Class VaadinServletContext

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