1 | package org.greenstone.gsdl3.gs3build.metadata;
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2 |
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3 | import java.io.PrintWriter;
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4 | import java.util.Iterator;
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5 | import java.util.List;
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6 | import java.util.Map;
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7 | import java.util.ArrayList;
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8 | import java.util.HashMap;
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9 |
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10 | import java.sql.SQLException;
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11 | import java.sql.ResultSet;
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12 |
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13 | import org.w3c.dom.Document;
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14 | import org.w3c.dom.Element;
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15 | import org.w3c.dom.NamedNodeMap;
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16 | import org.w3c.dom.Node;
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17 | import org.w3c.dom.NodeList;
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18 | import org.w3c.dom.Text;
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19 |
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20 | import org.greenstone.gsdl3.gs3build.util.MultiMap;
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21 | import org.greenstone.gsdl3.gs3build.util.XMLTools;
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22 | import org.greenstone.gsdl3.gs3build.util.GS3SQLConnection;
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23 | import org.greenstone.gsdl3.gs3build.database.*;
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24 |
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25 | /**
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26 | * Implement a simple, unordered, namespace in METS.
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27 | *
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28 | * @see: org.greenstone.gsdl3.gs3build.metadata.METSNamespace
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29 | */
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30 |
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31 | public class SimpleNamespace extends METSNamespace
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32 | {
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33 | MultiMap metadataMap;
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34 |
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35 | public SimpleNamespace(String name)
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36 | { super(name);
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37 | this.metadataMap = new MultiMap();
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38 | System.out.println("Namespace " + name);
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39 | }
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40 |
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41 | public SimpleNamespace(String name, METSLocation location)
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42 | { super(name, location);
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43 | this.metadataMap = new MultiMap();
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44 | }
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45 |
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46 | public SimpleNamespace(String name, Element mdWrapTag)
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47 | { super(name);
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48 | this.metadataMap = new MultiMap();
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49 |
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50 | NodeList childNodes = mdWrapTag.getChildNodes();
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51 | for (int c = 0; c < childNodes.getLength(); c ++)
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52 | { // a metadata node
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53 | if (childNodes.item(c).getNodeType() == org.w3c.dom.Node.ELEMENT_NODE)
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54 | { // get the name of the metadata from the node
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55 | String metadataLabel = childNodes.item(c).getNodeName();
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56 |
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57 | // skip blank labels
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58 | // TODO: raise an error: metadata item without metadata label set
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59 | if (metadataLabel == null || metadataLabel.length() == 0)
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60 | { continue;
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61 | }
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62 |
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63 | // build the value
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64 | String metadataValue = "";
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65 |
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66 | Element childElement = (Element) childNodes.item(c);
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67 | for (int i = 0; i < childElement.getChildNodes().getLength(); i ++)
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68 | { metadataValue = metadataValue + childElement.getChildNodes().item(i).toString();
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69 | }
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70 |
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71 | // trim any leading namespace identifiers in "namespace:label" metadata
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72 | if (metadataLabel.startsWith(this.name + ":"))
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73 | { metadataLabel = metadataLabel.substring(this.name.length() + 1);
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74 | }
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75 |
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76 | this.addMetadata(metadataLabel, metadataValue);
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77 | }
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78 | }
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79 | }
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80 |
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81 | public boolean validate(String field, String value)
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82 | { return true;
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83 | }
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84 |
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85 | /**
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86 | * Add a metadata item. Whether the field and value validate for this
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87 | * schema will also be tested.
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88 | *
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89 | * @param <code>String</code> the name of the field to be given the value
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90 | * @param <code>String</code> the value to be assigned
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91 | *
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92 | * @return <code>boolean</code> whether the field value was added. This
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93 | * would return <code>false</code> if the values did not validate,
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94 | * for example.
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95 | */
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96 | public boolean addMetadata(String label, String value)
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97 | { if (!this.validate(label, value)) {
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98 | return false;
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99 | }
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100 |
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101 | this.metadataMap.put(label, value);
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102 | return true;
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103 | }
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104 |
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105 | /**
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106 | * Assign a metadata item. Whether the field and value validate for this
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107 | * schema will also be tested. Any existing metadata for that field will
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108 | * be destroyed if the new value validates.
