/*
    * $Id: ActionConfig.java 480593 2006-11-29 15:17:52Z niallp $
    *
    * 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.struts.config;
  
  import org.apache.commons.beanutils.BeanUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.struts.util.RequestUtils;
  
  import java.lang.reflect.InvocationTargetException;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  
  /**
   * <p>A JavaBean representing the configuration information of an
   * <code>&lt;action&gt;</code> element from a Struts module configuration
   * file.</p>
   *
   * @version $Rev: 480593 $ $Date: 2006-11-29 09:17:52 -0600 (Wed, 29 Nov 2006) $
   * @since Struts 1.1
   */
  public class ActionConfig extends BaseConfig {
      private static final Log log = LogFactory.getLog(ActionConfig.class);
  
      // ----------------------------------------------------- Instance Variables
  
      /**
       * <p> The set of exception handling configurations for this action, if
       * any, keyed by the <code>type</code> property. </p>
       */
      protected HashMap exceptions = new HashMap();
  
      /**
       * <p> The set of local forward configurations for this action, if any,
       * keyed by the <code>name</code> property. </p>
       */
      protected HashMap forwards = new HashMap();
  
      // ------------------------------------------------------------- Properties
  
      /**
       * <p> The module configuration with which we are associated. </p>
       */
      protected ModuleConfig moduleConfig = null;
  
      /**
       * <p> The request-scope or session-scope attribute name under which our
       * form bean is accessed, if it is different from the form bean's
       * specified <code>name</code>. </p>
       */
      protected String attribute = null;
  
      /**
       * <p>The internal identification of this action mapping. Identifications are
       * not inheritable and must be unique within a module.</p>
       *
       * @since Struts 1.3.6
       */
      protected String actionId = null;
  
      /**
       * <p>The path of the ActionConfig that this object should inherit
       * properties from.</p> </p>
       */
      protected String inherit = null;
  
      /**
       * Indicates whether the "cancellable " property has been set or not.
       */
      private boolean cancellableSet = false;
  
      /**
       * <p>Can this Action be cancelled? [false]</p> <p> By default, when an
       * Action is cancelled, validation is bypassed and the Action should not
       * execute the business operation. If a request tries to cancel an Action
       * when cancellable is not set, a "InvalidCancelException" is thrown.
       * </p>
       */
      protected boolean cancellable = false;
  
     /**
      * <p> Have the inheritance values for this class been applied?</p>
      */
     protected boolean extensionProcessed = false;
 
     /**
      * <p> Context-relative path of the web application resource that will
      * process this request via RequestDispatcher.forward(), instead of
      * instantiating and calling the <code>Action</code> class specified by
      * "type". Exactly one of <code>forward</code>, <code>include</code>, or
      * <code>type</code> must be specified. </p>
      */
     protected String forward = null;
 
     /**
      * <p> Context-relative path of the web application resource that will
      * process this request via RequestDispatcher.include(), instead of
      * instantiating and calling the <code>Action</code> class specified by
      * "type". Exactly one of <code>forward</code>, <code>include</code>, or
      * <code>type</code> must be specified. </p>
      */
     protected String include = null;
 
     /**
      * <p> Context-relative path of the input form to which control should be
      * returned if a validation error is encountered.  Required if "name" is
      * specified and the input bean returns validation errors. </p>
      */
     protected String input = null;
 
     /**
      * <p> Fully qualified Java class name of the <code>MultipartRequestHandler</code>
      * implementation class used to process multi-part request data for this
      * Action. </p>
      */
     protected String multipartClass = null;
 
     /**
      * <p> Name of the form bean, if any, associated with this Action. </p>
      */
     protected String name = null;
 
     /**
      * <p> General purpose configuration parameter that can be used to pass
      * extra information to the Action instance selected by this Action.
      * Struts does not itself use this value in any way. </p>
      */
     protected String parameter = null;
 
     /**
      * <p> Context-relative path of the submitted request, starting with a
      * slash ("/") character, and omitting any filename extension if extension
      * mapping is being used. </p>
      */
     protected String path = null;
 
     /**
      * <p> Prefix used to match request parameter names to form bean property
      * names, if any. </p>
      */
     protected String prefix = null;
 
     /**
      * <p> Comma-delimited list of security role names allowed to request this
      * Action. </p>
      */
     protected String roles = null;
 
