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com.greenpepper.shaded.org.codehaus.janino.Compiler Maven / Gradle / Ivy
/*
* Janino - An embedded Java[TM] compiler
*
* Copyright (c) 2001-2010, Arno Unkrig
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
* following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
package com.greenpepper.shaded.org.codehaus.janino;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import com.greenpepper.shaded.org.codehaus.commons.compiler.CompileException;
import com.greenpepper.shaded.org.codehaus.commons.compiler.ErrorHandler;
import com.greenpepper.shaded.org.codehaus.commons.compiler.Location;
import com.greenpepper.shaded.org.codehaus.commons.compiler.WarningHandler;
import com.greenpepper.shaded.org.codehaus.janino.Java.CompilationUnit;
import com.greenpepper.shaded.org.codehaus.janino.util.Benchmark;
import com.greenpepper.shaded.org.codehaus.janino.util.ClassFile;
import com.greenpepper.shaded.org.codehaus.janino.util.StringPattern;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.DirectoryResourceCreator;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.DirectoryResourceFinder;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.FileResource;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.FileResourceCreator;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.PathResourceFinder;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.Resource;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.ResourceCreator;
import com.greenpepper.shaded.org.codehaus.janino.util.resource.ResourceFinder;
/**
* A simplified substitute for the javac tool.
*
* Usage:
*
* java com.greenpepper.shaded.org.codehaus.janino.Compiler \
* [ -d destination-dir ] \
* [ -sourcepath dirlist ] \
* [ -classpath dirlist ] \
* [ -extdirs dirlist ] \
* [ -bootclasspath dirlist ] \
* [ -encoding encoding ] \
* [ -verbose ] \
* [ -g:none ] \
* [ -g:{source,lines,vars} ] \
* [ -warn:pattern-list ] \
* source-file ...
* java com.greenpepper.shaded.org.codehaus.janino.Compiler -help
*
*/
@SuppressWarnings({ "rawtypes", "unchecked" }) public
class Compiler {
private static final boolean DEBUG = false;
/** Command line interface. */
public static void
main(String[] args) {
File destinationDirectory = Compiler.NO_DESTINATION_DIRECTORY;
File[] optionalSourcePath = null;
File[] classPath = { new File(".") };
File[] optionalExtDirs = null;
File[] optionalBootClassPath = null;
String optionalCharacterEncoding = null;
boolean verbose = false;
boolean debugSource = true;
boolean debugLines = true;
boolean debugVars = false;
StringPattern[] warningHandlePatterns = Compiler.DEFAULT_WARNING_HANDLE_PATTERNS;
boolean rebuild = false;
// Process command line options.
int i;
for (i = 0; i < args.length; ++i) {
String arg = args[i];
if (arg.charAt(0) != '-') break;
if ("-d".equals(arg)) {
destinationDirectory = new File(args[++i]);
} else
if ("-sourcepath".equals(arg)) {
optionalSourcePath = PathResourceFinder.parsePath(args[++i]);
} else
if ("-classpath".equals(arg)) {
classPath = PathResourceFinder.parsePath(args[++i]);
} else
if ("-extdirs".equals(arg)) {
optionalExtDirs = PathResourceFinder.parsePath(args[++i]);
} else
if ("-bootclasspath".equals(arg)) {
optionalBootClassPath = PathResourceFinder.parsePath(args[++i]);
} else
if ("-encoding".equals(arg)) {
optionalCharacterEncoding = args[++i];
} else
if ("-verbose".equals(arg)) {
verbose = true;
} else
if ("-g".equals(arg)) {
debugSource = true;
debugLines = true;
debugVars = true;
} else
if (arg.startsWith("-g:")) {
if (arg.indexOf("none") != -1) debugSource = (debugLines = (debugVars = false));
if (arg.indexOf("source") != -1) debugSource = true;
if (arg.indexOf("lines") != -1) debugLines = true;
if (arg.indexOf("vars") != -1) debugVars = true;
} else
if (arg.startsWith("-warn:")) {
warningHandlePatterns = StringPattern.parseCombinedPattern(arg.substring(6));
} else
if ("-rebuild".equals(arg)) {
rebuild = true;
} else
if ("-help".equals(arg)) {
System.out.printf(Compiler.USAGE, (Object[]) null);
System.exit(1);
} else
{
System.err.println("Unrecognized command line option \"" + arg + "\"; try \"-help\".");
System.exit(1);
}
}
// Get source file names.
