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public class QueryTreeWalker<T>
The walking of the query tree. This class takes care of visiting
a tree resulting from parsing a query. As it traverses the tree
it calls appropriate methods of the visitor, set at the construction
time. The class uses a depth-first search, visiting all children
of a node, before visiting the node. The visit is done by calling
an appropriate method of the visitor. Typical code should match
the following pattern:
class MyVisitor implements QueryTreeVisitor {
...
}
class MyContext extends QueryTreeContext<MyContext> {
...
@Override
protected MyContext newChildContext() {
return new MyContext();
}
}
MyContext context = new MyContext();
QueryTreeWalker<MyContext> walker = new QueryTreeWalker<MyContext>(new MyVisitor());
Tree root = parser.query(queryStr);
walker.walk(root, context);
// retrieve whatever information you need from context