     /**
      * <p> The set of security role names used to authorize access to this
      * Action, as an array for faster access. </p>
      */
     protected String[] roleNames = new String[0];
 
     /**
      * <p> Identifier of the scope ("request" or "session") within which our
      * form bean is accessed, if any. </p>
      */
     protected String scope = "session";
 
     /**
      * <p> Suffix used to match request parameter names to form bean property
      * names, if any. </p>
      */
     protected String suffix = null;
 
     /**
      * <p> Fully qualified Java class name of the <code>Action</code> class to
      * be used to process requests for this mapping if the
      * <code>forward</code> and <code>include</code> properties are not set.
      * Exactly one of <code>forward</code>, <code>include</code>, or
      * <code>type</code> must be specified.
      */
     protected String type = null;
 
     /**
      * <p> Indicates Action be configured as the default one for this module,
      * when true.
      */
     protected boolean unknown = false;
 
     /**
      * Indicates whether the "validate" property has been set or not.
      */
     private boolean validateSet = false;
 
     /**
      * <p> Should the <code>validate()</code> method of the form bean
      * associated with this action be called?
      */
     protected boolean validate = true;
 
     /**
      * <p> The name of a <code>commons-chain</code> command which should be
      * executed as part of the processing of this action.
      *
      * @since Struts 1.3.0
      */
     protected String command = null;
 
     /**
      * <p> The name of a <code>commons-chain</code> catalog in which
      * <code>command</code> should be sought.  If a <code>command</code> is
      * defined and this property is undefined, the "default" catalog will be
      * used. This is likely to be infrequently used after a future release of
      * <code>commons-chain</code> supports a one-string expression of a
      * catalog/chain combination.
      *
      * @since Struts 1.3.0
      */
     protected String catalog = null;
 
     /**
      * <p>The internal name of this action mapping. If an action has a name, it may be used
      * as a shortcut in a URI. For example, an action with an identification of "editPerson"
      * may be internally forwarded as "editPerson?id=1" which will then resolve to the
      * real URI path at execution time.</p>
      *
      * @return the actionId
      * @since Struts 1.3.6
      */
     public String getActionId() {
         return this.actionId;
     }
 
     /**
      * <p>The internal name of this action mapping. The name is not inheritable,
      * may not contain a forward slash, and must be unique within a module. </p>
      *
      * @param actionId the action identifier
      * @since Struts 1.3.6
      * @throws IllegalStateException if the configuration is frozen
      * @throws IllegalArgumentException if the identifier contains a forward slash
      */
     public void setActionId(String actionId) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
         
         if ((actionId != null) && (actionId.indexOf("/") > -1)) {
             throw new IllegalArgumentException("actionId '" + actionId + "' may not contain a forward slash");
         }
 
         this.actionId = actionId;
     }
 
     /**
      * <p> The module configuration with which we are associated.
      */
     public ModuleConfig getModuleConfig() {
         return (this.moduleConfig);
     }
 
     /**
      * <p> The module configuration with which we are associated.
      */
     public void setModuleConfig(ModuleConfig moduleConfig) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.moduleConfig = moduleConfig;
     }
 
     /**
      * <p> Returns the request-scope or session-scope attribute name under
      * which our form bean is accessed, if it is different from the form
      * bean's specified <code>name</code>.
      *
      * @return attribute name under which our form bean is accessed.
      */
     public String getAttribute() {
         if (this.attribute == null) {
             return (this.name);
         } else {
             return (this.attribute);
         }
     }
 
     /**
      * <p> Set the request-scope or session-scope attribute name under which
      * our form bean is accessed, if it is different from the form bean's
      * specified <code>name</code>.
      *
      * @param attribute the request-scope or session-scope attribute name
      *                  under which our form bean is access.
      */
     public void setAttribute(String attribute) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.attribute = attribute;
     }
 
     /**
      * <p>Accessor for cancellable property</p>
      *
      * @return True if Action can be cancelled
      */
     public boolean getCancellable() {
         return (this.cancellable);
     }
 
     /**
      * <p>Mutator for for cancellable property</p>
      *
      * @param cancellable
      */
     public void setCancellable(boolean cancellable) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.cancellable = cancellable;
         this.cancellableSet = true;
     }
 
     /**
      * <p>Returns the path of the ActionConfig that this object should inherit
      * properties from.</p>
      *
      * @return the path of the ActionConfig that this object should inherit
      *         properties from.
      */
     public String getExtends() {
         return (this.inherit);
     }
 