if (i == args.length) {
System.err.println("No source files given on command line; try \"-help\".");
System.exit(1);
}
File[] sourceFiles = new File[args.length - i];
for (int j = i; j < args.length; ++j) sourceFiles[j - i] = new File(args[j]);
// Create the compiler object.
final Compiler compiler = new Compiler(
optionalSourcePath,
classPath,
optionalExtDirs,
optionalBootClassPath,
destinationDirectory,
optionalCharacterEncoding,
verbose,
debugSource,
debugLines,
debugVars,
warningHandlePatterns,
rebuild
);
// Compile source files.
try {
compiler.compile(sourceFiles);
} catch (Exception e) {
System.err.println(e.toString());
System.exit(1);
}
}
private static final String USAGE = (
""
+ "Usage:%n"
+ "%n"
+ " java " + Compiler.class.getName() + " [ ] ... ...%n"
+ "%n"
+ "Supported s are:%n"
+ " -d Where to save class files%n"
+ " -sourcepath Where to look for other source files%n"
+ " -classpath Where to look for other class files%n"
+ " -extdirs Where to look for other class files%n"
+ " -bootclasspath Where to look for other class files%n"
+ " -encoding Encoding of source files, e.g. \"UTF-8\" or \"ISO-8859-1\"%n"
+ " -verbose%n"
+ " -g Generate all debugging info%n"
+ " -g:none Generate no debugging info%n"
+ " -g:{source,lines,vars} Generate only some debugging info%n"
+ " -warn: Issue certain warnings; examples:%n"
+ " -warn:* Enables all warnings%n"
+ " -warn:IASF Only warn against implicit access to static fields%n"
+ " -warn:*-IASF Enables all warnings, except those against implicit%n"
+ " access to static fields%n"
+ " -warn:*-IA*+IASF Enables all warnings, except those against implicit%n"
+ " accesses, but do warn against implicit access to%n"
+ " static fields%n"
+ " -rebuild Compile all source files, even if the class files%n"
+ " seems up-to-date%n"
+ " -help%n"
+ "%n"
+ "The default encoding in this environment is \"" + Charset.defaultCharset().toString() + "\"."
);
private final ResourceFinder classFileFinder;
/** Special value for "classFileResourceFinder". */
public static final ResourceFinder FIND_NEXT_TO_SOURCE_FILE = null;
private final ResourceCreator classFileCreator;
/** Special value for "classFileResourceCreator". */
public static final ResourceCreator CREATE_NEXT_TO_SOURCE_FILE = null;
private final String optionalCharacterEncoding;
private final Benchmark benchmark;
private final boolean debugSource;
private final boolean debugLines;
private final boolean debugVars;
private WarningHandler optionalWarningHandler;
private ErrorHandler optionalCompileErrorHandler;
private final IClassLoader iClassLoader;
private final List parsedCompilationUnits = new ArrayList();
/**
* Initialize a Java™ compiler with the given parameters.
*
* Classes are searched in the following order:
*
* If {@code optionalBootClassPath} is {@code null}:
*
* Through the system class loader of the JVM that runs JANINO
*
* If {@code optionalBootClassPath} is not {@code null}:
*
* Through the {@code optionalBootClassPath}
*
* If {@code optionalExtDirs} is not {@code null}:
*
* Through the {@code optionalExtDirs}
*
* Through the {@code classPath}
* If {@code optionalSourcePath} is {@code null}:
*
* Through source files found on the {@code classPath}
*
* If {@code optionalSourcePath} is not {@code null}:
*
* Through source files found on the {@code sourcePath}
*
*
*
* The file name of a class file that represents class "pkg.Example"
* is determined as follows:
*
*
* If {@code optionalDestinationDirectory} is not {@link #NO_DESTINATION_DIRECTORY}:
* {@code optionalDestinationDirectory /pkg/Example.class}
*
* If {@code optionalDestinationDirectory} is {@link #NO_DESTINATION_DIRECTORY}:
* {@code dir1/dir2/Example.class} (Assuming that the file name of the
* source file that declares the class was
* {@code dir1/dir2/Any.java}.)
