/*
 * Copyright (c) 2012, 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.messaging.jmq.jmsserver.persist.file;

import java.io.IOException;
import com.sun.messaging.jmq.jmsserver.data.BaseTransaction;
import com.sun.messaging.jmq.jmsserver.util.BrokerException;

public abstract class TransactionEvent {

    static public TransactionEvent createFromBytes(byte[] data) throws IOException, BrokerException {

        TransactionEvent result = null;
        byte type = data[0];
        byte subType = data[1];
        result = create(type, subType);
        result.readFromBytes(data);
        return result;
    }

    static TransactionEvent create(byte type, byte subtype) {
        TransactionEvent result = null;
        switch (type) {
        case BaseTransaction.LOCAL_TRANSACTION_TYPE:
            result = LocalTransactionEvent.create(subtype);
            break;
        case BaseTransaction.CLUSTER_TRANSACTION_TYPE:
            result = ClusterTransactionEvent.create(subtype);
            break;
        case BaseTransaction.REMOTE_TRANSACTION_TYPE:
            result = RemoteTransactionEvent.create(subtype);
            break;
        case BaseTransaction.NON_TRANSACTED_MSG_TYPE:
            result = NonTransactedMsgEvent.create(subtype);
            break;
        case BaseTransaction.NON_TRANSACTED_ACK_TYPE:
            result = NonTransactedMsgAckEvent.create(subtype);
            break;
        case BaseTransaction.MSG_REMOVAL_TYPE:
            result = MsgRemovalEvent.create(subtype);
            break;

        default:
            throw new UnsupportedOperationException();
        }
        return result;
    }

    abstract int getType();

    abstract void readFromBytes(byte[] data) throws IOException, BrokerException;

    abstract byte[] writeToBytes() throws IOException, BrokerException;

}
