/*
* Copyright (c) 2005, 2011, 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.util.Comparator;
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.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.main.OptionName;
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.*;
import static com.sun.tools.javac.main.OptionName.*;
/**
* This class provides access to the source, class and other files
* used by the compiler and related tools.
*
* <p><b>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();
}
/** Encapsulates knowledge of paths
*/
private Paths paths;
private FSInfo fsInfo;
private boolean contextUseOptimizedZip;
private ZipFileIndexCache zipFileIndexCache;
private final File uninited = new File("U N I N I T E D");
private final Set<JavaFileObject.Kind> sourceOrClass =
EnumSet.of(JavaFileObject.Kind.SOURCE, JavaFileObject.Kind.CLASS);
/** The standard output directory, primarily used for classes.
* Initialized by the "-d" option.
* If classOutDir = null, files are written into same directory as the sources
* they were generated from.
*/
private File classOutDir = uninited;
/** The output directory, used when generating sources while processing annotations.
* Initialized by the "-s" option.
*/
private File sourceOutDir = uninited;
protected boolean mmappedIO;
protected boolean ignoreSymbolFile;
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);
if (paths == null) {
paths = Paths.instance(context);
} else {
// Reuse the Paths object as it stores the locations that
// have been set with setLocation, etc.
paths.setContext(context);
}
fsInfo = FSInfo.instance(context);
contextUseOptimizedZip = options.getBoolean("useOptimizedZip", true);
if (contextUseOptimizedZip)
zipFileIndexCache = ZipFileIndexCache.getSharedInstance();
mmappedIO = options.isSet("mmappedIO");
ignoreSymbolFile = options.isSet("ignore.symbol.file");
String sf = options.get("sortFiles");
if (sf != null) {
sortFiles = (sf.equals("reverse") ? SortFiles.REVERSE : SortFiles.FORWARD);
}
}
@Override
public boolean isDefaultBootClassPath() {
return paths.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<String> names) {
ListBuffer<File> files = new ListBuffer<File>();
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<File,Archive>();
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 (!ignoreSymbolFile && paths.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<URL>();
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<JavaFileObject>();
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 = paths.getPathForLocation(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);
paths.lazy();
final File dir = location.isOutputLocation() ? getOutputDirectory(path) : null;
if (location == CLASS_OUTPUT)
classOutDir = getOutputLocation(dir, D);
else if (location == SOURCE_OUTPUT)
sourceOutDir = getOutputLocation(dir, S);
else
paths.setPathForLocation(location, path);
}
// where
private File getOutputDirectory(Iterable<? extends File> path) throws IOException {
if (path == null)
return null;
Iterator<? extends File> pathIter = path.iterator();
if (!pathIter.hasNext())
throw new IllegalArgumentException("empty path for directory");
File dir = pathIter.next();
if (pathIter.hasNext())
throw new IllegalArgumentException("path too long for directory");
if (!dir.exists())
throw new FileNotFoundException(dir + ": does not exist");
else if (!dir.isDirectory())
throw new IOException(dir + ": not a directory");
return dir;
}
private File getOutputLocation(File dir, OptionName defaultOptionName) {
if (dir != null)
return dir;
String arg = options.get(defaultOptionName);
if (arg == null)
return null;
return new File(arg);
}
public Iterable<? extends File> getLocation(Location location) {
nullCheck(location);
paths.lazy();
if (location == CLASS_OUTPUT) {
return (getClassOutDir() == null ? null : List.of(getClassOutDir()));
} else if (location == SOURCE_OUTPUT) {
return (getSourceOutDir() == null ? null : List.of(getSourceOutDir()));
} else
return paths.getPathForLocation(location);
}
private File getClassOutDir() {
if (classOutDir == uninited)
classOutDir = getOutputLocation(null, D);
return classOutDir;
}
private File getSourceOutDir() {
if (sourceOutDir == uninited)
sourceOutDir = getOutputLocation(null, S);
return sourceOutDir;
}
/**
* Enforces the specification of a "relative" URI as used in
* {@linkplain #getFileForInput(Location,String,URI)
* 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();
}
}