org.eclipse.epsilon.egl.execute.context

Class EglFrameStackManager

java.lang.Object

org.eclipse.epsilon.egl.execute.context.EglFrameStackManager

public class EglFrameStackManager
extends Object

Manipulates a FrameStack to provide a slightly more sophisticated semantics for EGL. Specifically, the FrameStack is manipulated as follows when a template is to be executed:

1. The client calls prepareFrameStackFor(ExecutableTemplateSpecification) which ensures that the global variables of the parent template (if any) are accessible to the child, unless they are overwritten. variables of its parent, unless they are overwritten. Note that ExecutableTemplateSpecification.addVariablesTo(FrameStack) is called at this point to initialise any template-specific variables, such as out (the template-specific global output buffer variable).
2. The FrameStack is now setup for the specified template, and the client executes the template.
3. The client calls restoreFrameStackToPreviousState() to restore the previous set of global variables to the FrameStack. Any global variables created for the this template are cleared. The FrameStack is now setup for executing the parent template, which continues to execute.

Constructor Summary

Constructors

Constructor and Description
EglFrameStackManager(FrameStack frameStack)

Method Summary

Modifier and Type	Method and Description
void	prepareFrameStackFor(ExecutableTemplateSpecification spec)
void	restoreFrameStackToPreviousState()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EglFrameStackManager

public EglFrameStackManager(FrameStack frameStack)

Method Detail

prepareFrameStackFor

public void prepareFrameStackFor(ExecutableTemplateSpecification spec)

restoreFrameStackToPreviousState

public void restoreFrameStackToPreviousState()