/*

 * Copyright 2008 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.jmx.namespace;

import com.sun.jmx.defaults.JmxProperties;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.management.MBeanServerConnection;

import javax.management.namespace.JMXNamespaces;

/**

 * A RoutingConnectionProxy is an MBeanServerConnection proxy that proxies a

 * source name space in a source MBeanServerConnection.

 * It wraps a source MBeanServerConnection, and rewrites routing

 * ObjectNames. It is used to implement

 * {@code JMXNamespaces.narrowToNamespace(MBeanServerConnection)}.

 * <p><b>

 * This API is a Sun internal API and is subject to changes without notice.

 * </b></p>

 * @since 1.7

 */

public class RoutingConnectionProxy

        extends RoutingProxy<MBeanServerConnection> {

    /**

     * A logger for this class.

     **/

    private static final Logger LOG = JmxProperties.NAMESPACE_LOGGER;

    /**

     * Creates a new instance of RoutingConnectionProxy

     */

    public RoutingConnectionProxy(MBeanServerConnection source,

                               String sourceDir) {

        this(source,sourceDir,"",false);

    }

    /**

     * Creates a new instance of RoutingConnectionProxy

     */

    public RoutingConnectionProxy(MBeanServerConnection source,

                               String sourceDir,

                               String targetDir,

                               boolean forwardsContext) {

        super(source,sourceDir,targetDir,forwardsContext);

        if (LOG.isLoggable(Level.FINER))

            LOG.finer("RoutingConnectionProxy for " + getSourceNamespace() +

                      " created");

    }

    @Override

    public String toString() {

        final String targetNs = getTargetNamespace();

        final String sourceNs = getSourceNamespace();

        String wrapped = String.valueOf(source());

        if ("".equals(targetNs)) {

            if (forwardsContext)

                wrapped = "ClientContext.withDynamicContext("+wrapped+")";

            return "JMXNamespaces.narrowToNamespace("+

                    wrapped+", \""+

                    sourceNs+"\")";

        }

        return this.getClass().getSimpleName()+"("+wrapped+", \""+

               sourceNs+"\", \""+

               targetNs+"\", "+forwardsContext+")";

    }

    public static MBeanServerConnection cd(MBeanServerConnection source,

            String sourcePath) {

        if (source == null) throw new IllegalArgumentException("null");

        if (source.getClass().equals(RoutingConnectionProxy.class)) {

            // cast is OK here, but findbugs complains unless we use class.cast

            final RoutingConnectionProxy other =

                    RoutingConnectionProxy.class.cast(source);

            final String target = other.getTargetNamespace();

            // Avoid multiple layers of serialization.

            //

            // We construct a new proxy from the original source instead of

            // stacking a new proxy on top of the old one.

            // - that is we replace

            //      cd ( cd ( x, dir1), dir2);

            // by

            //      cd (x, dir1//dir2);

            //

            // We can do this only when the source class is exactly

            //    NamespaceConnectionProxy.

            //

            if (target == null || target.equals("")) {

                final String path =

                    JMXNamespaces.concat(other.getSourceNamespace(),

                    sourcePath);

                return new RoutingConnectionProxy(other.source(),path,"",

                        other.forwardsContext);

            }

            // Note: we could do possibly something here - but it would involve

            //       removing part of targetDir, and possibly adding

            //       something to sourcePath.

            //       Too complex to bother! => simply default to stacking...

        }

        return new RoutingConnectionProxy(source,sourcePath);

    }

}