--- a/jdk/src/share/demo/nio/zipfs/src/com/sun/nio/zipfs/ZipPath.java Thu Apr 17 15:23:23 2014 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,884 +0,0 @@
-/*
- * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of Oracle nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/*
- * This source code is provided to illustrate the usage of a given feature
- * or technique and has been deliberately simplified. Additional steps
- * required for a production-quality application, such as security checks,
- * input validation and proper error handling, might not be present in
- * this sample code.
- */
-
-
-package com.sun.nio.zipfs;
-
-import java.io.*;
-import java.net.URI;
-import java.nio.channels.*;
-import java.nio.file.*;
-import java.nio.file.DirectoryStream.Filter;
-import java.nio.file.attribute.*;
-import java.util.*;
-import static java.nio.file.StandardOpenOption.*;
-import static java.nio.file.StandardCopyOption.*;
-
-
-/**
- *
- * @author Xueming Shen, Rajendra Gutupalli,Jaya Hangal
- */
-
-public class ZipPath implements Path {
-
- private final ZipFileSystem zfs;
- private final byte[] path;
- private volatile int[] offsets;
- private int hashcode = 0; // cached hashcode (created lazily)
-
- ZipPath(ZipFileSystem zfs, byte[] path) {
- this(zfs, path, false);
- }
-
- ZipPath(ZipFileSystem zfs, byte[] path, boolean normalized)
- {
- this.zfs = zfs;
- if (normalized)
- this.path = path;
- else
- this.path = normalize(path);
- }
-
- @Override
- public ZipPath getRoot() {
- if (this.isAbsolute())
- return new ZipPath(zfs, new byte[]{path[0]});
- else
- return null;
- }
-
- @Override
- public Path getFileName() {
- initOffsets();
- int count = offsets.length;
- if (count == 0)
- return null; // no elements so no name
- if (count == 1 && path[0] != '/')
- return this;
- int lastOffset = offsets[count-1];
- int len = path.length - lastOffset;
- byte[] result = new byte[len];
- System.arraycopy(path, lastOffset, result, 0, len);
- return new ZipPath(zfs, result);
- }
-
- @Override
- public ZipPath getParent() {
- initOffsets();
- int count = offsets.length;
- if (count == 0) // no elements so no parent
- return null;
- int len = offsets[count-1] - 1;
- if (len <= 0) // parent is root only (may be null)
- return getRoot();
- byte[] result = new byte[len];
- System.arraycopy(path, 0, result, 0, len);
- return new ZipPath(zfs, result);
- }
-
- @Override
- public int getNameCount() {
- initOffsets();
- return offsets.length;
- }
-
- @Override
- public ZipPath getName(int index) {
- initOffsets();
- if (index < 0 || index >= offsets.length)
- throw new IllegalArgumentException();
- int begin = offsets[index];
- int len;
- if (index == (offsets.length-1))
- len = path.length - begin;
- else
- len = offsets[index+1] - begin - 1;
- // construct result
- byte[] result = new byte[len];
- System.arraycopy(path, begin, result, 0, len);
- return new ZipPath(zfs, result);
- }
-
- @Override
- public ZipPath subpath(int beginIndex, int endIndex) {
- initOffsets();
- if (beginIndex < 0 ||
- beginIndex >= offsets.length ||
- endIndex > offsets.length ||
- beginIndex >= endIndex)
- throw new IllegalArgumentException();
-
- // starting offset and length
- int begin = offsets[beginIndex];
- int len;
- if (endIndex == offsets.length)
- len = path.length - begin;
- else
- len = offsets[endIndex] - begin - 1;
- // construct result
- byte[] result = new byte[len];
- System.arraycopy(path, begin, result, 0, len);
- return new ZipPath(zfs, result);
- }
-
- @Override
- public ZipPath toRealPath(LinkOption... options) throws IOException {
- ZipPath realPath = new ZipPath(zfs, getResolvedPath()).toAbsolutePath();
- realPath.checkAccess();
- return realPath;
- }
-
- boolean isHidden() {
- return false;
- }
-
- @Override
- public ZipPath toAbsolutePath() {
- if (isAbsolute()) {
