Package org.apache.jasper.servlet

Class JspCServletContext

java.lang.Object

org.apache.jasper.servlet.JspCServletContext

All Implemented Interfaces:

ServletContext

public class JspCServletContext
extends Object
implements ServletContext

Simple ServletContext implementation without HTTP-specific methods.

Author:

Peter Rossbach (pr@webapp.de)

Field Summary

Fields inherited from interface javax.servlet.ServletContext

ORDERED_LIBS, TEMPDIR

Constructor Summary

Constructors

Constructor	Description
JspCServletContext(PrintWriter aLogWriter, URL aResourceBaseURL, ClassLoader classLoader, boolean validate, boolean blockExternal)	Create a new instance of this ServletContext implementation.

Method Summary

Modifier and Type	Method	Description
FilterRegistration.Dynamic	addFilter(String filterName, Class<? extends Filter> filterClass)	Add filter to context.
FilterRegistration.Dynamic	addFilter(String filterName, String className)	Add filter to context.
FilterRegistration.Dynamic	addFilter(String filterName, Filter filter)	Add filter to context.
void	addListener(Class<? extends EventListener> listenerClass)	TODO SERVLET3 - Add comments
void	addListener(String className)	TODO SERVLET3 - Add comments
<T extends EventListener> void	addListener(T t)	TODO SERVLET3 - Add comments
ServletRegistration.Dynamic	addServlet(String servletName, Class<? extends Servlet> servletClass)	Add servlet to the context.
ServletRegistration.Dynamic	addServlet(String servletName, String className)	Register a servlet implementation for use in this ServletContext.
ServletRegistration.Dynamic	addServlet(String servletName, Servlet servlet)	Register a servlet instance for use in this ServletContext.
<T extends Filter> T	createFilter(Class<T> c)	Create a Filter instance using the given class.
<T extends EventListener> T	createListener(Class<T> c)	TODO SERVLET3 - Add comments
<T extends Servlet> T	createServlet(Class<T> c)	Create an Servlet instance using the given class.
void	declareRoles(String... roleNames)	Add to the declared roles for this ServletContext.
Object	getAttribute(String name)	Return the specified context attribute, if any.
Enumeration<String>	getAttributeNames()	Return an enumeration of context attribute names.
ClassLoader	getClassLoader()	Get the web application class loader associated with this ServletContext.
ServletContext	getContext(String uripath)	Return the servlet context for the specified path.
String	getContextPath()	Return the context path.
Set<SessionTrackingMode>	getDefaultSessionTrackingModes()	Obtains the default session tracking modes for this web application.
int	getEffectiveMajorVersion()	Obtain the major version of the servlet specification for which this web application is implemented.
int	getEffectiveMinorVersion()	Obtain the minor version of the servlet specification for which this web application is implemented.
Set<SessionTrackingMode>	getEffectiveSessionTrackingModes()	Obtains the currently enabled session tracking modes for this web application.
FilterRegistration	getFilterRegistration(String filterName)	TODO SERVLET3 - Add comments
Map<String,? extends FilterRegistration>	getFilterRegistrations()
String	getInitParameter(String name)	Return the specified context initialization parameter.
Enumeration<String>	getInitParameterNames()	Return an enumeration of the names of context initialization parameters.
JspConfigDescriptor	getJspConfigDescriptor()
int	getMajorVersion()	Return the Servlet API major version number.
String	getMimeType(String file)	Return the MIME type for the specified filename.
int	getMinorVersion()	Return the Servlet API minor version number.
RequestDispatcher	getNamedDispatcher(String name)	Return a request dispatcher for the specified servlet name.
String	getRealPath(String path)	Return the real path for the specified context-relative virtual path.
RequestDispatcher	getRequestDispatcher(String path)	Return a request dispatcher for the specified context-relative path.
URL	getResource(String path)	Return a URL object of a resource that is mapped to the specified context-relative path.
InputStream	getResourceAsStream(String path)	Return an InputStream allowing access to the resource at the specified context-relative path.
Set<String>	getResourcePaths(String path)	Return the set of resource paths for the "directory" at the specified context path.
String	getServerInfo()	Return descriptive information about this server.
Servlet	getServlet(String name)	Deprecated. This method has been deprecated with no replacement
String	getServletContextName()	Return the name of this servlet context.
Enumeration<String>	getServletNames()	Deprecated. This method has been deprecated with no replacement
ServletRegistration	getServletRegistration(String servletName)	Obtain the details of the named servlet.
Map<String,? extends ServletRegistration>	getServletRegistrations()	Obtain a Map of servlet names to servlet registrations for all servlets registered with this context.
Enumeration<Servlet>	getServlets()	Deprecated. This method has been deprecated with no replacement
SessionCookieConfig	getSessionCookieConfig()
String	getVirtualServerName()	Get the primary name of the virtual host on which this context is deployed.
void	log(Exception exception, String message)	Deprecated. Use log(String,Throwable) instead
void	log(String message)	Log the specified message.
void	log(String message, Throwable exception)	Log the specified message and exception.
void	removeAttribute(String name)	Remove the specified context attribute.
void	setAttribute(String name, Object value)	Set or replace the specified context attribute.
boolean	setInitParameter(String name, String value)	Set the given initialisation parameter to the given value.
void	setSessionTrackingModes(Set<SessionTrackingMode> sessionTrackingModes)	Configures the available session tracking modes for this web application.

