org.apache.bsf.engines.javascript
Class JavaScriptEngine

java.lang.Object
  org.apache.bsf.util.BSFEngineImpl
      org.apache.bsf.engines.javascript.JavaScriptEngine

All Implemented Interfaces:

BSFEngine, java.util.EventListener, java.beans.PropertyChangeListener

public class JavaScriptEngine

extends BSFEngineImpl

This is the interface to Netscape's Rhino (JavaScript) from the Bean Scripting Framework.

The original version of this code was first written by Adam Peller for use in LotusXSL. Sanjiva took his code and adapted it for BSF.

Author:

Adam Peller , Sanjiva Weerawarana, Matthew J. Duftler, Norris Boyd

Field Summary

Fields inherited from class org.apache.bsf.util.BSFEngineImpl

classLoader, classPath, declaredBeans, lang, mgr, tempDir

Constructor Summary

JavaScriptEngine()

Method Summary

java.lang.Object	call(java.lang.Object object, java.lang.String method, java.lang.Object[] args) Return an object from an extension.
void	declareBean(BSFDeclaredBean bean) Declare a bean after the engine has been started.
java.lang.Object	eval(java.lang.String source, int lineNo, int columnNo, java.lang.Object oscript) This is used by an application to evaluate a string containing some expression.
void	initialize(BSFManager mgr, java.lang.String lang, java.util.Vector declaredBeans) Initialize the engine.
void	undeclareBean(BSFDeclaredBean bean) Undeclare a previously declared bean.

Methods inherited from class org.apache.bsf.util.BSFEngineImpl

apply, compileApply, compileExpr, compileScript, exec, iexec, propertyChange, terminate

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaScriptEngine

public JavaScriptEngine()

Method Detail

call

public java.lang.Object call(java.lang.Object object,
                             java.lang.String method,
                             java.lang.Object[] args)
                      throws BSFException

Return an object from an extension.

Parameters:

object - Object on which to make the call (ignored).

method - The name of the method to call.

args - an array of arguments to be passed to the extension, which may be either Vectors of Nodes, or Strings.

Throws:

BSFException - if anything goes wrong while eval'ing a BSFException is thrown. The reason indicates the problem.

declareBean

public void declareBean(BSFDeclaredBean bean)
                 throws BSFException

Description copied from interface: BSFEngine

Declare a bean after the engine has been started. Declared beans are beans that are named and which the engine must make available to the scripts it runs in the most first class way possible.

Specified by:

declareBean in interface BSFEngine

Overrides:

declareBean in class BSFEngineImpl

Throws:

BSFException

eval

public java.lang.Object eval(java.lang.String source,
                             int lineNo,
                             int columnNo,
                             java.lang.Object oscript)
                      throws BSFException

This is used by an application to evaluate a string containing some expression.

Parameters:

source - (context info) the source of this expression (e.g., filename)

lineNo - (context info) the line number in source for expr

columnNo - (context info) the column number in source for expr

oscript - the expression to evaluate

Throws:

BSFException - if anything goes wrong while eval'ing a BSFException is thrown. The reason indicates the problem.

initialize

public void initialize(BSFManager mgr,
                       java.lang.String lang,
                       java.util.Vector declaredBeans)
                throws BSFException

Initialize the engine. Put the manager into the context-manager map hashtable too.

Specified by:

initialize in interface BSFEngine

Overrides:

initialize in class BSFEngineImpl

Throws:

BSFException

undeclareBean

public void undeclareBean(BSFDeclaredBean bean)
                   throws BSFException

Description copied from interface: BSFEngine

Undeclare a previously declared bean.

Specified by:

undeclareBean in interface BSFEngine

Overrides:

undeclareBean in class BSFEngineImpl

Throws:

BSFException