- return this;
- } else {
- //add / bofore the existing path
- byte[] defaultdir = zfs.getDefaultDir().path;
- int defaultlen = defaultdir.length;
- boolean endsWith = (defaultdir[defaultlen - 1] == '/');
- byte[] t = null;
- if (endsWith)
- t = new byte[defaultlen + path.length];
- else
- t = new byte[defaultlen + 1 + path.length];
- System.arraycopy(defaultdir, 0, t, 0, defaultlen);
- if (!endsWith)
- t[defaultlen++] = '/';
- System.arraycopy(path, 0, t, defaultlen, path.length);
- return new ZipPath(zfs, t, true); // normalized
- }
- }
-
- @Override
- public URI toUri() {
- try {
- return new URI("jar",
- zfs.getZipFile().toUri() +
- "!" +
- zfs.getString(toAbsolutePath().path),
- null);
- } catch (Exception ex) {
- throw new AssertionError(ex);
- }
- }
-
- private boolean equalsNameAt(ZipPath other, int index) {
- int mbegin = offsets[index];
- int mlen = 0;
- if (index == (offsets.length-1))
- mlen = path.length - mbegin;
- else
- mlen = offsets[index + 1] - mbegin - 1;
- int obegin = other.offsets[index];
- int olen = 0;
- if (index == (other.offsets.length - 1))
- olen = other.path.length - obegin;
- else
- olen = other.offsets[index + 1] - obegin - 1;
- if (mlen != olen)
- return false;
- int n = 0;
- while(n < mlen) {
- if (path[mbegin + n] != other.path[obegin + n])
- return false;
- n++;
- }
- return true;
- }
-
- @Override
- public Path relativize(Path other) {
- final ZipPath o = checkPath(other);
- if (o.equals(this))
- return new ZipPath(getFileSystem(), new byte[0], true);
- if (/* this.getFileSystem() != o.getFileSystem() || */
- this.isAbsolute() != o.isAbsolute()) {
- throw new IllegalArgumentException();
- }
- int mc = this.getNameCount();
- int oc = o.getNameCount();
- int n = Math.min(mc, oc);
- int i = 0;
- while (i < n) {
- if (!equalsNameAt(o, i))
- break;
- i++;
- }
- int dotdots = mc - i;
- int len = dotdots * 3 - 1;
- if (i < oc)
- len += (o.path.length - o.offsets[i] + 1);
- byte[] result = new byte[len];
-
- int pos = 0;
- while (dotdots > 0) {
- result[pos++] = (byte)'.';
- result[pos++] = (byte)'.';
- if (pos < len) // no tailing slash at the end
- result[pos++] = (byte)'/';
- dotdots--;
- }
- if (i < oc)
- System.arraycopy(o.path, o.offsets[i],
- result, pos,
- o.path.length - o.offsets[i]);
- return new ZipPath(getFileSystem(), result);
- }
-
- @Override
- public ZipFileSystem getFileSystem() {
- return zfs;
- }
-
- @Override
- public boolean isAbsolute() {
- return (this.path.length > 0 && path[0] == '/');
- }
-
- @Override
- public ZipPath resolve(Path other) {
- final ZipPath o = checkPath(other);
- if (o.isAbsolute())
- return o;
- byte[] resolved = null;
- if (this.path[path.length - 1] == '/') {
- resolved = new byte[path.length + o.path.length];
- System.arraycopy(path, 0, resolved, 0, path.length);
- System.arraycopy(o.path, 0, resolved, path.length, o.path.length);
- } else {
- resolved = new byte[path.length + 1 + o.path.length];
- System.arraycopy(path, 0, resolved, 0, path.length);
- resolved[path.length] = '/';
- System.arraycopy(o.path, 0, resolved, path.length + 1, o.path.length);
- }
- return new ZipPath(zfs, resolved);
- }
-
- @Override
- public Path resolveSibling(Path other) {
- if (other == null)
- throw new NullPointerException();
- Path parent = getParent();
- return (parent == null) ? other : parent.resolve(other);
- }
-
- @Override
- public boolean startsWith(Path other) {
- final ZipPath o = checkPath(other);
- if (o.isAbsolute() != this.isAbsolute() ||
- o.path.length > this.path.length)
- return false;
- int olast = o.path.length;
- for (int i = 0; i < olast; i++) {
- if (o.path[i] != this.path[i])
- return false;
- }
- olast--;
- return o.path.length == this.path.length ||
- o.path[olast] == '/' ||
- this.path[olast + 1] == '/';
- }
-
- @Override
- public boolean endsWith(Path other) {