Methods inherited from class java.lang.Object

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

Constructor Details

JspCServletContext

public JspCServletContext(PrintWriter aLogWriter,
 URL aResourceBaseURL,
 ClassLoader classLoader,
 boolean validate,
 boolean blockExternal)
                   throws JasperException

Create a new instance of this ServletContext implementation.

Parameters:

aLogWriter - PrintWriter which is used for log() calls

aResourceBaseURL - Resource base URL

classLoader - Class loader for this ServletContext

validate - Should a validating parser be used to parse web.xml?

blockExternal - Should external entities be blocked when parsing web.xml?

Throws:

JasperException - An error occurred building the merged web.xml

Method Details

getAttribute

public Object getAttribute(String name)

Return the specified context attribute, if any.

Specified by:

getAttribute in interface ServletContext

Parameters:

name - Name of the requested attribute

Returns:

an Object containing the value of the attribute, or null if no attribute exists matching the given name

See Also:

• ServletContext.getAttributeNames()

getAttributeNames

public Enumeration<String> getAttributeNames()

Return an enumeration of context attribute names.

Specified by:

getAttributeNames in interface ServletContext

Returns:

an Enumeration of attribute names

See Also:

• ServletContext.getAttribute(java.lang.String)

getContext

public ServletContext getContext(String uripath)

Return the servlet context for the specified path.

Specified by:

getContext in interface ServletContext

Parameters:

uripath - Server-relative path starting with '/'

Returns:

the ServletContext object that corresponds to the named URL, or null if either none exists or the container wishes to restrict this access.

See Also:

• RequestDispatcher

getContextPath

public String getContextPath()

Return the context path.

Specified by:

getContextPath in interface ServletContext

Returns:

The main context path

getInitParameter

public String getInitParameter(String name)

Return the specified context initialization parameter.

Specified by:

getInitParameter in interface ServletContext

Parameters:

name - Name of the requested parameter

Returns:

a String containing the value of the initialization parameter

See Also:

• ServletConfig.getInitParameter(java.lang.String)

getInitParameterNames

public Enumeration<String> getInitParameterNames()

Return an enumeration of the names of context initialization parameters.

Specified by:

getInitParameterNames in interface ServletContext

Returns:

an Enumeration of String objects containing the names of the context's initialization parameters

See Also:

• ServletConfig.getInitParameter(java.lang.String)

getMajorVersion

public int getMajorVersion()

Return the Servlet API major version number.

Specified by:

getMajorVersion in interface ServletContext

Returns:

3

getMimeType

public String getMimeType(String file)

Return the MIME type for the specified filename.

Specified by:

getMimeType in interface ServletContext

Parameters:

file - Filename whose MIME type is requested

Returns:

a String specifying the file's MIME type

getMinorVersion

public int getMinorVersion()

Return the Servlet API minor version number.

Specified by:

getMinorVersion in interface ServletContext

Returns:

1

getNamedDispatcher

public RequestDispatcher getNamedDispatcher(String name)

Return a request dispatcher for the specified servlet name.

Specified by:

getNamedDispatcher in interface ServletContext

Parameters:

name - Name of the requested servlet

Returns:

a RequestDispatcher object that acts as a wrapper for the named servlet, or null if the ServletContext cannot return a RequestDispatcher

See Also:

• RequestDispatcher
• ServletContext.getContext(java.lang.String)
• ServletConfig.getServletName()

getRealPath

public String getRealPath(String path)

Return the real path for the specified context-relative virtual path.