     /**
      * <p>Set the path of the ActionConfig that this object should inherit
      * properties from.</p>
      *
      * @param inherit the path of the ActionConfig that this object should
      *                inherit properties from.
      */
     public void setExtends(String inherit) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.inherit = inherit;
     }
 
     public boolean isExtensionProcessed() {
         return extensionProcessed;
     }
 
     /**
      * <p> Returns context-relative path of the web application resource that
      * will process this request.
      *
      * @return context-relative path of the web application resource that will
      *         process this request.
      */
     public String getForward() {
         return (this.forward);
     }
 
     /**
      * <p> Set the context-relative path of the web application resource that
      * will process this request. Exactly one of <code>forward</code>,
      * <code>include</code>, or <code>type</code> must be specified.
      *
      * @param forward context-relative path of the web application resource
      *                that will process this request.
      */
     public void setForward(String forward) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.forward = forward;
     }
 
     /**
      * <p> Context-relative path of the web application resource that will
      * process this request.
      *
      * @return Context-relative path of the web application resource that will
      *         process this request.
      */
     public String getInclude() {
         return (this.include);
     }
 
     /**
      * <p> Set context-relative path of the web application resource that will
      * process this request. Exactly one of <code>forward</code>,
      * <code>include</code>, or <code>type</code> must be specified.
      *
      * @param include context-relative path of the web application resource
      *                that will process this request.
      */
     public void setInclude(String include) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.include = include;
     }
 
     /**
      * <p> Get the context-relative path of the input form to which control
      * should be returned if a validation error is encountered.
      *
      * @return context-relative path of the input form to which control should
      *         be returned if a validation error is encountered.
      */
     public String getInput() {
         return (this.input);
     }
 
     /**
      * <p> Set the context-relative path of the input form to which control
      * should be returned if a validation error is encountered.  Required if
      * "name" is specified and the input bean returns validation errors.
      *
      * @param input context-relative path of the input form to which control
      *              should be returned if a validation error is encountered.
      */
     public void setInput(String input) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.input = input;
     }
 
     /**
      * <p> Return the fully qualified Java class name of the
      * <code>MultipartRequestHandler</code> implementation class used to
      * process multi-part request data for this Action.
      */
     public String getMultipartClass() {
         return (this.multipartClass);
     }
 
     /**
      * <p> Set the fully qualified Java class name of the
      * <code>MultipartRequestHandler</code> implementation class used to
      * process multi-part request data for this Action.
      *
      * @param multipartClass fully qualified class name of the
      *                       <code>MultipartRequestHandler</code>
      *                       implementation class.
      */
     public void setMultipartClass(String multipartClass) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.multipartClass = multipartClass;
     }
 
     /**
      * <p> Return name of the form bean, if any, associated with this Action.
      */
     public String getName() {
         return (this.name);
     }
 
     /**
      * @param name name of the form bean associated with this Action.
      */
     public void setName(String name) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.name = name;
     }
 
     /**
      * <p> Return general purpose configuration parameter that can be used to
      * pass extra information to the Action instance selected by this Action.
      * Struts does not itself use this value in any way.
      */
     public String getParameter() {
         return (this.parameter);
     }
 
     /**
      * <p> General purpose configuration parameter that can be used to pass
      * extra information to the Action instance selected by this Action.
      * Struts does not itself use this value in any way.
      *
      * @param parameter General purpose configuration parameter.
      */
     public void setParameter(String parameter) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.parameter = parameter;
     }
 
     /**
      * <p> Return context-relative path of the submitted request, starting
      * with a slash ("/") character, and omitting any filename extension if
      * extension mapping is being used.
      */
     public String getPath() {
         return (this.path);
     }
 
     /**
      * <p> Set context-relative path of the submitted request, starting with a
      * slash ("/") character, and omitting any filename extension if extension
      * mapping is being used.
      *
      * @param path context-relative path of the submitted request.
      */
     public void setPath(String path) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.path = path;
     }
 
     /**
      * <p> Retruns prefix used to match request parameter names to form bean
      * property names, if any.
      */
     public String getPrefix() {
         return (this.prefix);
     }
 
