[5800] | 1 | package org.greenstone.gsdl3.gs3build.metadata;
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| 2 |
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| 3 | import java.util.List;
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| 4 | import java.util.ArrayList;
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| 5 | import java.util.Iterator;
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| 6 |
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| 7 | import java.io.PrintWriter;
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| 8 |
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| 9 | import java.sql.SQLException;
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[5945] | 10 | import java.sql.ResultSet;
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[5800] | 11 |
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| 12 | import org.w3c.dom.Document;
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| 13 | import org.w3c.dom.Element;
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| 14 | import org.w3c.dom.NamedNodeMap;
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| 15 | import org.w3c.dom.Node;
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| 16 | import org.w3c.dom.NodeList;
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| 17 | import org.w3c.dom.Text;
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| 18 |
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| 19 | import org.greenstone.gsdl3.gs3build.doctypes.DocumentInterface;
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| 20 |
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| 21 | import org.greenstone.gsdl3.gs3build.util.XMLTools;
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| 22 | import org.greenstone.gsdl3.gs3build.database.*;
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| 23 |
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| 24 | /**
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| 25 | * Support the descriptive metadata of a given document
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| 26 | *
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| 27 | * The descriptive metadata can occur multiple times, so this 'wrapper' is
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| 28 | * in fact a holder for a number of individual metadata sets. Individual
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| 29 | * metadata groups are found in METSNamespace items.
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| 30 | *
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| 31 | *
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| 32 | */
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| 33 |
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| 34 | import org.greenstone.gsdl3.gs3build.util.MultiMap;
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| 35 |
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| 36 | public class METSDescriptive
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[8702] | 37 | {
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| 38 | MultiMap map;
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| 39 | String ID;
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| 40 | String name;
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| 41 |
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| 42 | public METSDescriptive(String ID, String name)
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| 43 | {
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| 44 | this.map = new MultiMap();
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| 45 | this.ID = ID;
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| 46 | this.name = name;
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[5945] | 47 | }
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[8702] | 48 |
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| 49 | public String getID()
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| 50 | {
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| 51 | return this.ID;
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[5945] | 52 | }
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[8702] | 53 |
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| 54 | public String getName()
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| 55 | {
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| 56 | return this.name;
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[5945] | 57 | }
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[8702] | 58 |
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| 59 | public void addNamespace(METSNamespace namespace)
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| 60 | {
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| 61 | this.map.put(namespace.getName(), namespace);
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[5945] | 62 | }
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[8702] | 63 |
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| 64 | public METSNamespace getNamespace(String namespace)
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| 65 | {
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| 66 | return (METSNamespace) this.map.get(namespace);
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[6738] | 67 | }
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[8702] | 68 |
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| 69 | /**
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| 70 | * Get the version of a metadata namespace that can be used for
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| 71 | * adding new values to the document. Remember, each namespace may
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| 72 | * occur more than once, but only one of the occurrences can be 'open'.
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| 73 | *
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| 74 | * @param <code>String</code> the name of the namespace
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| 75 | */
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| 76 | public METSNamespace getOpenNamespace(String namespace)
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| 77 | {
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| 78 | if (this.map.getAll(namespace) == null) {
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| 79 | return null;
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| 80 | }
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| 81 |
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| 82 | Iterator namespaces = ((List) this.map.getAll(namespace)).iterator();
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| 83 |
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| 84 | while (namespaces.hasNext()) {
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| 85 | METSNamespace namespaceData = (METSNamespace) namespaces.next();
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| 86 |
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| 87 | if (namespaceData.isEditable()){
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| 88 | return namespaceData;
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| 89 | }
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| 90 | }
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| 91 | return null;
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[6287] | 92 | }
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[8702] | 93 |
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| 94 | /**
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| 95 | * Add a piece of metadata to this document. Existing values are preserved.
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| 96 | *
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| 97 | * @param <code>String</code> the namespace in which the metadata occurs
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| 98 | * @param <code>String</code> the label of the metadata
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| 99 | * @param <code>String</code> the value of the metadata
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| 100 | */
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| 101 | public void addMetadata(String namespace, String label, String value)
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| 102 | {
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| 103 | METSNamespace namespaceData = this.getOpenNamespace(namespace);
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| 104 |
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| 105 | if (namespaceData == null ||
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| 106 | namespaceData.isEditable() == false) {
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| 107 | namespaceData = NamespaceFactory.initNamespace(namespace);
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| 108 | this.addNamespace(namespaceData);
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| 109 | }
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| 110 | namespaceData.addMetadata(label, value);
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[6287] | 111 | }
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[8702] | 112 |
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| 113 | /**
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| 114 | * Add a piece of metadata to this document. Existing values in editable
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| 115 | * parts of the document's metadata are destroyed.
