 | Element format_response = (Element) GSXML.getChildByTagName(mr_response_message, GSXML.RESPONSE_ELEM);
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210 |
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211 | Element format_elem = (Element) GSXML.getChildByTagName(format_response, GSXML.FORMAT_ELEM);
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212 | if (format_elem != null)
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213 | {
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214 | Element global_format_elem = (Element) GSXML.getChildByTagName(format_response, GSXML.GLOBAL_FORMAT_ELEM);
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215 | if (global_format_elem != null)
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216 | {
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217 | GSXSLT.mergeFormatElements(format_elem, global_format_elem, false);
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218 | }
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219 | }
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220 | return format_elem;
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221 | }
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222 |
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223 | protected String getTextString(String key, String lang, String dictionary, String[] args)
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224 | {
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225 | logger.error("lang = "+lang);
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226 | if (dictionary != null)
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227 | {
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228 | // just try the one specified dictionary
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229 | Dictionary dict = new Dictionary(dictionary, lang);
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230 | String result = dict.get(key, args);
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231 | if (result == null)
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232 | { // not found
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233 | return "_" + key + "_";
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234 | }
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235 | return result;
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236 | }
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237 |
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238 | // otherwise we try class names for dictionary names
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239 | String class_name = this.getClass().getName();
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240 | class_name = class_name.substring(class_name.lastIndexOf('.') + 1);
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241 | Dictionary dict = new Dictionary(class_name, lang);
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242 | String result = dict.get(key, args);
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243 | if (result != null)
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244 | {
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245 | return result;
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246 | }
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247 |
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248 | // we have to try super classes
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249 | Class c = this.getClass().getSuperclass();
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250 | while (result == null && c != null)
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251 | {
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252 | class_name = c.getName();
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253 | class_name = class_name.substring(class_name.lastIndexOf('.') + 1);
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254 | if (class_name.equals("ServiceRack"))
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255 | {
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256 | // this is as far as we go
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257 | break;
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258 | }
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259 | dict = new Dictionary(class_name, lang);
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260 | result = dict.get(key, args);
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261 | c = c.getSuperclass();
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262 | }
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263 | if (result == null)
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264 | {
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265 | return "_" + key + "_";
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266 | }
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267 | return result;
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268 |
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269 | }
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270 |
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271 | }
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