| /* |
| * 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.lucene.mockfile; |
| |
| import java.io.IOException; |
| import java.nio.file.DirectoryStream; |
| import java.nio.file.FileSystem; |
| import java.nio.file.Path; |
| import java.util.Iterator; |
| import java.util.Objects; |
| |
| /** |
| * A {@code FilterDirectoryStream} contains another |
| * {@code DirectoryStream}, which it uses as its basic |
| * source of data, possibly transforming the data along the |
| * way or providing additional functionality. |
| */ |
| public class FilterDirectoryStream implements DirectoryStream<Path> { |
| |
| /** |
| * The underlying {@code DirectoryStream} instance. |
| */ |
| protected final DirectoryStream<Path> delegate; |
| |
| /** |
| * The underlying {@code FileSystem} instance. |
| */ |
| protected final FileSystem fileSystem; |
| |
| /** |
| * Construct a {@code FilterDirectoryStream} based on |
| * the specified base stream. |
| * <p> |
| * Note that base stream is closed if this stream is closed. |
| * @param delegate specified base stream. |
| */ |
| public FilterDirectoryStream(DirectoryStream<Path> delegate, FileSystem fileSystem) { |
| this.delegate = Objects.requireNonNull(delegate); |
| this.fileSystem = Objects.requireNonNull(fileSystem); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| delegate.close(); |
| } |
| |
| @Override |
| public Iterator<Path> iterator() { |
| final Iterator<Path> delegateIterator = delegate.iterator(); |
| return new Iterator<Path>() { |
| @Override |
| public boolean hasNext() { |
| return delegateIterator.hasNext(); |
| } |
| @Override |
| public Path next() { |
| return new FilterPath(delegateIterator.next(), fileSystem); |
| } |
| @Override |
| public void remove() { |
| delegateIterator.remove(); |
| } |
| }; |
| } |
| } |