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Java example source code file (JavacFileManager.java)
This example Java source code file (JavacFileManager.java) is included in the alvinalexander.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn
Java by Example" TM.
Learn more about this Java project at its project page.
The JavacFileManager.java Java example source code
/*
* Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.javac.file;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.zip.ZipFile;
import javax.lang.model.SourceVersion;
import javax.tools.FileObject;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import com.sun.tools.javac.file.RelativePath.RelativeFile;
import com.sun.tools.javac.file.RelativePath.RelativeDirectory;
import com.sun.tools.javac.util.BaseFileManager;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.ListBuffer;
import static javax.tools.StandardLocation.*;
/**
* This class provides access to the source, class and other files
* used by the compiler and related tools.
*
* <p>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class JavacFileManager extends BaseFileManager implements StandardJavaFileManager {
public static char[] toArray(CharBuffer buffer) {
if (buffer.hasArray())
return ((CharBuffer)buffer.compact().flip()).array();
else
return buffer.toString().toCharArray();
}
private FSInfo fsInfo;
private boolean contextUseOptimizedZip;
private ZipFileIndexCache zipFileIndexCache;
private final Set<JavaFileObject.Kind> sourceOrClass =
EnumSet.of(JavaFileObject.Kind.SOURCE, JavaFileObject.Kind.CLASS);
protected boolean mmappedIO;
protected boolean symbolFileEnabled;
protected enum SortFiles implements Comparator<File> {
FORWARD {
public int compare(File f1, File f2) {
return f1.getName().compareTo(f2.getName());
}
},
REVERSE {
public int compare(File f1, File f2) {
return -f1.getName().compareTo(f2.getName());
}
};
};
protected SortFiles sortFiles;
/**
* Register a Context.Factory to create a JavacFileManager.
*/
public static void preRegister(Context context) {
context.put(JavaFileManager.class, new Context.Factory<JavaFileManager>() {
public JavaFileManager make(Context c) {
return new JavacFileManager(c, true, null);
}
});
}
/**
* Create a JavacFileManager using a given context, optionally registering
* it as the JavaFileManager for that context.
*/
public JavacFileManager(Context context, boolean register, Charset charset) {
super(charset);
if (register)
context.put(JavaFileManager.class, this);
setContext(context);
}
/**
* Set the context for JavacFileManager.
*/
@Override
public void setContext(Context context) {
super.setContext(context);
fsInfo = FSInfo.instance(context);
contextUseOptimizedZip = options.getBoolean("useOptimizedZip", true);
if (contextUseOptimizedZip)
zipFileIndexCache = ZipFileIndexCache.getSharedInstance();
mmappedIO = options.isSet("mmappedIO");
symbolFileEnabled = !options.isSet("ignore.symbol.file");
String sf = options.get("sortFiles");
if (sf != null) {
sortFiles = (sf.equals("reverse") ? SortFiles.REVERSE : SortFiles.FORWARD);
}
}
/**
* Set whether or not to use ct.sym as an alternate to rt.jar.
*/
public void setSymbolFileEnabled(boolean b) {
symbolFileEnabled = b;
}
@Override
public boolean isDefaultBootClassPath() {
return locations.isDefaultBootClassPath();
}
public JavaFileObject getFileForInput(String name) {
return getRegularFile(new File(name));
}
public JavaFileObject getRegularFile(File file) {
return new RegularFileObject(this, file);
}
public JavaFileObject getFileForOutput(String classname,
JavaFileObject.Kind kind,
JavaFileObject sibling)
throws IOException
{
return getJavaFileForOutput(CLASS_OUTPUT, classname, kind, sibling);
}
public Iterable<? extends JavaFileObject> getJavaFileObjectsFromStrings(Iterable names) {
ListBuffer<File> files = new ListBuffer();
for (String name : names)
files.append(new File(nullCheck(name)));
return getJavaFileObjectsFromFiles(files.toList());
}
public Iterable<? extends JavaFileObject> getJavaFileObjects(String... names) {
return getJavaFileObjectsFromStrings(Arrays.asList(nullCheck(names)));
}
private static boolean isValidName(String name) {
// Arguably, isValidName should reject keywords (such as in SourceVersion.isName() ),
// but the set of keywords depends on the source level, and we don't want
// impls of JavaFileManager to have to be dependent on the source level.
