Retrieves the value of the attribute with the given name in the scope occurring earliest in the search order.

  Retrieves the value of the attribute with the given name in
the scope occurring earliest in the search order. The order
is determined by the numeric value of the scope parameter (lowest
scope values first.)
Returns: The value of the attribute in the lowest scope for which an attribute with the given name is defined. Returns null if no attribute with the name exists in any scope.
Parameters:
- name - The name of the the attribute to retrieve.
Throws:
- NullPointerException - if the name is null.
- IllegalArgumentException - if the name is empty.

  Gets the value of an attribute in a given scope.

  Gets the value of an attribute in a given scope.
Returns: The value of the attribute. Returns null is the name does not exist in the given scope.
Parameters:
- name - The name of the attribute to retrieve.
- scope - The scope in which to retrieve the attribute.
Throws:
- IllegalArgumentException - if the name is empty or if the value of scope is invalid.
- NullPointerException - if the name is null.

  Get the lowest scope in which an attribute is defined.

  Get the lowest scope in which an attribute is defined.
Returns: The lowest scope. Returns -1 if no attribute with the given name is defined in any scope.
Parameters:
- name - Name of the attribute .
Throws:
- NullPointerException - if name is null.
- IllegalArgumentException - if name is empty.

  Returns the value of the engineScope field if specified scope is ENGINE_SCOPE.

  Returns the value of the engineScope field if specified scope is
ENGINE_SCOPE. Returns the value of the globalScope field if the specified scope is
GLOBAL_SCOPE.
Returns: The value of either the engineScope or globalScope field.
Parameters:
- scope - The specified scope
Throws:
- IllegalArgumentException - if the value of scope is invalid.

Returns the Writer used to display error output.

Returns a Reader to be used by the script to read input.

Returns immutable List of all the valid values for scope in the ScriptContext.

Returns the Writer for scripts to use when displaying output.

  Remove an attribute in a given scope.

  Remove an attribute in a given scope.
Returns: The removed value.
Parameters:
- name - The name of the attribute to remove
- scope - The scope in which to remove the attribute
Throws:
- IllegalArgumentException - if the name is empty or if the scope is invalid.
- NullPointerException - if the name is null.

  Sets the value of an attribute in a given scope.

  Sets the value of an attribute in a given scope.
Parameters:
- name - The name of the attribute to set
- value - The value of the attribute
- scope - The scope in which to set the attribute
Throws:
- IllegalArgumentException - if the name is empty or if the scope is invalid.
- NullPointerException - if the name is null.

  Sets a Bindings of attributes for the given scope.

  Sets a Bindings of attributes for the given scope. If the value
of scope is ENGINE_SCOPE the given Bindings replaces the
engineScope field. If the value
of scope is GLOBAL_SCOPE the given Bindings replaces the
globalScope field.
Parameters:
- bindings - The Bindings of attributes to set.
- scope - The value of the scope in which the attributes are set.
Throws:
- IllegalArgumentException - if scope is invalid.
- NullPointerException - if the value of scope is ENGINE_SCOPE and the specified Bindings is null.

Sets the Writer used to display error output.

Sets the Reader for scripts to read input .

Sets the Writer for scripts to use when displaying output.