001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 020package org.apache.commons.compress.utils; 021 022import java.util.Iterator; 023import java.util.NoSuchElementException; 024import java.util.ServiceConfigurationError; 025import java.util.ServiceLoader; 026 027/** 028 * Iterates all services for a given class through the standard 029 * {@link ServiceLoader} mechanism. 030 * 031 * @param <E> 032 * The service to load 033 * @since 1.13 034 * @deprecated No longer needed. 035 */ 036@Deprecated 037public class ServiceLoaderIterator<E> implements Iterator<E> { 038 039 private E nextServiceLoader; 040 private final Class<E> service; 041 private final Iterator<E> serviceLoaderIterator; 042 043 public ServiceLoaderIterator(final Class<E> service) { 044 this(service, ClassLoader.getSystemClassLoader()); 045 } 046 047 public ServiceLoaderIterator(final Class<E> service, final ClassLoader classLoader) { 048 this.service = service; 049 this.serviceLoaderIterator = ServiceLoader.load(service, classLoader).iterator(); 050 } 051 052 @Override 053 public boolean hasNext() { 054 while (nextServiceLoader == null) { 055 try { 056 if (!serviceLoaderIterator.hasNext()) { 057 return false; 058 } 059 nextServiceLoader = serviceLoaderIterator.next(); 060 } catch (final ServiceConfigurationError e) { 061 if (e.getCause() instanceof SecurityException) { 062 // Ignore security exceptions 063 // TODO Log? 064 continue; 065 } 066 throw e; 067 } 068 } 069 return true; 070 } 071 072 @Override 073 public E next() { 074 if (!hasNext()) { 075 throw new NoSuchElementException("No more elements for service " + service.getName()); 076 } 077 final E tempNext = nextServiceLoader; 078 nextServiceLoader = null; 079 return tempNext; 080 } 081 082 @Override 083 public void remove() { 084 throw new UnsupportedOperationException("service=" + service.getName()); 085 } 086 087}