/*
    * 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.commons.compress.utils;
  
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  import java.util.ServiceConfigurationError;
  import java.util.ServiceLoader;
  
  /**
   * Iterates all services for a given class through the standard {@link ServiceLoader} mechanism.
   *
   * @param <E> The service to load
   * @since 1.13
   * @deprecated No longer needed.
   */
  @Deprecated
  public class ServiceLoaderIterator<E> implements Iterator<E> {
  
      private E nextServiceLoader;
      private final Class<E> service;
      private final Iterator<E> serviceLoaderIterator;
  
      public ServiceLoaderIterator(final Class<E> service) {
          this(service, ClassLoader.getSystemClassLoader());
      }
  
      public ServiceLoaderIterator(final Class<E> service, final ClassLoader classLoader) {
          this.service = service;
          this.serviceLoaderIterator = ServiceLoader.load(service, classLoader).iterator();
      }
  
      @Override
      public boolean hasNext() {
          while (nextServiceLoader == null) {
              try {
                  if (!serviceLoaderIterator.hasNext()) {
                      return false;
                  }
                  nextServiceLoader = serviceLoaderIterator.next();
              } catch (final ServiceConfigurationError e) {
                  if (e.getCause() instanceof SecurityException) {
                      // Ignore security exceptions
                      // TODO Log?
                      continue;
                  }
                  throw e;
              }
          }
          return true;
      }
  
      @Override
      public E next() {
          if (!hasNext()) {
              throw new NoSuchElementException("No more elements for service " + service.getName());
          }
          final E tempNext = nextServiceLoader;
          nextServiceLoader = null;
          return tempNext;
      }
  
      @Override
      public void remove() {
          throw new UnsupportedOperationException("service=" + service.getName());
      }
  
  }