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/*
* Copyright 2004-2011 H2 Group.
* Copyright 2011 James Moger.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.iciql;
import com.iciql.Iciql.IQVersion;
/**
* Interface which defines a class to handle table changes based on model
* versions. An implementation of <i>DbUpgrader</i> must be annotated with the
* <i>IQDatabase</i> annotation, which defines the expected database version
* number.
*/
public interface DbUpgrader {
/**
* Defines method interface to handle database upgrades. This method is only
* called if your <i>DbUpgrader</i> implementation is annotated with
* IQDatabase.
*
* @param db
* the database
* @param fromVersion
* the old version
* @param toVersion
* the new version
* @return true for successful upgrade. If the upgrade is successful, the
* version registry is automatically updated.
*/
boolean upgradeDatabase(Db db, int fromVersion, int toVersion);
/**
* Defines method interface to handle table upgrades.
*
* @param db
* the database
* @param schema
* the schema
* @param table
* the table
* @param fromVersion
* the old version
* @param toVersion
* the new version
* @return true for successful upgrade. If the upgrade is successful, the
* version registry is automatically updated.
*/
boolean upgradeTable(Db db, String schema, String table, int fromVersion, int toVersion);
/**
* The default database upgrader. It throws runtime exception instead of
* handling upgrade requests.
*/
@IQVersion(0)
public static class DefaultDbUpgrader implements DbUpgrader {
public boolean upgradeDatabase(Db db, int fromVersion, int toVersion) {
throw new IciqlException("Please provide your own DbUpgrader implementation.");
}
public boolean upgradeTable(Db db, String schema, String table, int fromVersion, int toVersion) {
throw new IciqlException("Please provide your own DbUpgrader implementation.");
}
}
}
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