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| 116 | *
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| 117 | * @param <code>String</code> the namespace in which the metadata occurs
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| 118 | * @param <code>String</code> the label of the metadata
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| 119 | * @param <code>String</code> the value of the metadata
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| 120 | */
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| 121 | public void setMetadata(String namespace, String label, String value)
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| 122 | {
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| 123 | METSNamespace namespaceData = this.getOpenNamespace(namespace);
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| 124 |
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| 125 | if (namespaceData == null ||
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| 126 | namespaceData.isEditable() == false) {
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| 127 | namespaceData = NamespaceFactory.initNamespace(namespace);
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| 128 | this.addNamespace(namespaceData);
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| 129 | }
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| 130 | namespaceData.setMetadata(label, value);
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[6287] | 131 | }
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[8702] | 132 |
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| 133 | /**
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| 134 | * Remove the metadata for a particular label.
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| 135 | *
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| 136 | * @param <code>String</code> the namespace in which the metadata occurs
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| 137 | * @param <code>String</code> the label of the metadata
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| 138 | */
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| 139 | public void removeMetadata(String namespace, String label)
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| 140 | {
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| 141 | METSNamespace namespaceData = this.getOpenNamespace(namespace);
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| 142 |
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| 143 | if (namespaceData != null && namespaceData.isEditable() == true) {
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| 144 | namespaceData.removeMetadata(label);
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| 145 | }
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[6287] | 146 | }
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[8702] | 147 |
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| 148 | /**
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| 149 | * Fetch a <code>List</code> of the values matching the given label in
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| 150 | * the requisite namespace.
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| 151 | *
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| 152 | * @param <code>String</code> namespace
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| 153 | * @param <code>String</code> label of metadata to match
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| 154 | *
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| 155 | * @return <code>List</code> the corresponding values found.
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| 156 | */
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| 157 | public List getMetadata(String namespace, String label)
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| 158 | {
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| 159 | // Simple case - no metadata
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| 160 | if (!this.map.containsKey(namespace)){
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| 161 | return null;
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| 162 | }
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| 163 |
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| 164 | // if there's just one instance of the requisite namespace,
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| 165 | // then again it is a simple case
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| 166 | if (this.map.getAll(namespace).size() == 1){
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| 167 | return this.getNamespace(namespace).getMetadata(label);
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| 168 | }
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| 169 |
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| 170 | // otherwise, step through and accumulate
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| 171 | List accumulatedValues = new ArrayList();
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| 172 | Iterator namespaceIterator = this.map.getAll(namespace).iterator();
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| 173 | while (namespaceIterator.hasNext()){
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| 174 | METSNamespace localNamespace = (METSNamespace) namespaceIterator.next();
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| 175 |
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| 176 | List localList = localNamespace.getMetadata(label);
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| 177 | if (localList != null && localList.size() > 0){
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| 178 | accumulatedValues.addAll(localList);
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| 179 | }
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| 180 | }
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| 181 |
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| 182 | // if the result of the accumulation is empty, return a null item
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| 183 | if (accumulatedValues.size() == 0){
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| 184 | return null;
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| 185 | }
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| 186 |
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| 187 | return accumulatedValues;
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| 188 | }
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| 189 |
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[8461] | 190 | protected void parse_xmlData(METSNamespace namespace, Element element)
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| 191 | {
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| 192 | if (namespace==null) {
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| 193 | System.err.println("namespace is null!!!!");
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| 194 | }
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| 195 | NodeList children = element.getChildNodes();
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| 196 |
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| 197 | for (int c = 0; c < children.getLength(); c++) {
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| 198 | if (children.item(c).getNodeType() != org.w3c.dom.Node.ELEMENT_NODE) {
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| 199 | continue;
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| 200 | }
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[8702] | 201 |
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[8461] | 202 | Element child = (Element) children.item(c);
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| 203 | String childName = child.getNodeName();
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| 204 |
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| 205 | // if (childName.equals("gsdl2:Metadata")) {
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| 206 | if (childName.equals("gsdl3:Metadata")) {
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| 207 | String metaName = child.getAttribute("name");
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| 208 | Text text = (Text) child.getFirstChild();
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| 209 | String metaValue = text.getData();
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| 210 |
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| 211 | addMetadata(namespace.getName(),metaName, metaValue);
