javax.script
Class SimpleScriptContext

java.lang.Object
  javax.script.SimpleScriptContext

All Implemented Interfaces:

ScriptContext

public class SimpleScriptContext
extends java.lang.Object
implements ScriptContext

The GenericScriptContext is a simple implementation of ScriptContext.

Author:

Nandika Jayawardana , Sanka Samaranayake

Field Summary

Fields inherited from interface javax.script.ScriptContext

ENGINE_SCOPE, GLOBAL_SCOPE

Constructor Summary

SimpleScriptContext()
Create a simple script context

Method Summary

java.lang.Object	getAttribute(java.lang.String name) Retrieves the value for getAttribute(String, int) for the lowest scope in which it returns a non-null value.
java.lang.Object	getAttribute(java.lang.String name, int scope) Retrieves the value associated with specified name in the specified level of scope.
int	getAttributesScope(java.lang.String name) Retrieves the lowest value of scopes for which the attribute is defined.
Bindings	getBindings(int scope) Retrieves the Namespace instance associated with the specified level of scope.
java.io.Writer	getErrorWriter() Returns the Writer used to display error output.
java.io.Reader	getReader() Returns a Reader to be used by the script to read input.
java.util.List	getScopes() Returns immutable List of all the valid values for scope in the ScriptContext.
java.io.Writer	getWriter() Returns the Writer for scripts to use when displaying output.
java.lang.Object	removeAttribute(java.lang.String name, int scope) Removes the specified attribute form the specified level of scope.
void	setAttribute(java.lang.String name, java.lang.Object value, int scope) Sets an attribute specified by the name in specified level of scope.
void	setBindings(Bindings namespace, int scope) Associates the specified namespace with specified level of scope.
void	setErrorWriter(java.io.Writer writer) Sets the Writer used to display error output.
void	setReader(java.io.Reader reader) Sets the Reader for scripts to read input .
void	setWriter(java.io.Writer writer) Sets the Writer for scripts to use when displaying output.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleScriptContext

public SimpleScriptContext()

Create a simple script context

Method Detail

getAttribute

public java.lang.Object getAttribute(java.lang.String name)
                              throws java.lang.IllegalArgumentException

Retrieves the value for getAttribute(String, int) for the lowest scope in which it returns a non-null value.

Specified by:

getAttribute in interface ScriptContext

Parameters:

name - the name of the attribute

Returns:

the value of the attribute

Throws:

java.lang.IllegalArgumentException

getAttribute

public java.lang.Object getAttribute(java.lang.String name,
                                     int scope)
                              throws java.lang.IllegalArgumentException

Retrieves the value associated with specified name in the specified level of scope. Returns null if no value is associated with specified key in specified level of scope.

Specified by:

getAttribute in interface ScriptContext

Parameters:

name - the name of the attribute

scope - the level of scope

Returns:

the value value associated with the specified name in specified level of scope

Throws:

java.lang.IllegalArgumentException

getAttributesScope

public int getAttributesScope(java.lang.String name)

Retrieves the lowest value of scopes for which the attribute is defined. If there is no associate scope with the given attribute (-1) is returned.

Specified by:

getAttributesScope in interface ScriptContext

Parameters:

name - the name of attribute

Returns:

the value of level of scope

getBindings

public Bindings getBindings(int scope)

Retrieves the Namespace instance associated with the specified level of scope.

Specified by:

getBindings in interface ScriptContext

Parameters:

scope - the level of the scope

Returns:

the namespace associated with the specified level of scope

removeAttribute

public java.lang.Object removeAttribute(java.lang.String name,
                                        int scope)
                                 throws java.lang.IllegalArgumentException

Removes the specified attribute form the specified level of scope.

Specified by:

removeAttribute in interface ScriptContext

Parameters:

name - the name of the attribute

scope - the level of scope

Returns:

value which is removed

Throws:

java.lang.IllegalArgumentException

setAttribute

public void setAttribute(java.lang.String name,
                         java.lang.Object value,
                         int scope)
                  throws java.lang.IllegalArgumentException

Sets an attribute specified by the name in specified level of scope.

Specified by:

setAttribute in interface ScriptContext

Parameters:

name - the name of the attribute

value - the value of the attribute

scope - the level of the scope

Throws:

java.lang.IllegalArgumentException - if the name is null scope is invalid

setBindings

public void setBindings(Bindings namespace,
                        int scope)
                 throws java.lang.IllegalArgumentException

Associates the specified namespace with specified level of scope.

Specified by:

setBindings in interface ScriptContext

Parameters:

namespace - the namespace to be associated with specified level of scope

scope - the level of scope

Throws:

java.lang.IllegalArgumentException

getScopes

public java.util.List 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

getErrorWriter

public java.io.Writer getErrorWriter()

Returns the Writer used to display error output.

Specified by:

getErrorWriter in interface ScriptContext

Returns:

The Writer

setErrorWriter

public void setErrorWriter(java.io.Writer writer)

Sets the Writer used to display error output.

Specified by:

setErrorWriter in interface ScriptContext

Parameters:

writer - The Writer.

getReader

public java.io.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(java.io.Reader reader)

Sets the Reader for scripts to read input .

Specified by:

setReader in interface ScriptContext

Parameters:

reader - The new Reader.

getWriter

public java.io.Writer getWriter()

Returns the Writer for scripts to use when displaying output.

Specified by:

getWriter in interface ScriptContext

Returns:

The Writer.

setWriter

public void setWriter(java.io.Writer writer)

Sets the Writer for scripts to use when displaying output.

Specified by:

setWriter in interface ScriptContext

Parameters:

writer - The new Writer.