// Therefore we simply check that the argument is a sequence of identifiers
// separated by ".".
for (String s : name.split("\\.", -1)) {
if (!SourceVersion.isIdentifier(s))
return false;
}
return true;
}
private static void validateClassName(String className) {
if (!isValidName(className))
throw new IllegalArgumentException("Invalid class name: " + className);
}
private static void validatePackageName(String packageName) {
if (packageName.length() > 0 && !isValidName(packageName))
throw new IllegalArgumentException("Invalid packageName name: " + packageName);
}
public static void testName(String name,
boolean isValidPackageName,
boolean isValidClassName)
{
try {
validatePackageName(name);
if (!isValidPackageName)
throw new AssertionError("Invalid package name accepted: " + name);
printAscii("Valid package name: \"%s\"", name);
} catch (IllegalArgumentException e) {
if (isValidPackageName)
throw new AssertionError("Valid package name rejected: " + name);
printAscii("Invalid package name: \"%s\"", name);
}
try {
validateClassName(name);
if (!isValidClassName)
throw new AssertionError("Invalid class name accepted: " + name);
printAscii("Valid class name: \"%s\"", name);
} catch (IllegalArgumentException e) {
if (isValidClassName)
throw new AssertionError("Valid class name rejected: " + name);
printAscii("Invalid class name: \"%s\"", name);
}
}
private static void printAscii(String format, Object... args) {
String message;
try {
final String ascii = "US-ASCII";
message = new String(String.format(null, format, args).getBytes(ascii), ascii);
} catch (java.io.UnsupportedEncodingException ex) {
throw new AssertionError(ex);
}
System.out.println(message);
}
/**
* Insert all files in subdirectory subdirectory of directory directory
* which match fileKinds into resultList
*/
private void listDirectory(File directory,
RelativeDirectory subdirectory,
Set<JavaFileObject.Kind> fileKinds,
boolean recurse,
ListBuffer<JavaFileObject> resultList) {
File d = subdirectory.getFile(directory);
if (!caseMapCheck(d, subdirectory))
return;
File[] files = d.listFiles();
if (files == null)
return;
if (sortFiles != null)
Arrays.sort(files, sortFiles);
for (File f: files) {
String fname = f.getName();
if (f.isDirectory()) {
if (recurse && SourceVersion.isIdentifier(fname)) {
listDirectory(directory,
new RelativeDirectory(subdirectory, fname),
fileKinds,
recurse,
resultList);
}
} else {
if (isValidFile(fname, fileKinds)) {
JavaFileObject fe =
new RegularFileObject(this, fname, new File(d, fname));
resultList.append(fe);
}
}
}
}
/**
* Insert all files in subdirectory subdirectory of archive archive
* which match fileKinds into resultList
*/
private void listArchive(Archive archive,
RelativeDirectory subdirectory,
Set<JavaFileObject.Kind> fileKinds,
boolean recurse,
ListBuffer<JavaFileObject> resultList) {
// Get the files directly in the subdir
List<String> files = archive.getFiles(subdirectory);
if (files != null) {
for (; !files.isEmpty(); files = files.tail) {
String file = files.head;
if (isValidFile(file, fileKinds)) {
resultList.append(archive.getFileObject(subdirectory, file));
}
}
}
if (recurse) {
for (RelativeDirectory s: archive.getSubdirectories()) {
if (subdirectory.contains(s)) {
// Because the archive map is a flat list of directories,
// the enclosing loop will pick up all child subdirectories.
