| /* |
| * 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.sling.servlets.post.impl.helper; |
| |
| import org.apache.sling.api.resource.Resource; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Iterator; |
| |
| /** |
| * An input stream that reads from a list of resources that can be adapted into input streams. |
| */ |
| public class ResourceIteratorInputStream extends InputStream { |
| private static final Logger LOGGER = LoggerFactory.getLogger(ResourceIteratorInputStream.class); |
| private int n; |
| private InputStream currentStream; |
| private final Iterator<Resource> iterator; |
| private int streamNo = 0; |
| |
| public ResourceIteratorInputStream(Iterator<Resource> iterator) { |
| this.iterator = iterator; |
| while(iterator.hasNext()) { |
| currentStream = iterator.next().adaptTo(InputStream.class); |
| if ( currentStream != null) { |
| n = 0; |
| streamNo = 1; |
| return; |
| } |
| } |
| throw new IllegalArgumentException("Resource iterator does not contain any resources that can be adapted to an input stream."); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| int i = currentStream.read(); |
| while ( i == -1 ) { |
| if ( iterator.hasNext()) { |
| LOGGER.debug("Stream {} provided {} bytes. ",streamNo, n); |
| currentStream = iterator.next().adaptTo(InputStream.class); |
| streamNo++; |
| n = 0; |
| if (currentStream != null) { |
| i = currentStream.read(); |
| } |
| } else { |
| LOGGER.debug("Last Stream {} provided {} bytes. ",streamNo, n); |
| return -1; |
| } |
| } |
| n++; |
| return i; |
| } |
| } |