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.Element;
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9 | import org.w3c.dom.Document;
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10 |
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11 | // other java stuff
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12 | import java.io.File;
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13 | import java.util.Vector;
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14 | import java.util.HashMap;
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15 | import java.util.HashSet;
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16 | import java.util.Iterator;
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17 |
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18 | import org.apache.log4j.*;
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19 |
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20 | /** base class for Actions */
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21 | abstract public class Action
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22 | {
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23 | /** the system set up variables */
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24 | protected HashMap config_params = null;
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25 | /** container Document to create XML Nodes */
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26 | protected Document doc = null;
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27 | /** a converter class to parse XML and create Docs */
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28 | protected XMLConverter converter = null;
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29 | /**
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30 | * a reference to the message router that it must talk to to get info. it
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31 | * may be a communicator acting as a proxy, but it doesn't care about that
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32 | */
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33 | protected ModuleInterface mr = null;
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34 |
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35 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.Action.class.getName());
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36 |
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37 | public Action()
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38 | {
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39 | this.converter = new XMLConverter();
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40 | this.doc = this.converter.newDOM();
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41 | }
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42 |
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43 | /** the config variables must be set before configure is called */
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44 | public void setConfigParams(HashMap params)
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45 | {
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46 | this.config_params = params;
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47 | }
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48 |
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49 | /** sets the message router */
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50 | public void setMessageRouter(ModuleInterface m)
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51 | {
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52 | this.mr = m;
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53 | }
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54 |
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55 | public boolean configure()
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56 | {
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57 | // does nothing yet
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58 | return true;
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59 | }
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60 |
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61 | /**
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62 | * process takes an xml representation of cgi args and returns the page of
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63 | * results - may be in html/xml/other depending on the output att of the
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64 | * request
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65 | */
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66 | public String process(String xml_in)
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67 | {
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68 |
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69 | Document message_doc = this.converter.getDOM(xml_in);
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70 | if (message_doc == null)
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71 | {
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72 | logger.error("Couldn't parse request");
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73 | logger.error(xml_in);
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74 | return null;
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75 | }
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76 | Node result = process(message_doc);
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77 | return this.converter.getString(result);
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78 | }
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79 |
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80 | /** the main process method - must be implemented in subclass */
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81 | abstract public Node process(Node xml_in);
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82 |
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83 | /**
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84 | * tell the param class what its arguments are if an action has its own
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85 | * arguments, this should add them to the params object - particularly
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86 | * important for args that should not be saved
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87 | */
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88 | public boolean getActionParameters(GSParams params)
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89 | {
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90 | return true;
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91 | }
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92 |
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93 | protected void extractMetadataNames(Element format, HashSet meta_names)
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94 | {
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95 | //NodeList nodes = format.getElementsByTagNameNS("metadata", "http://www.greenstone.org/configformat");
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96 | NodeList metadata_nodes = format.getElementsByTagName("gsf:metadata");
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97 | for (int i = 0; i < metadata_nodes.getLength(); i++)
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98 | {
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99 | Element elem = (Element) metadata_nodes.item(i);
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100 | StringBuffer metadata = new StringBuffer();
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101 | String all = elem.getAttribute("multiple");
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102 | String name = elem.getAttribute("name");
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103 | String select = elem.getAttribute("select");
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104 | String sep = elem.getAttribute("separator");
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105 | if (all.equals("true"))
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106 | {
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107 | metadata.append("all");
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108 | metadata.append(GSConstants.META_RELATION_SEP);
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109 | }
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110 | if (!select.equals(""))
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111 | {
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112 | metadata.append(select);
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113 | metadata.append(GSConstants.META_RELATION_SEP);
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114 | }
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115 | if (!sep.equals(""))
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116 | {
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117 | metadata.append(GSConstants.META_SEPARATOR_SEP);
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118 | metadata.append(sep);
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119 | metadata.append(GSConstants.META_SEPARATOR_SEP);
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120 | metadata.append(GSConstants.META_RELATION_SEP);
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121 | }
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122 |
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123 | metadata.append(name);
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124 | meta_names.add(metadata.toString());
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125 | }
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126 |
