TreeNode.java example

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WaveInCloud-master
/**
 * Copyright 2010 Google Inc.
 *
 * 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,
 * WITHOUTreeNode 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.waveprotocol.wave.client.paging;

/**
 * A node in a tree. The types are intended to be covariant and homogenous.
 *
 * Note: the only reason this is not done with generic covariance ({@code
 * TreeNode<T extends TreeNode<T>>} is because GWT does not support
 * generic JSOs yet.
 *
 */
public interface TreeNode {

  /** @return the first child of this block. */
  TreeNode getFirstChild();

  /** @return the last child of this block. */
  TreeNode getLastChild();

  /** @return the next sibling of this block. */
  TreeNode getNextSibling();

  /** @return the previous sibling of this block. */
  TreeNode getPreviousSibling();

  /** @return the parent of this block. */
  TreeNode getParent();
}