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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.util;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.util.ArrayList;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.Collections;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.Iterator;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.List;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.SortedSet;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.CellComparator;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.ExtendedCell;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.regionserver.NonReversedNonLazyKeyValueScanner;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">029</span><span id="line-29"></span> |
| <span class="source-line-no">030</span><span id="line-30">/**</span> |
| <span class="source-line-no">031</span><span id="line-31"> * Utility scanner that wraps a sortable collection and serves as a KeyValueScanner.</span> |
| <span class="source-line-no">032</span><span id="line-32"> */</span> |
| <span class="source-line-no">033</span><span id="line-33">@InterfaceAudience.Private</span> |
| <span class="source-line-no">034</span><span id="line-34">public class CollectionBackedScanner extends NonReversedNonLazyKeyValueScanner {</span> |
| <span class="source-line-no">035</span><span id="line-35"> final private Iterable<ExtendedCell> data;</span> |
| <span class="source-line-no">036</span><span id="line-36"> final CellComparator comparator;</span> |
| <span class="source-line-no">037</span><span id="line-37"> private Iterator<ExtendedCell> iter;</span> |
| <span class="source-line-no">038</span><span id="line-38"> private ExtendedCell current;</span> |
| <span class="source-line-no">039</span><span id="line-39"></span> |
| <span class="source-line-no">040</span><span id="line-40"> public CollectionBackedScanner(SortedSet<ExtendedCell> set) {</span> |
| <span class="source-line-no">041</span><span id="line-41"> this(set, CellComparator.getInstance());</span> |
| <span class="source-line-no">042</span><span id="line-42"> }</span> |
| <span class="source-line-no">043</span><span id="line-43"></span> |
| <span class="source-line-no">044</span><span id="line-44"> public CollectionBackedScanner(SortedSet<ExtendedCell> set, CellComparator comparator) {</span> |
| <span class="source-line-no">045</span><span id="line-45"> this.comparator = comparator;</span> |
| <span class="source-line-no">046</span><span id="line-46"> data = set;</span> |
| <span class="source-line-no">047</span><span id="line-47"> init();</span> |
| <span class="source-line-no">048</span><span id="line-48"> }</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> public CollectionBackedScanner(List<ExtendedCell> list) {</span> |
| <span class="source-line-no">051</span><span id="line-51"> this(list, CellComparator.getInstance());</span> |
| <span class="source-line-no">052</span><span id="line-52"> }</span> |
| <span class="source-line-no">053</span><span id="line-53"></span> |
| <span class="source-line-no">054</span><span id="line-54"> public CollectionBackedScanner(List<ExtendedCell> list, CellComparator comparator) {</span> |
| <span class="source-line-no">055</span><span id="line-55"> Collections.sort(list, comparator);</span> |
| <span class="source-line-no">056</span><span id="line-56"> this.comparator = comparator;</span> |
| <span class="source-line-no">057</span><span id="line-57"> data = list;</span> |
| <span class="source-line-no">058</span><span id="line-58"> init();</span> |
| <span class="source-line-no">059</span><span id="line-59"> }</span> |
| <span class="source-line-no">060</span><span id="line-60"></span> |
| <span class="source-line-no">061</span><span id="line-61"> public CollectionBackedScanner(CellComparator comparator, ExtendedCell... array) {</span> |
| <span class="source-line-no">062</span><span id="line-62"> this.comparator = comparator;</span> |
| <span class="source-line-no">063</span><span id="line-63"></span> |
| <span class="source-line-no">064</span><span id="line-64"> List<ExtendedCell> tmp = new ArrayList<>(array.length);</span> |
| <span class="source-line-no">065</span><span id="line-65"> Collections.addAll(tmp, array);</span> |
| <span class="source-line-no">066</span><span id="line-66"> Collections.sort(tmp, comparator);</span> |
| <span class="source-line-no">067</span><span id="line-67"> data = tmp;</span> |
