package org.g4studio.core.mvc.xstruts.config;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.g4studio.core.mvc.xstruts.Globals;
import org.g4studio.core.mvc.xstruts.action.ActionForm;
import org.g4studio.core.mvc.xstruts.action.ActionFormBean;
import org.g4studio.core.mvc.xstruts.action.ActionForward;
import org.g4studio.core.mvc.xstruts.action.ActionMapping;
import org.g4studio.core.mvc.xstruts.action.ActionMessages;
import org.g4studio.core.mvc.xstruts.upload.MultipartRequestWrapper;
import org.g4studio.core.mvc.xstruts.util.MessageResources;
import org.g4studio.core.mvc.xstruts.util.RequestUtils;
/**
* <p>
* NOTE: THIS CLASS IS UNDER ACTIVE DEVELOPMENT. THE CURRENT CODE IS WRITTEN FOR
* CLARITY NOT EFFICIENCY. NOT EVERY API FUNCTION HAS BEEN IMPLEMENTED YET.
* </p>
* <p>
* A helper object to expose the Struts shared resources, which are be stored in
* the application, session, or request contexts, as appropriate.
* </p>
* <p>
* An instance should be created for each request processed. The methods which
* return resources from the request or session contexts are not thread-safe.
* </p>
* <p>
* Provided for use by other servlets in the application so they can easily
* access the Struts shared resources.
* </p>
* <p>
* The resources are stored under attributes in the application, session, or
* request contexts.
* </p>
* <p>
* The ActionConfig methods simply return the resources from under the context
* and key used by the Struts ActionServlet when the resources are created.
* </p>
*
* @version $Rev: 421119 $ $Date: 2005-05-14 02:09:06 -0400 (Sat, 14 May 2005) $
* @since Struts 1.1
*/
public class ConfigHelper implements ConfigHelperInterface {
// -------------------------------------------------------- Properites
/**
* <p>
* The application associated with this instance.
* </p>
*/
private ServletContext application = null;
/**
* <p>
* The session associated with this instance.
* </p>
*/
private HttpSession session = null;
/**
* <p>
* The request associated with this instance.
* </p>
*/
private HttpServletRequest request = null;
/**
* <p>
* The response associated with this instance.
* </p>
*/
private HttpServletResponse response = null;
/**
* <p>
* The forward associated with this instance.
* </p>
*/
private ActionForward forward = null;
public ConfigHelper() {
super();
}
public ConfigHelper(ServletContext application, HttpServletRequest request, HttpServletResponse response) {
super();
this.setResources(application, request, response);
}
/**
* <p>
* Set the application associated with this instance.
* [servlet.getServletContext()]
* </p>
*/
public void setApplication(ServletContext application) {
this.application = application;
}
/**
* <p>
* Set the session associated with this instance.
* </p>
*/
public void setSession(HttpSession session) {
this.session = session;
}
/**
* <p>
* Set the request associated with this object. Session object is also set
* or cleared.
* </p>
*/
public void setRequest(HttpServletRequest request) {
this.request = request;
if (this.request == null) {
setSession(null);
} else {
setSession(this.request.getSession());
}
}
/**
* <p>
* Set the response associated with this isntance. Session object is also
* set or cleared.
* </p>
*/
public void setResponse(HttpServletResponse response) {
this.response = response;
}
/**
* Set the forward associated with this instance.
*/
public void setForward(ActionForward forward) {
this.forward = forward;
}
/**
* <p>
* Set the application and request for this object instance. The
* ServletContext can be set by any servlet in the application. The request
* should be the instant request. Most of the other methods retrieve their
* own objects by reference to the application, request, or session
* attributes. Do not call other methods without setting these first! This
* is also called by the convenience constructor.
* </p>
*
* @param application
* - The associated ServletContext.
* @param request
* - The associated HTTP request.
* @param response
* - The associated HTTP response.
*/
public void setResources(ServletContext application, HttpServletRequest request, HttpServletResponse response) {
setApplication(application);
setRequest(request);
setResponse(response);
}
// ------------------------------------------------ Application Context
public ActionMessages getActionMessages() {
if (this.application == null) {
return null;
}
return (ActionMessages) this.application.getAttribute(Globals.MESSAGE_KEY);
}
/**
* <p>
* The application resources for this application.
