author | alanb |
Fri, 06 Jan 2012 15:00:22 +0000 | |
changeset 11506 | 905dbb3e77eb |
parent 9035 | 1255eb81cc2f |
child 14342 | 8435a30053c1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.nio.file; |
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import java.nio.file.attribute.*; |
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import java.io.IOException; |
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import java.util.*; |
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import sun.nio.fs.BasicFileAttributesHolder; |
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/** |
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* Simple file tree walker that works in a similar manner to nftw(3C). |
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* |
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* @see Files#walkFileTree |
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*/ |
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class FileTreeWalker { |
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private final boolean followLinks; |
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private final LinkOption[] linkOptions; |
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private final FileVisitor<? super Path> visitor; |
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private final int maxDepth; |
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FileTreeWalker(Set<FileVisitOption> options, |
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FileVisitor<? super Path> visitor, |
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int maxDepth) |
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{ |
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boolean fl = false; |
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for (FileVisitOption option: options) { |
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// will throw NPE if options contains null |
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switch (option) { |
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case FOLLOW_LINKS : fl = true; break; |
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default: |
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throw new AssertionError("Should not get here"); |
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} |
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} |
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this.followLinks = fl; |
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this.linkOptions = (fl) ? new LinkOption[0] : |
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new LinkOption[] { LinkOption.NOFOLLOW_LINKS }; |
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this.visitor = visitor; |
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this.maxDepth = maxDepth; |
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} |
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/** |
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* Walk file tree starting at the given file |
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*/ |
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void walk(Path start) throws IOException { |
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FileVisitResult result = walk(start, |
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0, |
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new ArrayList<AncestorDirectory>()); |
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Objects.requireNonNull(result, "FileVisitor returned null"); |
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} |
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/** |
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* @param file |
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* the directory to visit |
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* @param depth |
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* depth remaining |
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* @param ancestors |
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* use when cycle detection is enabled |
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*/ |
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private FileVisitResult walk(Path file, |
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int depth, |
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List<AncestorDirectory> ancestors) |
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throws IOException |
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{ |
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// if attributes are cached then use them if possible |
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BasicFileAttributes attrs = null; |
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if ((depth > 0) && |
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(file instanceof BasicFileAttributesHolder) && |
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(System.getSecurityManager() == null)) |
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{ |
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BasicFileAttributes cached = ((BasicFileAttributesHolder)file).get(); |
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if (cached != null && (!followLinks || !cached.isSymbolicLink())) |
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attrs = cached; |
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} |
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IOException exc = null; |
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// attempt to get attributes of file. If fails and we are following |
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// links then a link target might not exist so get attributes of link |
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if (attrs == null) { |
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try { |
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try { |
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attrs = Files.readAttributes(file, BasicFileAttributes.class, linkOptions); |
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} catch (IOException x1) { |
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if (followLinks) { |
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try { |
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attrs = Files.readAttributes(file, |
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BasicFileAttributes.class, |
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LinkOption.NOFOLLOW_LINKS); |
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} catch (IOException x2) { |
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exc = x2; |
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} |
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} else { |
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exc = x1; |
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} |
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} |
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119 |
} catch (SecurityException x) { |
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120 |
// If access to starting file is denied then SecurityException |
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121 |
// is thrown, otherwise the file is ignored. |
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122 |
if (depth == 0) |
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123 |
throw x; |
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124 |
return FileVisitResult.CONTINUE; |
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125 |
} |
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|
126 |
} |
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|
127 |
|
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|
128 |
// unable to get attributes of file |
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|
129 |
if (exc != null) { |
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|
130 |
return visitor.visitFileFailed(file, exc); |
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|
131 |
} |
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|
132 |
|
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|
133 |
// at maximum depth or file is not a directory |
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|
134 |
if (depth >= maxDepth || !attrs.isDirectory()) { |
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|
135 |
return visitor.visitFile(file, attrs); |
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|
136 |
} |
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|
137 |
|
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|
138 |
// check for cycles when following links |
0e91810597f9
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|
139 |
if (followLinks) { |
2057
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|
140 |
Object key = attrs.fileKey(); |
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changeset
|
141 |
|
3acf8e5e2ca0
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|
142 |
// if this directory and ancestor has a file key then we compare |
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|
143 |
// them; otherwise we use less efficient isSameFile test. |
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|
144 |
for (AncestorDirectory ancestor: ancestors) { |
3acf8e5e2ca0
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|
145 |
Object ancestorKey = ancestor.fileKey(); |
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|
146 |
if (key != null && ancestorKey != null) { |
3acf8e5e2ca0
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|
