/*
* Copyright (c) 2003, 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.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.StringTokenizer;
import java.util.zip.ZipFile;
import javax.tools.JavaFileManager.Location;
import com.sun.tools.javac.code.Lint;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.ListBuffer;
import com.sun.tools.javac.util.Log;
import com.sun.tools.javac.util.Options;
import static javax.tools.StandardLocation.*;
import static com.sun.tools.javac.main.OptionName.*;
/** This class converts command line arguments, environment variables
* and system properties (in File.pathSeparator-separated String form)
* into a boot class path, user class path, and source path (in
* Collection<String> form).
*
* <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 Paths {
/** The context key for the todo list */
protected static final Context.Key<Paths> pathsKey =
new Context.Key<Paths>();
/** Get the Paths instance for this context.
* @param context the context
* @return the Paths instance for this context
*/
public static Paths instance(Context context) {
Paths instance = context.get(pathsKey);
if (instance == null)
instance = new Paths(context);
return instance;
}
/** The log to use for warning output */
private Log log;
/** Collection of command-line options */
private Options options;
/** Handler for -Xlint options */
private Lint lint;
/** Access to (possibly cached) file info */
private FSInfo fsInfo;
protected Paths(Context context) {
context.put(pathsKey, this);
pathsForLocation = new HashMap<Location,Path>(16);
setContext(context);
}
void setContext(Context context) {
log = Log.instance(context);
options = Options.instance(context);
lint = Lint.instance(context);
fsInfo = FSInfo.instance(context);
}
/** Whether to warn about non-existent path elements */
private boolean warn;
private Map<Location, Path> pathsForLocation;
private boolean inited = false; // TODO? caching bad?
/**
* rt.jar as found on the default bootclass path. If the user specified a
* bootclasspath, null is used.
*/
private File bootClassPathRtJar = null;
Path getPathForLocation(Location location) {
Path path = pathsForLocation.get(location);
if (path == null)
setPathForLocation(location, null);
return pathsForLocation.get(location);
}
void setPathForLocation(Location location, Iterable<? extends File> path) {
// TODO? if (inited) throw new IllegalStateException
// TODO: otherwise reset sourceSearchPath, classSearchPath as needed
Path p;
if (path == null) {
if (location == CLASS_PATH)
p = computeUserClassPath();
else if (location == PLATFORM_CLASS_PATH)
p = computeBootClassPath();
else if (location == ANNOTATION_PROCESSOR_PATH)
p = computeAnnotationProcessorPath();
else if (location == SOURCE_PATH)
p = computeSourcePath();
else
// no defaults for other paths
p = null;
} else {
p = new Path();
for (File f: path)
p.addFile(f, warn); // TODO: is use of warn appropriate?
}
pathsForLocation.put(location, p);
}
protected void lazy() {
if (!inited) {
warn = lint.isEnabled(Lint.LintCategory.PATH);
pathsForLocation.put(PLATFORM_CLASS_PATH, computeBootClassPath());
pathsForLocation.put(CLASS_PATH, computeUserClassPath());
pathsForLocation.put(SOURCE_PATH, computeSourcePath());
inited = true;
}
}
public Collection<File> bootClassPath() {
lazy();
return Collections.unmodifiableCollection(getPathForLocation(PLATFORM_CLASS_PATH));
}
public Collection<File> userClassPath() {
lazy();
return Collections.unmodifiableCollection(getPathForLocation(CLASS_PATH));
}
public Collection<File> sourcePath() {
lazy();
Path p = getPathForLocation(SOURCE_PATH);
return p == null || p.size() == 0
? null
: Collections.unmodifiableCollection(p);
}
boolean isBootClassPathRtJar(File file) {
return file.equals(bootClassPathRtJar);
}
/**
* Split a path into its elements. Empty path elements will be ignored.
* @param path The path to be split
* @return The elements of the path
*/
private static Iterable<File> getPathEntries(String path) {
return getPathEntries(path, null);
}
/**
* Split a path into its elements. If emptyPathDefault is not null, all
* empty elements in the path, including empty elements at either end of
* the path, will be replaced with the value of emptyPathDefault.
