bsh
Class This

java.lang.Object
  |
  +--bsh.This
All Implemented Interfaces:
java.lang.Runnable, java.io.Serializable

public class This
extends java.lang.Object
implements java.io.Serializable, java.lang.Runnable

'This' is the type of bsh scripted objects. A 'This' object is a bsh scripted object context. It holds a namespace reference and implements event listeners and various other interfaces. This holds a reference to the declaring interpreter for callbacks from outside of bsh.

See Also:
Serialized Form

Constructor Summary
protected This(NameSpace namespace, Interpreter declaringInterpreter)
           
 
Method Summary
static void bind(This ths, NameSpace namespace, Interpreter declaringInterpreter)
          Bind a This reference to a parent's namespace with the specified declaring interpreter.
 java.lang.Object getInterface(java.lang.Class clas)
          Get a version of the interface.
 NameSpace getNameSpace()
           
 java.lang.Object invokeMethod(java.lang.String name, java.lang.Object[] args)
          Invoke specified method as from outside java code, using the declaring interpreter and current namespace.
 java.lang.Object invokeMethod(java.lang.String methodName, java.lang.Object[] args, Interpreter interpreter, CallStack callstack, bsh.SimpleNode callerInfo)
          Invoke a method in this namespace with the specified args, interpreter reference, callstack, and caller info.
 void run()
           
 java.lang.String toString()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

This

protected This(NameSpace namespace,
               Interpreter declaringInterpreter)
Method Detail

getInterface

public java.lang.Object getInterface(java.lang.Class clas)
                              throws UtilEvalError
Get a version of the interface. If this type of This implements it directly return this, else try complain that we don't have the proxy mechanism.

UtilEvalError

getNameSpace

public NameSpace getNameSpace()

toString

public java.lang.String toString()
Overrides:
toString in class java.lang.Object

run

public void run()
Specified by:
run in interface java.lang.Runnable

invokeMethod

public java.lang.Object invokeMethod(java.lang.String name,
                                     java.lang.Object[] args)
                              throws EvalError
Invoke specified method as from outside java code, using the declaring interpreter and current namespace. The call stack will indicate that the method is being invoked from outside of bsh in native java code. Note: you must still wrap/unwrap args/return values using Primitive/Primitive.unwrap() for use outside of BeanShell.

EvalError
See Also:
Primitive

invokeMethod

public java.lang.Object invokeMethod(java.lang.String methodName,
                                     java.lang.Object[] args,
                                     Interpreter interpreter,
                                     CallStack callstack,
                                     bsh.SimpleNode callerInfo)
                              throws EvalError
Invoke a method in this namespace with the specified args, interpreter reference, callstack, and caller info.

Note: If you use this method outside of the bsh package and wish to use variables with primitive values you will have to wrap them using bsh.Primitive. Consider using This getInterface() to make a true Java interface for invoking your scripted methods.

This method also implements the default object protocol of toString(), hashCode() and equals() and the invoke() meta-method handling as a last resort.

Note: the invoke() method will not catch the object method (toString, ...). If you want to override them you have to script them directly.

EvalError
See Also:
bsh.This.invokeMethod( String methodName, Object [] args, Interpreter interpreter, CallStack callstack, SimpleNode callerInfo ), Primitive

bind

public static void bind(This ths,
                        NameSpace namespace,
                        Interpreter declaringInterpreter)
Bind a This reference to a parent's namespace with the specified declaring interpreter. Also re-init the callstack. It's necessary to bind a This reference before it can be used after deserialization. This is used by the bsh load() command.

This is a static utility method because it's used by a bsh command bind() and the interpreter doesn't currently allow access to direct methods of This objects (small hack)



2000 pat@pat.net :-)