/*
* Copyright 2004-2023 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.schema;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import org.h2.engine.Database;
import org.h2.engine.SessionLocal;
import org.h2.engine.User;
import org.h2.table.Table;
/**
* Meta data schema.
*/
public abstract class MetaSchema extends Schema {
/**
* Creates a new instance of meta data schema.
*
* @param database
* the database
* @param id
* the object id
* @param schemaName
* the schema name
* @param owner
* the owner of the schema
*/
public MetaSchema(Database database, int id, String schemaName, User owner) {
super(database, id, schemaName, owner, true);
}
@Override
public Table findTableOrView(SessionLocal session, String name) {
Map<String, Table> map = getMap(session);
Table table = map.get(name);
if (table != null) {
return table;
}
return super.findTableOrView(session, name);
}
@Override
public Collection<Table> getAllTablesAndViews(SessionLocal session) {
Collection<Table> userTables = super.getAllTablesAndViews(session);
if (session == null) {
return userTables;
}
Collection<Table> systemTables = getMap(session).values();
if (userTables.isEmpty()) {
return systemTables;
}
ArrayList<Table> list = new ArrayList<>(systemTables.size() + userTables.size());
list.addAll(systemTables);
list.addAll(userTables);
return list;
}
@Override
public Table getTableOrView(SessionLocal session, String name) {
Map<String, Table> map = getMap(session);
Table table = map.get(name);
if (table != null) {
return table;
}
return super.getTableOrView(session, name);
}
@Override
public Table getTableOrViewByName(SessionLocal session, String name) {
Map<String, Table> map = getMap(session);
Table table = map.get(name);
if (table != null) {
return table;
}
return super.getTableOrViewByName(session, name);
}
/**
* Returns map of tables in this schema.
*
* @param session the session
* @return map of tables in this schema
*/
protected abstract Map<String, Table> getMap(SessionLocal session);
@Override
public boolean isEmpty() {
return false;
}
}