- final ZipPath o = checkPath(other);
- int olast = o.path.length - 1;
- if (olast > 0 && o.path[olast] == '/')
- olast--;
- int last = this.path.length - 1;
- if (last > 0 && this.path[last] == '/')
- last--;
- if (olast == -1) // o.path.length == 0
- return last == -1;
- if ((o.isAbsolute() &&(!this.isAbsolute() || olast != last)) ||
- (last < olast))
- return false;
- for (; olast >= 0; olast--, last--) {
- if (o.path[olast] != this.path[last])
- return false;
- }
- return o.path[olast + 1] == '/' ||
- last == -1 || this.path[last] == '/';
- }
-
- @Override
- public ZipPath resolve(String other) {
- return resolve(getFileSystem().getPath(other));
- }
-
- @Override
- public final Path resolveSibling(String other) {
- return resolveSibling(getFileSystem().getPath(other));
- }
-
- @Override
- public final boolean startsWith(String other) {
- return startsWith(getFileSystem().getPath(other));
- }
-
- @Override
- public final boolean endsWith(String other) {
- return endsWith(getFileSystem().getPath(other));
- }
-
- @Override
- public Path normalize() {
- byte[] resolved = getResolved();
- if (resolved == path) // no change
- return this;
- return new ZipPath(zfs, resolved, true);
- }
-
- private ZipPath checkPath(Path path) {
- if (path == null)
- throw new NullPointerException();
- if (!(path instanceof ZipPath))
- throw new ProviderMismatchException();
- return (ZipPath) path;
- }
-
- // create offset list if not already created
- private void initOffsets() {
- if (offsets == null) {
- int count, index;
- // count names
- count = 0;
- index = 0;
- while (index < path.length) {
- byte c = path[index++];
- if (c != '/') {
- count++;
- while (index < path.length && path[index] != '/')
- index++;
- }
- }
- // populate offsets
- int[] result = new int[count];
- count = 0;
- index = 0;
- while (index < path.length) {
- byte c = path[index];
- if (c == '/') {
- index++;
- } else {
- result[count++] = index++;
- while (index < path.length && path[index] != '/')
- index++;
- }
- }
- synchronized (this) {
- if (offsets == null)
- offsets = result;
- }
- }
- }
-
- // resolved path for locating zip entry inside the zip file,
- // the result path does not contain ./ and .. components
- private volatile byte[] resolved = null;
- byte[] getResolvedPath() {
- byte[] r = resolved;
- if (r == null) {
- if (isAbsolute())
- r = getResolved();
- else
- r = toAbsolutePath().getResolvedPath();
- if (r[0] == '/')
- r = Arrays.copyOfRange(r, 1, r.length);
- resolved = r;
- }
- return resolved;
- }
-
- // removes redundant slashs, replace "\" to zip separator "/"
- // and check for invalid characters
- private byte[] normalize(byte[] path) {
- if (path.length == 0)
- return path;
- byte prevC = 0;
- for (int i = 0; i < path.length; i++) {
- byte c = path[i];
- if (c == '\\')
- return normalize(path, i);
- if (c == (byte)'/' && prevC == '/')
- return normalize(path, i - 1);
- if (c == '\u0000')
- throw new InvalidPathException(zfs.getString(path),
- "Path: nul character not allowed");
- prevC = c;
- }
- return path;
- }
-
- private byte[] normalize(byte[] path, int off) {
- byte[] to = new byte[path.length];
- int n = 0;
- while (n < off) {
- to[n] = path[n];
- n++;
- }
- int m = n;
- byte prevC = 0;
- while (n < path.length) {
- byte c = path[n++];
- if (c == (byte)'\\')
- c = (byte)'/';
- if (c == (byte)'/' && prevC == (byte)'/')
- continue;
- if (c == '\u0000')
- throw new InvalidPathException(zfs.getString(path),
- "Path: nul character not allowed");
- to[m++] = c;
- prevC = c;
- }
- if (m > 1 && to[m - 1] == '/')
- m--;
- return (m == to.length)? to : Arrays.copyOf(to, m);
- }
-
- // Remove DotSlash(./) and resolve DotDot (..) components
- private byte[] getResolved() {
- if (path.length == 0)
- return path;
- for (int i = 0; i < path.length; i++) {
- byte c = path[i];
- if (c == (byte)'.')
