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Java Source Code / Java Documentation » Scripting » beanshell » javax.script

Source Cross Reference Class Diagram Java Document (Java Doc)

javax.script .ScriptContext

All known Subclasses:   javax.script .SimpleScriptContext,
ScriptContext
public interface ScriptContext (Code)
The interface whose implementing classes are used to connect Script Engines with objects, such as scoped Bindings, in hosting applications. Each scope is a set of named attributes whose values can be set and retrieved using the ScriptContext methods. ScriptContexts also expose Readers and Writers that can be used by the ScriptEngines for input and output.
author:
   Mike Grogan
version:
   1.0
since:
   1.6

Field Summary
final public static int ENGINE_SCOPE
     EngineScope attributes are visible during the lifetime of a single ScriptEngine and a set of attributes is maintained for each engine.
final public static int GLOBAL_SCOPE
     GlobalScope attributes are visible to all engines created by same ScriptEngineFactory.

Method Summary
public Object getAttribute(String name, int scope)
     Gets the value of an attribute in a given scope.
Parameters:
  name - The name of the attribute to retrieve.
Parameters:
  scope - The scope in which to retrieve the attribute.
public Object getAttribute(String name)
     Retrieves the value of the attribute with the given name in the scope occurring earliest in the search order.
public int getAttributesScope(String name)
     Get the lowest scope in which an attribute is defined.
Parameters:
  name - Name of the attribute.
public Bindings getBindings(int scope)
     Gets the Bindings associated with the given scope in this ScriptContext. The associated Bindings.
public Writer getErrorWriter()
     Returns the Writer used to display error output.
public Reader getReader()
     Returns a Reader to be used by the script to read input.
public List<Integer> getScopes()
     Returns immutable List of all the valid values for scope in the ScriptContext.
public Writer getWriter()
     Returns the Writer for scripts to use when displaying output.
public Object removeAttribute(String name, int scope)
     Remove an attribute in a given scope.
Parameters:
  name - The name of the attribute to remove
Parameters:
  scope - The scope in which to remove the attribute The removed value.
public void setAttribute(String name, Object value, int scope)
     Sets the value of an attribute in a given scope.
Parameters:
  name - The name of the attribute to set.
Parameters:
  scope - The scope in which to set the attribute IllegalArgumentException if the scopeis invalid.
public void setBindings(Bindings bindings, int scope)
     Associates a Bindings instance with a particular scope in this ScriptContext.
public void setErrorWriter(Writer writer)
     Sets the Writer used to display error output.
public void setReader(Reader reader)
     Sets the Reader for scripts to read input .
public void setWriter(Writer writer)
     Sets the Writer for scripts to use when displaying output.

Field Detail
ENGINE_SCOPE
final public static int ENGINE_SCOPE(Code)
EngineScope attributes are visible during the lifetime of a single ScriptEngine and a set of attributes is maintained for each engine.

GLOBAL_SCOPE
final public static int GLOBAL_SCOPE(Code)
GlobalScope attributes are visible to all engines created by same ScriptEngineFactory.

Method Detail
getAttribute
public Object getAttribute(String name, int scope)(Code)
Gets the value of an attribute in a given scope.
Parameters:
  name - The name of the attribute to retrieve.
Parameters:
  scope - The scope in which to retrieve the attribute. The value of the attribute. Returns null is the namedoes not exist in the given scope. IllegalArgumentException if the value of scope is invalid. NullPointerException if the name is null.

getAttribute
public Object getAttribute(String name)(Code)
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.)
Parameters:
  name - The name of the the attribute to retrieve. The value of the attribute in the lowest scope forwhich an attribute with the given name is defined. Returnsnull if no attribute with the name exists in any scope. NullPointerException if the name is null.

getAttributesScope
public int getAttributesScope(String name)(Code)
Get the lowest scope in which an attribute is defined.
Parameters:
  name - Name of the attribute. The lowest scope. Returns -1 if no attribute with the givenname is defined in any scope.

getBindings
public Bindings getBindings(int scope)(Code)
Gets the Bindings associated with the given scope in this ScriptContext. The associated Bindings. Returns null if it has notbeen set.
throws:
  IllegalArgumentException - If no Bindings is defined for thespecified scope value in ScriptContext of this type.

getErrorWriter
public Writer getErrorWriter()(Code)
Returns the Writer used to display error output. The Writer

getReader
public Reader getReader()(Code)
Returns a Reader to be used by the script to read input. The Reader.

getScopes
public List<Integer> getScopes()(Code)
Returns immutable List of all the valid values for scope in the ScriptContext. list of scope values

getWriter
public Writer getWriter()(Code)
Returns the Writer for scripts to use when displaying output. The Writer.

removeAttribute
public Object removeAttribute(String name, int scope)(Code)
Remove an attribute in a given scope.
Parameters:
  name - The name of the attribute to remove
Parameters:
  scope - The scope in which to remove the attribute The removed value. IllegalArgumentException if the scope is invalid. NullPointerException if the name is null.

setAttribute
public void setAttribute(String name, Object value, int scope)(Code)
Sets the value of an attribute in a given scope.
Parameters:
  name - The name of the attribute to set.
Parameters:
  scope - The scope in which to set the attribute IllegalArgumentException if the scopeis invalid. NullPointerException if the name is null. ClassCastException if the name is not a String.

setBindings
public void setBindings(Bindings bindings, int scope)(Code)
Associates a Bindings instance with a particular scope in this ScriptContext. Calls to the getAttribute and setAttribute methods must map to the put and get methods of the Bindings for the specified scope.
Parameters:
  bindings - The Bindings to associate with the given scope
Parameters:
  scope - The scope IllegalArgumentException If no Bindings is defined for thespecified scope value in ScriptContexts of this type. NullPointerException if value of scope is ENGINE_SCOPE andthe specified Bindings is null.

setErrorWriter
public void setErrorWriter(Writer writer)(Code)
Sets the Writer used to display error output.
Parameters:
  writer - The Writer.

setReader
public void setReader(Reader reader)(Code)
Sets the Reader for scripts to read input .
Parameters:
  reader - The new Reader.

setWriter
public void setWriter(Writer writer)(Code)
Sets the Writer for scripts to use when displaying output.
Parameters:
  writer - The new Writer.

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