* </p>
*/
public MessageResources getMessageResources() {
if (this.application == null) {
return null;
}
return (MessageResources) this.application.getAttribute(Globals.MESSAGES_KEY);
}
/**
* <p>
* The path-mapped pattern (<code>/action/*</code>) or extension mapped
* pattern ((<code>*.do</code>) used to determine our Action URIs in this
* application.
* </p>
*/
public String getServletMapping() {
if (this.application == null) {
return null;
}
return (String) this.application.getAttribute(Globals.SERVLET_KEY);
}
// ---------------------------------------------------- Session Context
/**
* <p>
* The transaction token stored in this session, if it is used.
* </p>
*/
public String getToken() {
if (this.session == null) {
return null;
}
return (String) session.getAttribute(Globals.TRANSACTION_TOKEN_KEY);
}
// ---------------------------------------------------- Request Context
/**
* <p>
* The runtime JspException that may be been thrown by a Struts tag
* extension, or compatible presentation extension, and placed in the
* request.
* </p>
*/
public Throwable getException() {
if (this.request == null) {
return null;
}
return (Throwable) this.request.getAttribute(Globals.EXCEPTION_KEY);
}
/**
* <p>
* The multipart object for this request.
* </p>
*/
public MultipartRequestWrapper getMultipartRequestWrapper() {
if (this.request == null) {
return null;
}
return (MultipartRequestWrapper) this.request.getAttribute(Globals.MULTIPART_KEY);
}
public ActionMapping getMapping() {
if (this.request == null) {
return null;
}
return (ActionMapping) this.request.getAttribute(Globals.MAPPING_KEY);
}
// ---------------------------------------------------- Utility Methods
/**
* <p>
* Return true if a message string for the specified message key is present
* for the user's Locale.
* </p>
*
* @param key
* Message key
*/
public boolean isMessage(String key) {
// Look up the requested MessageResources
MessageResources resources = getMessageResources();
if (resources == null) {
return false;
}
// Return the requested message presence indicator
return resources.isPresent(RequestUtils.getUserLocale(request, null), key);
}
/*
* <p> Retrieve and return the <code>ActionForm</code> bean associated with
* this mapping, creating and stashing one if necessary. If there is no form
* bean associated with this mapping, return <code>null</code>. </p>
*/
public ActionForm getActionForm() {
// Is there a mapping associated with this request?
ActionMapping mapping = getMapping();
if (mapping == null) {
return (null);
}
// Is there a form bean associated with this mapping?
String attribute = mapping.getAttribute();
if (attribute == null) {
return (null);
}
// Look up the existing form bean, if any
ActionForm instance;
if ("request".equals(mapping.getScope())) {
instance = (ActionForm) this.request.getAttribute(attribute);
} else {
instance = (ActionForm) this.session.getAttribute(attribute);
}
return instance;
}
/**
* <p>
* Return the form bean definition associated with the specified logical
* name, if any; otherwise return <code>null</code>.
* </p>
*
* @param name
* Logical name of the requested form bean definition
*/
public ActionFormBean getFormBean(String name) {
return null;
}
/**
* <p>
* Return the forwarding associated with the specified logical name, if any;
* otherwise return <code>null</code>.
* </p>
*
* @param name
* Logical name of the requested forwarding
*/
public ActionForward getActionForward(String name) {
return null;
}
/**
* <p>
* Return the mapping associated with the specified request path, if any;
* otherwise return <code>null</code>.
* </p>
*
* @param path
* Request path for which a mapping is requested
*/
public ActionMapping getActionMapping(String path) {
return null;
}
/**
* <p>
* Return the form action converted into an action mapping path. The value
* of the <code>action</code> property is manipulated as follows in
* computing the name of the requested mapping:
* </p>
*
* <ul>
*
* <li>Any filename extension is removed (on the theory that extension
* mapping is being used to select the controller servlet).</li>
*
* <li>If the resulting value does not start with a slash, then a slash is
* prepended.</li>
*
* </ul>
*/
public String getActionMappingName(String action) {
String value = action;
int question = action.indexOf("?");
if (question >= 0) {
value = value.substring(0, question);
}
int slash = value.lastIndexOf("/");
int period = value.lastIndexOf(".");
if ((period >= 0) && (period > slash)) {
value = value.substring(0, period);
}
if (value.startsWith("/")) {
return (value);
} else {
return ("/" + value);
}
}
/**
* <p>
* Return the form action converted into a server-relative URL.