Specified by:

getRealPath in interface ServletContext

Parameters:

path - The context-relative virtual path to resolve

Returns:

a String specifying the real path, or null if the translation cannot be performed

getRequestDispatcher

public RequestDispatcher getRequestDispatcher(String path)

Return a request dispatcher for the specified context-relative path.

Specified by:

getRequestDispatcher in interface ServletContext

Parameters:

path - Context-relative path for which to acquire a dispatcher

Returns:

a RequestDispatcher object that acts as a wrapper for the resource at the specified path, or null if the ServletContext cannot return a RequestDispatcher

See Also:

• RequestDispatcher
• ServletContext.getContext(java.lang.String)

getResource

public URL getResource(String path)
                throws MalformedURLException

Return a URL object of a resource that is mapped to the specified context-relative path.

Specified by:

getResource in interface ServletContext

Parameters:

path - Context-relative path of the desired resource

Returns:

the resource located at the named path, or null if there is no resource at that path

Throws:

MalformedURLException - if the resource path is not properly formed

getResourceAsStream

public InputStream getResourceAsStream(String path)

Return an InputStream allowing access to the resource at the specified context-relative path.

Specified by:

getResourceAsStream in interface ServletContext

Parameters:

path - Context-relative path of the desired resource

Returns:

the InputStream returned to the servlet, or null if no resource exists at the specified path

getResourcePaths

public Set<String> getResourcePaths(String path)

Return the set of resource paths for the "directory" at the specified context path.

Specified by:

getResourcePaths in interface ServletContext

Parameters:

path - Context-relative base path

Returns:

a Set containing the directory listing, or null if there are no resources in the web application whose path begins with the supplied path.

getServerInfo

public String getServerInfo()

Return descriptive information about this server.

Specified by:

getServerInfo in interface ServletContext

Returns:

a String containing at least the servlet container name and version number

getServlet

@Deprecated
public Servlet getServlet(String name)
                   throws ServletException

Deprecated.

This method has been deprecated with no replacement

Return a null reference for the specified servlet name.

Specified by:

getServlet in interface ServletContext

Parameters:

name - Name of the requested servlet

Returns:

Always null

Throws:

ServletException - never

getServletContextName

public String getServletContextName()

Return the name of this servlet context.

Specified by:

getServletContextName in interface ServletContext

Returns:

The name of the web application or null if no name has been declared in the deployment descriptor.

getServletNames

@Deprecated
public Enumeration<String> getServletNames()

Deprecated.

This method has been deprecated with no replacement

Return an empty enumeration of servlet names.

Specified by:

getServletNames in interface ServletContext

Returns:

Always and empty Enumeration

getServlets

@Deprecated
public Enumeration<Servlet> getServlets()

Deprecated.

This method has been deprecated with no replacement

Return an empty enumeration of servlets.

Specified by:

getServlets in interface ServletContext

Returns:

Always and empty Enumeration

log

public void log(String message)

Log the specified message.

Specified by:

log in interface ServletContext

Parameters:

message - The message to be logged

log

@Deprecated
public void log(Exception exception,
 String message)

Deprecated.

Use log(String,Throwable) instead

Log the specified message and exception.

Specified by:

log in interface ServletContext

Parameters:

exception - The exception to be logged

message - The message to be logged

log

public void log(String message,
 Throwable exception)

Log the specified message and exception.

Specified by:

log in interface ServletContext

Parameters:

message - The message to be logged

exception - The exception to be logged

removeAttribute

public void removeAttribute(String name)

Remove the specified context attribute.

Specified by:

removeAttribute in interface ServletContext

Parameters:

name - Name of the attribute to remove

setAttribute

public void setAttribute(String name,
 Object value)

Set or replace the specified context attribute.

Specified by:

setAttribute in interface ServletContext

Parameters:

name - Name of the context attribute to set

value - Corresponding attribute value

addFilter

public FilterRegistration.Dynamic addFilter(String filterName,
 String className)

Description copied from interface: javax.servlet.ServletContext

Add filter to context.