*
*
* @see #DEFAULT_WARNING_HANDLE_PATTERNS
*/
public
Compiler(
final File[] optionalSourcePath,
final File[] classPath,
final File[] optionalExtDirs,
final File[] optionalBootClassPath,
final File destinationDirectory,
final String optionalCharacterEncoding,
boolean verbose,
boolean debugSource,
boolean debugLines,
boolean debugVars,
StringPattern[] warningHandlePatterns,
boolean rebuild
) {
this(
new PathResourceFinder( // sourceFinder
optionalSourcePath == null ? classPath : optionalSourcePath
),
IClassLoader.createJavacLikePathIClassLoader( // iClassLoader
optionalBootClassPath,
optionalExtDirs,
classPath
),
( // classFileFinder
rebuild
? ResourceFinder.EMPTY_RESOURCE_FINDER
: destinationDirectory == Compiler.NO_DESTINATION_DIRECTORY
? Compiler.FIND_NEXT_TO_SOURCE_FILE
: new DirectoryResourceFinder(destinationDirectory)
),
( // classFileCreator
destinationDirectory == Compiler.NO_DESTINATION_DIRECTORY
? Compiler.CREATE_NEXT_TO_SOURCE_FILE
: new DirectoryResourceCreator(destinationDirectory)
),
optionalCharacterEncoding, // optionalCharacterEncoding
verbose, // verbose
debugSource, // debugSource
debugLines, // debugLines
debugVars, // debugVars
new FilterWarningHandler( // optionalWarningHandler
warningHandlePatterns,
new SimpleWarningHandler() // <= Anonymous class here is complicated because the enclosing instance is
// not fully initialized yet
)
);
this.benchmark.report("*** JANINO - an embedded compiler for the Java(TM) programming language");
this.benchmark.report("*** For more information visit http://janino.codehaus.org");
this.benchmark.report("Source path", optionalSourcePath);
this.benchmark.report("Class path", classPath);
this.benchmark.report("Ext dirs", optionalExtDirs);
this.benchmark.report("Boot class path", optionalBootClassPath);
this.benchmark.report("Destination directory", destinationDirectory);
this.benchmark.report("Character encoding", optionalCharacterEncoding);
this.benchmark.report("Verbose", new Boolean(verbose));
this.benchmark.report("Debug source", new Boolean(debugSource));
this.benchmark.report("Debug lines", new Boolean(debugSource));
this.benchmark.report("Debug vars", new Boolean(debugSource));
this.benchmark.report("Warning handle patterns", warningHandlePatterns);
this.benchmark.report("Rebuild", new Boolean(rebuild));
}
/** Backwards compatibility -- previously, "null" was officially documented. */
public static final File NO_DESTINATION_DIRECTORY = null;
/** Prints warnings to STDERR. */
public static
class SimpleWarningHandler implements WarningHandler {
@Override public void
handleWarning(String handle, String message, Location optionalLocation) {
StringBuilder sb = new StringBuilder();
if (optionalLocation != null) sb.append(optionalLocation).append(": ");
sb.append("Warning ").append(handle).append(": ").append(message);
System.err.println(sb.toString());
}
}
/**
* The default value for the {@code warningHandlerPatterns} parameter of {@link Compiler#Compiler(File[], File[],
* File[], File[], File, String, boolean, boolean, boolean, boolean, StringPattern[], boolean)}.
