org.codehaus.groovy.grails.web.util

Class WebUtils

java.lang.Object

org.springframework.web.util.WebUtils

org.codehaus.groovy.grails.web.util.WebUtils

public class WebUtils
extends org.springframework.web.util.WebUtils

Utility methods to access commons objects and perform common web related functions for the internal framework.

Since:

1.0

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DISPATCH_ACTION_PARAMETER
static java.lang.String	ENABLE_FILE_EXTENSIONS
static java.lang.String	EXCEPTION_ATTRIBUTE
static java.lang.String	GRAILS_DISPATCH_EXTENSION
static java.lang.String	GRAILS_SERVLET_PATH
static java.lang.String	LAYOUT_ATTRIBUTE
static java.lang.String	RENDERING_VIEW
static java.lang.String	SEND_ALLOW_HEADER_FOR_INVALID_HTTP_METHOD
static char	SLASH

Fields inherited from class org.springframework.web.util.WebUtils

CONTENT_TYPE_CHARSET_PREFIX, DEFAULT_CHARACTER_ENCODING, DEFAULT_WEB_APP_ROOT_KEY, ERROR_EXCEPTION_ATTRIBUTE, ERROR_EXCEPTION_TYPE_ATTRIBUTE, ERROR_MESSAGE_ATTRIBUTE, ERROR_REQUEST_URI_ATTRIBUTE, ERROR_SERVLET_NAME_ATTRIBUTE, ERROR_STATUS_CODE_ATTRIBUTE, FORWARD_CONTEXT_PATH_ATTRIBUTE, FORWARD_PATH_INFO_ATTRIBUTE, FORWARD_QUERY_STRING_ATTRIBUTE, FORWARD_REQUEST_URI_ATTRIBUTE, FORWARD_SERVLET_PATH_ATTRIBUTE, HTML_ESCAPE_CONTEXT_PARAM, INCLUDE_CONTEXT_PATH_ATTRIBUTE, INCLUDE_PATH_INFO_ATTRIBUTE, INCLUDE_QUERY_STRING_ATTRIBUTE, INCLUDE_REQUEST_URI_ATTRIBUTE, INCLUDE_SERVLET_PATH_ATTRIBUTE, RESPONSE_ENCODED_HTML_ESCAPE_CONTEXT_PARAM, SESSION_MUTEX_ATTRIBUTE, SUBMIT_IMAGE_SUFFIXES, TEMP_DIR_CONTEXT_ATTRIBUTE, WEB_APP_ROOT_KEY_PARAM

Constructor Summary

Constructors

Constructor and Description
WebUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static java.lang.String	addViewPrefix(java.lang.String viewName)
static java.lang.String	addViewPrefix(java.lang.String viewName, java.lang.String controllerName)
static boolean	areFileExtensionsEnabled() Returns the value of the "grails.mime.file.extensions" setting configured in COnfig.groovy
static void	cleanupIncludeRequestAttributes(javax.servlet.http.HttpServletRequest request, java.util.Map<java.lang.String,java.lang.Object> toRestore)
static void	clearGrailsWebRequest() Removes any GrailsWebRequest instance from the current request.
static void	exposeIncludeRequestAttributes(javax.servlet.http.HttpServletRequest request) Expose the current request URI and paths as HttpServletRequest attributes under the keys defined in the Servlet 2.4 specification, for containers that implement 2.3 or an earlier version of the Servlet API: javax.servlet.forward.request_uri, javax.servlet.forward.context_path, javax.servlet.forward.servlet_path, javax.servlet.forward.path_info, javax.servlet.forward.query_string.
static java.util.Map<java.lang.String,java.lang.Object>	exposeRequestAttributesAndReturnOldValues(javax.servlet.http.HttpServletRequest request, java.util.Map<java.lang.String,?> attributes)
static org.springframework.context.ApplicationContext	findApplicationContext(javax.servlet.ServletContext servletContext) Locates the ApplicationContext, returns null if not found
static java.util.Map<java.lang.String,java.lang.Object>	fromQueryString(java.lang.String queryString) Takes a query string and returns the results as a map where the values are either a single entry or a list of values
static java.lang.String	getFormatFromURI(java.lang.String uri) Obtains the format from the URI.
static java.lang.String	getFormatFromURI(java.lang.String uri, org.codehaus.groovy.grails.web.mime.MimeType[] mimeTypes) Obtains the format from the URI.
static java.lang.String	getForwardURI(javax.servlet.http.HttpServletRequest request) Obtains the forwardURI from the request, since Grails uses a forwarding technique for URL mappings.
static java.lang.String	getRequestURIForGrailsDispatchURI(javax.servlet.http.HttpServletRequest request) The Grails dispatch servlet maps URIs like /app/grails/example/index.dispatch.
static org.codehaus.groovy.grails.commons.GrailsApplication	lookupApplication(javax.servlet.ServletContext servletContext) Looks up the GrailsApplication instance
static org.springframework.web.servlet.HandlerInterceptor[]	lookupHandlerInterceptors(javax.servlet.ServletContext servletContext) Looks up all of the HandlerInterceptor instances registered for the application
static org.springframework.web.servlet.ViewResolver	lookupViewResolver(org.springframework.context.ApplicationContext wac)
static org.springframework.web.servlet.ViewResolver	lookupViewResolver(javax.servlet.ServletContext servletContext)
static org.springframework.web.context.request.WebRequestInterceptor[]	lookupWebRequestInterceptors(javax.servlet.ServletContext servletContext) Looks up all of the WebRequestInterceptor instances registered with the application
static org.springframework.web.servlet.View	resolveView(javax.servlet.http.HttpServletRequest request, java.lang.String viewName, java.lang.String controllerName, org.springframework.web.servlet.ViewResolver viewResolver) Resolves a view for the given view name and controller name
static GrailsWebRequest	retrieveGrailsWebRequest() Returns the GrailsWebRequest associated with the current request.
static void	storeGrailsWebRequest(GrailsWebRequest webRequest) Helper method to store the given GrailsWebRequest for the current request.
static java.lang.String	toQueryString(java.util.Map parameters) Converts the given parameters to a query string using the default UTF-8 encoding
static java.lang.String	toQueryString(java.util.Map params, java.lang.String encoding) Converts the given params into a query string started with ?

