| /* |
| * 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.guacamole.resource; |
| |
| import java.io.InputStream; |
| import java.io.SequenceInputStream; |
| import java.util.Arrays; |
| import java.util.Enumeration; |
| import java.util.Iterator; |
| |
| /** |
| * A resource which is the logical concatenation of other resources. |
| */ |
| public class SequenceResource extends AbstractResource { |
| |
| /** |
| * The resources to be concatenated. |
| */ |
| private final Iterable<Resource> resources; |
| |
| /** |
| * Returns the mimetype of the first resource in the given Iterable, or |
| * "application/octet-stream" if no resources are provided. |
| * |
| * @param resources |
| * The resources from which the mimetype should be retrieved. |
| * |
| * @return |
| * The mimetype of the first resource, or "application/octet-stream" |
| * if no resources were provided. |
| */ |
| private static String getMimeType(Iterable<Resource> resources) { |
| |
| // If no resources, just assume application/octet-stream |
| Iterator<Resource> resourceIterator = resources.iterator(); |
| if (!resourceIterator.hasNext()) |
| return "application/octet-stream"; |
| |
| // Return mimetype of first resource |
| return resourceIterator.next().getMimeType(); |
| |
| } |
| |
| /** |
| * Creates a new SequenceResource as the logical concatenation of the |
| * given resources. Each resource is concatenated in iteration order as |
| * needed when reading from the input stream of the SequenceResource. |
| * |
| * @param mimetype |
| * The mimetype of the resource. |
| * |
| * @param resources |
| * The resources to concatenate within the InputStream of this |
| * SequenceResource. |
| */ |
| public SequenceResource(String mimetype, Iterable<Resource> resources) { |
| super(mimetype); |
| this.resources = resources; |
| } |
| |
| /** |
| * Creates a new SequenceResource as the logical concatenation of the |
| * given resources. Each resource is concatenated in iteration order as |
| * needed when reading from the input stream of the SequenceResource. The |
| * mimetype of the resulting concatenation is derived from the first |
| * resource. |
| * |
| * @param resources |
| * The resources to concatenate within the InputStream of this |
| * SequenceResource. |
| */ |
| public SequenceResource(Iterable<Resource> resources) { |
| super(getMimeType(resources)); |
| this.resources = resources; |
| } |
| |
| /** |
| * Creates a new SequenceResource as the logical concatenation of the |
| * given resources. Each resource is concatenated in iteration order as |
| * needed when reading from the input stream of the SequenceResource. |
| * |
| * @param mimetype |
| * The mimetype of the resource. |
| * |
| * @param resources |
| * The resources to concatenate within the InputStream of this |
| * SequenceResource. |
| */ |
| public SequenceResource(String mimetype, Resource... resources) { |
| this(mimetype, Arrays.asList(resources)); |
| } |
| |
| /** |
| * Creates a new SequenceResource as the logical concatenation of the |
| * given resources. Each resource is concatenated in iteration order as |
| * needed when reading from the input stream of the SequenceResource. The |
| * mimetype of the resulting concatenation is derived from the first |
| * resource. |
| * |
| * @param resources |
| * The resources to concatenate within the InputStream of this |
| * SequenceResource. |
| */ |
| public SequenceResource(Resource... resources) { |
| this(Arrays.asList(resources)); |
| } |
| |
| @Override |
| public InputStream asStream() { |
| return new SequenceInputStream(new Enumeration<InputStream>() { |
| |
| /** |
| * Iterator over all resources associated with this |
| * SequenceResource. |
| */ |
| private final Iterator<Resource> resourceIterator = resources.iterator(); |
| |
| @Override |
| public boolean hasMoreElements() { |
| return resourceIterator.hasNext(); |
| } |
| |
| @Override |
| public InputStream nextElement() { |
| return resourceIterator.next().asStream(); |
| } |
| |
| }); |
| } |
| |
| } |