| /* |
| * 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 final WindowsPath dir; |
| private final DirectoryStream.Filter<? super Path> filter; |
| |
| // handle to directory |
| private final long handle; |
| // first entry in the directory |
| private final String firstName; |
| |
| // buffer for WIN32_FIND_DATA structure that receives information about file |
| private final NativeBuffer findDataBuffer; |
| |
| 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; |
| |
| try { |
| // Need to append * or \* to match entries in directory. |
| String search = dir.getPathForWin32Calls(); |
| char last = search.charAt(search.length() -1); |
| if (last == ':' || last == '\\') { |
| search += "*"; |
| } else { |
| search += "\\*"; |
| } |
| |
| FirstFile first = FindFirstFile(search); |
| this.handle = first.handle(); |
| this.firstName = first.name(); |
| this.findDataBuffer = WindowsFileAttributes.getBufferForFindData(); |
| } catch (WindowsException x) { |
| 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; |
| } |
| findDataBuffer.release(); |
| try { |
| FindClose(handle); |
| } 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(firstName); |
| return iterator; |
| } |
| } |
| |
| private class WindowsDirectoryIterator implements Iterator<Path> { |
| private boolean atEof; |
| private String first; |
| private Path nextEntry; |
| private String prefix; |
| |
| WindowsDirectoryIterator(String first) { |
| atEof = false; |
| this.first = first; |
| 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() { |
| // handle first element returned by search |
| if (first != null) { |
| nextEntry = isSelfOrParent(first) ? null : acceptEntry(first, null); |
| first = null; |
| if (nextEntry != null) |
| return nextEntry; |
| } |
| |
| for (;;) { |
| String name = null; |
| WindowsFileAttributes attrs; |
| |
| // synchronize on closeLock to prevent close while reading |
| synchronized (closeLock) { |
| try { |
| if (isOpen) { |
| name = FindNextFile(handle, findDataBuffer.address()); |
| } |
| } catch (WindowsException x) { |
| IOException ioe = x.asIOException(dir); |
| throw new DirectoryIteratorException(ioe); |
| } |
| |
| // NO_MORE_FILES or stream closed |
| if (name == null) { |
| atEof = true; |
| return null; |
| } |
| |
| // ignore link to self and parent directories |
| if (isSelfOrParent(name)) |
| continue; |
| |
| // grab the attributes from the WIN32_FIND_DATA structure |
| // (needs to be done while holding closeLock because close |
| // will release the buffer) |
| attrs = WindowsFileAttributes |
| .fromFindData(findDataBuffer.address()); |
| } |
| |
| // 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(); |
| } |
| } |
| } |