org.apache.bsf.util

Class BSFEngineImpl

java.lang.Object
- org.apache.bsf.util.BSFEngineImpl

Implemented Interfaces:: BSFEngine, java.beans.PropertyChangeListener

Known Direct Subclasses:: JavaScriptEngine, JythonEngine, XSLTEngine

public abstract class BSFEngineImpl

extends java.lang.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.

Authors:: Sanjiva Weerawarana; Olivier Gruber (added original debugging support)

Field Summary
`protected java.lang.ClassLoader`	`classLoader`
`protected java.lang.String`	`classPath`
`protected java.util.Vector`	`declaredBeans`
`protected java.lang.String`	`lang`
`protected BSFManager`	`mgr`
`protected java.lang.String`	`tempDir`

Method Summary
`java.lang.Object`	`apply(java.lang.String source, int lineNo, int columnNo, java.lang.Object funcBody, java.util.Vector paramNames, java.util.Vector arguments)` Default impl of apply - calls eval ignoring parameters and returns the result.
`void`	`compileApply(java.lang.String source, int lineNo, int columnNo, java.lang.Object funcBody, java.util.Vector paramNames, java.util.Vector arguments, CodeBuffer cb)` Default impl of compileApply - calls compileExpr ignoring parameters.
`void`	`compileExpr(java.lang.String source, int lineNo, int columnNo, java.lang.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(java.lang.String source, int lineNo, int columnNo, java.lang.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(java.lang.String source, int lineNo, int columnNo, java.lang.Object script)` Default impl of execute - calls eval and ignores the result.
`void`	`iexec(java.lang.String source, int lineNo, int columnNo, java.lang.Object script)` Default impl of interactive execution - calls eval and ignores the result.
`void`	`initialize(BSFManager mgr, java.lang.String lang, java.util.Vector declaredBeans)` initialize the engine; called right after construction by the manager.
`void`	`propertyChange(java.beans.PropertyChangeEvent e)` Receive property change events from the manager and update my fields as needed.
`void`	`terminate()`
`void`	`undeclareBean(BSFDeclaredBean bean)`

classLoader

protected java.lang.ClassLoader classLoader

classPath

protected java.lang.String classPath

declaredBeans

protected java.util.Vector declaredBeans

lang

protected java.lang.String lang

mgr

protected BSFManager mgr

tempDir

protected java.lang.String tempDir

apply

public java.lang.Object apply(java.lang.String source,
                              int lineNo,
                              int columnNo,
                              java.lang.Object funcBody,
                              java.util.Vector paramNames,
                              java.util.Vector arguments)
            throws BSFException

Default impl of apply - calls eval ignoring parameters and returns the result.
Specified by:
apply in interface BSFEngine

compileApply

public void compileApply(java.lang.String source,
                         int lineNo,
                         int columnNo,
                         java.lang.Object funcBody,
                         java.util.Vector paramNames,
                         java.util.Vector arguments,
                         CodeBuffer cb)
            throws BSFException

Default impl of compileApply - calls compileExpr ignoring parameters.
Specified by:
compileApply in interface BSFEngine

compileExpr

public void compileExpr(java.lang.String source,
                        int lineNo,
                        int columnNo,
                        java.lang.Object expr,
                        CodeBuffer cb)
            throws BSFException

Default impl of compileExpr - generates code that'll create a new manager, evaluate the expression, and return the value.
Specified by:
compileExpr in interface BSFEngine

compileScript

public void compileScript(java.lang.String source,
                          int lineNo,
                          int columnNo,
                          java.lang.Object script,
                          CodeBuffer cb)
            throws BSFException

Default impl of compileScript - generates code that'll create a new manager, and execute the script.
Specified by:
compileScript in interface BSFEngine

declareBean

public void declareBean(BSFDeclaredBean bean)
            throws BSFException

Specified by:
declareBean in interface BSFEngine

exec

public void exec(java.lang.String source,
                 int lineNo,
                 int columnNo,
                 java.lang.Object script)
            throws BSFException

Default impl of execute - calls eval and ignores the result.
Specified by:
exec in interface BSFEngine

iexec

public void iexec(java.lang.String source,
                  int lineNo,
                  int columnNo,
                  java.lang.Object script)
            throws BSFException

Default impl of interactive execution - calls eval and ignores the result.
Specified by:
iexec in interface BSFEngine

initialize

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

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.
Specified by:
initialize in interface BSFEngine

propertyChange

public void propertyChange(java.beans.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()

Specified by:
terminate in interface BSFEngine

undeclareBean

public void undeclareBean(BSFDeclaredBean bean)
            throws BSFException

Specified by:
undeclareBean in interface BSFEngine

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