1 /* 2 * Copyright (c) 2009, 2019, 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.nio.zipfs; 27 28 import java.io.IOException; 29 import java.nio.file.ClosedDirectoryStreamException; 30 import java.nio.file.DirectoryIteratorException; 31 import java.nio.file.DirectoryStream; 32 import java.nio.file.NotDirectoryException; 33 import java.nio.file.Path; 34 import java.util.Iterator; 35 import java.util.NoSuchElementException; 36 37 /** 38 * 39 * @author Xueming Shen, Rajendra Gutupalli, Jaya Hangal 40 */ 41 class ZipDirectoryStream implements DirectoryStream<Path> { 42 43 private final ZipFileSystem zipfs; 44 private final ZipPath dir; 45 private final DirectoryStream.Filter<? super Path> filter; 46 private volatile boolean isClosed; 47 private volatile Iterator<Path> itr; 48 49 ZipDirectoryStream(ZipPath dir, 50 DirectoryStream.Filter<? super java.nio.file.Path> filter) 51 throws IOException 52 { 53 this.zipfs = dir.getFileSystem(); 54 this.dir = dir; 55 this.filter = filter; 56 // sanity check 57 if (!zipfs.isDirectory(dir.getResolvedPath())) 58 throw new NotDirectoryException(dir.toString()); 59 } 60 61 @Override 62 public synchronized Iterator<Path> iterator() { 63 if (isClosed) 64 throw new ClosedDirectoryStreamException(); 65 if (itr != null) 66 throw new IllegalStateException("Iterator has already been returned"); 67 68 try { 69 itr = zipfs.iteratorOf(dir, filter); 70 } catch (IOException e) { 71 throw new DirectoryIteratorException(e); 72 } 73 74 return new Iterator<Path>() { 75 @Override 76 public boolean hasNext() { 77 if (isClosed) 78 return false; 79 return itr.hasNext(); 80 } 81 82 @Override 83 public synchronized Path next() { 84 if (isClosed) 85 throw new NoSuchElementException(); 86 return itr.next(); 87 } 88 89 @Override 90 public void remove() { 91 throw new UnsupportedOperationException(); 92 } 93 }; 94 } 95 96 @Override 97 public synchronized void close() throws IOException { 98 isClosed = true; 99 } 100 }