[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.net; |
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| 19 | |
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| 20 | /** A base class that implements interface Node |
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| 21 | * |
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| 22 | */ |
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| 23 | |
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| 24 | public class NodeBase implements Node { |
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| 25 | public final static char PATH_SEPARATOR = '/'; |
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| 26 | public final static String PATH_SEPARATOR_STR = "/"; |
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| 27 | public final static String ROOT = ""; // string representation of root |
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| 28 | |
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| 29 | protected String name; //host:port# |
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| 30 | protected String location; //string representation of this node's location |
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| 31 | protected int level; //which level of the tree the node resides |
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| 32 | protected Node parent; //its parent |
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| 33 | |
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| 34 | /** Default constructor */ |
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| 35 | public NodeBase() { |
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| 36 | } |
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| 37 | |
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| 38 | /** Construct a node from its path |
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| 39 | * @param path |
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| 40 | * a concatenation of this node's location, the path seperator, and its name |
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| 41 | */ |
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| 42 | public NodeBase(String path) { |
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| 43 | path = normalize(path); |
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| 44 | int index = path.lastIndexOf(PATH_SEPARATOR); |
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| 45 | if (index== -1) { |
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| 46 | set(ROOT, path); |
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| 47 | } else { |
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| 48 | set(path.substring(index+1), path.substring(0, index)); |
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| 49 | } |
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| 50 | } |
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| 51 | |
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| 52 | /** Construct a node from its name and its location |
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| 53 | * @param name this node's name |
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| 54 | * @param location this node's location |
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| 55 | */ |
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| 56 | public NodeBase(String name, String location) { |
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| 57 | set(name, normalize(location)); |
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| 58 | } |
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| 59 | |
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| 60 | /** Construct a node from its name and its location |
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| 61 | * @param name this node's name |
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| 62 | * @param location this node's location |
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| 63 | * @param parent this node's parent node |
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| 64 | * @param level this node's level in the tree |
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| 65 | */ |
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| 66 | public NodeBase(String name, String location, Node parent, int level) { |
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| 67 | set(name, normalize(location)); |
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| 68 | this.parent = parent; |
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| 69 | this.level = level; |
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| 70 | } |
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| 71 | |
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| 72 | /* set this node's name and location */ |
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| 73 | private void set(String name, String location) { |
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| 74 | if (name != null && name.contains(PATH_SEPARATOR_STR)) |
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| 75 | throw new IllegalArgumentException( |
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| 76 | "Network location name contains /: "+name); |
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| 77 | this.name = (name==null)?"":name; |
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| 78 | this.location = location; |
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| 79 | } |
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| 80 | |
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| 81 | /** Return this node's name */ |
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| 82 | public String getName() { return name; } |
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| 83 | |
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| 84 | /** Return this node's network location */ |
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| 85 | public String getNetworkLocation() { return location; } |
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| 86 | |
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| 87 | /** Set this node's network location */ |
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| 88 | public void setNetworkLocation(String location) { this.location = location; } |
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| 89 | |
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| 90 | /** Return this node's path */ |
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| 91 | public static String getPath(Node node) { |
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| 92 | return node.getNetworkLocation()+PATH_SEPARATOR_STR+node.getName(); |
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| 93 | } |
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| 94 | |
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| 95 | /** Return this node's string representation */ |
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| 96 | public String toString() { |
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| 97 | return getPath(this); |
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| 98 | } |
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| 99 | |
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| 100 | /** Normalize a path */ |
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| 101 | static public String normalize(String path) { |
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| 102 | if (path == null || path.length() == 0) return ROOT; |
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| 103 | |
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| 104 | if (path.charAt(0) != PATH_SEPARATOR) { |
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| 105 | throw new IllegalArgumentException( |
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| 106 | "Network Location path does not start with " |
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| 107 | +PATH_SEPARATOR_STR+ ": "+path); |
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| 108 | } |
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| 109 | |
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| 110 | int len = path.length(); |
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| 111 | if (path.charAt(len-1) == PATH_SEPARATOR) { |
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| 112 | return path.substring(0, len-1); |
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| 113 | } |
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| 114 | return path; |
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| 115 | } |
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| 116 | |
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| 117 | /** Return this node's parent */ |
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| 118 | public Node getParent() { return parent; } |
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| 119 | |
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| 120 | /** Set this node's parent */ |
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| 121 | public void setParent(Node parent) { |
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| 122 | this.parent = parent; |
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| 123 | } |
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| 124 | |
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| 125 | /** Return this node's level in the tree. |
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| 126 | * E.g. the root of a tree returns 0 and its children return 1 |
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| 127 | */ |
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| 128 | public int getLevel() { return level; } |
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| 129 | |
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| 130 | /** Set this node's level in the tree */ |
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| 131 | public void setLevel(int level) { |
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| 132 | this.level = level; |
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| 133 | } |
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| 134 | } |
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