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 }