[12188] | 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 org.greenstone.gsdl3.gs3build.util.MultiMap;
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| 11 | import org.greenstone.gsdl3.gs3build.util.XMLTools;
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| 12 |
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| 13 | /**
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| 14 | * Implement a generic, ordered namespace in METS.
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| 15 | *
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| 16 | * @see: org.greenstone.gsdl3.gs3build.metadata.METSNamespace
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| 17 | */
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| 18 |
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| 19 | public class OrderedNamespace extends METSNamespace
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| 20 | {
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| 21 | List metadataList;
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| 22 |
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| 23 | public OrderedNamespace(String name)
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| 24 | {
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| 25 | super(name);
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| 26 | this.metadataList = new ArrayList();
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| 27 | }
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| 28 |
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| 29 | public OrderedNamespace(String name, METSLocation location)
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| 30 | {
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| 31 | super(name, location);
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| 32 | this.metadataList = new ArrayList();
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| 33 | }
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| 34 |
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| 35 | public boolean validate(String field, String value)
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| 36 | {
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| 37 | return true;
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| 38 | }
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| 39 |
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| 40 | /**
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| 41 | * Add a metadata item. Whether the field and value validate for this
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| 42 | * schema will also be tested.
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| 43 | *
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| 44 | * @param <code>String</code> the name of the field to be given the value
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| 45 | * @param <code>String</code> the value to be assigned
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| 46 | *
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| 47 | * @return <code>boolean</code> whether the field value was added. This
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| 48 | * would return <code>false</code> if the values did not validate,
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| 49 | * for example.
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| 50 | */
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| 51 | public boolean addMetadata(String label, String value)
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| 52 | {
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| 53 | if (!this.validate(label, value)) {
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| 54 | return false;
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| 55 | }
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| 56 |
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| 57 | this.metadataList.add(new NamespaceItem(label, value));
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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 | * Assign a metadata item. Whether the field and value validate for this
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| 63 | * schema will also be tested. Any existing metadata for that field will
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| 64 | * be destroyed if the new value validates.
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| 65 | *
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| 66 | * @param <code>String</code> the name of the field to be given the value
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| 67 | * @param <code>String</code> the value to be assigned
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| 68 | *
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| 69 | * @return <code>boolean</code> whether the field value was added. This
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| 70 | * would return <code>false</code> if the values did not validate,
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| 71 | * for example.
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| 72 | */
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| 73 | public boolean setMetadata(String label, String value)
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| 74 | {
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| 75 | if (!this.validate(label, value)){
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| 76 | return false;
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| 77 | }
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| 78 |
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| 79 | // TODO: this.metadataMap.setOnly(label, value);
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| 80 | int itemNo = this.findItem(label);
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| 81 | if (itemNo >= 0){
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| 82 | this.metadataList.set(itemNo, new NamespaceItem(label, value));
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| 83 | return true;
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| 84 | }
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| 85 | return false;
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| 86 | }
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| 87 |
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| 88 | /**
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| 89 | * Remove all metadata values for a given field name
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| 90 | *
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| 91 | * @param <code>String</code> the field to delete
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| 92 | *
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| 93 | * @return <code>boolean</code> whether the field was actually deleted;
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| 94 | * will return <code>true</code> if the field was already empty.
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| 95 | */
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| 96 | public boolean removeMetadata(String label)
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| 97 | {
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| 98 | int itemNo;
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| 99 |
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| 100 | itemNo = this.findItem(label);
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| 101 | while (itemNo >= 0){
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| 102 | this.metadataList.remove(itemNo);
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| 103 | itemNo = this.findItem(label);
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| 104 | }
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| 105 | return true;
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| 106 | }
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| 107 |
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| 108 | /**
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| 109 | * Remove a particular incidence of a given metadata field for a document.
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| 110 | * If an exact match for the given value is not found, nothing changes.
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| 111 | * N.B. if a value occurs twice, only the first incidence of it will be
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| 112 | * deleted from the list.
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| 113 | *
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| 114 | * @param <code>String</code> the field to have the value removed
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| 115 | * @param <code>String</code> the value to be removed from a given field
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| 116 | *
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| 117 | * @return <code>boolean</code> <code>true</code> if an actual metadata text
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| 118 | * is matched against the given value and is thus deleted.
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| 119 | */
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| 120 | public boolean removeMetadata(String label, String value)
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| 121 | {
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| 122 | int itemNo;
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| 123 |
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| 124 | itemNo = this.findItem(label);
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| 125 | if (itemNo >= 0) {
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| 126 | this.metadataList.remove(itemNo);
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| 127 | return true;
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| 128 | }
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| 129 | return false;
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| 130 | }
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| 131 |
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| 132 | /**
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| 133 | * Get the metadata items for a particular label
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| 134 | *
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| 135 | * @param <code>String</code> the label to fetch values for - must be devoid
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| 136 | * of namespace prologue (i.e. "title" rather than
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| 137 | * e.g. "dc:title").
