T - the context used by the visitorpublic class QueryTreeWalker<T extends QueryTreeContext<T>>
extends java.lang.Object
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
| Constructor and Description |
|---|
QueryTreeWalker(QueryTreeVisitor<T> visitor)
Creates a new query walker that calls the given
visitor. |
public QueryTreeWalker(QueryTreeVisitor<T> visitor)
visitor.visitor - the visitor to be called by this walkerpublic void walk(Tree tree,
T context)
throws QueryTreeException
tree - the tree to be walkedcontext - the context in which the tree is walkedQueryTreeExceptionpublic static Tree simplify(Tree tree)