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<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.util;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>/**<a name="line.22"></a>
<span class="sourceLineNo">023</span> * Used to describe or modify the lexicographical sort order of a<a name="line.23"></a>
<span class="sourceLineNo">024</span> * {@code byte[]}. Default ordering is considered {@code ASCENDING}. The order<a name="line.24"></a>
<span class="sourceLineNo">025</span> * of a {@code byte[]} can be inverted, resulting in {@code DESCENDING} order,<a name="line.25"></a>
<span class="sourceLineNo">026</span> * by replacing each byte with its 1's compliment.<a name="line.26"></a>
<span class="sourceLineNo">027</span> */<a name="line.27"></a>
<span class="sourceLineNo">028</span>@InterfaceAudience.Public<a name="line.28"></a>
<span class="sourceLineNo">029</span>public enum Order {<a name="line.29"></a>
<span class="sourceLineNo">030</span> ASCENDING {<a name="line.30"></a>
<span class="sourceLineNo">031</span> @Override<a name="line.31"></a>
<span class="sourceLineNo">032</span> public int cmp(int cmp) {<a name="line.32"></a>
<span class="sourceLineNo">033</span> /* noop */ return cmp;<a name="line.33"></a>
<span class="sourceLineNo">034</span> }<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span> @Override<a name="line.36"></a>
<span class="sourceLineNo">037</span> public byte apply(byte val) {<a name="line.37"></a>
<span class="sourceLineNo">038</span> /* noop */ return val;<a name="line.38"></a>
<span class="sourceLineNo">039</span> }<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span> @Override<a name="line.41"></a>
<span class="sourceLineNo">042</span> public void apply(byte[] val) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> /* noop */<a name="line.43"></a>
<span class="sourceLineNo">044</span> }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span> @Override<a name="line.46"></a>
<span class="sourceLineNo">047</span> public void apply(byte[] val, int offset, int length) {<a name="line.47"></a>
<span class="sourceLineNo">048</span> /* noop */<a name="line.48"></a>
<span class="sourceLineNo">049</span> }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> @Override<a name="line.51"></a>
<span class="sourceLineNo">052</span> public String toString() {<a name="line.52"></a>
<span class="sourceLineNo">053</span> return "ASCENDING";<a name="line.53"></a>
<span class="sourceLineNo">054</span> }<a name="line.54"></a>
<span class="sourceLineNo">055</span> },<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span> DESCENDING {<a name="line.57"></a>
<span class="sourceLineNo">058</span> /**<a name="line.58"></a>
<span class="sourceLineNo">059</span> * A {@code byte} value is inverted by taking its 1's Complement, achieved<a name="line.59"></a>
<span class="sourceLineNo">060</span> * via {@code xor} with {@code 0xff}.<a name="line.60"></a>
<span class="sourceLineNo">061</span> */<a name="line.61"></a>
<span class="sourceLineNo">062</span> private static final byte MASK = (byte) 0xff;<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span> @Override<a name="line.64"></a>
<span class="sourceLineNo">065</span> public int cmp(int cmp) {<a name="line.65"></a>
<span class="sourceLineNo">066</span> return -1 * cmp;<a name="line.66"></a>
<span class="sourceLineNo">067</span> }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span> @Override<a name="line.69"></a>
<span class="sourceLineNo">070</span> public byte apply(byte val) {<a name="line.70"></a>
<span class="sourceLineNo">071</span> return (byte) (val ^ MASK);<a name="line.71"></a>
<span class="sourceLineNo">072</span> }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span> @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span> public void apply(byte[] val) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> for (int i = 0; i &lt; val.length; i++) {<a name="line.76"></a>
<span class="sourceLineNo">077</span> val[i] ^= MASK;<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span> @Override<a name="line.81"></a>
<span class="sourceLineNo">082</span> public void apply(byte[] val, int offset, int length) {<a name="line.82"></a>
<span class="sourceLineNo">083</span> for (int i = 0; i &lt; length; i++) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> val[offset + i] ^= MASK;<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span> }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span> @Override<a name="line.88"></a>
<span class="sourceLineNo">089</span> public String toString() {<a name="line.89"></a>
<span class="sourceLineNo">090</span> return "DESCENDING";<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span> };<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span> /**<a name="line.94"></a>
<span class="sourceLineNo">095</span> * Returns the adjusted trichotomous value according to the ordering imposed by this<a name="line.95"></a>
<span class="sourceLineNo">096</span> * {@code Order}.<a name="line.96"></a>
<span class="sourceLineNo">097</span> */<a name="line.97"></a>
<span class="sourceLineNo">098</span> public abstract int cmp(int cmp);<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span> /**<a name="line.100"></a>
<span class="sourceLineNo">101</span> * Apply order to the byte {@code val}.<a name="line.101"></a>
<span class="sourceLineNo">102</span> */<a name="line.102"></a>
<span class="sourceLineNo">103</span> public abstract byte apply(byte val);<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span> /**<a name="line.105"></a>
<span class="sourceLineNo">106</span> * Apply order to the byte array {@code val}.<a name="line.106"></a>
<span class="sourceLineNo">107</span> */<a name="line.107"></a>
<span class="sourceLineNo">108</span> public abstract void apply(byte[] val);<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span> /**<a name="line.110"></a>
<span class="sourceLineNo">111</span> * Apply order to a range within the byte array {@code val}.<a name="line.111"></a>
<span class="sourceLineNo">112</span> */<a name="line.112"></a>
<span class="sourceLineNo">113</span> public abstract void apply(byte[] val, int offset, int length);<a name="line.113"></a>
<span class="sourceLineNo">114</span>}<a name="line.114"></a>
</pre>
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