| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.nio.file; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.UncheckedIOException; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.nio.file.FileTreeWalker.Event; |
| |
| /** |
| * An {@code Iterator} to iterate over the nodes of a file tree. |
| * |
| * <pre>{@code |
| * try (FileTreeIterator iterator = new FileTreeIterator(start, maxDepth, options)) { |
| * while (iterator.hasNext()) { |
| * Event ev = iterator.next(); |
| * Path path = ev.file(); |
| * BasicFileAttributes attrs = ev.attributes(); |
| * } |
| * } |
| * }</pre> |
| */ |
| |
| class FileTreeIterator implements Iterator<Event>, Closeable { |
| private final FileTreeWalker walker; |
| private Event next; |
| |
| /** |
| * Creates a new iterator to walk the file tree starting at the given file. |
| * |
| * @throws IllegalArgumentException |
| * if {@code maxDepth} is negative |
| * @throws IOException |
| * if an I/O errors occurs opening the starting file |
| * @throws SecurityException |
| * if the security manager denies access to the starting file |
| * @throws NullPointerException |
| * if {@code start} or {@code options} is {@code null} or |
| * the options array contains a {@code null} element |
| */ |
| FileTreeIterator(Path start, int maxDepth, FileVisitOption... options) |
| throws IOException |
| { |
| this.walker = new FileTreeWalker(Arrays.asList(options), maxDepth); |
| this.next = walker.walk(start); |
| assert next.type() == FileTreeWalker.EventType.ENTRY || |
| next.type() == FileTreeWalker.EventType.START_DIRECTORY; |
| |
| // IOException if there a problem accessing the starting file |
| IOException ioe = next.ioeException(); |
| if (ioe != null) |
| throw ioe; |
| } |
| |
| private void fetchNextIfNeeded() { |
| if (next == null) { |
| FileTreeWalker.Event ev = walker.next(); |
| while (ev != null) { |
| IOException ioe = ev.ioeException(); |
| if (ioe != null) |
| throw new UncheckedIOException(ioe); |
| |
| // END_DIRECTORY events are ignored |
| if (ev.type() != FileTreeWalker.EventType.END_DIRECTORY) { |
| next = ev; |
| return; |
| } |
| ev = walker.next(); |
| } |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (!walker.isOpen()) |
| throw new IllegalStateException(); |
| fetchNextIfNeeded(); |
| return next != null; |
| } |
| |
| @Override |
| public Event next() { |
| if (!walker.isOpen()) |
| throw new IllegalStateException(); |
| fetchNextIfNeeded(); |
| if (next == null) |
| throw new NoSuchElementException(); |
| Event result = next; |
| next = null; |
| return result; |
| } |
| |
| @Override |
| public void close() { |
| walker.close(); |
| } |
| } |