Methods inherited from class org.springframework.web.util.WebUtils

clearErrorRequestAttributes, exposeErrorRequestAttributes, exposeRequestAttributes, extractFilenameFromUrlPath, extractFullFilenameFromUrlPath, findParameterValue, findParameterValue, getCookie, getDefaultHtmlEscape, getNativeRequest, getNativeResponse, getOrCreateSessionAttribute, getParametersStartingWith, getRealPath, getRequiredSessionAttribute, getResponseEncodedHtmlEscape, getSessionAttribute, getSessionId, getSessionMutex, getTargetPage, getTempDir, hasSubmitParameter, isDefaultHtmlEscape, isIncludeRequest, isValidOrigin, parseMatrixVariables, removeWebAppRootSystemProperty, setSessionAttribute, setWebAppRootSystemProperty

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SLASH

public static final char SLASH

See Also:

Constant Field Values

ENABLE_FILE_EXTENSIONS

public static final java.lang.String ENABLE_FILE_EXTENSIONS

See Also:

Constant Field Values

DISPATCH_ACTION_PARAMETER

public static final java.lang.String DISPATCH_ACTION_PARAMETER

See Also:

Constant Field Values

SEND_ALLOW_HEADER_FOR_INVALID_HTTP_METHOD

public static final java.lang.String SEND_ALLOW_HEADER_FOR_INVALID_HTTP_METHOD

See Also:

Constant Field Values

LAYOUT_ATTRIBUTE

public static final java.lang.String LAYOUT_ATTRIBUTE

See Also:

Constant Field Values

RENDERING_VIEW

public static final java.lang.String RENDERING_VIEW

See Also:

Constant Field Values

GRAILS_DISPATCH_EXTENSION

public static final java.lang.String GRAILS_DISPATCH_EXTENSION

See Also:

Constant Field Values

GRAILS_SERVLET_PATH

public static final java.lang.String GRAILS_SERVLET_PATH

See Also:

Constant Field Values

EXCEPTION_ATTRIBUTE

public static final java.lang.String EXCEPTION_ATTRIBUTE

See Also:

Constant Field Values

Constructor Detail

WebUtils

public WebUtils()

Method Detail

lookupViewResolver

public static org.springframework.web.servlet.ViewResolver lookupViewResolver(javax.servlet.ServletContext servletContext)

lookupViewResolver

public static org.springframework.web.servlet.ViewResolver lookupViewResolver(org.springframework.context.ApplicationContext wac)

lookupHandlerInterceptors

public static org.springframework.web.servlet.HandlerInterceptor[] lookupHandlerInterceptors(javax.servlet.ServletContext servletContext)

Looks up all of the HandlerInterceptor instances registered for the application

Parameters:

servletContext - The ServletContext instance

Returns:

An array of HandlerInterceptor instances

lookupWebRequestInterceptors

public static org.springframework.web.context.request.WebRequestInterceptor[] lookupWebRequestInterceptors(javax.servlet.ServletContext servletContext)

Looks up all of the WebRequestInterceptor instances registered with the application

Parameters:

servletContext - The ServletContext instance

Returns:

An array of WebRequestInterceptor instances

getRequestURIForGrailsDispatchURI

public static java.lang.String getRequestURIForGrailsDispatchURI(javax.servlet.http.HttpServletRequest request)

The Grails dispatch servlet maps URIs like /app/grails/example/index.dispatch. This method infers the controller URI for the dispatch URI so that /app/grails/example/index.dispatch becomes /app/example/index

Parameters:

request - The request

lookupApplication

public static org.codehaus.groovy.grails.commons.GrailsApplication lookupApplication(javax.servlet.ServletContext servletContext)

Looks up the GrailsApplication instance

Returns:

The GrailsApplication instance

findApplicationContext

public static org.springframework.context.ApplicationContext findApplicationContext(javax.servlet.ServletContext servletContext)

Locates the ApplicationContext, returns null if not found

Parameters:

servletContext - The servlet context

Returns:

The ApplicationContext

resolveView

public static org.springframework.web.servlet.View resolveView(javax.servlet.http.HttpServletRequest request,
                                               java.lang.String viewName,
                                               java.lang.String controllerName,
                                               org.springframework.web.servlet.ViewResolver viewResolver)
                                                        throws java.lang.Exception

Resolves a view for the given view name and controller name

Parameters:

request - The request

viewName - The view name

controllerName - The controller name

viewResolver - The resolver

Returns:

A View or null

Throws:

java.lang.Exception - Thrown if an error occurs

addViewPrefix

public static java.lang.String addViewPrefix(java.lang.String viewName)

addViewPrefix

public static java.lang.String addViewPrefix(java.lang.String viewName,
                             java.lang.String controllerName)

exposeRequestAttributesAndReturnOldValues

public static java.util.Map<java.lang.String,java.lang.Object> exposeRequestAttributesAndReturnOldValues(javax.servlet.http.HttpServletRequest request,
                                                                                         java.util.Map<java.lang.String,?> attributes)

cleanupIncludeRequestAttributes

public static void cleanupIncludeRequestAttributes(javax.servlet.http.HttpServletRequest request,
                                   java.util.Map<java.lang.String,java.lang.Object> toRestore)

exposeIncludeRequestAttributes

public static void exposeIncludeRequestAttributes(javax.servlet.http.HttpServletRequest request)

Expose the current request URI and paths as HttpServletRequest attributes under the keys defined in the Servlet 2.4 specification, for containers that implement 2.3 or an earlier version of the Servlet API: javax.servlet.forward.request_uri, javax.servlet.forward.context_path, javax.servlet.forward.servlet_path, javax.servlet.forward.path_info, javax.servlet.forward.query_string.

Does not override values if already present, to not cause conflicts with the attributes exposed by Servlet 2.4+ containers themselves.

Parameters:

request - current servlet request

fromQueryString

public static java.util.Map<java.lang.String,java.lang.Object> fromQueryString(java.lang.String queryString)

Takes a query string and returns the results as a map where the values are either a single entry or a list of values

Parameters:

queryString - The query String

Returns:

A map

toQueryString

public static java.lang.String toQueryString(java.util.Map params,
                             java.lang.String encoding)
                                      throws java.io.UnsupportedEncodingException

Converts the given params into a query string started with ?

Parameters:

params - The params

encoding - The encoding to use

Returns:

The query string

Throws:

java.io.UnsupportedEncodingException - If the given encoding is not supported

toQueryString

public static java.lang.String toQueryString(java.util.Map parameters)
                                      throws java.io.UnsupportedEncodingException

Converts the given parameters to a query string using the default UTF-8 encoding

Parameters:

parameters - The parameters

Returns:

The query string

Throws:

java.io.UnsupportedEncodingException - If UTF-8 encoding is not supported

getFormatFromURI

public static java.lang.String getFormatFromURI(java.lang.String uri)

Obtains the format from the URI. The format is the string following the . file extension in the last token of the URI. If nothing comes after the ".", this method assumes that there is no format and returns null.

Parameters:

uri - The URI

Returns:

The format or null if none

getFormatFromURI

public static java.lang.String getFormatFromURI(java.lang.String uri,
                                org.codehaus.groovy.grails.web.mime.MimeType[] mimeTypes)

Obtains the format from the URI. The format is the string following the . file extension in the last token of the URI. If nothing comes after the ".", this method assumes that there is no format and returns null.

Parameters:

uri - The URI

mimeTypes - The configured mime types

Returns:

The format or null if none

areFileExtensionsEnabled

public static boolean areFileExtensionsEnabled()

Returns the value of the "grails.mime.file.extensions" setting configured in COnfig.groovy

Returns:

true if file extensions are enabled

retrieveGrailsWebRequest

public static GrailsWebRequest retrieveGrailsWebRequest()

Returns the GrailsWebRequest associated with the current request. This is the preferred means of accessing the GrailsWebRequest instance. If the exception is undesired, you can use RequestContextHolder.getRequestAttributes() instead.

Throws:

java.lang.IllegalStateException - if this is called outside of a request.

storeGrailsWebRequest

public static void storeGrailsWebRequest(GrailsWebRequest webRequest)

Helper method to store the given GrailsWebRequest for the current request. Ensures consistency between RequestContextHolder and the relevant request attribute. This is the preferred means of updating the current web request.

clearGrailsWebRequest

public static void clearGrailsWebRequest()

Removes any GrailsWebRequest instance from the current request.

getForwardURI

public static java.lang.String getForwardURI(javax.servlet.http.HttpServletRequest request)

Obtains the forwardURI from the request, since Grails uses a forwarding technique for URL mappings. The actual request URI is held within a request attribute

Parameters:

request - The request

Returns:

The forward URI