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| 212 | }
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| 213 | }
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| 214 | }
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[8702] | 215 |
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[8461] | 216 | public void parse_mdWrap(Element element)
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| 217 | {
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| 218 | // deal with mets:mdWrap
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| 219 |
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| 220 | METSNamespace namespace = NamespaceFactory.parseXML(element);
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| 221 |
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| 222 | NodeList children = element.getChildNodes();
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| 223 |
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| 224 | for (int c = 0; c < children.getLength(); c ++) {
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| 225 | if (children.item(c).getNodeType() != org.w3c.dom.Node.ELEMENT_NODE) {
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| 226 | continue;
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| 227 | }
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[8702] | 228 |
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[8461] | 229 | Element child = (Element) children.item(c);
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| 230 | String childName = child.getNodeName();
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| 231 |
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| 232 | if (childName.equals("mets:xmlData")) {
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| 233 | parse_xmlData(namespace, child);
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| 234 | } else {
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| 235 | System.err.println("Warning: unrecognised tag " + childName
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| 236 | + "in mets:mdWrap");
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| 237 | }
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| 238 | }
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| 239 | }
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| 240 |
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| 241 | /**
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| 242 | * Parse an XML Element as a METS Descriptive Metadata section
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| 243 | *
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| 244 | * @param <code>Element</code> the XML element which represents the dmdSec itself
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| 245 | */
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| 246 | public static METSDescriptive parseXML(Element element)
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| 247 | {
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| 248 | // Note: no parsing of attributes required, we just move onto
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| 249 | // the metadata namespaces/sections themselves
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| 250 |
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| 251 | // deal with mets:dmdSec
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| 252 | String ID = element.getAttribute("ID");
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| 253 | String label = element.getAttribute("GROUPID");
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| 254 |
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| 255 | METSDescriptive thisDescriptive = new METSDescriptive(ID, label);
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| 256 |
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| 257 | //thisDescriptive = new METSDescriptive(ID, label);
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| 258 |
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| 259 | NodeList children = element.getChildNodes();
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| 260 |
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| 261 | for (int c = 0; c < children.getLength(); c ++) {
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| 262 | if (children.item(c).getNodeType() != org.w3c.dom.Node.ELEMENT_NODE) {
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| 263 | continue;
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| 264 | }
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| 265 |
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| 266 | Element child = (Element) children.item(c);
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| 267 | String childName = child.getNodeName();
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| 268 |
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| 269 | if (childName.equals("mets:mdRef")) {
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| 270 | //for External Descriptive Metadata
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| 271 | METSNamespace namespace = NamespaceFactory.parseXML(element);
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| 272 | System.err.println("*** mets::mdRef does not appear to be implemented yet");
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| 273 | } else if (childName.equals("mets:mdWrap")) {
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| 274 | thisDescriptive.parse_mdWrap(child);
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| 275 | } else {
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| 276 | // TODO: raise an error!
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| 277 | System.out.println("Error: METSDescriiptive: unrecognised tag "+childName);
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| 278 | }
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| 279 | }
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| 280 | return thisDescriptive;
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| 281 | }
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[8702] | 282 | /**
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| 283 | * Write the document metadata to a <code>PrintWriter</code> in METS
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| 284 | * XML format.
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| 285 | *
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| 286 | * @param <code>PrintWriter</code> the writer to use for output
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| 287 | */
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| 288 | public void write(PrintWriter output)
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| 289 | {
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| 290 | String tag = XMLTools.getOpenTag("mets", "dmdSec");
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| 291 | tag = XMLTools.addAttribute(tag, "ID", this.ID);
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| 292 | tag = XMLTools.addAttribute(tag, "GROUPID", this.name);
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| 293 | output.println(tag);
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[5800] | 294 |
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[8702] | 295 | Iterator keys = this.map.keySet().iterator();
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| 296 |
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| 297 | // get the keys one by one
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| 298 | while (keys.hasNext()){
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| 299 | Object nextKey = keys.next();
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| 300 | if (nextKey == null){
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| 301 | continue;
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| 302 | }
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| 303 | String key = nextKey.toString();
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| 304 |
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| 305 | // get every copy of the current namespace name - namespaces may
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| 306 | // occur more than once, so this is a List
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| 307 | Iterator namespaces = this.map.getAll(key).iterator();
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| 308 |
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| 309 | // namespaces will write themselves...