* @param path The path to be split
* @param emptyPathDefault The value to substitute for empty path elements,
* or null, to ignore empty path elements
* @return The elements of the path
*/
private static Iterable<File> getPathEntries(String path, File emptyPathDefault) {
ListBuffer<File> entries = new ListBuffer<File>();
int start = 0;
while (start <= path.length()) {
int sep = path.indexOf(File.pathSeparatorChar, start);
if (sep == -1)
sep = path.length();
if (start < sep)
entries.add(new File(path.substring(start, sep)));
else if (emptyPathDefault != null)
entries.add(emptyPathDefault);
start = sep + 1;
}
return entries;
}
private class Path extends LinkedHashSet<File> {
private static final long serialVersionUID = 0;
private boolean expandJarClassPaths = false;
private Set<File> canonicalValues = new HashSet<File>();
public Path expandJarClassPaths(boolean x) {
expandJarClassPaths = x;
return this;
}
/** What to use when path element is the empty string */
private File emptyPathDefault = null;
public Path emptyPathDefault(File x) {
emptyPathDefault = x;
return this;
}
public Path() { super(); }
public Path addDirectories(String dirs, boolean warn) {
if (dirs != null)
for (File dir : getPathEntries(dirs))
addDirectory(dir, warn);
return this;
}
public Path addDirectories(String dirs) {
return addDirectories(dirs, warn);
}
private void addDirectory(File dir, boolean warn) {
if (!dir.isDirectory()) {
if (warn)
log.warning("dir.path.element.not.found", dir);
return;
}
File[] files = dir.listFiles();
if (files == null)
return;
for (File direntry : files) {
if (isArchive(direntry))
addFile(direntry, warn);
}
}
public Path addFiles(String files, boolean warn) {
if (files != null)
for (File file : getPathEntries(files, emptyPathDefault))
addFile(file, warn);
return this;
}
public Path addFiles(String files) {
return addFiles(files, warn);
}
public void addFile(File file, boolean warn) {
if (contains(file)) {
// discard duplicates
return;
}
if (! fsInfo.exists(file)) {
/* No such file or directory exists */
if (warn)
log.warning("path.element.not.found", file);
super.add(file);
return;
}
File canonFile = fsInfo.getCanonicalFile(file);
if (canonicalValues.contains(canonFile)) {
/* Discard duplicates and avoid infinite recursion */
return;
}
if (fsInfo.isFile(file)) {
/* File is an ordinary file. */
if (!isArchive(file)) {
/* Not a recognized extension; open it to see if
it looks like a valid zip file. */
try {
ZipFile z = new ZipFile(file);
z.close();
if (warn)
log.warning("unexpected.archive.file", file);
} catch (IOException e) {
// FIXME: include e.getLocalizedMessage in warning
if (warn)
log.warning("invalid.archive.file", file);
return;
}
}
}
/* Now what we have left is either a directory or a file name
conforming to archive naming convention */
super.add(file);
canonicalValues.add(canonFile);
if (expandJarClassPaths && fsInfo.isFile(file))
addJarClassPath(file, warn);
}
// Adds referenced classpath elements from a jar's Class-Path
// Manifest entry. In some future release, we may want to
// update this code to recognize URLs rather than simple
// filenames, but if we do, we should redo all path-related code.
private void addJarClassPath(File jarFile, boolean warn) {
try {
for (File f: fsInfo.getJarClassPath(jarFile)) {
addFile(f, warn);
}
} catch (IOException e) {
log.error("error.reading.file", jarFile, JavacFileManager.getMessage(e));
}
}
}
private Path computeBootClassPath() {
bootClassPathRtJar = null;
String optionValue;
Path path = new Path();
path.addFiles(options.get(XBOOTCLASSPATH_PREPEND));
if ((optionValue = options.get(ENDORSEDDIRS)) != null)
path.addDirectories(optionValue);
else
path.addDirectories(System.getProperty("java.endorsed.dirs"), false);
if ((optionValue = options.get(BOOTCLASSPATH)) != null) {
path.addFiles(optionValue);
} else {
// Standard system classes for this compiler's release.
