Field Detail

• writer

  protected Writer writer

  This is the writer to be used to output from scripts. By default, a PrintWriter based on System.out is used. Accessor methods getWriter, setWriter are used to manage this field.

  See Also:

  System.out, PrintWriter

• errorWriter

  protected Writer errorWriter

  This is the writer to be used to output errors from scripts. By default, a PrintWriter based on System.err is used. Accessor methods getErrorWriter, setErrorWriter are used to manage this field.

  See Also:

  System.err, PrintWriter

• reader

  protected Reader reader

  This is the reader to be used for input from scripts. By default, a InputStreamReader based on System.in is used and default charset is used by this reader. Accessor methods getReader, setReader are used to manage this field.

  See Also:

  System.in, InputStreamReader

• engineScope

  protected Bindings engineScope

  This is the engine scope bindings. By default, a SimpleBindings is used. Accessor methods setBindings, getBindings are used to manage this field.

  See Also:

  SimpleBindings

• globalScope

  protected Bindings globalScope

  This is the global scope bindings. By default, a null value (which means no global scope) is used. Accessor methods setBindings, getBindings are used to manage this field.

Constructor Detail

• SimpleScriptContext

  public SimpleScriptContext()

  Create a SimpleScriptContext.

Method Detail

• setBindings

  public void setBindings(Bindings bindings,
                          int 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.

  Specified by:

  setBindings in interface  ScriptContext

  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.

• getAttribute

  public Object getAttribute(String name)

  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.)

  Specified by:

  getAttribute in interface  ScriptContext

  Parameters:

  name - The name of the the attribute to retrieve.

  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.

  Throws:

  NullPointerException - if the name is null.

  IllegalArgumentException - if the name is empty.

• getAttribute

  public Object getAttribute(String name,
                             int scope)

  Gets the value of an attribute in a given scope.

  Specified by:

  getAttribute in interface  ScriptContext

  Parameters:

  name - The name of the attribute to retrieve.

  scope - The scope in which to retrieve the attribute.

  Returns:

  The value of the attribute. Returns null is the name does not exist in the given scope.

  Throws:

  IllegalArgumentException - if the name is empty or if the value of scope is invalid.

  NullPointerException - if the name is null.

• removeAttribute

  public Object removeAttribute(String name,
                                int scope)

  Remove an attribute in a given scope.

  Specified by:

  removeAttribute in interface  ScriptContext

  Parameters:

  name - The name of the attribute to remove

  scope - The scope in which to remove the attribute

  Returns:

  The removed value.

  Throws:

  IllegalArgumentException - if the name is empty or if the scope is invalid.

  NullPointerException - if the name is null.

• setAttribute

  public void setAttribute(String name,
                           Object value,
                           int scope)

  Sets the value of an attribute in a given scope.

  Specified by:

  setAttribute in interface  ScriptContext

  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.

• getWriter

  public Writer getWriter()

  Returns the Writer for scripts to use when displaying output.

  Specified by:

  getWriter in interface  ScriptContext

  Returns:

  The Writer.

• getReader

  public Reader getReader()

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

  Specified by:

  getReader in interface  ScriptContext

  Returns:

  The Reader.

• setReader

  public void setReader(Reader reader)

  Sets the Reader for scripts to read input .

  Specified by:

  setReader in interface  ScriptContext

  Parameters:

  reader - The new Reader.

• setWriter

  public void setWriter(Writer writer)

  Sets the Writer for scripts to use when displaying output.

  Specified by:

  setWriter in interface  ScriptContext

  Parameters:

  writer - The new Writer.

• getErrorWriter

  public Writer getErrorWriter()

  Returns the Writer used to display error output.

  Specified by:

  getErrorWriter in interface  ScriptContext

  Returns:

  The Writer

• setErrorWriter

  public void setErrorWriter(Writer writer)

  Sets the Writer used to display error output.

  Specified by:

  setErrorWriter in interface  ScriptContext

  Parameters:

  writer - The Writer.

• getAttributesScope

  public int getAttributesScope(String name)

  Get the lowest scope in which an attribute is defined.

  Specified by:

  getAttributesScope in interface  ScriptContext

  Parameters:

  name - Name of the attribute .

  Returns:

  The lowest scope. Returns -1 if no attribute with the given name is defined in any scope.

  Throws:

  NullPointerException - if name is null.

  IllegalArgumentException - if name is empty.

• getBindings

  public Bindings getBindings(int 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.

  Specified by:

  getBindings in interface  ScriptContext

  Parameters:

  scope - The specified scope

  Returns:

  The value of either the engineScope or globalScope field.

  Throws:

  IllegalArgumentException - if the value of scope is invalid.

• getScopes

  public List<Integer> getScopes()

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

  Specified by:

  getScopes in interface  ScriptContext

  Returns:

  list of scope values