1 /* 2 * Copyright (c) 2009, 2018, 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.DirectoryStream; 31 import java.nio.file.NotDirectoryException; 32 import java.nio.file.Path; 33 import java.util.Iterator; 34 import java.util.NoSuchElementException; 35 36 /** 37 * 38 * @author Xueming Shen, Rajendra Gutupalli, Jaya Hangal 39 */ 40 class ZipDirectoryStream implements DirectoryStream<Path> { 41 42 private final ZipFileSystem zipfs; 43 private final ZipPath dir; 44 private final DirectoryStream.Filter<? super Path> filter; 45 private volatile boolean isClosed; 46 private volatile Iterator<Path> itr; 47 48 ZipDirectoryStream(ZipPath dir, 49 DirectoryStream.Filter<? super java.nio.file.Path> filter) 50 throws IOException 51 { 52 this.zipfs = dir.getFileSystem(); 53 this.dir = dir; 54 this.filter = filter; 55 // sanity check 56 if (!zipfs.isDirectory(dir.getResolvedPath())) 57 throw new NotDirectoryException(dir.toString()); 58 } 59 60 @Override 61 public synchronized Iterator<Path> iterator() { 62 if (isClosed) 63 throw new ClosedDirectoryStreamException(); 64 if (itr != null) 65 throw new IllegalStateException("Iterator has already been returned"); 66 67 try { 68 itr = zipfs.iteratorOf(dir, filter); 69 } catch (IOException e) { 70 throw new IllegalStateException(e); 71 } 72 73 return new Iterator<Path>() { 74 @Override 75 public boolean hasNext() { 76 if (isClosed) 77 return false; 78 return itr.hasNext(); 79 } 80 81 @Override 82 public synchronized Path next() { 83 if (isClosed) 84 throw new NoSuchElementException(); 85 return itr.next(); 86 } 87 88 @Override 89 public void remove() { 90 throw new UnsupportedOperationException(); 91 } 92 }; 93 } 94 95 @Override 96 public synchronized void close() throws IOException { 97 isClosed = true; 98 } 99 }