/**
* Serialize the schema registry. If the parameter 'schema' is null or empty, save all schemas
*
* @param context DSpace Context
* @param xmlSerializer XML serializer
* @param schema schema (may be null to save all)
* @throws SQLException if database error
* @throws SAXException if XML error
* @throws RegistryExportException if export error
*/
public static void saveSchema(Context context, XMLSerializer xmlSerializer, String schema)
throws SQLException, SAXException, RegistryExportException {
if (schema != null && !"".equals(schema)) {
// Find a single named schema
MetadataSchema mdSchema = metadataSchemaService.find(context, schema);
saveSchema(xmlSerializer, mdSchema);
} else {
// Find all schemas
List<MetadataSchema> mdSchemas = metadataSchemaService.findAll(context);
for (MetadataSchema mdSchema : mdSchemas) {
saveSchema(xmlSerializer, mdSchema);
}
}
}
/**
* Save a registry to a filepath
*
* @param file filepath
* @param schema schema definition to save
* @throws SQLException if database error
* @throws IOException if IO error
* @throws SAXException if XML error
* @throws RegistryExportException if export error
*/
public static void saveRegistry(String file, String schema)
throws SQLException, IOException, SAXException, RegistryExportException {
// create a context
Context context = new Context();
context.setIgnoreAuthorization(true);
OutputFormat xmlFormat = new OutputFormat(Method.XML, "UTF-8", true);
xmlFormat.setLineWidth(120);
xmlFormat.setIndent(4);
XMLSerializer xmlSerializer =
new XMLSerializer(new BufferedWriter(new FileWriter(file)), xmlFormat);
// XMLSerializer xmlSerializer = new XMLSerializer(System.out, xmlFormat);
xmlSerializer.startDocument();
xmlSerializer.startElement("dspace-dc-types", null);
// Save the schema definition(s)
saveSchema(context, xmlSerializer, schema);
List<MetadataField> mdFields = null;
// If a single schema has been specified
if (schema != null && !"".equals(schema)) {
// Get the id of that schema
MetadataSchema mdSchema = metadataSchemaService.find(context, schema);
if (mdSchema == null) {
throw new RegistryExportException("no schema to export");
}
// Get the metadata fields only for the specified schema
mdFields = metadataFieldService.findAllInSchema(context, mdSchema);
} else {
// Get the metadata fields for all the schemas
mdFields = metadataFieldService.findAll(context);
}
// Output the metadata fields
for (MetadataField mdField : mdFields) {
saveType(context, xmlSerializer, mdField);
}
xmlSerializer.endElement("dspace-dc-types");
xmlSerializer.endDocument();
// abort the context, as we shouldn't have changed it!!
context.abort();
}
/**
* Helper method to retrieve a schema name for the field. Caches the name after looking up the id.
*
* @param context DSpace Context
* @param mdField DSpace metadata field
* @return name of schema
* @throws SQLException if database error
* @throws RegistryExportException if export error
*/
private static String getSchemaName(Context context, MetadataField mdField)
throws SQLException, RegistryExportException {
// Get name from cache
String name = schemaMap.get(mdField.getMetadataSchema().getSchemaID());
if (name == null) {
// Name not retrieved before, so get the schema now
MetadataSchema mdSchema =
metadataSchemaService.find(context, mdField.getMetadataSchema().getSchemaID());
if (mdSchema != null) {
name = mdSchema.getName();
schemaMap.put(mdSchema.getSchemaID(), name);
} else {
// Can't find the schema
throw new RegistryExportException("Can't get schema name for field");
}
}
return name;
}