/*
 * 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.tomcat.util.descriptor.web.ContextResourceLink;
import org.apache.tomcat.util.descriptor.web.NamingResources;
import org.apache.tomcat.util.modeler.BaseModelMBean;


/**
 * <p>A <strong>ModelMBean</strong> implementation for the
 * <code>org.apache.tomcat.util.descriptor.web.ContextResourceLink</code> component.</p>
 *
 * @author Amy Roh
 */
public class ContextResourceLinkMBean 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 ContextResourceLinkMBean()
        throws MBeanException, RuntimeOperationsException {

        super();

    }


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


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

    /**
     * Obtain and return the value of a specific attribute of this MBean.
     *
     * @param name Name of the requested attribute
     *
     * @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
     */
    @Override
    public Object getAttribute(String name)
        throws AttributeNotFoundException, MBeanException,
        ReflectionException {

        // Validate the input parameters
        if (name == null)
            throw new RuntimeOperationsException
                (new IllegalArgumentException("Attribute name is null"),
                 "Attribute name is null");

        ContextResourceLink cl = null;
        try {
            cl = (ContextResourceLink) getManagedResource();
        } catch (InstanceNotFoundException e) {
            throw new MBeanException(e);
        } catch (InvalidTargetObjectTypeException e) {
             throw new MBeanException(e);
        }

        String value = null;
        if ("global".equals(name)) {
            return (cl.getGlobal());
        } else if ("description".equals(name)) {
            return (cl.getDescription());
        } else if ("name".equals(name)) {
            return (cl.getName());
        } else if ("type".equals(name)) {
            return (cl.getType());
        } else {
            value = (String) cl.getProperty(name);
            if (value == null) {
                throw new AttributeNotFoundException
                    ("Cannot find attribute "+name);
            }
        }

        return value;

    }

    /**
     * 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
     */
     @Override
    public void setAttribute(Attribute attribute)
        throws AttributeNotFoundException, MBeanException,
        ReflectionException {

        // Validate the input parameters
        if (attribute == null)
            throw new RuntimeOperationsException
                (new IllegalArgumentException("Attribute is null"),
                 "Attribute is null");

        String name = attribute.getName();
        Object value = attribute.getValue();
        if (name == null)
            throw new RuntimeOperationsException
                (new IllegalArgumentException("Attribute name is null"),
                 "Attribute name is null");

        ContextResourceLink crl = null;
        try {
            crl = (ContextResourceLink) getManagedResource();
        } catch (InstanceNotFoundException e) {
            throw new MBeanException(e);
        } catch (InvalidTargetObjectTypeException e) {
             throw new MBeanException(e);
        }

        if ("global".equals(name)) {
            crl.setGlobal((String)value);
        } else if ("description".equals(name)) {
            crl.setDescription((String)value);
        } else if ("name".equals(name)) {
            crl.setName((String)value);
        } else if ("type".equals(name)) {
            crl.setType((String)value);
        } else {
            crl.setProperty(name, ""+value);
        }

        // cannot use side-effects.  It's removed and added back each time
        // there is a modification in a resource.
        NamingResources nr = crl.getNamingResources();
        nr.removeResourceLink(crl.getName());
        nr.addResourceLink(crl);
    }

}