@@ -0,0 +1,2163 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one%0A * or more contributor license agreements.  See the NOTICE file%0A * distributed with this work for additional information%0A * regarding copyright ownership.  The ASF licenses this file%0A * to you under the Apache License, Version 2.0 (the%0A * %22License%22); you may not use this file except in compliance%0A * with the License.  You may obtain a copy of the License at%0A *%0A *    http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage org.apache.flink.util;%0A%0Aimport org.hamcrest.Description;%0Aimport org.hamcrest.Matcher;%0Aimport org.hamcrest.TypeSafeDiagnosingMatcher;%0A%0Aimport java.util.Optional;%0A%0A/**%0A * Hamcrest matchers.%0A */%0Apublic class CoreMatchers %7B%0A%0A%09public static Matcher%3CThrowable%3E containsCause(Throwable failureCause) %7B%0A%09%09return new ContainsCauseMatcher(failureCause);%0A%09%7D%0A%0A%09private static class ContainsCauseMatcher extends TypeSafeDiagnosingMatcher%3CThrowable%3E %7B%0A%0A%09%09private final Throwable failureCause;%0A%0A%09%09private ContainsCauseMatcher(Throwable failureCause) %7B%0A%09%09%09this.failureCause = failureCause;%0A%09%09%7D%0A%0A%09%09@Override%0A%09%09protected boolean matchesSafely(Throwable throwable, Description description) %7B%0A%09%09%09final Optional%3CThrowable%3E optionalCause = ExceptionUtils.findThrowable(throwable, cause -%3E cause.equals(failureCause));%0A%0A%09%09%09if (!optionalCause.isPresent()) %7B%0A%09%09%09%09description%0A%09%09%09%09%09.appendText(%22The throwable %22)%0A%09%09%09%09%09.appendValue(throwable)%0A%09%09%09%09%09.appendText(%22 does not contain the expected failure cause %22)%0A%09%09%09%09%09.appendValue(failureCause);%0A%09%09%09%7D%0A%0A%09%09%09return optionalCause.isPresent();%0A%09%09%7D%0A%0A%09%09@Override%0A%09%09public void describeTo(Description description) %7B%0A%09%09%09description%0A%09%09%09%09.appendText(%22Expected failure cause is %22)%0A%09%09%09%09.appendValue(failureCause);%0A%09%09%7D%0A%09%7D%0A%0A%09private CoreMatchers() %7B%0A%09%09throw new UnsupportedOperationException(%22Cannot instantiate an instance of this class.%22);%0A%09%7D%0A%7D%0A

Add CoreMatchers#containsCause