protected void initializeWithTableNames(Session session, Collection tableNames) {
tableNameToClass = new Hashtable(tableNames.size());
tableNameToPkFieldNames = new Hashtable(tableNames.size());
// pkFieldVectors cached here to avoid calculating it more than once per class
Hashtable classToPkFieldNames = new Hashtable();
// loop through the descriptors to fill out tableNameToClass and tableNameToPkFieldNames
Iterator descriptors = session.getDescriptors().values().iterator();
while (descriptors.hasNext() && !tableNames.isEmpty()) {
ClassDescriptor desc = (ClassDescriptor) descriptors.next();
// Create a Vector containing names of all tables mapped to the descriptor
Vector descTableNames = desc.getTableNames();
// bypass descriptors with no tables
if (descTableNames.isEmpty()) {
continue;
}
// Remove schema names (if any) converting "SCHEMA_NAME.TABLE_NAME" to "TABLE_NAME"
removePrefixFromDatabaseObjectNames(descTableNames);
// handle inheritance: table name should be mapped to the base mapped class
Class baseClass = desc.getJavaClass();
while (desc.isChildDescriptor()) {
desc = session.getDescriptor(desc.getInheritancePolicy().getParentClass());
baseClass = desc.getJavaClass();
}
Iterator it = tableNames.iterator();
while (it.hasNext()) {
// for each tableName specified by the user
String tableName = (String) it.next();
// verify whether the descriptor maps a table with the same name
if (descTableNames.contains(tableName)) {
// map the table name to the baseClass corresponding to the descriptor
tableNameToClass.put(tableName, baseClass);
// try to obtain cached pkFieldNames Vector corresponding to baseClass
Vector pkFieldNames = (Vector) classToPkFieldNames.get(baseClass);
if (pkFieldNames == null) {
// Create a Vector containing names of all primary key fields
pkFieldNames = desc.getPrimaryKeyFieldNames();
// Remove table name converting from "TABLE_NAME.FIELD_NAME" to "FIELD_NAME"
removePrefixFromDatabaseObjectNames(pkFieldNames);
// cache pkFieldNames Vector corresponding to baseClass
classToPkFieldNames.put(baseClass, pkFieldNames);
}
// map the table name to the Vector of names of primary key fields.
tableNameToPkFieldNames.put(tableName, pkFieldNames);
// the table name is mapped - remove it from the list of table names to be mapped.
it.remove();
}
}
}
}
public CacheInvalidator(Session session) {
// HashSet is used to avoid duplications
HashSet tableNames = new HashSet();
// fill out tableNames collection with all tables' names mapped by all descriptors
Iterator descriptors = session.getDescriptors().values().iterator();
while (descriptors.hasNext()) {
ClassDescriptor desc = (ClassDescriptor) descriptors.next();
// Create a Vector containing names of all tables mapped to the descriptor
Vector descTableNames = desc.getTableNames();
// Remove schema names (if any) converting "SCHEMA_NAME.TABLE_NAME" to "TABLE_NAME"
removePrefixFromDatabaseObjectNames(descTableNames);
// add descTableNames to the collection
tableNames.addAll(descTableNames);
}
// initialize
initializeWithTableNames(session, tableNames);
}
