/*
* Copyright 2007-2009 Sun Microsystems, Inc.
*
* This file is part of Project Darkstar Server.
*
* Project Darkstar Server is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation and
* distributed hereunder to you.
*
* Project Darkstar Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sun.sgs.impl.service.data;
import com.sun.sgs.app.ManagedObject;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
/**
* Provides information about the data stored by the data service.
*
* The serialVersionUID represents the major version number, which must match
* the value in the current version of the implementation.
*
* The minorVersion represents the minor version number, which can vary between
* a stored instance and the implementation.
*
* Version history:
*
* Version 1.0: Initial version, 11/3/2006
*/
final class DataServiceHeader implements ManagedObject, Serializable {
/** The version of the serialized form. */
private static final long serialVersionUID = 1;
/**
* The minor version number.
*
* @serial
*/
final int minorVersion = 0;
/**
* The name of the application that initially created the data service.
*
* @serial
*/
final String appName;
/**
* Creates an instance of this class with the specified application
* name.
*/
DataServiceHeader(String appName) {
this.appName = appName;
validate();
}
/** Validates the fields of this instance. */
private void validate() {
if (minorVersion < 0) {
throw new IllegalArgumentException(
"The minorVersion field must not be negative");
}
if (appName == null) {
throw new NullPointerException(
"The appName field must not be null");
}
}
/** Returns a string representation of this instance. */
public String toString() {
return "DataServiceHeader[" +
"version:" + serialVersionUID + "." + minorVersion +
", appName:\"" + appName + "\"]";
}
/** Validates the fields of this instance. */
private void readObject(ObjectInputStream in)
throws ClassNotFoundException, IOException
{
in.defaultReadObject();
try {
validate();
} catch (RuntimeException e) {
throw (IOException)
new InvalidObjectException(e.getMessage()).initCause(e);
}
}
}