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src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipDirectoryStream.java

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rev 53034 : 8215472: Cleanups in implementation classes of jdk.zipfs and tests
   1 /*
   2  * Copyright (c) 2009, 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.nio.zipfs;
  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 /**
  37  *
  38  * @author  Xueming Shen, Rajendra Gutupalli, Jaya Hangal
  39  */
  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 IllegalStateException(e);
  72         }

  73         return new Iterator<Path>() {
  74             private Path next;
  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 
 101 }
   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 }
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