content: /*
   *  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.causeway.testing.unittestsupport.applib.matchers;
  
  import org.hamcrest.Description;
  import org.hamcrest.Matcher;
  import org.hamcrest.TypeSafeMatcher;
  
  import org.apache.causeway.commons.internal.exceptions._Exceptions;
  
  /**
   * @since 2.0 {@index}
   */
  public class ThrowableMatchers {
  
      ThrowableMatchers(){}
  
      /**
       * Matches when the exception's causal chain contains the given {@code type}
       * @param type
       */
      public static TypeSafeMatcher<Throwable> causedBy(final Class<? extends Throwable> type) {
          return new TypeSafeMatcher<Throwable>() {
  
              @Override
              protected boolean matchesSafely(final Throwable throwable) {
                  return _Exceptions.getCausalChain(throwable) // non null result
                  .stream()
                  .anyMatch(t->t.getClass().equals(type));
              }
  
              @Override
              public void describeTo(final Description description) {
                  description.appendText("Caused by " + type.getName());
              }
  
          };
      }
  
      public Matcher<Throwable> causalChainHasMessageWith(final String messageFragment) {
          return new TypeSafeMatcher<>() {
  
              @Override
              public void describeTo(Description arg0) {
                  arg0.appendText("causal chain has message with " + messageFragment);
              }
  
              @Override
              protected boolean matchesSafely(Throwable e) {
                  for (Throwable ex : _Exceptions.getCausalChain(e)) {
                      if (ex.getMessage().contains(messageFragment)) {
                          return true;
                      }
                  }
                  return false;
              }
          };
      }
  
  }
  