Specified by:

addFilter in interface ServletContext

Parameters:

filterName - Name of filter to add

className - Name of filter class

Returns:

null if the filter has already been fully defined, else a FilterRegistration.Dynamic object that can be used to further configure the filter

addServlet

public ServletRegistration.Dynamic addServlet(String servletName,
 String className)

Description copied from interface: javax.servlet.ServletContext

Register a servlet implementation for use in this ServletContext.

Specified by:

addServlet in interface ServletContext

Parameters:

servletName - The name of the servlet to register

className - The implementation class for the servlet

Returns:

The registration object that enables further configuration

getDefaultSessionTrackingModes

public Set<SessionTrackingMode> getDefaultSessionTrackingModes()

Description copied from interface: javax.servlet.ServletContext

Obtains the default session tracking modes for this web application. By default SessionTrackingMode.URL is always supported, SessionTrackingMode.COOKIE is supported unless the cookies attribute has been set to false for the context and SessionTrackingMode.SSL is supported if at least one of the connectors used by this context has the attribute secure set to true.

Specified by:

getDefaultSessionTrackingModes in interface ServletContext

Returns:

The set of default session tracking modes for this web application

getEffectiveSessionTrackingModes

public Set<SessionTrackingMode> getEffectiveSessionTrackingModes()

Description copied from interface: javax.servlet.ServletContext

Obtains the currently enabled session tracking modes for this web application.

Specified by:

getEffectiveSessionTrackingModes in interface ServletContext

Returns:

The value supplied via ServletContext.setSessionTrackingModes(Set) if one was previously set, else return the defaults

getSessionCookieConfig

public SessionCookieConfig getSessionCookieConfig()

Specified by:

getSessionCookieConfig in interface ServletContext

Returns:

TODO

setSessionTrackingModes

public void setSessionTrackingModes(Set<SessionTrackingMode> sessionTrackingModes)

Description copied from interface: javax.servlet.ServletContext

Configures the available session tracking modes for this web application.

Specified by:

setSessionTrackingModes in interface ServletContext

Parameters:

sessionTrackingModes - The session tracking modes to use for this web application

addFilter

public FilterRegistration.Dynamic addFilter(String filterName,
 Filter filter)

Description copied from interface: javax.servlet.ServletContext

Add filter to context.

Specified by:

addFilter in interface ServletContext

Parameters:

filterName - Name of filter to add

filter - Filter to add

Returns:

null if the filter has already been fully defined, else a FilterRegistration.Dynamic object that can be used to further configure the filter

addFilter

public FilterRegistration.Dynamic addFilter(String filterName,
 Class<? extends Filter> filterClass)

Description copied from interface: javax.servlet.ServletContext

Add filter to context.

Specified by:

addFilter in interface ServletContext

Parameters:

filterName - Name of filter to add

filterClass - Class of filter to add

Returns:

null if the filter has already been fully defined, else a FilterRegistration.Dynamic object that can be used to further configure the filter

addServlet

public ServletRegistration.Dynamic addServlet(String servletName,
 Servlet servlet)

Description copied from interface: javax.servlet.ServletContext

Register a servlet instance for use in this ServletContext.

Specified by:

addServlet in interface ServletContext

Parameters:

servletName - The name of the servlet to register

servlet - The Servlet instance to register

Returns:

The registration object that enables further configuration

addServlet

public ServletRegistration.Dynamic addServlet(String servletName,
 Class<? extends Servlet> servletClass)

Description copied from interface: javax.servlet.ServletContext

Add servlet to the context.

Specified by:

addServlet in interface ServletContext

Parameters:

servletName - Name of servlet to add

servletClass - Class of servlet to add

Returns:

null if the servlet has already been fully defined, else a ServletRegistration.Dynamic object that can be used to further configure the servlet

createFilter

public <T extends Filter> T createFilter(Class<T> c)
                                  throws ServletException

Description copied from interface: javax.servlet.ServletContext

Create a Filter instance using the given class. The instance is just created. No initialisation occurs.

Specified by:

createFilter in interface ServletContext

Type Parameters:

T - The type for the given class

Parameters:

c - The the class for which an instance should be created

Returns:

The created Filter instance.

Throws:

ServletException - If the Filter instance cannot be created

createServlet

public <T extends Servlet> T createServlet(Class<T> c)
                                    throws ServletException

Description copied from interface: javax.servlet.ServletContext

Create an Servlet instance using the given class. The instance is just created. No initialisation occurs.

Specified by:

createServlet in interface ServletContext

Type Parameters:

T - The type for the given class

Parameters:

c - The the class for which an instance should be created

Returns:

The created Servlet instance.

