| /* |
| * Copyright (c) 2008, 2011, 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 sun.nio.fs; |
| |
| import java.nio.file.*; |
| import java.nio.file.attribute.BasicFileAttributes; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.io.IOException; |
| |
| import static sun.nio.fs.WindowsNativeDispatcher.*; |
| import static sun.nio.fs.WindowsConstants.*; |
| |
| /** |
| * Windows implementation of DirectoryStream |
| */ |
| |
| class WindowsDirectoryStream |
| implements DirectoryStream<Path> |
| { |
| private static final int NATIVE_BUFFER_SIZE = 8192; |
| |
| private final WindowsPath dir; |
| private final DirectoryStream.Filter<? super Path> filter; |
| |
| // Query directory information data structure |
| private final QueryDirectoryInformation queryDirectoryInformation; |
| |
| // Buffer used to receive file entries from NtQueryDirectoryInformation calls |
| private final NativeBuffer queryDirectoryInformationBuffer; |
| |
| private final Object closeLock = new Object(); |
| |
| // need closeLock to access these |
| private boolean isOpen = true; |
| private Iterator<Path> iterator; |
| |
| |
| WindowsDirectoryStream(WindowsPath dir, DirectoryStream.Filter<? super Path> filter) |
| throws IOException |
| { |
| this.dir = dir; |
| this.filter = filter; |
| |
| this.queryDirectoryInformationBuffer = NativeBuffers.getNativeBuffer(NATIVE_BUFFER_SIZE); |
| try { |
| // Open the directory for reading and read the first set of entries in the native buffer |
| String search = dir.getPathForWin32Calls(); |
| this.queryDirectoryInformation = OpenNtQueryDirectoryInformation(search, this.queryDirectoryInformationBuffer); |
| } catch (WindowsException x) { |
| // Release the buffer, as this instance is not fully constructed |
| this.queryDirectoryInformationBuffer.release(); |
| |
| if (x.lastError() == ERROR_DIRECTORY) { |
| throw new NotDirectoryException(dir.getPathForExceptionMessage()); |
| } |
| x.rethrowAsIOException(dir); |
| |
| // keep compiler happy |
| throw new AssertionError(); |
| } |
| } |
| |
| @Override |
| public void close() |
| throws IOException |
| { |
| synchronized (closeLock) { |
| if (!isOpen) |
| return; |
| isOpen = false; |
| } |
| queryDirectoryInformationBuffer.release(); |
| try { |
| CloseNtQueryDirectoryInformation(queryDirectoryInformation); |
| } catch (WindowsException x) { |
| x.rethrowAsIOException(dir); |
| } |
| } |
| |
| @Override |
| public Iterator<Path> iterator() { |
| if (!isOpen) { |
| throw new IllegalStateException("Directory stream is closed"); |
| } |
| synchronized (this) { |
| if (iterator != null) |
| throw new IllegalStateException("Iterator already obtained"); |
| iterator = new WindowsDirectoryIterator(); |
| return iterator; |
| } |
| } |
| |
| private class WindowsDirectoryIterator implements Iterator<Path> { |
| private boolean atEof; |
| private Path nextEntry; |
| private String prefix; |
| private int nextOffset; |
| |
| WindowsDirectoryIterator() { |
| atEof = false; |
| nextOffset = 0; |
| if (dir.needsSlashWhenResolving()) { |
| prefix = dir.toString() + "\\"; |
| } else { |
| prefix = dir.toString(); |
| } |
| } |
| |
| // links to self and parent directories are ignored |
| private boolean isSelfOrParent(String name) { |
| return name.equals(".") || name.equals(".."); |
| } |
| |
| // applies filter and also ignores "." and ".." |
| private Path acceptEntry(String s, BasicFileAttributes attrs) { |
| Path entry = WindowsPath |
| .createFromNormalizedPath(dir.getFileSystem(), prefix + s, attrs); |
| try { |
| if (filter.accept(entry)) |
| return entry; |
| } catch (IOException ioe) { |
| throw new DirectoryIteratorException(ioe); |
| } |
| return null; |
| } |
| |
| // reads next directory entry |
| private Path readNextEntry() { |
| for (;;) { |
| String name; |
| WindowsFileAttributes attrs; |
| |
| // synchronize on closeLock to prevent close while reading |
| synchronized (closeLock) { |
| // Fetch next set of entries if we don't have anything available in buffer |
| if (nextOffset < 0) { |
| try { |
| atEof = !NextNtQueryDirectoryInformation(queryDirectoryInformation, queryDirectoryInformationBuffer); |
| } catch (WindowsException x) { |
| IOException ioe = x.asIOException(dir); |
| throw new DirectoryIteratorException(ioe); |
| } |
| if (atEof) { |
| return null; |
| } |
| nextOffset = 0; |
| } |
| |
| long fullDirInformationAddress = queryDirectoryInformationBuffer.address() + nextOffset; |
| int nextEntryOffset = WindowsFileAttributes.getNextOffsetFromFileIdFullDirInformation(fullDirInformationAddress); |
| nextOffset = nextEntryOffset == 0 ? -1 : nextOffset + nextEntryOffset; |
| name = WindowsFileAttributes.getFileNameFromFileIdFullDirInformation(fullDirInformationAddress); |
| if (isSelfOrParent(name)) { |
| // Skip "." and ".." |
| continue; |
| } |
| attrs = WindowsFileAttributes.fromFileIdFullDirInformation(fullDirInformationAddress, queryDirectoryInformation.volSerialNumber()); |
| } |
| |
| // return entry if accepted by filter |
| Path entry = acceptEntry(name, attrs); |
| if (entry != null) |
| return entry; |
| } |
| } |
| |
| @Override |
| public synchronized boolean hasNext() { |
| if (nextEntry == null && !atEof) |
| nextEntry = readNextEntry(); |
| return nextEntry != null; |
| } |
| |
| @Override |
| public synchronized Path next() { |
| Path result = null; |
| if (nextEntry == null && !atEof) { |
| result = readNextEntry(); |
| } else { |
| result = nextEntry; |
| nextEntry = null; |
| } |
| if (result == null) |
| throw new NoSuchElementException(); |
| return result; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| } |