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Java Source Code / Java Documentation » Scripting » beanshell » bsh

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

bsh .CallStack

CallStack

public class CallStack (Code)

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.

Constructor Summary
public	CallStack()
public	CallStack(NameSpace namespace)

Method Summary
public void	clear()
public CallStack	copy() Occasionally we need to freeze the callstack for error reporting purposes, etc.
public int	depth()
public NameSpace	get(int depth) zero based.
public NameSpace	pop()
public void	push(NameSpace ns)
public void	set(int depth, NameSpace ns) This is kind of crazy, but used by the setNameSpace command.
public NameSpace	swap(NameSpace newTop) Swap in the value as the new top of the stack and return the old value.
public NameSpace[]	toArray()
public String	toString()
public NameSpace	top()

Constructor Detail

CallStack
public CallStack()(Code)

CallStack
public CallStack(NameSpace namespace)(Code)

Method Detail

clear
public void clear()(Code)

copy
public CallStack copy()(Code)
	Occasionally we need to freeze the callstack for error reporting purposes, etc.

depth
public int depth()(Code)

get
public NameSpace get(int depth)(Code)
	zero based.

pop
public NameSpace pop()(Code)

push
public void push(NameSpace ns)(Code)

set
public void set(int depth, NameSpace ns)(Code)
	This is kind of crazy, but used by the setNameSpace command. zero based.

swap
public NameSpace swap(NameSpace newTop)(Code)
	Swap in the value as the new top of the stack and return the old value.

toArray
public NameSpace[] toArray()(Code)

toString
public String toString()(Code)

top
public NameSpace top()(Code)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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