abstractnamingenumeration.java

实现了Jms的服务器源码,支持多种适配器,DB,FTP,支持多种数据库

/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software License
 * version 1.1, a copy of which has been included with this distribution in
 * the LICENSE file.
 */
package org.apache.avalon.excalibur.naming;

import java.util.Hashtable;
import java.util.Iterator;
import java.util.NoSuchElementException;
import javax.naming.Binding;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NameClassPair;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.spi.NamingManager;

/**
 * Class for building NamingEnumerations.
 *
 * @author <a href="mailto:[e-mail]">Peter Donald</a>
 * @version $Revision: 1.2 $
 */
public abstract class AbstractNamingEnumeration
    implements NamingEnumeration
{
    protected Context      m_owner;
    protected Namespace    m_namespace;

    public AbstractNamingEnumeration( final Context owner, final Namespace namespace )
    {
        m_owner = owner;
        m_namespace = namespace;
    }

    public boolean hasMore()
        throws NamingException
    {
        return hasMoreElements();
    }

    public Object nextElement()
    {
        try { return next(); }
        catch( final NamingException ne )
        {
            throw new NoSuchElementException( ne.toString() );
        }
    }

    protected Object resolve( final String name, final Object object )
        throws NamingException
    {
        // Call getObjectInstance for using any object factories
        try
        {
            final Name atom = m_owner.getNameParser( name ).parse( name );
            return m_namespace.
                getObjectInstance( object, atom, m_owner, m_owner.getEnvironment() );
        }
        catch( final Exception e )
        {
            final NamingException ne = new NamingException( "getObjectInstance failed" );
            ne.setRootCause( e );
            throw ne;
        }
    }

    public void close()
    {
        m_namespace = null;
        m_owner = null;
    }
}