// Therefore, there is no need to recurse deeper.
listArchive(archive, s, fileKinds, false, resultList);
}
}
}
}
/**
* container is a directory, a zip file, or a non-existant path.
* Insert all files in subdirectory subdirectory of container which
* match fileKinds into resultList
*/
private void listContainer(File container,
RelativeDirectory subdirectory,
Set<JavaFileObject.Kind> fileKinds,
boolean recurse,
ListBuffer<JavaFileObject> resultList) {
Archive archive = archives.get(container);
if (archive == null) {
// archives are not created for directories.
if (fsInfo.isDirectory(container)) {
listDirectory(container,
subdirectory,
fileKinds,
recurse,
resultList);
return;
}
// Not a directory; either a file or non-existant, create the archive
try {
archive = openArchive(container);
} catch (IOException ex) {
log.error("error.reading.file",
container, getMessage(ex));
return;
}
}
listArchive(archive,
subdirectory,
fileKinds,
recurse,
resultList);
}
private boolean isValidFile(String s, Set<JavaFileObject.Kind> fileKinds) {
JavaFileObject.Kind kind = getKind(s);
return fileKinds.contains(kind);
}
private static final boolean fileSystemIsCaseSensitive =
File.separatorChar == '/';
/** Hack to make Windows case sensitive. Test whether given path
* ends in a string of characters with the same case as given name.
* Ignore file separators in both path and name.
*/
private boolean caseMapCheck(File f, RelativePath name) {
if (fileSystemIsCaseSensitive) return true;
// Note that getCanonicalPath() returns the case-sensitive
// spelled file name.
String path;
try {
path = f.getCanonicalPath();
} catch (IOException ex) {
return false;
}
char[] pcs = path.toCharArray();
char[] ncs = name.path.toCharArray();
int i = pcs.length - 1;
int j = ncs.length - 1;
while (i >= 0 && j >= 0) {
while (i >= 0 && pcs[i] == File.separatorChar) i--;
while (j >= 0 && ncs[j] == '/') j--;
if (i >= 0 && j >= 0) {
if (pcs[i] != ncs[j]) return false;
i--;
j--;
}
}
return j < 0;
}
/**
* An archive provides a flat directory structure of a ZipFile by
* mapping directory names to lists of files (basenames).
*/
public interface Archive {
void close() throws IOException;
boolean contains(RelativePath name);
JavaFileObject getFileObject(RelativeDirectory subdirectory, String file);
List<String> getFiles(RelativeDirectory subdirectory);
Set<RelativeDirectory> getSubdirectories();
}
public class MissingArchive implements Archive {
final File zipFileName;
public MissingArchive(File name) {
zipFileName = name;
}
public boolean contains(RelativePath name) {
return false;
}
public void close() {
}
public JavaFileObject getFileObject(RelativeDirectory subdirectory, String file) {
return null;
}
public List<String> getFiles(RelativeDirectory subdirectory) {
return List.nil();
}
public Set<RelativeDirectory> getSubdirectories() {
return Collections.emptySet();
}
@Override
public String toString() {
return "MissingArchive[" + zipFileName + "]";
}
}
/** A directory of zip files already opened.
*/
Map<File, Archive> archives = new HashMap();
private static final String[] symbolFileLocation = { "lib", "ct.sym" };
private static final RelativeDirectory symbolFilePrefix
= new RelativeDirectory("META-INF/sym/rt.jar/");
/*
* This method looks for a ZipFormatException and takes appropriate
* evasive action. If there is a failure in the fast mode then we
* fail over to the platform zip, and allow it to deal with a potentially
* non compliant zip file.
*/
protected Archive openArchive(File zipFilename) throws IOException {
try {
return openArchive(zipFilename, contextUseOptimizedZip);
} catch (IOException ioe) {
if (ioe instanceof ZipFileIndex.ZipFormatException) {
return openArchive(zipFilename, false);
} else {
throw ioe;
}
}
}
/** Open a new zip file directory, and cache it.
