/**
* 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;
}
@Override
public void loadMetadata(Item item) {
MetadataFieldDAO mfDAO = MetadataFieldDAOFactory.getInstance(context);
MetadataSchemaDAO msDAO = MetadataSchemaDAOFactory.getInstance(context);
try {
TableRowIterator tri =
DatabaseManager.queryTable(
context,
"metadatavalue",
"SELECT * FROM MetadataValue "
+ "WHERE item_id = ? "
+ "ORDER BY metadata_field_id, place",
item.getID());
List<DCValue> metadata = new ArrayList<DCValue>();
for (TableRow row : tri.toList()) {
// Get the associated metadata field and schema information
int fieldID = row.getIntColumn("metadata_field_id");
MetadataField field = mfDAO.retrieve(fieldID);
if (field == null) {
log.error("Loading item - cannot find metadata field " + fieldID);
} else {
MetadataSchema schema = msDAO.retrieve(field.getSchemaID());
// Make a DCValue object
DCValue dcv = new DCValue();
dcv.schema = schema.getName();
dcv.element = field.getElement();
dcv.qualifier = field.getQualifier();
dcv.language = row.getStringColumn("text_lang");
dcv.value = row.getStringColumn("text_value");
// Add it to the item
metadata.add(dcv);
}
}
item.setMetadata(metadata);
} catch (SQLException sqle) {
throw new RuntimeException(sqle);
}
}