     /**
      * @param prefix Prefix used to match request parameter names to form bean
      *               property names, if any.
      */
     public void setPrefix(String prefix) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.prefix = prefix;
     }
 
     public String getRoles() {
         return (this.roles);
     }
 
     public void setRoles(String roles) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.roles = roles;
 
         if (roles == null) {
             roleNames = new String[0];
 
             return;
         }
 
         ArrayList list = new ArrayList();
 
         while (true) {
             int comma = roles.indexOf(',');
 
             if (comma < 0) {
                 break;
             }
 
             list.add(roles.substring(0, comma).trim());
             roles = roles.substring(comma + 1);
         }
 
         roles = roles.trim();
 
         if (roles.length() > 0) {
             list.add(roles);
         }
 
         roleNames = (String[]) list.toArray(new String[list.size()]);
     }
 
     /**
      * <p> Get array of security role names used to authorize access to this
      * Action.
      */
     public String[] getRoleNames() {
         return (this.roleNames);
     }
 
     /**
      * <p> Get the scope ("request" or "session") within which our form bean
      * is accessed, if any.
      */
     public String getScope() {
         return (this.scope);
     }
 
     /**
      * @param scope scope ("request" or "session") within which our form bean
      *              is accessed, if any.
      */
     public void setScope(String scope) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.scope = scope;
     }
 
     /**
      * <p> Return suffix used to match request parameter names to form bean
      * property names, if any. </p>
      */
     public String getSuffix() {
         return (this.suffix);
     }
 
     /**
      * @param suffix Suffix used to match request parameter names to form bean
      *               property names, if any.
      */
     public void setSuffix(String suffix) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.suffix = suffix;
     }
 
     public String getType() {
         return (this.type);
     }
 
     public void setType(String type) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.type = type;
     }
 
     /**
      * <p> Determine whether Action is configured as the default one for this
      * module. </p>
      */
     public boolean getUnknown() {
         return (this.unknown);
     }
 
     /**
      * @param unknown Indicates Action is configured as the default one for
      *                this module, when true.
      */
     public void setUnknown(boolean unknown) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.unknown = unknown;
     }
 
     public boolean getValidate() {
         return (this.validate);
     }
 
     public void setValidate(boolean validate) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.validate = validate;
         this.validateSet = true;
     }
 
     /**
      * <p> Get the name of a <code>commons-chain</code> command which should
      * be executed as part of the processing of this action. </p>
      *
      * @return name of a <code>commons-chain</code> command which should be
      *         executed as part of the processing of this action.
      * @since Struts 1.3.0
      */
     public String getCommand() {
         return (this.command);
     }
 
     /**
      * <p> Get the name of a <code>commons-chain</code> catalog in which a
      * specified command should be sought.  This is likely to be infrequently
      * used after a future release of <code>commons-chain</code> supports a
      * one-string expression of a catalog/chain combination. </p>
      *
      * @return name of a <code>commons-chain</code> catalog in which a
      *         specified command should be sought.
      * @since Struts 1.3.0
      */
     public String getCatalog() {
         return (this.catalog);
     }
 
     /**
      * <p> Set the name of a <code>commons-chain</code> command which should
      * be executed as part of the processing of this action. </p>
      *
      * @param command name of a <code>commons-chain</code> command which
      *                should be executed as part of the processing of this
      *                action.
      * @since Struts 1.3.0
      */
     public void setCommand(String command) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.command = command;
     }
 
     /**
      * <p> Set the name of a <code>commons-chain</code> catalog in which a
      * specified command should be sought. This is likely to be infrequently
      * used after a future release of <code>commons-chain</code> supports a
      * one-string expression of a catalog/chain combination. </p>
      *
      * @param catalog name of a <code>commons-chain</code> catalog in which a
      *                specified command should be sought.
      * @since Struts 1.3.0
      */
     public void setCatalog(String catalog) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         this.catalog = catalog;
     }
 
     // ------------------------------------------------------ Protected Methods
 
     /**
      * <p>Traces the hierarchy of this object to check if any of the ancestors
      * is extending this instance.</p>
      *
      * @param moduleConfig The configuration for the module being configured.
      * @return true if circular inheritance was detected.
      */
     protected boolean checkCircularInheritance(ModuleConfig moduleConfig) {
         String ancestorPath = getExtends();
 
         while (ancestorPath != null) {
             // check if we have the same path as an ancestor
             if (getPath().equals(ancestorPath)) {
                 return true;
             }
 