147 |
if (key.equals(ancestorKey)) { |
3acf8e5e2ca0
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|
148 |
// cycle detected |
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|
149 |
return visitor.visitFileFailed(file, |
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|
150 |
new FileSystemLoopException(file.toString())); |
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|
151 |
} |
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|
152 |
} else { |
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|
153 |
boolean isSameFile = false; |
2057
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|
154 |
try { |
8158 | 155 |
isSameFile = Files.isSameFile(file, ancestor.file()); |
2057
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|
156 |
} catch (IOException x) { |
3acf8e5e2ca0
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|
157 |
// ignore |
3acf8e5e2ca0
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|
158 |
} catch (SecurityException x) { |
3acf8e5e2ca0
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changeset
|
159 |
// ignore |
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|
160 |
} |
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changeset
|
161 |
if (isSameFile) { |
0e91810597f9
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diff
changeset
|
162 |
// cycle detected |
0e91810597f9
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changeset
|
163 |
return visitor.visitFileFailed(file, |
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changeset
|
164 |
new FileSystemLoopException(file.toString())); |
0e91810597f9
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changeset
|
165 |
} |
2057
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changeset
|
166 |
} |
3acf8e5e2ca0
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parents:
diff
changeset
|
167 |
} |
3acf8e5e2ca0
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parents:
diff
changeset
|
168 |
|
3acf8e5e2ca0
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|
169 |
ancestors.add(new AncestorDirectory(file, key)); |
3acf8e5e2ca0
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parents:
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changeset
|
170 |
} |
3acf8e5e2ca0
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parents:
diff
changeset
|
171 |
|
3acf8e5e2ca0
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parents:
diff
changeset
|
172 |
// visit directory |
3acf8e5e2ca0
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changeset
|
173 |
try { |
3acf8e5e2ca0
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|
174 |
DirectoryStream<Path> stream = null; |
3acf8e5e2ca0
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diff
changeset
|
175 |
FileVisitResult result; |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
176 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
177 |
// open the directory |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
178 |
try { |
8158 | 179 |
stream = Files.newDirectoryStream(file); |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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changeset
|
180 |
} catch (IOException x) { |
6695
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diff
changeset
|
181 |
return visitor.visitFileFailed(file, x); |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
182 |
} catch (SecurityException x) { |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
183 |
// ignore, as per spec |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
184 |
return FileVisitResult.CONTINUE; |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
185 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
186 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
187 |
// the exception notified to the postVisitDirectory method |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
188 |
IOException ioe = null; |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
189 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
190 |
// invoke preVisitDirectory and then visit each entry |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
191 |
try { |
6695
0e91810597f9
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diff
changeset
|
192 |
result = visitor.preVisitDirectory(file, attrs); |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
193 |
if (result != FileVisitResult.CONTINUE) { |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
194 |
return result; |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
195 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
196 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
197 |
try { |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
198 |
for (Path entry: stream) { |
3847
821abab95d38
6876541: (file) Files.walkFileTree(...): no SecurityException if read access to the starting file is denied
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diff
changeset
|
199 |
result = walk(entry, depth+1, ancestors); |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
200 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
201 |
// returning null will cause NPE to be thrown |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
202 |
if (result == null || result == FileVisitResult.TERMINATE) |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
203 |
return result; |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
204 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
205 |
// skip remaining siblings in this directory |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
206 |
if (result == FileVisitResult.SKIP_SIBLINGS) |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
207 |
break; |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
208 |
} |
6695
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6907737: (file) FileVisitor and Files.walkFileTree issues
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diff
changeset
|
209 |
} catch (DirectoryIteratorException e) { |
0e91810597f9
6907737: (file) FileVisitor and Files.walkFileTree issues
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diff
changeset
|
210 |
// IOException will be notified to postVisitDirectory |
0e91810597f9
6907737: (file) FileVisitor and Files.walkFileTree issues
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diff
changeset
|
211 |
ioe = e.getCause(); |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
212 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
213 |
} finally { |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
214 |
try { |
3acf8e5e2ca0
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parents:
diff
changeset
|
215 |
stream.close(); |
8158 | 216 |
} catch (IOException e) { |
217 |
// IOException will be notified to postVisitDirectory |
|
218 |
if (ioe == null) |
|
219 |
ioe = e; |
|
220 |
} |
|
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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diff
changeset
|
221 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
222 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
223 |
// invoke postVisitDirectory last |
3acf8e5e2ca0
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parents:
diff
changeset
|
224 |
return visitor.postVisitDirectory(file, ioe); |
3acf8e5e2ca0
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parents:
diff
changeset
|
225 |
|
3acf8e5e2ca0
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alanb
parents:
diff
changeset
|
226 |
} finally { |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
227 |
// remove key from trail if doing cycle detection |
6695
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changeset
|
228 |
if (followLinks) { |
2057
3acf8e5e2ca0
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parents:
diff
changeset
|
229 |
ancestors.remove(ancestors.size()-1); |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
230 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
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parents:
diff
changeset
|
231 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
232 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
diff
changeset
|
233 |
|
3acf8e5e2ca0
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parents:
diff
changeset
|
234 |
private static class AncestorDirectory { |
3065
452aaa2899fc
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diff
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|
235 |
private final Path dir; |
2057
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diff
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|
236 |
private final Object key; |
3065
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diff
changeset
|
237 |
AncestorDirectory(Path dir, Object key) { |
2057
3acf8e5e2ca0
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parents:
diff
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|
238 |
this.dir = dir; |
3acf8e5e2ca0
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parents:
diff
changeset
|
239 |
this.key = key; |
3acf8e5e2ca0
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parents:
diff
changeset
|
240 |
} |
3065
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diff
changeset
|
241 |
Path file() { |
2057
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return dir; |
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} |
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Object fileKey() { |
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return key; |
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} |
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} |
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} |