Class CallStack
java.lang.Object
bsh.CallStack
- All Implemented Interfaces:
Serializable
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: 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.
- See Also:
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
clear()
copy()
Occasionally we need to freeze the callstack for error reporting purposes, etc.int
depth()
get
(int depth) zero based.pop()
void
void
This is kind of crazy, but used by the setNameSpace command.Swap in the value as the new top of the stack and return the old value.top()
toString()
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Constructor Details
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CallStack
public CallStack() -
CallStack
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Method Details
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clear
public void clear() -
push
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top
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get
zero based. -
set
This is kind of crazy, but used by the setNameSpace command. zero based. -
pop
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swap
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depth
public int depth() -
toString
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copy
Occasionally we need to freeze the callstack for error reporting purposes, etc.
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