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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;</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.function.Supplier;</span> |
| <span class="source-line-no">021</span><span id="line-21">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.hamcrest.Description;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.hamcrest.Matcher;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.hamcrest.StringDescription;</span> |
| <span class="source-line-no">025</span><span id="line-25"></span> |
| <span class="source-line-no">026</span><span id="line-26">/**</span> |
| <span class="source-line-no">027</span><span id="line-27"> * An implementation of {@link Waiter.ExplainingPredicate} that uses Hamcrest {@link Matcher} for</span> |
| <span class="source-line-no">028</span><span id="line-28"> * both predicate evaluation and explanation.</span> |
| <span class="source-line-no">029</span><span id="line-29"> * @param <T> The type of value to be evaluated via {@link Matcher}.</span> |
| <span class="source-line-no">030</span><span id="line-30"> */</span> |
| <span class="source-line-no">031</span><span id="line-31">@InterfaceAudience.Private</span> |
| <span class="source-line-no">032</span><span id="line-32">public class MatcherPredicate<T> implements Waiter.ExplainingPredicate<RuntimeException> {</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34"> private final String reason;</span> |
| <span class="source-line-no">035</span><span id="line-35"> private final Supplier<T> supplier;</span> |
| <span class="source-line-no">036</span><span id="line-36"> private final Matcher<? super T> matcher;</span> |
| <span class="source-line-no">037</span><span id="line-37"> private T currentValue;</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> public MatcherPredicate(final Supplier<T> supplier, final Matcher<? super T> matcher) {</span> |
| <span class="source-line-no">040</span><span id="line-40"> this("", supplier, matcher);</span> |
| <span class="source-line-no">041</span><span id="line-41"> }</span> |
| <span class="source-line-no">042</span><span id="line-42"></span> |
| <span class="source-line-no">043</span><span id="line-43"> public MatcherPredicate(final String reason, final Supplier<T> supplier,</span> |
| <span class="source-line-no">044</span><span id="line-44"> final Matcher<? super T> matcher) {</span> |
| <span class="source-line-no">045</span><span id="line-45"> this.reason = reason;</span> |
| <span class="source-line-no">046</span><span id="line-46"> this.supplier = supplier;</span> |
| <span class="source-line-no">047</span><span id="line-47"> this.matcher = matcher;</span> |
| <span class="source-line-no">048</span><span id="line-48"> this.currentValue = null;</span> |
| <span class="source-line-no">049</span><span id="line-49"> }</span> |
| <span class="source-line-no">050</span><span id="line-50"></span> |
| <span class="source-line-no">051</span><span id="line-51"> @Override</span> |
| <span class="source-line-no">052</span><span id="line-52"> public boolean evaluate() {</span> |
| <span class="source-line-no">053</span><span id="line-53"> currentValue = supplier.get();</span> |
| <span class="source-line-no">054</span><span id="line-54"> return matcher.matches(currentValue);</span> |
| <span class="source-line-no">055</span><span id="line-55"> }</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> @Override</span> |
| <span class="source-line-no">058</span><span id="line-58"> public String explainFailure() {</span> |
| <span class="source-line-no">059</span><span id="line-59"> final Description description = new StringDescription().appendText(reason)</span> |
| <span class="source-line-no">060</span><span id="line-60"> .appendText("\nExpected: ").appendDescriptionOf(matcher).appendText("\n but: ");</span> |
| <span class="source-line-no">061</span><span id="line-61"> matcher.describeMismatch(currentValue, description);</span> |
| <span class="source-line-no">062</span><span id="line-62"> return description.toString();</span> |
| <span class="source-line-no">063</span><span id="line-63"> }</span> |
| <span class="source-line-no">064</span><span id="line-64">}</span> |
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