Java tutorial
/* * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/mbeans/ContextResourceMBean.java,v 1.8 2002/06/24 21:11:42 amyroh Exp $ * $Revision: 1.8 $ * $Date: 2002/06/24 21:11:42 $ * * ==================================================================== * * The Apache Software License, Version 1.1 * * Copyright (c) 2002 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, if * any, must include the following acknowlegement: * "This product includes software developed by the * Apache Software Foundation (http://www.apache.org/)." * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software * Foundation" must not be used to endorse or promote products derived * from this software without prior written permission. For written * permission, please contact apache@apache.org. * * 5. Products derived from this software may not be called "Apache" * nor may "Apache" appear in their names without prior written * permission of the Apache Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * * [Additional notices, if required by prior licensing conditions] * */ package 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.ContextResource; import org.apache.catalina.deploy.NamingResources; import org.apache.catalina.deploy.ResourceParams; import org.apache.commons.modeler.BaseModelMBean; /** * <p>A <strong>ModelMBean</strong> implementation for the * <code>org.apache.catalina.deploy.ContextResource</code> component.</p> * * @author Amy Roh * @version $Revision: 1.8 $ $Date: 2002/06/24 21:11:42 $ */ public class ContextResourceMBean 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 ContextResourceMBean() 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 */ 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"); ContextResource cr = null; try { cr = (ContextResource) getManagedResource(); } catch (InstanceNotFoundException e) { throw new MBeanException(e); } catch (InvalidTargetObjectTypeException e) { throw new MBeanException(e); } String value = null; if ("auth".equals(name)) { return (cr.getAuth()); } else if ("description".equals(name)) { return (cr.getDescription()); } else if ("name".equals(name)) { return (cr.getName()); } else if ("scope".equals(name)) { return (cr.getScope()); } else if ("type".equals(name)) { return (cr.getType()); } else { NamingResources nr = cr.getNamingResources(); if (nr == null) { throw new AttributeNotFoundException("Cannot find naming resource " + cr.getName()); } ResourceParams rp = nr.findResourceParams(cr.getName()); if (rp == null) { throw new AttributeNotFoundException("Cannot find resource param " + cr.getName()); } value = (String) rp.getParameters().get(name); if (value == null) { throw new AttributeNotFoundException("Cannot find attribute " + name + rp); } } 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 */ 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"); ContextResource cr = null; try { cr = (ContextResource) getManagedResource(); } catch (InstanceNotFoundException e) { throw new MBeanException(e); } catch (InvalidTargetObjectTypeException e) { throw new MBeanException(e); } if ("auth".equals(name)) { cr.setAuth((String) value); } else if ("description".equals(name)) { cr.setDescription((String) value); } else if ("name".equals(name)) { cr.setName((String) value); } else if ("scope".equals(name)) { cr.setScope((String) value); } else if ("type".equals(name)) { cr.setType((String) value); } else { ResourceParams rp = cr.getNamingResources().findResourceParams(cr.getName()); if (rp != null) { String valueStr = "" + value; rp.addParameter(name, valueStr); cr.getNamingResources().removeResourceParams(cr.getName()); } else { rp = new ResourceParams(); rp.setName(cr.getName()); String valueStr = "" + value; rp.addParameter(name, valueStr); } cr.getNamingResources().addResourceParams(rp); } // cannot use side-efects. It's removed and added back each time // there is a modification in a resource. NamingResources nr = cr.getNamingResources(); nr.removeResource(cr.getName()); nr.addResource(cr); } }