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/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/lib/Node.java

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Java | 43 lines | 6 code | 5 blank | 32 comment | 0 complexity | 43a94d599173d2691de9ce59257e7e3f MD5 | raw file
 1/**
 2 * Licensed to the Apache Software Foundation (ASF) under one
 3 * or more contributor license agreements.  See the NOTICE file
 4 * distributed with this work for additional information
 5 * regarding copyright ownership.  The ASF licenses this file
 6 * to you under the Apache License, Version 2.0 (the
 7 * "License"); you may not use this file except in compliance
 8 * with the License.  You may obtain a copy of the License at
 9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19package org.apache.hadoop.hive.ql.lib;
20
21import java.util.List;
22
23/**
24 * This interface defines the functions needed by the walkers and dispatchers.
25 * These are implemented by the node of the graph that needs to be walked.
26 */
27public interface Node {
28
29  /**
30   * Gets the vector of children nodes. This is used in the graph walker
31   * algorithms.
32   * 
33   * @return List<? extends Node>
34   */
35  List<? extends Node> getChildren();
36
37  /**
38   * Gets the name of the node. This is used in the rule dispatchers.
39   * 
40   * @return String
41   */
42  String getName();
43}