| <span class="source-line-no">068</span><span id="line-68"> init();</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</span> |
| <span class="source-line-no">070</span><span id="line-70"></span> |
| <span class="source-line-no">071</span><span id="line-71"> private void init() {</span> |
| <span class="source-line-no">072</span><span id="line-72"> iter = data.iterator();</span> |
| <span class="source-line-no">073</span><span id="line-73"> if (iter.hasNext()) {</span> |
| <span class="source-line-no">074</span><span id="line-74"> current = iter.next();</span> |
| <span class="source-line-no">075</span><span id="line-75"> }</span> |
| <span class="source-line-no">076</span><span id="line-76"> }</span> |
| <span class="source-line-no">077</span><span id="line-77"></span> |
| <span class="source-line-no">078</span><span id="line-78"> @Override</span> |
| <span class="source-line-no">079</span><span id="line-79"> public ExtendedCell peek() {</span> |
| <span class="source-line-no">080</span><span id="line-80"> return current;</span> |
| <span class="source-line-no">081</span><span id="line-81"> }</span> |
| <span class="source-line-no">082</span><span id="line-82"></span> |
| <span class="source-line-no">083</span><span id="line-83"> @Override</span> |
| <span class="source-line-no">084</span><span id="line-84"> public ExtendedCell next() {</span> |
| <span class="source-line-no">085</span><span id="line-85"> ExtendedCell oldCurrent = current;</span> |
| <span class="source-line-no">086</span><span id="line-86"> if (iter.hasNext()) {</span> |
| <span class="source-line-no">087</span><span id="line-87"> current = iter.next();</span> |
| <span class="source-line-no">088</span><span id="line-88"> } else {</span> |
| <span class="source-line-no">089</span><span id="line-89"> current = null;</span> |
| <span class="source-line-no">090</span><span id="line-90"> }</span> |
| <span class="source-line-no">091</span><span id="line-91"> return oldCurrent;</span> |
| <span class="source-line-no">092</span><span id="line-92"> }</span> |
| <span class="source-line-no">093</span><span id="line-93"></span> |
| <span class="source-line-no">094</span><span id="line-94"> @Override</span> |
| <span class="source-line-no">095</span><span id="line-95"> public boolean seek(ExtendedCell seekCell) {</span> |
| <span class="source-line-no">096</span><span id="line-96"> // restart iterator</span> |
| <span class="source-line-no">097</span><span id="line-97"> iter = data.iterator();</span> |
| <span class="source-line-no">098</span><span id="line-98"> return reseek(seekCell);</span> |
| <span class="source-line-no">099</span><span id="line-99"> }</span> |
| <span class="source-line-no">100</span><span id="line-100"></span> |
| <span class="source-line-no">101</span><span id="line-101"> @Override</span> |
| <span class="source-line-no">102</span><span id="line-102"> public boolean reseek(ExtendedCell seekCell) {</span> |
| <span class="source-line-no">103</span><span id="line-103"> while (iter.hasNext()) {</span> |
| <span class="source-line-no">104</span><span id="line-104"> ExtendedCell next = iter.next();</span> |
| <span class="source-line-no">105</span><span id="line-105"> int ret = comparator.compare(next, seekCell);</span> |
| <span class="source-line-no">106</span><span id="line-106"> if (ret >= 0) {</span> |
| <span class="source-line-no">107</span><span id="line-107"> current = next;</span> |
| <span class="source-line-no">108</span><span id="line-108"> return true;</span> |
| <span class="source-line-no">109</span><span id="line-109"> }</span> |
| <span class="source-line-no">110</span><span id="line-110"> }</span> |
| <span class="source-line-no">111</span><span id="line-111"> return false;</span> |
| <span class="source-line-no">112</span><span id="line-112"> }</span> |
| <span class="source-line-no">113</span><span id="line-113"></span> |
| <span class="source-line-no">114</span><span id="line-114"> @Override</span> |
| <span class="source-line-no">115</span><span id="line-115"> public void close() {</span> |
| <span class="source-line-no">116</span><span id="line-116"> // do nothing</span> |
| <span class="source-line-no">117</span><span id="line-117"> }</span> |
| <span class="source-line-no">118</span><span id="line-118">}</span> |
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| </pre> |
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