- return resolve0();
- }
- return path;
- }
-
- // TBD: performance, avoid initOffsets
- private byte[] resolve0() {
- byte[] to = new byte[path.length];
- int nc = getNameCount();
- int[] lastM = new int[nc];
- int lastMOff = -1;
- int m = 0;
- for (int i = 0; i < nc; i++) {
- int n = offsets[i];
- int len = (i == offsets.length - 1)?
- (path.length - n):(offsets[i + 1] - n - 1);
- if (len == 1 && path[n] == (byte)'.') {
- if (m == 0 && path[0] == '/') // absolute path
- to[m++] = '/';
- continue;
- }
- if (len == 2 && path[n] == '.' && path[n + 1] == '.') {
- if (lastMOff >= 0) {
- m = lastM[lastMOff--]; // retreat
- continue;
- }
- if (path[0] == '/') { // "/../xyz" skip
- if (m == 0)
- to[m++] = '/';
- } else { // "../xyz" -> "../xyz"
- if (m != 0 && to[m-1] != '/')
- to[m++] = '/';
- while (len-- > 0)
- to[m++] = path[n++];
- }
- continue;
- }
- if (m == 0 && path[0] == '/' || // absolute path
- m != 0 && to[m-1] != '/') { // not the first name
- to[m++] = '/';
- }
- lastM[++lastMOff] = m;
- while (len-- > 0)
- to[m++] = path[n++];
- }
- if (m > 1 && to[m - 1] == '/')
- m--;
- return (m == to.length)? to : Arrays.copyOf(to, m);
- }
-
- @Override
- public String toString() {
- return zfs.getString(path);
- }
-
- @Override
- public int hashCode() {
- int h = hashcode;
- if (h == 0)
- hashcode = h = Arrays.hashCode(path);
- return h;
- }
-
- @Override
- public boolean equals(Object obj) {
- return obj != null &&
- obj instanceof ZipPath &&
- this.zfs == ((ZipPath)obj).zfs &&
- compareTo((Path) obj) == 0;
- }
-
- @Override
- public int compareTo(Path other) {
- final ZipPath o = checkPath(other);
- int len1 = this.path.length;
- int len2 = o.path.length;
-
- int n = Math.min(len1, len2);
- byte v1[] = this.path;
- byte v2[] = o.path;
-
- int k = 0;
- while (k < n) {
- int c1 = v1[k] & 0xff;
- int c2 = v2[k] & 0xff;
- if (c1 != c2)
- return c1 - c2;
- k++;
- }
- return len1 - len2;
- }
-
- public WatchKey register(
- WatchService watcher,
- WatchEvent.Kind<?>[] events,
- WatchEvent.Modifier... modifiers) {
- if (watcher == null || events == null || modifiers == null) {
- throw new NullPointerException();
- }
- throw new UnsupportedOperationException();
- }
-
- @Override
- public WatchKey register(WatchService watcher, WatchEvent.Kind<?>... events) {
- return register(watcher, events, new WatchEvent.Modifier[0]);
- }
-
- @Override
- public final File toFile() {
- throw new UnsupportedOperationException();
- }
-
- @Override
- public Iterator<Path> iterator() {
- return new Iterator<Path>() {
- private int i = 0;
-
- @Override
- public boolean hasNext() {
- return (i < getNameCount());
- }
-
- @Override
- public Path next() {
- if (i < getNameCount()) {
- Path result = getName(i);
- i++;
- return result;
- } else {
- throw new NoSuchElementException();
- }
- }
-
- @Override
- public void remove() {
- throw new ReadOnlyFileSystemException();
- }
- };
- }
-
- /////////////////////////////////////////////////////////////////////
-
-
- void createDirectory(FileAttribute<?>... attrs)
- throws IOException
- {
