Module jakarta.servlet

Package jakarta.servlet

Interface Registration

All Known Subinterfaces:

FilterRegistration, FilterRegistration.Dynamic, Registration.Dynamic, ServletRegistration, ServletRegistration.Dynamic

public interface Registration

Interface through which a Servlet or Filter may be further configured.

A Registration object whose getClassName() method returns null is considered preliminary. Servlets and Filters whose implementation class is container implementation specific may be declared without any servlet-class or filter-class elements, respectively, and will be represented as preliminary Registration objects. Preliminary registrations must be completed by calling one of the addServlet or addFilter methods on ServletContext, and passing in the Servlet or Filter name (obtained via getName()) along with the supporting Servlet or Filter implementation class name, Class object, or instance, respectively. In most cases, preliminary registrations will be completed by an appropriate, container-provided ServletContainerInitializer.

Since:

Servlet 3.0

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	Registration.Dynamic	Interface through which a Servlet or Filter registered via one of the addServlet or addFilter methods, respectively, on ServletContext may be further configured.

Method Summary

Modifier and Type	Method	Description
String	getClassName()	Gets the fully qualified class name of the Servlet or Filter that is represented by this Registration.
String	getInitParameter(String name)	Gets the value of the initialization parameter with the given name that will be used to initialize the Servlet or Filter represented by this Registration object.
Map<String,String>	getInitParameters()	Gets an immutable (and possibly empty) Map containing the currently available initialization parameters that will be used to initialize the Servlet or Filter represented by this Registration object.
String	getName()	Gets the name of the Servlet or Filter that is represented by this Registration.
boolean	setInitParameter(String name, String value)	Sets the initialization parameter with the given name and value on the Servlet or Filter that is represented by this Registration.
Set<String>	setInitParameters(Map<String,String> initParameters)	Sets the given initialization parameters on the Servlet or Filter that is represented by this Registration.

Method Details

getName

String getName()

Gets the name of the Servlet or Filter that is represented by this Registration.

Returns:

the name of the Servlet or Filter that is represented by this Registration

getClassName

String getClassName()

Gets the fully qualified class name of the Servlet or Filter that is represented by this Registration.

Returns:

the fully qualified class name of the Servlet or Filter that is represented by this Registration, or null if this Registration is preliminary

setInitParameter

boolean setInitParameter(String name,
 String value)

Sets the initialization parameter with the given name and value on the Servlet or Filter that is represented by this Registration.

Parameters:

name - the initialization parameter name

value - the initialization parameter value

Returns:

true if the update was successful, i.e., an initialization parameter with the given name did not already exist for the Servlet or Filter represented by this Registration, and false otherwise

Throws:

IllegalStateException - if the ServletContext from which this Registration was obtained has already been initialized

IllegalArgumentException - if the given name or value is null

getInitParameter

String getInitParameter(String name)

Gets the value of the initialization parameter with the given name that will be used to initialize the Servlet or Filter represented by this Registration object.

Parameters:

name - the name of the initialization parameter whose value is requested

Returns:

the value of the initialization parameter with the given name, or null if no initialization parameter with the given name exists

setInitParameters

Set<String> setInitParameters(Map<String,String> initParameters)

Sets the given initialization parameters on the Servlet or Filter that is represented by this Registration.

The given map of initialization parameters is processed by-value, i.e., for each initialization parameter contained in the map, this method calls setInitParameter(String,String). If that method would return false for any of the initialization parameters in the given map, no updates will be performed, and false will be returned. Likewise, if the map contains an initialization parameter with a null name or value, no updates will be performed, and an IllegalArgumentException will be thrown.

The returned set is not backed by the Registration object, so changes in the returned set are not reflected in the Registration object, and vice-versa.

Parameters:

initParameters - the initialization parameters

Returns:

the (possibly empty) Set of initialization parameter names that are in conflict

Throws:

IllegalStateException - if the ServletContext from which this Registration was obtained has already been initialized

IllegalArgumentException - if the given map contains an initialization parameter with a null name or value

getInitParameters

Map<String,String> getInitParameters()

Gets an immutable (and possibly empty) Map containing the currently available initialization parameters that will be used to initialize the Servlet or Filter represented by this Registration object.

Returns:

Map containing the currently available initialization parameters that will be used to initialize the Servlet or Filter represented by this Registration object