org.apache.bsf.util

Class BSFEngineImpl

public abstract class BSFEngineImpl extends Object implements BSFEngine

This is a base implementation of the BSFEngine interface which engine implementations may choose to extend to get the basic methods of the interface implemented.

Author: Sanjiva Weerawarana Olivier Gruber (added original debugging support)

Field Summary
protected ClassLoader	classLoader
protected String	classPath
protected Vector	declaredBeans
protected String	lang
protected BSFManager	mgr
protected String	tempDir

Method Summary
Object	apply(String source, int lineNo, int columnNo, Object funcBody, Vector paramNames, Vector arguments) Default impl of apply - calls eval ignoring parameters and returns the result.
void	compileApply(String source, int lineNo, int columnNo, Object funcBody, Vector paramNames, Vector arguments, CodeBuffer cb) Default impl of compileApply - calls compileExpr ignoring parameters.
void	compileExpr(String source, int lineNo, int columnNo, Object expr, CodeBuffer cb) Default impl of compileExpr - generates code that'll create a new manager, evaluate the expression, and return the value.
void	compileScript(String source, int lineNo, int columnNo, Object script, CodeBuffer cb) Default impl of compileScript - generates code that'll create a new manager, and execute the script.
void	declareBean(BSFDeclaredBean bean)
void	exec(String source, int lineNo, int columnNo, Object script) Default impl of execute - calls eval and ignores the result.
void	iexec(String source, int lineNo, int columnNo, Object script) Default impl of interactive execution - calls eval and ignores the result.
void	initialize(BSFManager mgr, String lang, Vector declaredBeans) initialize the engine; called right after construction by the manager.
void	propertyChange(PropertyChangeEvent e) Receive property change events from the manager and update my fields as needed.
void	terminate()
void	undeclareBean(BSFDeclaredBean bean)

Field Detail

classLoader

protected ClassLoader classLoader

classPath

protected String classPath

declaredBeans

protected Vector declaredBeans

lang

protected String lang

mgr

protected BSFManager mgr

tempDir

protected String tempDir

Method Detail

apply

public Object apply(String source, int lineNo, int columnNo, Object funcBody, Vector paramNames, Vector arguments)

Default impl of apply - calls eval ignoring parameters and returns the result.

compileApply

public void compileApply(String source, int lineNo, int columnNo, Object funcBody, Vector paramNames, Vector arguments, CodeBuffer cb)

Default impl of compileApply - calls compileExpr ignoring parameters.

compileExpr

public void compileExpr(String source, int lineNo, int columnNo, Object expr, CodeBuffer cb)

Default impl of compileExpr - generates code that'll create a new manager, evaluate the expression, and return the value.

compileScript

public void compileScript(String source, int lineNo, int columnNo, Object script, CodeBuffer cb)

Default impl of compileScript - generates code that'll create a new manager, and execute the script.

declareBean

public void declareBean(BSFDeclaredBean bean)

exec

public void exec(String source, int lineNo, int columnNo, Object script)

Default impl of execute - calls eval and ignores the result.

iexec

public void iexec(String source, int lineNo, int columnNo, Object script)

Default impl of interactive execution - calls eval and ignores the result.

initialize

public void initialize(BSFManager mgr, String lang, Vector declaredBeans)

initialize the engine; called right after construction by the manager. Declared beans are simply kept in a vector and that's it. Subclasses must do whatever they want with it.

propertyChange

public void propertyChange(PropertyChangeEvent e)

Receive property change events from the manager and update my fields as needed.

Parameters: e PropertyChange event with the change data

terminate

public void terminate()

undeclareBean

public void undeclareBean(BSFDeclaredBean bean)