             // get our ancestor's ancestor
             ActionConfig ancestor = moduleConfig.findActionConfig(ancestorPath);
 
             if (ancestor != null) {
                 ancestorPath = ancestor.getExtends();
             } else {
                 ancestorPath = null;
             }
         }
 
         return false;
     }
 
     /**
      * <p>Compare the exception handlers of this action with that of the given
      * and copy those that are not present.</p>
      *
      * @param baseConfig The action config to copy handlers from.
      * @see #inheritFrom(ActionConfig)
      */
     protected void inheritExceptionHandlers(ActionConfig baseConfig)
         throws ClassNotFoundException, IllegalAccessException,
             InstantiationException, InvocationTargetException {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         // Inherit exception handler configs
         ExceptionConfig[] baseHandlers = baseConfig.findExceptionConfigs();
 
         for (int i = 0; i < baseHandlers.length; i++) {
             ExceptionConfig baseHandler = baseHandlers[i];
 
             // Do we have this handler?
             ExceptionConfig copy =
                 this.findExceptionConfig(baseHandler.getType());
 
             if (copy == null) {
                 // We don't have this, so let's copy it
                 copy =
                     (ExceptionConfig) RequestUtils.applicationInstance(baseHandler.getClass()
                                                                                   .getName());
 
                 BeanUtils.copyProperties(copy, baseHandler);
                 this.addExceptionConfig(copy);
                 copy.setProperties(baseHandler.copyProperties());
             } else {
                 // process any extension that this config might have
                 copy.processExtends(getModuleConfig(), this);
             }
         }
     }
 
     /**
      * <p>Compare the forwards of this action with that of the given and copy
      * those that are not present.</p>
      *
      * @param baseConfig The action config to copy forwards from.
      * @see #inheritFrom(ActionConfig)
      */
     protected void inheritForwards(ActionConfig baseConfig)
         throws ClassNotFoundException, IllegalAccessException,
             InstantiationException, InvocationTargetException {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         // Inherit forward configs
         ForwardConfig[] baseForwards = baseConfig.findForwardConfigs();
 
         for (int i = 0; i < baseForwards.length; i++) {
             ForwardConfig baseForward = baseForwards[i];
 
             // Do we have this forward?
             ForwardConfig copy = this.findForwardConfig(baseForward.getName());
 
             if (copy == null) {
                 // We don't have this, so let's copy it
                 copy =
                     (ForwardConfig) RequestUtils.applicationInstance(baseForward.getClass()
                                                                                 .getName());
                 BeanUtils.copyProperties(copy, baseForward);
 
                 this.addForwardConfig(copy);
                 copy.setProperties(baseForward.copyProperties());
             } else {
                 // process any extension for this forward
                 copy.processExtends(getModuleConfig(), this);
             }
         }
     }
 
     // --------------------------------------------------------- Public Methods
 
     /**
      * <p> Add a new <code>ExceptionConfig</code> instance to the set
      * associated with this action. </p>
      *
      * @param config The new configuration instance to be added
      * @throws IllegalStateException if this module configuration has been
      *                               frozen
      */
     public void addExceptionConfig(ExceptionConfig config) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         exceptions.put(config.getType(), config);
     }
 
     /**
      * <p> Add a new <code>ForwardConfig</code> instance to the set of global
      * forwards associated with this action. </p>
      *
      * @param config The new configuration instance to be added
      * @throws IllegalStateException if this module configuration has been
      *                               frozen
      */
     public void addForwardConfig(ForwardConfig config) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         forwards.put(config.getName(), config);
     }
 
     /**
      * <p> Return the exception configuration for the specified type, if any;
      * otherwise return <code>null</code>. </p>
      *
      * @param type Exception class name to find a configuration for
      */
     public ExceptionConfig findExceptionConfig(String type) {
         return ((ExceptionConfig) exceptions.get(type));
     }
 