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| 138 | *
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| 139 | * @return <code>List</code> the list of corresponding values. May be
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| 140 | * <code>null</code> if no values are found for the metadata
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| 141 | */
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| 142 | public List getMetadata(String label)
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| 143 | {
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| 144 | List resultList = new ArrayList();
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| 145 |
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| 146 | for (int i = 0; i < this.metadataList.size(); i ++) {
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| 147 | NamespaceItem item = (NamespaceItem) this.metadataList.get(i);
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| 148 |
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| 149 | if (item.getLabel().equals(label)){
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| 150 | resultList.add(item.getValue());
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| 151 | }
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| 152 | }
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| 153 | if (resultList.size() > 0){
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| 154 | return resultList;
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| 155 | }
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| 156 | return null;
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| 157 | }
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| 158 |
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| 159 | private int findItem(String label)
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| 160 | {
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| 161 | for (int i = 0; i < this.metadataList.size(); i ++) {
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| 162 | if (((NamespaceItem) this.metadataList.get(i)).getLabel().equals(label)){
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| 163 | return i;
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| 164 | }
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| 165 | }
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| 166 | return -1;
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| 167 | }
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| 168 |
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| 169 | private int findItem(String label, String value)
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| 170 | {
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| 171 | for (int i = 0; i < this.metadataList.size(); i ++){
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| 172 | NamespaceItem item = (NamespaceItem) this.metadataList.get(i);
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| 173 | if (item.getLabel().equals(label) && item.getValue().equals(value)){
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| 174 | return i;
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| 175 | }
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| 176 | }
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| 177 | return -1;
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| 178 | }
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| 179 |
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| 180 | public Iterator getMetadataNames()
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| 181 | {
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| 182 | return this.metadataList.iterator();
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| 183 | }
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| 184 |
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| 185 |
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| 186 | /**
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| 187 | * Write out the metadata to an XML file through a <code>PrintWriter</code>.
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| 188 | *
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| 189 | * @param <code>PrintWriter</code> the writer to use.
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| 190 | */
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| 191 | public boolean write(PrintWriter writer)
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| 192 | {
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| 193 | // if this is a non-file block of metadata, write it out in long hand
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| 194 | if (this.location == null){
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| 195 | String tag = XMLTools.getOpenTag("mets", "mdWrap");
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| 196 | tag = XMLTools.addAttribute(tag, "MDTYPE", "OTHER");
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| 197 | tag = XMLTools.addAttribute(tag, "OTHERMDTYPE", this.name);
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| 198 | if (this.id != null) {
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| 199 | this.id = "gsdl"+this.id;
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| 200 | tag = XMLTools.addAttribute(tag, "ID", this.id);
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| 201 | }
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| 202 | writer.print(" "); //indentation
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| 203 | writer.println(tag);
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| 204 |
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| 205 | Iterator items = this.metadataList.iterator();
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| 206 |
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| 207 | while (items.hasNext()){
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| 208 | NamespaceItem item = (NamespaceItem) items.next();
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| 209 | this.writeItem(writer, item);
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| 210 | }
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| 211 | writer.print(" "); //indentation
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| 212 | writer.println("</mets:mdWrap>");
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| 213 | }
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| 214 | // otherwise, drop the metadata out in a simplified file-reference
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| 215 | // form only
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| 216 | else
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| 217 | {
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| 218 | String tag = XMLTools.getOpenTag("mets", "mdRef");
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| 219 | tag = XMLTools.addAttribute(tag, "LOCTYPE", this.location.getType());
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| 220 | tag = XMLTools.addAttribute(tag, "xlink:href", this.location.getLocation().toString());
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| 221 | tag = XMLTools.addAttribute(tag, "MDTYPE", this.name);
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| 222 | //tag = XMLTools.addAttribute (tag, "MDTYPE", "OTHER");
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| 223 | //tag = XMLTools.addAttribute(tag, "OTHERMDTYPE", this.name);
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| 224 | if (this.id != null) {
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| 225 | tag = XMLTools.addAttribute(tag, "ID", this.id);
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| 226 | }
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| 227 | tag = XMLTools.makeSingleton(tag);
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| 228 | }
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| 229 | return true;
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| 230 | }
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| 231 |
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| 232 | /**
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| 233 | * Write out a single element - this may be overloaded to provide for the
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| 234 | * appropriate formatting for this metadata.
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| 235 | */
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| 236 | protected boolean writeItem(PrintWriter writer, NamespaceItem item)
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| 237 | {
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| 238 | // Do some default sillinesses
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| 239 | //writer.write(" ");
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| 240 | writer.write(XMLTools.getOpenTag(this.name, item.getLabel()));
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| 241 |
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| 242 | writer.write(item.getValue());
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| 243 |
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| 244 | writer.write(XMLTools.getCloseTag(this.name, item.getLabel()));
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| 245 | return true;
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| 246 | }
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| 247 |
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| 248 | /**
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| 249 | * <p>Indicate whether this metadata is open to being changed or not.</p>
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| 250 | * <p>Metadata which is created from a distinct file cannot be changed,
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| 251 | * only those which have no associated file can be modified.
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| 252 | *
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| 253 | * @return <code>boolean</code> whether this namespace can be altered.
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| 254 | */
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| 255 | public boolean isEditable()
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| 256 | {
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| 257 | return (this.location == null);
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| 258 | }
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| 259 | }
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