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127 | // The XSL tranform for
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128 | // gsf:link type="source"
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129 | // makes use of 'assocfilepath' so need to make sure it's asked for
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130 |
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131 | NodeList link_nodes = format.getElementsByTagName("gsf:link");
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132 | for (int i = 0; i < link_nodes.getLength(); i++)
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133 | {
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134 | Element elem = (Element) link_nodes.item(i);
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135 | String type = elem.getAttribute("type");
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136 | if (type.equals("source"))
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137 | {
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138 | meta_names.add("assocfilepath");
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139 | meta_names.add("srclinkFile");
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140 | }
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141 | }
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142 |
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143 | // get all the metadata necessary for when the user has used "gsf:equivlink"
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144 | // so that we can build up the equivlink from the metadata components it needs
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145 | link_nodes = format.getElementsByTagName("gsf:equivlinkgs3");
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146 | if (link_nodes != null)
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147 | {
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148 |
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149 | String[] equivlink_metanames = { "equivDocIcon", "equivDocLink", "/equivDocLink" };
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150 |
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151 | for (int i = 0; i < equivlink_metanames.length; i++)
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152 | {
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153 | StringBuffer metadata = new StringBuffer();
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154 | metadata.append("all"); // this means the attr multiple = true;
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155 | metadata.append(GSConstants.META_RELATION_SEP);
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156 |
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157 | metadata.append(GSConstants.META_SEPARATOR_SEP);
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158 | metadata.append(','); // attr separator = ","
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159 | metadata.append(GSConstants.META_SEPARATOR_SEP);
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160 | metadata.append(GSConstants.META_RELATION_SEP);
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161 |
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162 | // the name of the metadata we're retrieving
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163 | metadata.append(equivlink_metanames[i]);
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164 | meta_names.add(metadata.toString());
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165 | }
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166 | }
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167 | }
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168 |
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169 | protected Element createMetadataParamList(HashSet metadata_names)
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170 | {
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171 | Element param_list = this.doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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172 |
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173 | Element param = null;
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174 | Iterator i = metadata_names.iterator();
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175 | while (i.hasNext())
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176 | {
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177 | String name = (String) i.next();
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178 | param = this.doc.createElement(GSXML.PARAM_ELEM);
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179 | param_list.appendChild(param);
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180 | param.setAttribute(GSXML.NAME_ATT, "metadata");
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181 | param.setAttribute(GSXML.VALUE_ATT, name);
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182 |
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183 | }
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184 | return param_list;
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185 | }
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186 |
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187 | protected boolean processErrorElements(Element message, Element page)
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188 | {
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189 | NodeList error_nodes = message.getElementsByTagName(GSXML.ERROR_ELEM);
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190 | if (error_nodes.getLength() == 0)
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191 | {
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192 | return false;
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193 | }
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194 | Document owner = page.getOwnerDocument();
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195 | for (int i = 0; i < error_nodes.getLength(); i++)
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196 | {
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197 | page.appendChild(owner.importNode(error_nodes.item(i), true));
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198 | }
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199 | return true;
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200 | }
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201 |
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202 | /**
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203 | * Takes an XML element and adds the metadata of the current site to it.
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204 | * Useful for adding the current site's metadata to a response before
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205 | * sending it
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206 | *
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207 | * @param element
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208 | * the element to add site metadata to
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209 | * @param lang
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210 | * the current language
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211 | * @param uid
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212 | * the current user id
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213 | */
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214 | protected void addSiteMetadata(Element element, String lang, String uid)
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215 | {
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216 | //ADD SITE METADATA
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217 | Element metadata_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, "", lang, uid);
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218 | //create a hashmap of params
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219 | HashMap subset_params = new HashMap(1);
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220 | subset_params.put(GSXML.SUBSET_PARAM, GSXML.METADATA_ELEM + GSXML.LIST_MODIFIER);
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221 | //create the element to put the params in
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222 | Element param_list = this.doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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223 | //put them in
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224 | GSXML.addParametersToList(this.doc, param_list, subset_params);
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225 | metadata_request.appendChild(param_list);
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226 | //create the message
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227 | Element metadata_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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228 | metadata_message.appendChild(metadata_request);
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229 | //get response
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230 | Element metadata_response_message = (Element) this.mr.process(metadata_message);
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231 | //drill down to response
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232 | Element metadata_response = (Element) GSXML.getChildByTagName(metadata_response_message, GSXML.RESPONSE_ELEM);
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233 | //merge in metadata
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234 | GSXML.mergeMetadataLists(element, metadata_response);
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235 | }
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236 |
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237 | }
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