     /**
      * <p> Return the exception configurations for this action.  If there are
      * none, a zero-length array is returned. </p>
      */
     public ExceptionConfig[] findExceptionConfigs() {
         ExceptionConfig[] results = new ExceptionConfig[exceptions.size()];
 
         return ((ExceptionConfig[]) exceptions.values().toArray(results));
     }
 
     /**
      * <p>Find and return the <code>ExceptionConfig</code> instance defining
      * how <code>Exceptions</code> of the specified type should be handled.
      * This is performed by checking local and then global configurations for
      * the specified exception's class, and then looking up the superclass
      * chain (again checking local and then global configurations). If no
      * handler configuration can be found, return <code>null</code>.</p>
      *
      * <p>Introduced in <code>ActionMapping</code> in Struts 1.1, but pushed
      * up to <code>ActionConfig</code> in Struts 1.2.0.</p>
      *
      * @param type Exception class for which to find a handler
      * @since Struts 1.2.0
      */
     public ExceptionConfig findException(Class type) {
         // Check through the entire superclass hierarchy as needed
         ExceptionConfig config;
 
         while (true) {
             // Check for a locally defined handler
             String name = type.getName();
 
             log.debug("findException: look locally for " + name);
             config = findExceptionConfig(name);
 
             if (config != null) {
                 return (config);
             }
 
             // Check for a globally defined handler
             log.debug("findException: look globally for " + name);
             config = getModuleConfig().findExceptionConfig(name);
 
             if (config != null) {
                 return (config);
             }
 
             // Loop again for our superclass (if any)
             type = type.getSuperclass();
 
             if (type == null) {
                 break;
             }
         }
 
         return (null); // No handler has been configured
     }
 
     /**
      * <p> Return the forward configuration for the specified key, if any;
      * otherwise return <code>null</code>. </p>
      *
      * @param name Name of the forward configuration to return
      */
     public ForwardConfig findForwardConfig(String name) {
         return ((ForwardConfig) forwards.get(name));
     }
 
     /**
      * <p> Return all forward configurations for this module.  If there are
      * none, a zero-length array is returned. </p>
      */
     public ForwardConfig[] findForwardConfigs() {
         ForwardConfig[] results = new ForwardConfig[forwards.size()];
 
         return ((ForwardConfig[]) forwards.values().toArray(results));
     }
 
     /**
      * <p> Freeze the configuration of this action. </p>
      */
     public void freeze() {
         super.freeze();
 
         ExceptionConfig[] econfigs = findExceptionConfigs();
 
         for (int i = 0; i < econfigs.length; i++) {
             econfigs[i].freeze();
         }
 
         ForwardConfig[] fconfigs = findForwardConfigs();
 
         for (int i = 0; i < fconfigs.length; i++) {
             fconfigs[i].freeze();
         }
     }
 
     /**
      * <p>Inherit values that have not been overridden from the provided
      * config object.  Subclasses overriding this method should verify that
      * the given parameter is of a class that contains a property it is trying
      * to inherit:</p>
      *
      * <pre>
      * if (config instanceof MyCustomConfig) {
      *     MyCustomConfig myConfig =
      *         (MyCustomConfig) config;
      *
      *     if (getMyCustomProp() == null) {
      *         setMyCustomProp(myConfig.getMyCustomProp());
      *     }
      * }
      * </pre>
      *
      * <p>If the given <code>config</code> is extending another object, those
      * extensions should be resolved before it's used as a parameter to this
      * method.</p>
      *
      * @param config The object that this instance will be inheriting its
      *               values from.
      * @see #processExtends(ModuleConfig)
      */
     public void inheritFrom(ActionConfig config)
         throws ClassNotFoundException, IllegalAccessException,
             InstantiationException, InvocationTargetException {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         // Inherit values that have not been overridden
         if (getAttribute() == null) {
             setAttribute(config.getAttribute());
         }
 
         if (!cancellableSet) {
             setCancellable(config.getCancellable());
         }
 
         if (getCatalog() == null) {
             setCatalog(config.getCatalog());
         }
 
         if (getCommand() == null) {
             setCommand(config.getCommand());
         }
 
         if (getForward() == null) {
             setForward(config.getForward());
         }
 
         if (getInclude() == null) {
             setInclude(config.getInclude());
         }
 
         if (getInput() == null) {
             setInput(config.getInput());
         }
 
         if (getMultipartClass() == null) {
             setMultipartClass(config.getMultipartClass());
         }
 
         if (getName() == null) {
             setName(config.getName());
         }
 
         if (getParameter() == null) {
             setParameter(config.getParameter());
         }
 
         if (getPath() == null) {
             setPath(config.getPath());
         }
 
         if (getPrefix() == null) {
             setPrefix(config.getPrefix());
         }
 
         if (getRoles() == null) {
             setRoles(config.getRoles());
         }
 
         if (getScope().equals("session")) {
             setScope(config.getScope());
         }
 
         if (getSuffix() == null) {
             setSuffix(config.getSuffix());
         }
 
         if (getType() == null) {
             setType(config.getType());
         }
 
         if (!getUnknown()) {
             setUnknown(config.getUnknown());
         }
 
         if (!validateSet) {
             setValidate(config.getValidate());
         }
 
         inheritExceptionHandlers(config);
         inheritForwards(config);
         inheritProperties(config);
     }
 
