com.vaadin.flow.server

Class VaadinServletContext

java.lang.Object

com.vaadin.flow.server.VaadinServletContext

All Implemented Interfaces:

VaadinContext, Serializable

public class VaadinServletContext
extends Object
implements VaadinContext

VaadinContext that goes with VaadinServletService.

Since:

2.0.0

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
VaadinServletContext(javax.servlet.ServletContext context) Creates an instance of this context with given ServletContext.

Method Summary

Modifier and Type	Method and Description
<T> T	getAttribute(Class<T> type, Supplier<T> defaultValueSupplier) Returns value of the specified attribute, creating and storing a default value if attribute not present.
javax.servlet.ServletContext	getContext() Returns the underlying context.
String	getContextParameter(String name) Returns the value for the requested parameter, or null if the parameter does not exist.
Enumeration<String>	getContextParameterNames() Returns the names of the initialization parameters as an Enumeration, or an empty Enumeration if there are o initialization parameters.
void	removeAttribute(Class<?> clazz) Removes an attribute identified by the given type.
<T> void	setAttribute(Class<T> clazz, T value) Sets the attribute value for the give type, overriding previously existing one.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.flow.server.VaadinContext

getAttribute, setAttribute

Constructor Detail

VaadinServletContext

public VaadinServletContext(javax.servlet.ServletContext context)

Creates an instance of this context with given ServletContext.

Parameters:

context - the servlet context to use

Method Detail

getContext

public javax.servlet.ServletContext getContext()

Returns the underlying context.

Returns:

A non-null ServletContext.

getAttribute

public <T> T getAttribute(Class<T> type,
                          Supplier<T> defaultValueSupplier)

Description copied from interface: VaadinContext

Returns value of the specified attribute, creating and storing a default value if attribute not present.

If attribute is not yet available the defaultValueSupplier is used to get the default value which is set as the attribute value and the value is returned. The operation is executed atomically.

Specified by:

getAttribute in interface VaadinContext

Parameters:

type - Type of the attribute.

defaultValueSupplier - Supplier of the default value, called when there is no value already present. May be null.

Returns:

Value of the specified attribute.

setAttribute

public <T> void setAttribute(Class<T> clazz,
                             T value)

Description copied from interface: VaadinContext

Sets the attribute value for the give type, overriding previously existing one. Values are based on exact type, meaning only one attribute of given type is possible at any given time.

Specified by:

setAttribute in interface VaadinContext

Parameters:

clazz - the type to associate the value with, not null

value - the attribute value to set, or null to remove the current value

removeAttribute

public void removeAttribute(Class<?> clazz)

Description copied from interface: VaadinContext

Removes an attribute identified by the given type. If the attribute does not exist, no action will be taken.

Specified by:

removeAttribute in interface VaadinContext

Parameters:

clazz - Attribute type.

See Also:

for setting attributes.

getContextParameterNames

public Enumeration<String> getContextParameterNames()

Description copied from interface: VaadinContext

Returns the names of the initialization parameters as an Enumeration, or an empty Enumeration if there are o initialization parameters.

Specified by:

getContextParameterNames in interface VaadinContext

Returns:

initialization parameters as a Enumeration

getContextParameter

public String getContextParameter(String name)

Description copied from interface: VaadinContext

Returns the value for the requested parameter, or null if the parameter does not exist.

Specified by:

getContextParameter in interface VaadinContext

Parameters:

name - name of the parameter whose value is requested

Returns:

parameter value as String or null for no parameter