String files = System.getProperty("sun.boot.class.path");
path.addFiles(files, false);
File rt_jar = new File("rt.jar");
for (File file : getPathEntries(files)) {
if (new File(file.getName()).equals(rt_jar))
bootClassPathRtJar = file;
}
}
path.addFiles(options.get(XBOOTCLASSPATH_APPEND));
// Strictly speaking, standard extensions are not bootstrap
// classes, but we treat them identically, so we'll pretend
// that they are.
if ((optionValue = options.get(EXTDIRS)) != null)
path.addDirectories(optionValue);
else
path.addDirectories(System.getProperty("java.ext.dirs"), false);
return path;
}
private Path computeUserClassPath() {
String cp = options.get(CLASSPATH);
// CLASSPATH environment variable when run from `javac'.
if (cp == null) cp = System.getProperty("env.class.path");
// If invoked via a java VM (not the javac launcher), use the
// platform class path
if (cp == null && System.getProperty("application.home") == null)
cp = System.getProperty("java.class.path");
// Default to current working directory.
if (cp == null) cp = ".";
return new Path()
.expandJarClassPaths(true) // Only search user jars for Class-Paths
.emptyPathDefault(new File(".")) // Empty path elt ==> current directory
.addFiles(cp);
}
private Path computeSourcePath() {
String sourcePathArg = options.get(SOURCEPATH);
if (sourcePathArg == null)
return null;
return new Path().addFiles(sourcePathArg);
}
private Path computeAnnotationProcessorPath() {
String processorPathArg = options.get(PROCESSORPATH);
if (processorPathArg == null)
return null;
return new Path().addFiles(processorPathArg);
}
/** The actual effective locations searched for sources */
private Path sourceSearchPath;
public Collection<File> sourceSearchPath() {
if (sourceSearchPath == null) {
lazy();
Path sourcePath = getPathForLocation(SOURCE_PATH);
Path userClassPath = getPathForLocation(CLASS_PATH);
sourceSearchPath = sourcePath != null ? sourcePath : userClassPath;
}
return Collections.unmodifiableCollection(sourceSearchPath);
}
/** The actual effective locations searched for classes */
private Path classSearchPath;
public Collection<File> classSearchPath() {
if (classSearchPath == null) {
lazy();
Path bootClassPath = getPathForLocation(PLATFORM_CLASS_PATH);
Path userClassPath = getPathForLocation(CLASS_PATH);
classSearchPath = new Path();
classSearchPath.addAll(bootClassPath);
classSearchPath.addAll(userClassPath);
}
return Collections.unmodifiableCollection(classSearchPath);
}
/** The actual effective locations for non-source, non-class files */
private Path otherSearchPath;
Collection<File> otherSearchPath() {
if (otherSearchPath == null) {
lazy();
Path userClassPath = getPathForLocation(CLASS_PATH);
Path sourcePath = getPathForLocation(SOURCE_PATH);
if (sourcePath == null)
otherSearchPath = userClassPath;
else {
otherSearchPath = new Path();
otherSearchPath.addAll(userClassPath);
otherSearchPath.addAll(sourcePath);
}
}
return Collections.unmodifiableCollection(otherSearchPath);
}
/** Is this the name of an archive file? */
private boolean isArchive(File file) {
String n = file.getName().toLowerCase();
return fsInfo.isFile(file)
&& (n.endsWith(".jar") || n.endsWith(".zip"));
}
/**
* Utility method for converting a search path string to an array
* of directory and JAR file URLs.
*
* Note that this method is called by apt and the DocletInvoker.
*
* @param path the search path string
* @return the resulting array of directory and JAR file URLs
*/
public static URL[] pathToURLs(String path) {
StringTokenizer st = new StringTokenizer(path, File.pathSeparator);
URL[] urls = new URL[st.countTokens()];
int count = 0;
while (st.hasMoreTokens()) {
URL url = fileToURL(new File(st.nextToken()));
if (url != null) {
urls[count++] = url;
}
}
if (urls.length != count) {
URL[] tmp = new URL[count];
System.arraycopy(urls, 0, tmp, 0, count);
urls = tmp;
}
return urls;
}
/**
* Returns the directory or JAR file URL corresponding to the specified
* local file name.
*
* @param file the File object
* @return the resulting directory or JAR file URL, or null if unknown
*/
private static URL fileToURL(File file) {
String name;
try {
name = file.getCanonicalPath();
} catch (IOException e) {
name = file.getAbsolutePath();
}
name = name.replace(File.separatorChar, '/');
if (!name.startsWith("/")) {
name = "/" + name;
}
// If the file does not exist, then assume that it's a directory
if (!file.isFile()) {
name = name + "/";
}
try {
return new URL("file", "", name);
} catch (MalformedURLException e) {
throw new IllegalArgumentException(file.toString());
}
}
}