package org.apache.torque.oid;/* * Copyright 2001-2004 The Apache Software Foundation. * * 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. */import org.apache.torque.adapter.DB;import org.apache.torque.adapter.IDMethod;/** * A factory which instantiates {@link * org.apache.torque.oid.IdGenerator} implementations. * * @author <a href="mailto:dlr@collab.net">Daniel Rall</a> * @version $Id: IDGeneratorFactory.java,v 1.4 2005/01/31 19:43:53 tfischer Exp $ */public class IDGeneratorFactory{    /**     * The list of ID generation method types which have associated     * {@link org.apache.torque.oid.IdGenerator} implementations.     */    public static final String[] ID_GENERATOR_METHODS =    {        IDMethod.NATIVE, IDMethod.AUTO_INCREMENT, IDMethod.SEQUENCE    };    /**     * Factory method which instantiates {@link     * org.apache.torque.oid.IdGenerator} implementations based on the     * return value of the provided adapter's {@link     * org.apache.torque.adapter.DB#getIDMethodType()} method.     * Returns <code>null</code> for unknown types.     *     * @param dbAdapter The type of adapter to create an ID generator for.     * @return The appropriate ID generator (possibly <code>null</code>).     */    public static IdGenerator create(DB dbAdapter, String name)    {        String idMethod = dbAdapter.getIDMethodType();        if (IDMethod.AUTO_INCREMENT.equals(idMethod))        {            return new AutoIncrementIdGenerator(dbAdapter, name);        }        else if (IDMethod.SEQUENCE.equals(idMethod))        {            return new SequenceIdGenerator(dbAdapter, name);        }        else        {            return null;        }    }}