*/
public static final StringPattern[] DEFAULT_WARNING_HANDLE_PATTERNS = StringPattern.PATTERNS_NONE;
/**
* To mimic the behavior of JAVAC with a missing "-d" command line option,
* pass {@link #FIND_NEXT_TO_SOURCE_FILE} as the {@code classFileResourceFinder} and
* {@link #CREATE_NEXT_TO_SOURCE_FILE} as the {@code classFileResourceCreator}.
*
* If it is impossible to check whether an already-compiled class file
* exists, or if you want to enforce recompilation, pass
* {@link ResourceFinder#EMPTY_RESOURCE_FINDER} as the
* {@code classFileResourceFinder}.
*
* @param sourceFinder Finds extra Java compilation units that need to be compiled (a.k.a. "-sourcepath")
* @param iClassLoader Loads auxiliary {@link IClass}es (a.k.a. "-classpath"), e.g. new
* ClassLoaderIClassLoader(ClassLoader)
* @param classFileFinder Where to look for up-to-date class files that need not be compiled (a.k.a. "-d")
* @param classFileCreator Used to store generated class files (a.k.a. "-d")
* @param optionalWarningHandler Used to issue warnings
*/
public
Compiler(
ResourceFinder sourceFinder,
IClassLoader iClassLoader,
ResourceFinder classFileFinder,
ResourceCreator classFileCreator,
final String optionalCharacterEncoding,
boolean verbose,
boolean debugSource,
boolean debugLines,
boolean debugVars,
WarningHandler optionalWarningHandler
) {
this.classFileFinder = classFileFinder;
this.classFileCreator = classFileCreator;
this.optionalCharacterEncoding = optionalCharacterEncoding;
this.benchmark = new Benchmark(verbose);
this.debugSource = debugSource;
this.debugLines = debugLines;
this.debugVars = debugVars;
this.optionalWarningHandler = optionalWarningHandler;
// Set up the IClassLoader.
this.iClassLoader = new CompilerIClassLoader(sourceFinder, iClassLoader);
}
/**
* Install a custom {@link ErrorHandler}. The default {@link ErrorHandler} prints the first 20 compile errors to
* {@link System#err} and then throws a {@link CompileException}.
*
* Passing {@code null} restores the default {@link ErrorHandler}.
*
* Notice that scan and parse errors are not redirected to this {@link ErrorHandler}, instead, they cause a
* {@link CompileException} to be thrown. Also, the {@link Compiler} may choose to throw {@link CompileException}s
* in certain, fatal compile error situations, even if an {@link ErrorHandler} is installed.
*
* In other words: In situations where compilation can reasonably continue after a compile error, the {@link
* ErrorHandler} is called; all other error conditions cause a {@link CompileException} to be thrown.
*/
public void
setCompileErrorHandler(ErrorHandler optionalCompileErrorHandler) {
this.optionalCompileErrorHandler = optionalCompileErrorHandler;
}
/**
* By default, warnings are discarded, but an application my install a custom {@link WarningHandler}.
*
* @param optionalWarningHandler {@code null} to indicate that no warnings be issued
*/
public void
setWarningHandler(WarningHandler optionalWarningHandler) {
this.optionalWarningHandler = optionalWarningHandler;
}
/**
* Reads a set of Java™ compilation units (a.k.a. "source
* files") from the file system, compiles them into a set of "class
* files" and stores these in the file system. Additional source files are
* parsed and compiled on demand through the "source path" set of
* directories.
*
* For example, if the source path comprises the directories "A/B" and "../C",
* then the source file for class "com.acme.Main" is searched in
*
* A/B/com/acme/Main.java
* ../C/com/acme/Main.java
*
* Notice that it does make a difference whether you pass multiple source
* files to {@link #compile(File[])} or if you invoke
* {@link #compile(File[])} multiply: In the former case, the source
* files may contain arbitrary references among each other (even circular
* ones). In the latter case, only the source files on the source path
* may contain circular references, not the {@code sourceFiles}.
*
* This method must be called exactly once after object construction.
*
* Compile errors are reported as described at
* {@link #setCompileErrorHandler(ErrorHandler)}.