*/
private Archive openArchive(File zipFileName, boolean useOptimizedZip) throws IOException {
File origZipFileName = zipFileName;
if (symbolFileEnabled && locations.isDefaultBootClassPathRtJar(zipFileName)) {
File file = zipFileName.getParentFile().getParentFile(); // ${java.home}
if (new File(file.getName()).equals(new File("jre")))
file = file.getParentFile();
// file == ${jdk.home}
for (String name : symbolFileLocation)
file = new File(file, name);
// file == ${jdk.home}/lib/ct.sym
if (file.exists())
zipFileName = file;
}
Archive archive;
try {
ZipFile zdir = null;
boolean usePreindexedCache = false;
String preindexCacheLocation = null;
if (!useOptimizedZip) {
zdir = new ZipFile(zipFileName);
} else {
usePreindexedCache = options.isSet("usezipindex");
preindexCacheLocation = options.get("java.io.tmpdir");
String optCacheLoc = options.get("cachezipindexdir");
if (optCacheLoc != null && optCacheLoc.length() != 0) {
if (optCacheLoc.startsWith("\"")) {
if (optCacheLoc.endsWith("\"")) {
optCacheLoc = optCacheLoc.substring(1, optCacheLoc.length() - 1);
}
else {
optCacheLoc = optCacheLoc.substring(1);
}
}
File cacheDir = new File(optCacheLoc);
if (cacheDir.exists() && cacheDir.canWrite()) {
preindexCacheLocation = optCacheLoc;
if (!preindexCacheLocation.endsWith("/") &&
!preindexCacheLocation.endsWith(File.separator)) {
preindexCacheLocation += File.separator;
}
}
}
}
if (origZipFileName == zipFileName) {
if (!useOptimizedZip) {
archive = new ZipArchive(this, zdir);
} else {
archive = new ZipFileIndexArchive(this,
zipFileIndexCache.getZipFileIndex(zipFileName,
null,
usePreindexedCache,
preindexCacheLocation,
options.isSet("writezipindexfiles")));
}
} else {
if (!useOptimizedZip) {
archive = new SymbolArchive(this, origZipFileName, zdir, symbolFilePrefix);
} else {
archive = new ZipFileIndexArchive(this,
zipFileIndexCache.getZipFileIndex(zipFileName,
symbolFilePrefix,
usePreindexedCache,
preindexCacheLocation,
options.isSet("writezipindexfiles")));
}
}
} catch (FileNotFoundException ex) {
archive = new MissingArchive(zipFileName);
} catch (ZipFileIndex.ZipFormatException zfe) {
throw zfe;
} catch (IOException ex) {
if (zipFileName.exists())
log.error("error.reading.file", zipFileName, getMessage(ex));
archive = new MissingArchive(zipFileName);
}
archives.put(origZipFileName, archive);
return archive;
}
/** Flush any output resources.
*/
public void flush() {
contentCache.clear();
}
/**
* Close the JavaFileManager, releasing resources.
*/
public void close() {
for (Iterator<Archive> i = archives.values().iterator(); i.hasNext(); ) {
Archive a = i.next();
i.remove();
try {
a.close();
} catch (IOException e) {
}
}
}
private String defaultEncodingName;
private String getDefaultEncodingName() {
if (defaultEncodingName == null) {
defaultEncodingName =
new OutputStreamWriter(new ByteArrayOutputStream()).getEncoding();
}
return defaultEncodingName;
}
public ClassLoader getClassLoader(Location location) {
nullCheck(location);
Iterable<? extends File> path = getLocation(location);
if (path == null)
return null;
ListBuffer<URL> lb = new ListBuffer();
for (File f: path) {
try {
lb.append(f.toURI().toURL());
} catch (MalformedURLException e) {
throw new AssertionError(e);
}
}
return getClassLoader(lb.toArray(new URL[lb.size()]));
}
public Iterable<JavaFileObject> list(Location location,
String packageName,
Set<JavaFileObject.Kind> kinds,
boolean recurse)
throws IOException
{
// validatePackageName(packageName);
nullCheck(packageName);
nullCheck(kinds);
Iterable<? extends File> path = getLocation(location);
if (path == null)
return List.nil();
RelativeDirectory subdirectory = RelativeDirectory.forPackage(packageName);
ListBuffer<JavaFileObject> results = new ListBuffer();
for (File directory : path)
listContainer(directory, subdirectory, kinds, recurse, results);
return results.toList();
}
public String inferBinaryName(Location location, JavaFileObject file) {
file.getClass(); // null check
location.getClass(); // null check
// Need to match the path semantics of list(location, ...)