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109 | *
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110 | * @param <code>String</code> the name of the field to be given the value
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111 | * @param <code>String</code> the value to be assigned
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112 | *
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113 | * @return <code>boolean</code> whether the field value was added. This
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114 | * would return <code>false</code> if the values did not validate,
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115 | * for example.
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116 | */
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117 | public boolean setMetadata(String label, String value)
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118 | { if (!this.validate(label, value))
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119 | { return false;
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120 | }
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121 |
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122 | this.metadataMap.setOnly(label, value);
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123 | return true;
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124 | }
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125 |
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126 | /**
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127 | * Remove all metadata values for a given field name
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128 | *
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129 | * @param <code>String</code> the field to delete
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130 | *
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131 | * @return <code>boolean</code> whether the field was actually deleted;
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132 | * will return <code>true</code> if the field was already empty.
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133 | */
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134 | public boolean removeMetadata(String label)
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135 | { this.metadataMap.remove(label);
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136 | return true;
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137 | }
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138 |
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139 | /**
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140 | * Remove a particular incidence of a given metadata field for a document.
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141 | * If an exact match for the given value is not found, nothing changes.
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142 | * N.B. if a value occurs twice, only the first incidence of it will be
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143 | * deleted from the list.
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144 | *
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145 | * @param <code>String</code> the field to have the value removed
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146 | * @param <code>String</code> the value to be removed from a given field
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147 | *
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148 | * @return <code>boolean</code> <code>true</code> if an actual metadata text
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149 | * is matched against the given value and is thus deleted.
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150 | */
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151 | public boolean removeMetadata(String label, String value)
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152 | { return this.metadataMap.remove(label, value);
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153 | }
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154 |
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155 | /**
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156 | * Get the metadata items for a particular label
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157 | *
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158 | * @param <code>String</code> the label to fetch values for
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159 | *
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160 | * @return <code>List</code> the list of corresponding values. May be
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161 | * <code>null</code>
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162 | */
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163 | public List getMetadata(String label)
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164 | { return this.metadataMap.getAll(label);
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165 | }
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166 |
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167 | /**
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168 | * Write out the metadata to an XML file through a <code>PrintWriter</code>.
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169 | *
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170 | * @param <code>PrintWriter</code> the writer to use.
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171 | */
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172 | public boolean write(PrintWriter writer)
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173 | { // if this is a non-file block of metadata, write it out in long hand
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174 | if (this.location == null)
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175 | { String tag = XMLTools.getOpenTag("mets", "mdWrap");
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176 |
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177 | tag = XMLTools.addAttribute(tag, "MDType", this.name);
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178 | if (this.id != null) {
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179 | tag = XMLTools.addAttribute(tag, "ID", this.id);
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180 | }
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181 | writer.println(tag);
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182 |
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183 | tag = XMLTools.getOpenTag("mets", "xmlData");
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184 | writer.println(tag);
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185 |
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186 | Iterator keys = this.metadataMap.keySet().iterator();
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187 | while (keys.hasNext())
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188 | { String thisKey = keys.next().toString();
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189 | this.writeItem(writer, thisKey);
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190 | }
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191 |
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192 | writer.println(XMLTools.getCloseTag("mets", "xmlData"));
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193 |
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194 | writer.println(XMLTools.getCloseTag("mets", "mdWrap"));
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195 | }
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196 | // otherwise, drop the metadata out in a simplified file-reference
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197 | // form only
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198 | else
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199 | { String tag = XMLTools.getOpenTag("mets","mdRef");
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200 | tag = XMLTools.addAttribute(tag, "LOCTYPE", "URL");
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201 | tag = XMLTools.addAttribute(tag, "xlink:href", location.getLocation().toString());
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202 | tag = XMLTools.addAttribute(tag, "MDType", this.name);
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203 | if (this.id != null) {
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204 | tag = XMLTools.addAttribute(tag, "ID", this.id);
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205 | }
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206 | writer.println(tag);
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207 |
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208 | writer.println("</mets:mdRef>");
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209 | }
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210 | return true;
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211 | }
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212 |
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213 | /**
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214 | * Write out a single element - this may be overloaded to provide for the
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215 | * appropriate formatting for this metadata.