*
* @param sourceFiles Contain the compilation units to compile
* @return {@code true} for backwards compatibility (return value can safely be ignored)
* @throws CompileException Fatal compilation error, or the {@link CompileException} thrown be the installed compile
* error handler
* @throws IOException Occurred when reading from the {@code sourceFiles}
*/
public boolean
compile(File[] sourceFiles) throws CompileException, IOException {
this.benchmark.report("Source files", sourceFiles);
Resource[] sourceFileResources = new Resource[sourceFiles.length];
for (int i = 0; i < sourceFiles.length; ++i) sourceFileResources[i] = new FileResource(sourceFiles[i]);
this.compile(sourceFileResources);
return true;
}
/**
* See {@link #compile(File[])}.
*
* @param sourceResources Contain the compilation units to compile
* @return {@code true} for backwards compatibility (return value can safely be ignored)
*/
public boolean
compile(Resource[] sourceResources) throws CompileException, IOException {
// Set up the compile error handler as described at "setCompileErrorHandler()".
final ErrorHandler ceh = (
this.optionalCompileErrorHandler != null
? this.optionalCompileErrorHandler
: new ErrorHandler() {
int compileErrorCount;
@Override public void
handleError(String message, Location optionalLocation) throws CompileException {
CompileException ex = new CompileException(message, optionalLocation);
if (++this.compileErrorCount >= 20) throw ex;
System.err.println(ex.getMessage());
}
}
);
this.benchmark.beginReporting();
try {
// Parse all source files.
this.parsedCompilationUnits.clear();
for (Resource sourceResource : sourceResources) {
if (Compiler.DEBUG) System.out.println("Compiling \"" + sourceResource + "\"");
this.parsedCompilationUnits.add(new UnitCompiler(this.parseCompilationUnit(
sourceResource.getFileName(), // fileName
new BufferedInputStream(sourceResource.open()), // inputStream
this.optionalCharacterEncoding // optionalCharacterEncoding
), this.iClassLoader));
}
// Compile all parsed compilation units. The vector of parsed CUs may grow while they are being compiled,
// but eventually all CUs will be compiled.
for (int i = 0; i < this.parsedCompilationUnits.size(); ++i) {
UnitCompiler unitCompiler = (UnitCompiler) this.parsedCompilationUnits.get(i);
File sourceFile;
{
CompilationUnit compilationUnit = unitCompiler.getCompilationUnit();
if (compilationUnit.optionalFileName == null) throw new JaninoRuntimeException();
sourceFile = new File(compilationUnit.optionalFileName);
}
unitCompiler.setCompileErrorHandler(ceh);
unitCompiler.setWarningHandler(this.optionalWarningHandler);
this.benchmark.beginReporting("Compiling compilation unit \"" + sourceFile + "\"");
ClassFile[] classFiles;
try {
// Compile the compilation unit.
classFiles = unitCompiler.compileUnit(this.debugSource, this.debugLines, this.debugVars);
} finally {
this.benchmark.endReporting();
}
// Store the compiled classes and interfaces into class files.
this.benchmark.beginReporting(
"Storing "
+ classFiles.length
+ " class file(s) resulting from compilation unit \""
+ sourceFile
+ "\""
);
try {
for (ClassFile classFile : classFiles) this.storeClassFile(classFile, sourceFile);
} finally {
this.benchmark.endReporting();
}
}
} finally {
this.benchmark.endReporting("Compiled " + this.parsedCompilationUnits.size() + " compilation unit(s)");
}
return true;
}
/**
* Read one compilation unit from a file and parse it.
*
* The {@code inputStream} is closed before the method returns.
* @return the parsed compilation unit
*/
private Java.CompilationUnit
parseCompilationUnit(
String fileName,
InputStream inputStream,
String optionalCharacterEncoding
) throws CompileException, IOException {
try {
Scanner scanner = new Scanner(fileName, inputStream, optionalCharacterEncoding);
scanner.setWarningHandler(this.optionalWarningHandler);
Parser parser = new Parser(scanner);
parser.setWarningHandler(this.optionalWarningHandler);
this.benchmark.beginReporting("Parsing \"" + fileName + "\"");
try {
return parser.parseCompilationUnit();
} finally {
this.benchmark.endReporting();
}
} finally {
inputStream.close();
}
}
/**
* Construct the name of a file that could store the byte code of the class with the given
* name.