Iterable<? extends File> path = getLocation(location);
if (path == null) {
return null;
}
if (file instanceof BaseFileObject) {
return ((BaseFileObject) file).inferBinaryName(path);
} else
throw new IllegalArgumentException(file.getClass().getName());
}
public boolean isSameFile(FileObject a, FileObject b) {
nullCheck(a);
nullCheck(b);
if (!(a instanceof BaseFileObject))
throw new IllegalArgumentException("Not supported: " + a);
if (!(b instanceof BaseFileObject))
throw new IllegalArgumentException("Not supported: " + b);
return a.equals(b);
}
public boolean hasLocation(Location location) {
return getLocation(location) != null;
}
public JavaFileObject getJavaFileForInput(Location location,
String className,
JavaFileObject.Kind kind)
throws IOException
{
nullCheck(location);
// validateClassName(className);
nullCheck(className);
nullCheck(kind);
if (!sourceOrClass.contains(kind))
throw new IllegalArgumentException("Invalid kind: " + kind);
return getFileForInput(location, RelativeFile.forClass(className, kind));
}
public FileObject getFileForInput(Location location,
String packageName,
String relativeName)
throws IOException
{
nullCheck(location);
// validatePackageName(packageName);
nullCheck(packageName);
if (!isRelativeUri(relativeName))
throw new IllegalArgumentException("Invalid relative name: " + relativeName);
RelativeFile name = packageName.length() == 0
? new RelativeFile(relativeName)
: new RelativeFile(RelativeDirectory.forPackage(packageName), relativeName);
return getFileForInput(location, name);
}
private JavaFileObject getFileForInput(Location location, RelativeFile name) throws IOException {
Iterable<? extends File> path = getLocation(location);
if (path == null)
return null;
for (File dir: path) {
Archive a = archives.get(dir);
if (a == null) {
if (fsInfo.isDirectory(dir)) {
File f = name.getFile(dir);
if (f.exists())
return new RegularFileObject(this, f);
continue;
}
// Not a directory, create the archive
a = openArchive(dir);
}
// Process the archive
if (a.contains(name)) {
return a.getFileObject(name.dirname(), name.basename());
}
}
return null;
}
public JavaFileObject getJavaFileForOutput(Location location,
String className,
JavaFileObject.Kind kind,
FileObject sibling)
throws IOException
{
nullCheck(location);
// validateClassName(className);
nullCheck(className);
nullCheck(kind);
if (!sourceOrClass.contains(kind))
throw new IllegalArgumentException("Invalid kind: " + kind);
return getFileForOutput(location, RelativeFile.forClass(className, kind), sibling);
}
public FileObject getFileForOutput(Location location,
String packageName,
String relativeName,
FileObject sibling)
throws IOException
{
nullCheck(location);
// validatePackageName(packageName);
nullCheck(packageName);
if (!isRelativeUri(relativeName))
throw new IllegalArgumentException("Invalid relative name: " + relativeName);
RelativeFile name = packageName.length() == 0
? new RelativeFile(relativeName)
: new RelativeFile(RelativeDirectory.forPackage(packageName), relativeName);
return getFileForOutput(location, name, sibling);
}
private JavaFileObject getFileForOutput(Location location,
RelativeFile fileName,
FileObject sibling)
throws IOException
{
File dir;
if (location == CLASS_OUTPUT) {
if (getClassOutDir() != null) {
dir = getClassOutDir();
} else {
File siblingDir = null;
if (sibling != null && sibling instanceof RegularFileObject) {
siblingDir = ((RegularFileObject)sibling).file.getParentFile();
}