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| 310 | while (namespaces.hasNext()){
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| 311 | METSNamespace namespace = (METSNamespace) namespaces.next();
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[8708] | 312 |
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[8702] | 313 | namespace.write(output);
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| 314 | }
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| 315 | }
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| 316 |
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| 317 | tag = XMLTools.getCloseTag("mets", "dmdSec");
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| 318 | output.println(tag);
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[5800] | 319 | }
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[8702] | 320 |
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[8461] | 321 | public void copy_metadata(METSDescriptive dst)
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| 322 | {
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| 323 | Iterator keys = this.map.keySet().iterator();
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[8702] | 324 |
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[8461] | 325 | // get the keys one by one
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| 326 | while (keys.hasNext()) {
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| 327 | Object nextKey = keys.next();
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| 328 | if (nextKey == null) {
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| 329 | continue;
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| 330 | }
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| 331 | String key = nextKey.toString();
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| 332 |
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| 333 | // get every copy of the current namespace name - namespaces may
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| 334 | // occur more than once, so this is a List
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| 335 | Iterator namespaces = this.map.getAll(key).iterator();
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| 336 |
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| 337 | while (namespaces.hasNext()) {
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| 338 | METSNamespace namespace = (METSNamespace) namespaces.next();
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| 339 |
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| 340 | // for each metadata name
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| 341 |
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| 342 | Iterator mdnIter = namespace.getMetadataNames();
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| 343 | while (mdnIter.hasNext()) {
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| 344 |
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| 345 | String md_name = mdnIter.next().toString();
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| 346 |
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| 347 | List values = getMetadata(key, md_name);
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| 348 |
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| 349 | if (values != null) {
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| 350 | Iterator valueIter = values.iterator();
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| 351 | while (valueIter.hasNext()) {
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| 352 | String value = valueIter.next().toString();
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| 353 | dst.addMetadata("gsdl3",md_name,value);
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| 354 | }
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| 355 | }
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| 356 | }
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| 357 | }
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| 358 | }
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| 359 | }
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| 360 |
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| 361 |
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[8702] | 362 | public boolean writeSQL(DocumentInterface document, GS3SQLConnection connection)
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| 363 | {
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| 364 | // check if this node is in the
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| 365 | int sqlId = -1;
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[5945] | 366 |
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[8702] | 367 | // System.out.println("Writing " + connection.toString());
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| 368 |
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| 369 | GS3SQLSelect select = new GS3SQLSelect("metadata");
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| 370 | select.addField("*");
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| 371 | GS3SQLWhereItem whereItem = new GS3SQLWhereItem("MetaID", "=", this.ID);
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| 372 | GS3SQLWhereItem item = new GS3SQLWhereItem("DocID", "=", document.getID().toString());
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| 373 | GS3SQLWhere where = new GS3SQLWhere(whereItem);
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| 374 | where.add(item);
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| 375 | select.setWhere(where);
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| 376 |
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| 377 | connection.execute(select.toString());
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| 378 |
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| 379 | try {
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| 380 | GS3SQLAction action;
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[5800] | 381 |
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[8702] | 382 | ResultSet resultSet = connection.getResultSet();
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| 383 |
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| 384 | if (resultSet != null &&
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| 385 | resultSet.first()) {
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| 386 | // the node already exists - no need to do anything as such
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| 387 | GS3SQLUpdate update = new GS3SQLUpdate("metadata");
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| 388 | update.setWhere(where);
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| 389 | action = update;
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| 390 | }
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| 391 | else
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| 392 | { // Set result set to null, just in case next() didn't work above...