*
* If {@code optionalDestinationDirectory} is non-null, the returned path is the
* {@code optionalDestinationDirectory} plus the package of the class (with dots replaced
* with file separators) plus the class name plus ".class". Example:
* "destdir/pkg1/pkg2/Outer$Inner.class"
*
* If {@code optionalDestinationDirectory} is null, the returned path is the
* directory of the {@code sourceFile} plus the class name plus ".class". Example:
* "srcdir/Outer$Inner.class"
* @param className E.g. "pkg1.pkg2.Outer$Inner"
* @param sourceFile E.g. "srcdir/Outer.java"
* @param optionalDestinationDirectory E.g. "destdir"
*/
public static File
getClassFile(String className, File sourceFile, File optionalDestinationDirectory) {
if (optionalDestinationDirectory != null) {
return new File(optionalDestinationDirectory, ClassFile.getClassFileResourceName(className));
} else {
int idx = className.lastIndexOf('.');
return new File(
sourceFile.getParentFile(),
ClassFile.getClassFileResourceName(className.substring(idx + 1))
);
}
}
/**
* Store the byte code of this {@link ClassFile} in the file system. Directories are created
* as necessary.
* @param classFile
* @param sourceFile Required to compute class file path if no destination directory given
*/
public void
storeClassFile(ClassFile classFile, final File sourceFile) throws IOException {
String classFileResourceName = ClassFile.getClassFileResourceName(classFile.getThisClassName());
// Determine where to create the class file.
ResourceCreator rc;
if (this.classFileCreator != Compiler.CREATE_NEXT_TO_SOURCE_FILE) {
rc = this.classFileCreator;
} else {
// If the JAVAC option "-d" is given, place the class file next
// to the source file, irrespective of the package name.
rc = new FileResourceCreator() {
@Override protected File
getFile(String resourceName) {
return new File(
sourceFile.getParentFile(),
resourceName.substring(resourceName.lastIndexOf('/') + 1)
);
}
};
}
OutputStream os = rc.createResource(classFileResourceName);
try {
classFile.store(os);
} catch (IOException ioe) {
try { os.close(); } catch (IOException e) {}
os = null;
if (!rc.deleteResource(classFileResourceName)) {
IOException ioe2 = new IOException(
"Could not delete incompletely written class file \""
+ classFileResourceName
+ "\""
);
ioe2.initCause(ioe);
throw ioe2; // SUPPRESS CHECKSTYLE AvoidHidingCause
}
throw ioe;
} finally {
if (os != null) try { os.close(); } catch (IOException e) {}
}
}
/**
* A specialized {@link IClassLoader} that loads {@link IClass}es from the following
* sources:
*
* An already-parsed compilation unit
* A class file in the output directory (if existant and younger than source file)
* A source file in any of the source path directories
* The parent class loader
*
* Notice that the {@link CompilerIClassLoader} is an inner class of {@link Compiler} and
* heavily uses {@link Compiler}'s members.
*/
private
class CompilerIClassLoader extends IClassLoader {
private final ResourceFinder sourceFinder;
/**
* @param sourceFinder Where to look for source files
* @param optionalParentIClassLoader {@link IClassLoader} through which {@link IClass}es are to be loaded
*/
public
CompilerIClassLoader(ResourceFinder sourceFinder, IClassLoader optionalParentIClassLoader) {
super(optionalParentIClassLoader);
this.sourceFinder = sourceFinder;
super.postConstruct();
}
/**
* @param type field descriptor of the {@IClass} to load, e.g. "Lpkg1/pkg2/Outer$Inner;"
* @return {@code null} if a the type could not be found
* @throws ClassNotFoundException if an exception was raised while loading the {@link IClass}
*/
@Override protected IClass
findIClass(final String type) throws ClassNotFoundException {
if (Compiler.DEBUG) System.out.println("type = " + type);
// Determine the class name.