return new RegularFileObject(this, new File(siblingDir, fileName.basename()));
}
} else if (location == SOURCE_OUTPUT) {
dir = (getSourceOutDir() != null ? getSourceOutDir() : getClassOutDir());
} else {
Iterable<? extends File> path = locations.getLocation(location);
dir = null;
for (File f: path) {
dir = f;
break;
}
}
File file = fileName.getFile(dir); // null-safe
return new RegularFileObject(this, file);
}
public Iterable<? extends JavaFileObject> getJavaFileObjectsFromFiles(
Iterable<? extends File> files)
{
ArrayList<RegularFileObject> result;
if (files instanceof Collection<?>)
result = new ArrayList<RegularFileObject>(((Collection)files).size());
else
result = new ArrayList<RegularFileObject>();
for (File f: files)
result.add(new RegularFileObject(this, nullCheck(f)));
return result;
}
public Iterable<? extends JavaFileObject> getJavaFileObjects(File... files) {
return getJavaFileObjectsFromFiles(Arrays.asList(nullCheck(files)));
}
public void setLocation(Location location,
Iterable<? extends File> path)
throws IOException
{
nullCheck(location);
locations.setLocation(location, path);
}
public Iterable<? extends File> getLocation(Location location) {
nullCheck(location);
return locations.getLocation(location);
}
private File getClassOutDir() {
return locations.getOutputLocation(CLASS_OUTPUT);
}
private File getSourceOutDir() {
return locations.getOutputLocation(SOURCE_OUTPUT);
}
/**
* Enforces the specification of a "relative" name as used in
* {@linkplain #getFileForInput(Location,String,String)
* getFileForInput}. This method must follow the rules defined in
* that method, do not make any changes without consulting the
* specification.
*/
protected static boolean isRelativeUri(URI uri) {
if (uri.isAbsolute())
return false;
String path = uri.normalize().getPath();
if (path.length() == 0 /* isEmpty() is mustang API */)
return false;
if (!path.equals(uri.getPath())) // implicitly checks for embedded . and ..
return false;
if (path.startsWith("/") || path.startsWith("./") || path.startsWith("../"))
return false;
return true;
}
// Convenience method
protected static boolean isRelativeUri(String u) {
try {
return isRelativeUri(new URI(u));
} catch (URISyntaxException e) {
return false;
}
}
/**
* Converts a relative file name to a relative URI. This is
* different from File.toURI as this method does not canonicalize
* the file before creating the URI. Furthermore, no schema is
* used.
* @param file a relative file name
* @return a relative URI
* @throws IllegalArgumentException if the file name is not
* relative according to the definition given in {@link
* javax.tools.JavaFileManager#getFileForInput}
*/
public static String getRelativeName(File file) {
if (!file.isAbsolute()) {
String result = file.getPath().replace(File.separatorChar, '/');
if (isRelativeUri(result))
return result;
}
throw new IllegalArgumentException("Invalid relative path: " + file);
}
/**
* Get a detail message from an IOException.
* Most, but not all, instances of IOException provide a non-null result
* for getLocalizedMessage(). But some instances return null: in these
* cases, fallover to getMessage(), and if even that is null, return the
* name of the exception itself.
* @param e an IOException
* @return a string to include in a compiler diagnostic
*/
public static String getMessage(IOException e) {
String s = e.getLocalizedMessage();
if (s != null)
return s;
s = e.getMessage();
if (s != null)
return s;
return e.toString();
}
}
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