storm-client/test/jvm/org/apache/storm/utils/ThrowableNestedCauseMatcher.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.storm.utils;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;

public class ThrowableNestedCauseMatcher extends TypeSafeMatcher<Throwable> {

    private final Class<? extends Throwable> exceptionCause;

    public ThrowableNestedCauseMatcher(Class<? extends Throwable> exceptionCause) {
        this.exceptionCause = exceptionCause;
    }

    public static ThrowableNestedCauseMatcher isCausedBy(Class<? extends Throwable> exceptionCause) {
        return new ThrowableNestedCauseMatcher(exceptionCause);
    }

    @Override
    protected boolean matchesSafely(Throwable throwable) {
        return Utils.exceptionCauseIsInstanceOf(exceptionCause, throwable);
    }

    @Override
    public void describeTo(Description description) {
        description.appendText(exceptionCause.getName());
    }
}