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Visitor interface for objects that visit each sub-expression of an Expression instance, performing some computation or data collection.
Method Summary | |
void |
down()
Callback to signal that the visitor has just descended a level in the Expression tree. |
void |
up()
Callback to signal that the visitor has just ascended a level in the Expression tree. |
void |
visitExpression(Expression expr)
Callback made when visiting a particular expression. |
Method Detail |
public void visitExpression(Expression expr)
expr
- the expression currently being visited.public void down()
public void up()
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