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| 393 | resultSet = null;
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| 394 |
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| 395 | // It is a new node and needs writing
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| 396 | action = new GS3SQLInsert("metadata");
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| 397 |
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| 398 | action.addValue("DocID", document.getID().toString());
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| 399 | action.addValue("MetaID", this.ID);
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| 400 | }
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| 401 |
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| 402 | // always set the group identifier
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| 403 | action.addValue("GroupID", this.name);
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| 404 |
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| 405 | // execute the action as required
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| 406 | connection.execute(action.toString());
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| 407 |
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| 408 | // create a new resultset if necessary
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| 409 | if (resultSet == null) {
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| 410 | // now execute the select statement again to get the new identifier
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| 411 | // 'MetadataRef'
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| 412 | // System.out.println(select.toString());
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| 413 | connection.execute(select.toString());
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| 414 |
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| 415 | resultSet = connection.getResultSet();
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| 416 | resultSet.first();
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| 417 | }
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| 418 |
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| 419 | // get the reference for this item...
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| 420 | sqlId = resultSet.getInt("MetadataRef");
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| 421 | }
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| 422 | catch (SQLException sql){
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| 423 | System.out.println(sql);
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| 424 | }
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| 425 |
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| 426 | Iterator keys = this.map.keySet().iterator();
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| 427 |
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| 428 | // get the keys one by one
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| 429 | while (keys.hasNext()){
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| 430 | Object nextKey = keys.next();
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| 431 | if (nextKey == null){
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| 432 | continue;
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| 433 | }
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| 434 | String key = nextKey.toString();
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| 435 |
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| 436 | // get every current namespace - namespaces may
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| 437 | // occur more than once, so this is a List
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| 438 | Iterator namespaces = this.map.getAll(key).iterator();
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| 439 |
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| 440 | // namespaces will write themselves...
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| 441 | while (namespaces.hasNext()){
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| 442 | METSNamespace namespace = (METSNamespace) namespaces.next();
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| 443 |
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| 444 | if (!namespace.writeSQL(sqlId, connection)){
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| 445 | return false;
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| 446 | }
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| 447 | }
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| 448 | }
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| 449 | return true;
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[5800] | 450 | }
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| 451 |
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[8702] | 452 | public static METSDescriptive readSQL(DocumentInterface document, GS3SQLConnection connection,
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| 453 | ResultSet resultSet)
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| 454 | {
|
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| 455 | try {
|
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| 456 | String ID = resultSet.getString("MetaID");
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| 457 | String name = resultSet.getString("GroupID");
|
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| 458 |
|
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| 459 | // create the metadata block object
|
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| 460 | METSDescriptive descriptive = new METSDescriptive(ID, name);
|
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| 461 |
|
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| 462 | // get its metadata reference to retrieve namespaces
|
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| 463 | int metadataRef = resultSet.getInt("MetadataRef");
|
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| 464 |
|
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| 465 | // query the database for matching namespaces for this metadata block
|
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| 466 | GS3SQLSelect select = new GS3SQLSelect("namespaces");
|
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| 467 | select.addField("*");
|
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| 468 | GS3SQLWhereItem whereItem = new GS3SQLWhereItem("MetadataRef", "=", Integer.toString(metadataRef),
|
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| 469 | GS3SQLField.INTEGER_TYPE);
|
---|
| 470 | GS3SQLWhere where = new GS3SQLWhere(whereItem);
|
---|
| 471 | select.setWhere(where);
|
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| 472 |
|
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| 473 | connection.execute(select.toString());
|
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| 474 |
|
---|
| 475 | // parse through the namespaces, calling the namespace class to create instances
|
---|
| 476 | // as it will
|
---|
| 477 | ResultSet namespaceSet = connection.getResultSet();
|
---|
| 478 | if (namespaceSet != null && namespaceSet.first()) {
|
---|
| 479 | do {
|
---|
| 480 | METSNamespace namespace = METSNamespace.readSQL(connection, namespaceSet);
|
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| 481 | if (namespace != null) {
|
---|
| 482 | descriptive.addNamespace(namespace);
|
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| 483 | }
|
---|
| 484 | else {
|
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| 485 | System.out.println("Null namespace output");
|
---|
| 486 | }
|
---|
| 487 | }
|
---|
| 488 | while (namespaceSet.next());
|
---|
| 489 | }
|
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| 490 |
|
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| 491 | return descriptive;
|
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[5945] | 492 | }
|
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[8702] | 493 | catch (SQLException sqlEx){
|
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| 494 | System.out.println(sqlEx);
|
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| 495 | System.exit(1);
|
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[5945] | 496 | }
|
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[8702] | 497 | return null;
|
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[5945] | 498 | }
|
---|
[5800] | 499 | }
|
---|