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216 | */
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217 | protected boolean writeItem(PrintWriter writer, String label)
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218 | { if (this.location == null)
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219 | { // just place the metadata in a simple wrapper
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220 | Iterator values = this.metadataMap.getAll(label).iterator();
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221 |
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222 | while (values.hasNext())
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223 | { String value = values.next().toString();
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224 |
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225 | writer.write(XMLTools.getOpenTag(this.name, label));
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226 |
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227 | writer.write(value);
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228 |
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229 | writer.println(XMLTools.getCloseTag(this.name, label));
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230 | }
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231 | }
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232 | else
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233 | { String tag = XMLTools.getOpenTag("mets", "mdRef");
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234 | tag = XMLTools.addAttribute(tag, "LOCTYPE", this.location.getType());
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235 | tag = XMLTools.addAttribute(tag, "xlink:href", this.location.getLocation().toString());
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236 | tag = XMLTools.addAttribute(tag, "MDTYPE", this.getName());
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237 | tag = XMLTools.makeSingleton(tag);
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238 | writer.println(tag);
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239 | }
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240 | return true;
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241 | }
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242 |
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243 | /**
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244 | * Write out the metadata to an SQL database through a <code>GS3SQLConnection</code>.
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245 | *
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246 | * @param <code>GS3SQLConnection</code> the SQL database to use.
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247 | */
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248 | public boolean writeSQL(int parentId, GS3SQLConnection connection)
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249 | { // write the general stuff
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250 | String sqlId;
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251 |
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252 | if (!super.writeSQL(parentId, connection)) {
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253 | return false;
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254 | }
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255 |
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256 | try {
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257 | if (this.id == null) {
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258 | GS3SQLSelect select = new GS3SQLSelect("namespaces");
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259 | select.setWhere(new GS3SQLWhere(new GS3SQLWhereItem("MetadataRef", "=", Integer.toString(parentId), GS3SQLField.INTEGER_TYPE)));
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260 | select.addField("NamespaceRef");
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261 | connection.execute(select.toString());
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262 |
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263 | ResultSet results = connection.getResultSet();
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264 | results.first();
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265 | sqlId = Integer.toString(results.getInt("NamespaceRef"));
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266 | }
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267 | else {
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268 | sqlId = this.id;
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269 | }
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270 |
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271 | // clear all the existing metadata items for this namespace
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272 | GS3SQLDelete delete = new GS3SQLDelete("mdvalues");
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273 | GS3SQLWhere where = new GS3SQLWhere(new GS3SQLWhereItem("NamespaceRef", "=", sqlId, GS3SQLField.INTEGER_TYPE));
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274 | delete.setWhere(where);
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275 | connection.execute(delete.toString());
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276 |
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277 | // write out the metadata for this namespace
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278 | Iterator keys = this.metadataMap.keySet().iterator();
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279 | while (keys.hasNext())
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280 | { String thisKey = keys.next().toString();
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281 |
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282 | Iterator values = this.metadataMap.getAll(thisKey).iterator();
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283 |
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284 | while (values.hasNext())
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285 | { String value = values.next().toString();
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286 |
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287 | GS3SQLInsert insert = new GS3SQLInsert("mdvalues");
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288 | insert.addValue("NamespaceRef", sqlId, GS3SQLField.INTEGER_TYPE);
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289 | insert.addValue("label", thisKey);
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290 | insert.addValue("value", value);
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291 | connection.execute(insert.toString());
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292 | }
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293 | }
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294 | }
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295 | catch (SQLException sql) {
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296 | System.out.println(sql);
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297 | }
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298 | return true;
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299 | }
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300 |
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301 |
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302 | /**
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303 | * <p>Indicate whether this metadata is open to being changed or not.</p>
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304 | * <p>Metadata which is created from a distinct file cannot be changed,
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305 | * only those which have no associated file can be modified.
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306 | *
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307 | * @return <code>boolean</code> whether this namespace can be altered.
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308 | */
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309 | public boolean isEditable()
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310 | { return (this.location == null);
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311 | }
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312 | }
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