- zfs.createDirectory(getResolvedPath(), attrs);
- }
-
- InputStream newInputStream(OpenOption... options) throws IOException
- {
- if (options.length > 0) {
- for (OpenOption opt : options) {
- if (opt != READ)
- throw new UnsupportedOperationException("'" + opt + "' not allowed");
- }
- }
- return zfs.newInputStream(getResolvedPath());
- }
-
- DirectoryStream<Path> newDirectoryStream(Filter<? super Path> filter)
- throws IOException
- {
- return new ZipDirectoryStream(this, filter);
- }
-
- void delete() throws IOException {
- zfs.deleteFile(getResolvedPath(), true);
- }
-
- void deleteIfExists() throws IOException {
- zfs.deleteFile(getResolvedPath(), false);
- }
-
- ZipFileAttributes getAttributes() throws IOException
- {
- ZipFileAttributes zfas = zfs.getFileAttributes(getResolvedPath());
- if (zfas == null)
- throw new NoSuchFileException(toString());
- return zfas;
- }
-
- void setAttribute(String attribute, Object value, LinkOption... options)
- throws IOException
- {
- String type = null;
- String attr = null;
- int colonPos = attribute.indexOf(':');
- if (colonPos == -1) {
- type = "basic";
- attr = attribute;
- } else {
- type = attribute.substring(0, colonPos++);
- attr = attribute.substring(colonPos);
- }
- ZipFileAttributeView view = ZipFileAttributeView.get(this, type);
- if (view == null)
- throw new UnsupportedOperationException("view <" + view + "> is not supported");
- view.setAttribute(attr, value);
- }
-
- void setTimes(FileTime mtime, FileTime atime, FileTime ctime)
- throws IOException
- {
- zfs.setTimes(getResolvedPath(), mtime, atime, ctime);
- }
-
- Map<String, Object> readAttributes(String attributes, LinkOption... options)
- throws IOException
-
- {
- String view = null;
- String attrs = null;
- int colonPos = attributes.indexOf(':');
- if (colonPos == -1) {
- view = "basic";
- attrs = attributes;
- } else {
- view = attributes.substring(0, colonPos++);
- attrs = attributes.substring(colonPos);
- }
- ZipFileAttributeView zfv = ZipFileAttributeView.get(this, view);
- if (zfv == null) {
- throw new UnsupportedOperationException("view not supported");
- }
- return zfv.readAttributes(attrs);
- }
-
- FileStore getFileStore() throws IOException {
- // each ZipFileSystem only has one root (as requested for now)
- if (exists())
- return zfs.getFileStore(this);
- throw new NoSuchFileException(zfs.getString(path));
- }
-
- boolean isSameFile(Path other) throws IOException {
- if (this.equals(other))
- return true;
- if (other == null ||
- this.getFileSystem() != other.getFileSystem())
- return false;
- this.checkAccess();
- ((ZipPath)other).checkAccess();
- return Arrays.equals(this.getResolvedPath(),
- ((ZipPath)other).getResolvedPath());
- }
-
- SeekableByteChannel newByteChannel(Set<? extends OpenOption> options,
- FileAttribute<?>... attrs)
- throws IOException
- {
- return zfs.newByteChannel(getResolvedPath(), options, attrs);
- }
-
-
- FileChannel newFileChannel(Set<? extends OpenOption> options,
- FileAttribute<?>... attrs)
- throws IOException
- {
- return zfs.newFileChannel(getResolvedPath(), options, attrs);
