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/**
 * Licensed 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.
 *
 * Copyright 2012-2016 the original author or authors.
 */
package com.fitbur.assertj.error;

/**
 * Creates an error message indicating that an assertion that verifies that a {@link Throwable} have a cause instance of
 * a certain type.
 * 
 * @author Jean-Christophe Gay
 */
public class ShouldHaveCauseInstance extends BasicErrorMessageFactory {

  /**
   * Creates a new {@link com.fitbur.assertj.error.BasicErrorMessageFactory}.
   * 
   * @param actual the actual value in the failed assertion.
   * @param expectedCauseType the expected cause type.
   * @return the created {@code ErrorMessageFactory}.
   */
  public static ErrorMessageFactory shouldHaveCauseInstance(Throwable actual,
      Class expectedCauseType) {
    return actual.getCause() == null ? new ShouldHaveCauseInstance(expectedCauseType) : new ShouldHaveCauseInstance(
        actual, expectedCauseType);
  }

  private ShouldHaveCauseInstance(Throwable actual, Class expectedCauseType) {
    super("%nExpecting a throwable with cause being an instance of:%n <%s>%nbut was an instance of:%n <%s>",
        expectedCauseType, actual.getCause());
  }

  private ShouldHaveCauseInstance(Class expectedCauseType) {
    super("%nExpecting a throwable with cause being an instance of:%n <%s>%nbut current throwable has no cause.",
        expectedCauseType);
  }
}