* </p>
*/
public String getActionMappingURL(String action) {
StringBuffer value = new StringBuffer(this.request.getContextPath());
// Use our servlet mapping, if one is specified
String servletMapping = getServletMapping();
if (servletMapping != null) {
String queryString = null;
int question = action.indexOf("?");
if (question >= 0) {
queryString = action.substring(question);
}
String actionMapping = getActionMappingName(action);
if (servletMapping.startsWith("*.")) {
value.append(actionMapping);
value.append(servletMapping.substring(1));
} else if (servletMapping.endsWith("/*")) {
value.append(servletMapping.substring(0, servletMapping.length() - 2));
value.append(actionMapping);
}
if (queryString != null) {
value.append(queryString);
}
}
// Otherwise, assume extension mapping is in use and extension is
// already included in the action property
else {
if (!action.startsWith("/")) {
value.append("/");
}
value.append(action);
}
// Return the completed value
return (value.toString());
}
/**
* <p>
* Return the url encoded to maintain the user session, if any.
* </p>
*/
public String getEncodeURL(String url) {
if ((session != null) && (response != null)) {
boolean redirect = false;
if (forward != null) {
redirect = forward.getRedirect();
}
if (redirect) {
return response.encodeRedirectURL(url);
} else {
return response.encodeURL(url);
}
} else {
return (url);
}
}
// ------------------------------------------------ Presentation API
/**
* <p>
* Renders the reference for a HTML <base> element
* </p>
*/
public String getOrigRef() {
// HttpServletRequest request =
// (HttpServletRequest)pageContext.getRequest();
if (request == null) {
return null;
}
StringBuffer result = RequestUtils.requestToServerUriStringBuffer(request);
return result.toString();
}
/**
* <p>
* Renders the reference for a HTML <base> element.
* </p>
*/
public String getBaseRef() {
if (request == null) {
return null;
}
StringBuffer result = RequestUtils.requestToServerStringBuffer(request);
String path;
if (forward == null) {
path = request.getRequestURI();
} else {
path = request.getContextPath() + forward.getPath();
}
result.append(path);
return result.toString();
}
/**
* <p>
* Return the path for the specified forward, otherwise return
* <code>null</code>.
* </p>
*
* @param name
* Name given to local or global forward.
*/
public String getLink(String name) {
ActionForward forward = getActionForward(name);
if (forward == null) {
return null;
}
StringBuffer path = new StringBuffer(this.request.getContextPath());
path.append(forward.getPath());
// :TODO: What about runtime parameters?
return getEncodeURL(path.toString());
}
/**
* <p>
* Return the localized message for the specified key, otherwise return
* <code>null</code>.
* </p>
*
* @param key
* Message key
*/
public String getMessage(String key) {
MessageResources resources = getMessageResources();
if (resources == null) {
return null;
}
return resources.getMessage(RequestUtils.getUserLocale(request, null), key);
}
/**
* <p>
* Look up and return a message string, based on the specified parameters.
* </p>
*
* @param key
* Message key to be looked up and returned
* @param args
* Replacement parameters for this message
*/
public String getMessage(String key, Object[] args) {
MessageResources resources = getMessageResources();
if (resources == null) {
return null;
}
// Return the requested message
if (args == null) {
return resources.getMessage(RequestUtils.getUserLocale(request, null), key);
} else {
return resources.getMessage(RequestUtils.getUserLocale(request, null), key, args);
}
}
/**
* <p>
* Return the URL for the specified ActionMapping, otherwise return
* <code>null</code>.
* </p>
*
* @param path
* Name given to local or global forward.
*/
public String getAction(String path) {
return getEncodeURL(getActionMappingURL(path));
}
// --------------------------------------------- Presentation Wrappers
/**
* <p>
* Wrapper for getLink(String)
* </p>
*
* @param name
* Name given to local or global forward.
*/
public String link(String name) {
return getLink(name);
}
/**
* <p>
* Wrapper for getMessage(String)
* </p>
*
* @param key
* Message key
*/
public String message(String key) {
return getMessage(key);
}
/**
* <p>
* Wrapper for getMessage(String,Object[])
* </p>
*
* @param key
* Message key to be looked up and returned
* @param args
* Replacement parameters for this message
*/
public String message(String key, Object[] args) {
return getMessage(key, args);
}
/**
* <p>
* Wrapper for getAction(String)
* </p>
*
* @param path
* Name given to local or global forward.
*/
public String action(String path) {
return getAction(path);
}
}