     /**
      * <p>Inherit configuration information from the ActionConfig that this
      * instance is extending.  This method verifies that any action config
      * object that it inherits from has also had its processExtends() method
      * called.</p>
      *
      * @param moduleConfig The {@link ModuleConfig} that this bean is from.
      * @see #inheritFrom(ActionConfig)
      */
     public void processExtends(ModuleConfig moduleConfig)
         throws ClassNotFoundException, IllegalAccessException,
             InstantiationException, InvocationTargetException {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         String ancestorPath = getExtends();
 
         if ((!extensionProcessed) && (ancestorPath != null)) {
             ActionConfig baseConfig =
                 moduleConfig.findActionConfig(ancestorPath);
 
             if (baseConfig == null) {
                 throw new NullPointerException("Unable to find "
                     + "action for '" + ancestorPath + "' to extend.");
             }
 
             // Check against circular inheritance and make sure the base
             //  config's own extends has been processed already
             if (checkCircularInheritance(moduleConfig)) {
                 throw new IllegalArgumentException(
                     "Circular inheritance detected for action " + getPath());
             }
 
             // Make sure the ancestor's own extension has been processed.
             if (!baseConfig.isExtensionProcessed()) {
                 baseConfig.processExtends(moduleConfig);
             }
 
             // Copy values from the base config
             inheritFrom(baseConfig);
         }
 
         extensionProcessed = true;
     }
 
     /**
      * <p> Remove the specified exception configuration instance. </p>
      *
      * @param config ExceptionConfig instance to be removed
      * @throws IllegalStateException if this module configuration has been
      *                               frozen
      */
     public void removeExceptionConfig(ExceptionConfig config) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         exceptions.remove(config.getType());
     }
 
     /**
      * <p> Remove the specified forward configuration instance. </p>
      *
      * @param config ForwardConfig instance to be removed
      * @throws IllegalStateException if this module configuration has been
      *                               frozen
      */
     public void removeForwardConfig(ForwardConfig config) {
         if (configured) {
             throw new IllegalStateException("Configuration is frozen");
         }
 
         forwards.remove(config.getName());
     }
 
     /**
      * <p> Return a String representation of this object. </p>
      */
     public String toString() {
         StringBuffer sb = new StringBuffer("ActionConfig[");
 
         sb.append("cancellable=");
         sb.append(cancellable);
 
         sb.append(",path=");
         sb.append(path);
 
         sb.append(",validate=");
         sb.append(validate);
 
         if (actionId != null) {
             sb.append(",actionId=");
             sb.append(actionId);
         }
 
         if (attribute != null) {
             sb.append(",attribute=");
             sb.append(attribute);
         }
 
         if (catalog != null) {
             sb.append(",catalog=");
             sb.append(catalog);
         }
 
         if (command != null) {
             sb.append(",command=");
             sb.append(command);
         }
 
         if (inherit != null) {
             sb.append(",extends=");
             sb.append(inherit);
         }
 
         if (forward != null) {
             sb.append(",forward=");
             sb.append(forward);
         }
 
         if (include != null) {
             sb.append(",include=");
             sb.append(include);
         }
 
         if (input != null) {
             sb.append(",input=");
             sb.append(input);
         }
 
         if (multipartClass != null) {
             sb.append(",multipartClass=");
             sb.append(multipartClass);
         }
 
         if (name != null) {
             sb.append(",name=");
             sb.append(name);
         }
 
         if (parameter != null) {
             sb.append(",parameter=");
             sb.append(parameter);
         }
 
         if (prefix != null) {
             sb.append(",prefix=");
             sb.append(prefix);
         }
 
         if (roles != null) {
             sb.append(",roles=");
             sb.append(roles);
         }
 
         if (scope != null) {
             sb.append(",scope=");
             sb.append(scope);
         }
 
         if (suffix != null) {
             sb.append(",suffix=");
             sb.append(suffix);
         }
 
         if (type != null) {
             sb.append(",type=");
             sb.append(type);
         }
 
         return (sb.toString());
     }
 }