masteruserstore.java

OpenJMS是一个开源的Java Message Service API 1.0.2 规范的实现,它包含有以下特性： *. 它既支持点到点（point-to-point）（PTP）模型和发布/订

/**
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 *
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 *    copy of this document.
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 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Exoffice Technologies.  For written permission,
 *    please contact [e-mail].
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 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
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 * 5. Due credit should be given to the Exolab Project
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 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *
 * Copyright 2005 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: MasterUserStore.java,v 1.1 2005/10/20 14:07:03 tanderson Exp $
 */
package org.exolab.jms.tools.migration.master;

import java.sql.Connection;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import javax.jms.JMSException;

import org.exolab.jms.authentication.User;
import org.exolab.jms.persistence.DatabaseService;
import org.exolab.jms.persistence.PersistenceException;
import org.exolab.jms.tools.migration.IteratorAdapter;
import org.exolab.jms.tools.migration.Store;
import org.exolab.jms.tools.migration.StoreIterator;


/**
 * <code>MasterMessageStore</code> manages a collection of persistent users.
 *
 * @author <a href="mailto:[e-mail]">Tim Anderson</a>
 * @version $Revision: 1.1 $ $Date: 2005/10/20 14:07:03 $
 */
public class MasterUserStore implements Store {

    /**
     * The database service.
     */
    private DatabaseService _database;


    /**
     * Construct a new <code>MasterUserStore</code>.
     *
     * @param database the database service
     */
    public MasterUserStore(DatabaseService database) {
        _database = database;
    }

    /**
     * Export the users.
     *
     * @return an iterator over the collection
     * @throws JMSException         for any JMS error
     * @throws PersistenceException for any persistence error
     */
    public StoreIterator exportCollection() throws JMSException,
            PersistenceException {
        List users = getUsers();
        return new IteratorAdapter(users.iterator());
    }

    /**
     * Import users into the store.
     *
     * @param iterator an iterator over the collection
     * @throws JMSException         for any JMS error
     * @throws PersistenceException for any persistence error
     */
    public void importCollection(StoreIterator iterator) throws JMSException,
            PersistenceException {
        Connection connection = _database.getConnection();
        while (iterator.hasNext()) {
            User user = (User) iterator.next();
            _database.getAdapter().addUser(connection, user);
        }
        _database.commit();
    }

    /**
     * Returns the number of elements in the collection.
     *
     * @return the number of elements in the collection
     * @throws PersistenceException for any persistence error
     */
    public int size() throws PersistenceException {
        return getUsers().size();
    }

    /**
     * Returns the users.
     *
     * @return a list of {@link User} instances
     * @throws PersistenceException for any persistence error
     */
    private List getUsers() throws PersistenceException {
        List result = new ArrayList();
        Enumeration users;
        Connection connection = _database.getConnection();
        users = _database.getAdapter().getAllUsers(connection);
        while (users.hasMoreElements()) {
            result.add(users.nextElement());
        }
        _database.commit();
        return result;
    }
}