Throws:

ServletException - If the servlet instance cannot be created.

getFilterRegistration

public FilterRegistration getFilterRegistration(String filterName)

Description copied from interface: javax.servlet.ServletContext

TODO SERVLET3 - Add comments

Specified by:

getFilterRegistration in interface ServletContext

Parameters:

filterName - TODO

Returns:

TODO

getServletRegistration

public ServletRegistration getServletRegistration(String servletName)

Description copied from interface: javax.servlet.ServletContext

Obtain the details of the named servlet.

Specified by:

getServletRegistration in interface ServletContext

Parameters:

servletName - The name of the Servlet of interest

Returns:

The registration details for the named Servlet or null if no Servlet has been registered with the given name

setInitParameter

public boolean setInitParameter(String name,
 String value)

Description copied from interface: javax.servlet.ServletContext

Set the given initialisation parameter to the given value.

Specified by:

setInitParameter in interface ServletContext

Parameters:

name - Name of initialisation parameter

value - Value for initialisation parameter

Returns:

true if the call succeeds or false if the call fails because an initialisation parameter with the same name has already been set

addListener

public void addListener(Class<? extends EventListener> listenerClass)

Description copied from interface: javax.servlet.ServletContext

TODO SERVLET3 - Add comments

Specified by:

addListener in interface ServletContext

Parameters:

listenerClass - TODO

addListener

public void addListener(String className)

Description copied from interface: javax.servlet.ServletContext

TODO SERVLET3 - Add comments

Specified by:

addListener in interface ServletContext

Parameters:

className - TODO

addListener

public <T extends EventListener> void addListener(T t)

Description copied from interface: javax.servlet.ServletContext

TODO SERVLET3 - Add comments

Specified by:

addListener in interface ServletContext

Type Parameters:

T - TODO

Parameters:

t - TODO

createListener

public <T extends EventListener> T createListener(Class<T> c)
                                           throws ServletException

Description copied from interface: javax.servlet.ServletContext

TODO SERVLET3 - Add comments

Specified by:

createListener in interface ServletContext

Type Parameters:

T - TODO

Parameters:

c - TODO

Returns:

TODO

Throws:

ServletException - TODO

declareRoles

public void declareRoles(String... roleNames)

Description copied from interface: javax.servlet.ServletContext

Add to the declared roles for this ServletContext.

Specified by:

declareRoles in interface ServletContext

Parameters:

roleNames - The roles to add

getClassLoader

public ClassLoader getClassLoader()

Description copied from interface: javax.servlet.ServletContext

Get the web application class loader associated with this ServletContext.

Specified by:

getClassLoader in interface ServletContext

Returns:

The associated web application class loader

getEffectiveMajorVersion

public int getEffectiveMajorVersion()

Description copied from interface: javax.servlet.ServletContext

Obtain the major version of the servlet specification for which this web application is implemented.

Specified by:

getEffectiveMajorVersion in interface ServletContext

Returns:

The major version declared in web.xml

getEffectiveMinorVersion

public int getEffectiveMinorVersion()

Description copied from interface: javax.servlet.ServletContext

Obtain the minor version of the servlet specification for which this web application is implemented.

Specified by:

getEffectiveMinorVersion in interface ServletContext

Returns:

The minor version declared in web.xml

getFilterRegistrations

public Map<String,? extends FilterRegistration> getFilterRegistrations()

Specified by:

getFilterRegistrations in interface ServletContext

Returns:

TODO

getJspConfigDescriptor

public JspConfigDescriptor getJspConfigDescriptor()

Specified by:

getJspConfigDescriptor in interface ServletContext

Returns:

TODO

getServletRegistrations

public Map<String,? extends ServletRegistration> getServletRegistrations()

Description copied from interface: javax.servlet.ServletContext

Obtain a Map of servlet names to servlet registrations for all servlets registered with this context.

Specified by:

getServletRegistrations in interface ServletContext

Returns:

A Map of servlet names to servlet registrations for all servlets registered with this context

getVirtualServerName

public String getVirtualServerName()

Description copied from interface: javax.servlet.ServletContext

Get the primary name of the virtual host on which this context is deployed. The name may or may not be a valid host name.

Specified by:

getVirtualServerName in interface ServletContext

Returns:

The primary name of the virtual host on which this context is deployed