1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal.jrtfs; 27 28 import java.nio.file.DirectoryStream; 29 import java.nio.file.ClosedDirectoryStreamException; 30 import java.nio.file.NotDirectoryException; 31 import java.nio.file.Path; 32 import java.util.Iterator; 33 import java.util.NoSuchElementException; 34 import java.io.IOException; 35 36 final class JrtDirectoryStream implements DirectoryStream<Path> { 37 private final JrtFileSystem jrtfs; 38 private final byte[] path; 39 private final DirectoryStream.Filter<? super Path> filter; 40 private volatile boolean isClosed; 41 private volatile Iterator<Path> itr; 42 43 JrtDirectoryStream(JrtPath jrtPath, 44 DirectoryStream.Filter<? super java.nio.file.Path> filter) 45 throws IOException 46 { 47 this.jrtfs = jrtPath.getFileSystem(); 48 this.path = jrtPath.getResolvedPath(); 49 this.filter = filter; 50 // sanity check 51 if (!jrtfs.isDirectory(path)) 52 throw new NotDirectoryException(jrtPath.toString()); 53 } 54 55 @Override 56 public synchronized Iterator<Path> iterator() { 57 if (isClosed) 58 throw new ClosedDirectoryStreamException(); 59 if (itr != null) 60 throw new IllegalStateException("Iterator has already been returned"); 61 62 try { 63 itr = jrtfs.iteratorOf(path, filter); 64 } catch (IOException e) { 65 throw new IllegalStateException(e); 66 } 67 return new Iterator<Path>() { 68 private Path next; 69 @Override 70 public boolean hasNext() { 71 if (isClosed) 72 return false; 73 return itr.hasNext(); 74 } 75 76 @Override 77 public synchronized Path next() { 78 if (isClosed) 79 throw new NoSuchElementException(); 80 return itr.next(); 81 } 82 83 @Override 84 public void remove() { 85 throw new UnsupportedOperationException(); 86 } 87 }; 88 } 89 90 @Override 91 public synchronized void close() throws IOException { 92 isClosed = true; 93 } 94 }