/*
* Copyright (C) 2012 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.errai.ui.shared;
import com.google.gwt.dom.client.Element;
/**
* Visit the DOM
*
* @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
*
*/
public class Visit {
public static <T> VisitContext<T> depthFirst(Element root, Visitor<T> visitor) {
if (root == null)
throw new IllegalArgumentException("Root Element to visit must not be null.");
return depthFirst(new VisitContextImpl<T>(), root, visitor);
}
private static <T> VisitContext<T> depthFirst(VisitContextImpl<T> context, Element root, Visitor<T> visitor) {
Element current = root;
// If visit returns false, stop visiting down (but keep visiting)
if (visitor.visit(context, current)) {
current = current.getFirstChildElement();
while (current != null && !context.isVisitComplete()) {
depthFirst(context, current, visitor);
current = current.getNextSiblingElement();
}
}
return context;
}
}