content: /*
   * Copyright (c) OSGi Alliance 2015. All Rights Reserved.
   *
   * 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.
   */
  package org.osgi.util.promise;
  
  import java.util.Collection;
  import java.util.Collections;
  
  /**
   * Promise failure exception for a collection of failed Promises.
   */
  public class FailedPromisesException extends RuntimeException {
  
      private final Collection<Promise<?>> failed;
  
      /**
       * Create a new FailedPromisesException with the specified Promises.
       *
       * @param failed A collection of Promises that have been resolved with a failure. Must not be null.
       */
      public FailedPromisesException(Collection<Promise<?>> failed) {
          this(failed, null);
      }
  
      /**
       * Create a new FailedPromisesException with the specified Promises.
       *
       * @param failed A collection of Promises that have been resolved with a failure. Must not be null.
       * @param cause  the cause (which is saved for later retrieval by the {@link #getCause()} method).  (A <tt>null</tt>
       *               value is permitted, and indicates that the cause is nonexistent or unknown.)
       */
      public FailedPromisesException(Collection<Promise<?>> failed, Throwable cause) {
          super(cause);
          assert failed != null;
          this.failed = failed;
      }
  
      /**
       * Returns the collection of Promises that have been resolved with a failure.
       *
       * @return The collection of Promises that have been resolved with a failure. The returned collection is
       * unmodifiable.
       */
      public Collection<Promise<?>> getFailedPromises() {
          return Collections.unmodifiableCollection(failed);
      }
  }
  