container/catalina/src/share/org/apache/catalina/mbeans/ContextEnvironmentMBean.java

/*
 * 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.mbeans;


import javax.management.Attribute;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.ReflectionException;
import javax.management.RuntimeOperationsException;
import javax.management.modelmbean.InvalidTargetObjectTypeException;

import org.apache.catalina.deploy.ContextEnvironment;
import org.apache.catalina.deploy.NamingResources;
import org.apache.commons.modeler.BaseModelMBean;


/**
 * <p>A <strong>ModelMBean</strong> implementation for the
 * <code>org.apache.catalina.deploy.ContextEnvironment</code> component.</p>
 *
 * @author Amy Roh
 * @version $Revision$ $Date$
 */

public class ContextEnvironmentMBean extends BaseModelMBean {


    // ----------------------------------------------------------- Constructors


    /**
     * Construct a <code>ModelMBean</code> with default
     * <code>ModelMBeanInfo</code> information.
     *
     * @exception MBeanException if the initializer of an object
     *  throws an exception
     * @exception RuntimeOperationsException if an IllegalArgumentException
     *  occurs
     */
    public ContextEnvironmentMBean()
        throws MBeanException, RuntimeOperationsException {

        super();

    }


    // ----------------------------------------------------- Instance Variables


    // ------------------------------------------------------------- Attributes

    
    /**
     * Set the value of a specific attribute of this MBean.
     *
     * @param attribute The identification of the attribute to be set
     *  and the new value
     *
     * @exception AttributeNotFoundException if this attribute is not
     *  supported by this MBean
     * @exception MBeanException if the initializer of an object
     *  throws an exception
     * @exception ReflectionException if a Java reflection exception
     *  occurs when invoking the getter
     */
     public void setAttribute(Attribute attribute)
        throws AttributeNotFoundException, MBeanException,
        ReflectionException {

        super.setAttribute(attribute);
        
        ContextEnvironment ce = null;
        try {
            ce = (ContextEnvironment) getManagedResource();
        } catch (InstanceNotFoundException e) {
            throw new MBeanException(e);
        } catch (InvalidTargetObjectTypeException e) {
             throw new MBeanException(e);
        }
        
        // cannot use side-efects.  It's removed and added back each time 
        // there is a modification in a resource.
        NamingResources nr = ce.getNamingResources();
        nr.removeEnvironment(ce.getName());
        nr.addEnvironment(ce);
    }
    
}