/**
* Perform a database query to obtain the string array of values corresponding to the passed
* parameters. This is only really called from <code>
* getMetadata(schema, element, qualifier, lang);
* </code> which will obtain the value from cache if available first.
*
* @param schema
* @param element
* @param qualifier
* @param lang
*/
@Override
public List<DCValue> getMetadata(
Item item, String schema, String element, String qualifier, String lang) {
List<DCValue> metadata = new ArrayList<DCValue>();
try {
TableRowIterator tri;
if (qualifier == null) {
Object[] params = {item.getID(), element, schema};
tri = DatabaseManager.query(context, getByMetadataElement, params);
} else if (Item.ANY.equals(qualifier)) {
Object[] params = {item.getID(), element, schema};
tri = DatabaseManager.query(context, getByMetadataAnyQualifier, params);
} else {
Object[] params = {item.getID(), element, qualifier, schema};
tri = DatabaseManager.query(context, getByMetadata, params);
}
while (tri.hasNext()) {
TableRow tr = tri.next();
DCValue dcv = new DCValue();
dcv.schema = schema;
dcv.element = element;
dcv.qualifier = qualifier;
dcv.language = lang;
dcv.value = tr.getStringColumn("text_value");
metadata.add(dcv);
}
} catch (SQLException sqle) {
throw new RuntimeException(sqle);
}
return metadata;
}
private List<List<MetadataField>> getMetadataFieldsList(
org.dspace.core.Context context, List<String> query_field) throws SQLException {
List<List<MetadataField>> listFieldList = new ArrayList<List<MetadataField>>();
for (String s : query_field) {
ArrayList<MetadataField> fields = new ArrayList<MetadataField>();
listFieldList.add(fields);
if (s.equals("*")) {
continue;
}
String schema = "";
String element = "";
String qualifier = null;
String[] parts = s.split("\\.");
if (parts.length > 0) {
schema = parts[0];
}
if (parts.length > 1) {
element = parts[1];
}
if (parts.length > 2) {
qualifier = parts[2];
}
if (Item.ANY.equals(qualifier)) {
for (MetadataField mf :
metadataFieldService.findFieldsByElementNameUnqualified(context, schema, element)) {
fields.add(mf);
}
} else {
MetadataField mf = metadataFieldService.findByElement(context, schema, element, qualifier);
if (mf != null) {
fields.add(mf);
}
}
}
return listFieldList;
}