- }
-
- void checkAccess(AccessMode... modes) throws IOException {
- boolean w = false;
- boolean x = false;
- for (AccessMode mode : modes) {
- switch (mode) {
- case READ:
- break;
- case WRITE:
- w = true;
- break;
- case EXECUTE:
- x = true;
- break;
- default:
- throw new UnsupportedOperationException();
- }
- }
- ZipFileAttributes attrs = zfs.getFileAttributes(getResolvedPath());
- if (attrs == null && (path.length != 1 || path[0] != '/'))
- throw new NoSuchFileException(toString());
- if (w) {
- if (zfs.isReadOnly())
- throw new AccessDeniedException(toString());
- }
- if (x)
- throw new AccessDeniedException(toString());
- }
-
- boolean exists() {
- if (path.length == 1 && path[0] == '/')
- return true;
- try {
- return zfs.exists(getResolvedPath());
- } catch (IOException x) {}
- return false;
- }
-
- OutputStream newOutputStream(OpenOption... options) throws IOException
- {
- if (options.length == 0)
- return zfs.newOutputStream(getResolvedPath(),
- CREATE_NEW, WRITE);
- return zfs.newOutputStream(getResolvedPath(), options);
- }
-
- void move(ZipPath target, CopyOption... options)
- throws IOException
- {
- if (Files.isSameFile(this.zfs.getZipFile(), target.zfs.getZipFile()))
- {
- zfs.copyFile(true,
- getResolvedPath(), target.getResolvedPath(),
- options);
- } else {
- copyToTarget(target, options);
- delete();
- }
- }
-
- void copy(ZipPath target, CopyOption... options)
- throws IOException
- {
- if (Files.isSameFile(this.zfs.getZipFile(), target.zfs.getZipFile()))
- zfs.copyFile(false,
- getResolvedPath(), target.getResolvedPath(),
- options);
- else
- copyToTarget(target, options);
- }
-
- private void copyToTarget(ZipPath target, CopyOption... options)
- throws IOException
- {
- boolean replaceExisting = false;
- boolean copyAttrs = false;
- for (CopyOption opt : options) {
- if (opt == REPLACE_EXISTING)
- replaceExisting = true;
- else if (opt == COPY_ATTRIBUTES)
- copyAttrs = true;
- }
- // attributes of source file
- ZipFileAttributes zfas = getAttributes();
- // check if target exists
- boolean exists;
- if (replaceExisting) {
- try {
- target.deleteIfExists();
- exists = false;
- } catch (DirectoryNotEmptyException x) {
- exists = true;
- }
- } else {
- exists = target.exists();
- }
- if (exists)
- throw new FileAlreadyExistsException(target.toString());
-
- if (zfas.isDirectory()) {
- // create directory or file
- target.createDirectory();
- } else {
- InputStream is = zfs.newInputStream(getResolvedPath());
- try {
- OutputStream os = target.newOutputStream();
- try {
- byte[] buf = new byte[8192];
- int n = 0;
- while ((n = is.read(buf)) != -1) {
- os.write(buf, 0, n);
- }
- } finally {
- os.close();
- }
- } finally {
- is.close();
- }
- }
- if (copyAttrs) {
- BasicFileAttributeView view =
- ZipFileAttributeView.get(target, BasicFileAttributeView.class);
- try {
- view.setTimes(zfas.lastModifiedTime(),
- zfas.lastAccessTime(),
- zfas.creationTime());
- } catch (IOException x) {
- // rollback?
- try {
- target.delete();
- } catch (IOException ignore) { }
- throw x;
- }
- }
- }
-}