bsh
Class CallStack
public class CallStack
extends java.lang.Object
A stack of NameSpaces representing the call path.
Each method invocation, for example, pushes a new NameSpace onto the stack.
The top of the stack is always the current namespace of evaluation.
This is used to support the this.caller magic reference and to print
script "stack traces" when evaluation errors occur.
Note: it would be awefully nice to use the java.util.Stack here.
Sigh... have to stay 1.1 compatible.
Note: How can this be thread safe, you might ask? Wouldn't a thread
executing various beanshell methods be mutating the callstack? Don't we
need one CallStack per Thread in the interpreter? The answer is that we do.
Any java.lang.Thread enters our script via an external (hard) Java
reference via a This type interface, e.g. the Runnable interface
implemented by This or an arbitrary interface implemented by XThis.
In that case the This invokeMethod() method (called by any interface that
it exposes) creates a new CallStack for each external call.
CallStack
public CallStack()
CallStack
public CallStack(NameSpace namespace)
copy
public CallStack copy()
Occasionally we need to freeze the callstack for error reporting
purposes, etc.
get
public NameSpace get(int depth)
zero based.
set
public void set(int depth,
NameSpace ns)
This is kind of crazy, but used by the setNameSpace command.
zero based.
swap
public NameSpace swap(NameSpace newTop)
Swap in the value as the new top of the stack and return the old
value.
toString
public String toString()
B) 2000-2005 pat@pat.net :-)