/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.ant.jmx;

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;

import org.apache.tools.ant.BuildException;

/**
 * unregister a MBean at <em>JMX</em> JSR 160 MBeans Server. 
 * <ul>
 * <li>unregister Mbeans</li>
 * </ul>
 * <p>
 * Examples:
 * <br/>
 * unregister an existing Mbean at jmx.server connection 
 * <pre>
 *   &lt;jmx:unregister
 *           ref="jmx.server"
 *           name="Catalina:type=MBeanFactory" /&gt;
 * </pre>
 * </p>
 * <p>
 * <b>WARNING</b>Not all Tomcat MBeans can successfully unregister remotely. The mbean
 * unregistration don't remove valves, realm, .. from parent class.
 * Please, use the MBeanFactory operation to remove valves and realms.
 * </p>
 * <p>
 * First call to a remote MBeanserver save the JMXConnection a reference <em>jmx.server</em>
 * </p>
 * These tasks require Ant 1.6 or later interface.
 *
 * @author Peter Rossbach
 * @version $Revision$
 * @since 5.5.12
 */
public class JMXAccessorUnregisterTask extends JMXAccessorTask {

    // ----------------------------------------------------- Instance Info

    /**
     * Descriptive information describing this implementation.
     */
    private static final String info = "org.apache.catalina.ant.JMXAccessorUnregisterTask/1.0";

    /**
     * Return descriptive information about this implementation and the
     * corresponding version number, in the format
     * <code>&lt;description&gt;/&lt;version&gt;</code>.
     * @return Returns the class info.
     */
    public String getInfo() {

        return (info);

    }
    // ------------------------------------------------------ protected Methods
    
    /**
     * Execute the specified command, based on the configured properties. The
     * input stream will be closed upon completion of this task, whether it was
     * executed successfully or not.
     * 
     * @exception Exception
     *                if an error occurs
     */
    public String jmxExecute(MBeanServerConnection jmxServerConnection)
        throws Exception {

        if (getName() == null) {
            throw new BuildException("Must specify a 'name'");
        }
        return  jmxUuregister(jmxServerConnection, getName());
     }


    /**
     * Unregister Mbean
     * @param jmxServerConnection
     * @param name
     * @return The value of the given named attribute
     * @throws Exception
     */
    protected String jmxUuregister(MBeanServerConnection jmxServerConnection,String name) throws Exception {
        String error = null;
        if(isEcho()) {
            handleOutput("Unregister MBean " + name  );
        }
        jmxServerConnection.unregisterMBean(
                new ObjectName(name));
        return error;
    }

}