src/cobalt/dom/node_children_iterator.h

/*
 * Copyright 2014 Google Inc. All Rights Reserved.
 *
 * 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.
 */

#ifndef COBALT_DOM_NODE_CHILDREN_ITERATOR_H_
#define COBALT_DOM_NODE_CHILDREN_ITERATOR_H_

#include "cobalt/dom/node.h"

namespace cobalt {
namespace dom {

// Iterates over the first-level children of the given node.
class NodeChildrenIterator {
 public:
  explicit NodeChildrenIterator(const scoped_refptr<const Node>& parent)
      : parent_(parent), current_(NULL) {}

  Node* First() {
    current_ = parent_->first_child();
    return current_;
  }

  Node* Next() {
    if (current_) {
      current_ = current_->next_sibling();
    }
    return current_;
  }

 private:
  scoped_refptr<const Node> parent_;
  // Scoped pointer is not used for optimization reasons.
  Node* current_;
};

}  // namespace dom
}  // namespace cobalt

#endif  // COBALT_DOM_NODE_CHILDREN_ITERATOR_H_