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/*
* Copyright (C) 2009-2011 Mathias Doenitz
*
* 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.parboiled.trees;
/**
* A specialization of a {@link GraphNode} that contains a reference to its parent, thereby making the graph a tree
* (since each node can now have only one parent node).
*
* @param the actual implementation type of this TreeNode
*/
public interface TreeNode> extends GraphNode {
/**
* Returns the parent node or null if this node is the root.
*
* @return the parent node
*/
T getParent();
}