String className = Descriptor.toClassName(type); // E.g. "pkg1.pkg2.Outer$Inner"
if (Compiler.DEBUG) System.out.println("2 className = \"" + className + "\"");
// Do not attempt to load classes from package "java".
if (className.startsWith("java.")) return null;
// Determine the name of the top-level class.
String topLevelClassName;
{
int idx = className.indexOf('$');
topLevelClassName = idx == -1 ? className : className.substring(0, idx);
}
// Check the already-parsed compilation units.
for (int i = 0; i < Compiler.this.parsedCompilationUnits.size(); ++i) {
UnitCompiler uc = (UnitCompiler) Compiler.this.parsedCompilationUnits.get(i);
IClass res = uc.findClass(topLevelClassName);
if (res != null) {
if (!className.equals(topLevelClassName)) {
res = uc.findClass(className);
if (res == null) return null;
}
this.defineIClass(res);
return res;
}
}
// Search source path for uncompiled class.
final Resource sourceResource = this.sourceFinder.findResource(ClassFile.getSourceResourceName(className));
if (sourceResource == null) return null;
// Find an existing class file.
Resource classFileResource;
if (Compiler.this.classFileFinder != Compiler.FIND_NEXT_TO_SOURCE_FILE) {
classFileResource = Compiler.this.classFileFinder.findResource(
ClassFile.getClassFileResourceName(className)
);
} else {
if (!(sourceResource instanceof FileResource)) return null;
File classFile = new File(
((FileResource) sourceResource).getFile().getParentFile(),
ClassFile.getClassFileResourceName(className.substring(className.lastIndexOf('.') + 1))
);
classFileResource = classFile.exists() ? new FileResource(classFile) : null;
}
// Compare source modification time against class file modification time.
if (classFileResource != null && sourceResource.lastModified() <= classFileResource.lastModified()) {
// The class file is up-to-date; load it.
return this.defineIClassFromClassFileResource(classFileResource);
} else {
// Source file not yet compiled or younger than class file.
return this.defineIClassFromSourceResource(sourceResource, className);
}
}
/**
* Parse the compilation unit stored in the given {@code sourceResource}, remember it in
* {@code Compiler.this.parsedCompilationUnits} (it may declare other classes that
* are needed later), find the declaration of the type with the given
* {@code className}, and define it in the {@link IClassLoader}.
*
* Notice that the CU is not compiled here!
*/
private IClass
defineIClassFromSourceResource(Resource sourceResource, String className) throws ClassNotFoundException {
// Parse the source file.
UnitCompiler uc;
try {
Java.CompilationUnit cu = Compiler.this.parseCompilationUnit(
sourceResource.getFileName(), // fileName
new BufferedInputStream(sourceResource.open()), // inputStream
Compiler.this.optionalCharacterEncoding // optionalCharacterEncoding
);
uc = new UnitCompiler(cu, Compiler.this.iClassLoader);
} catch (IOException ex) {
throw new ClassNotFoundException("Parsing compilation unit \"" + sourceResource + "\"", ex);
} catch (CompileException ex) {
throw new ClassNotFoundException("Parsing compilation unit \"" + sourceResource + "\"", ex);
}
// Remember compilation unit for later compilation.
Compiler.this.parsedCompilationUnits.add(uc);
// Define the class.
IClass res = uc.findClass(className);
if (res == null) {
// This is a really complicated case: We may find a source file on the source
// path that seemingly contains the declaration of the class we are looking
// for, but doesn't. This is possible if the underlying file system has
// case-insensitive file names and/or file names that are limited in length
// (e.g. DOS 8.3).
return null;
}
this.defineIClass(res);
return res;
}
/**
* Open the given {@code classFileResource}, read its contents, define it in the
* {@link IClassLoader}, and resolve it (this step may involve loading more classes).
*/
private IClass
defineIClassFromClassFileResource(Resource classFileResource) throws ClassNotFoundException {
Compiler.this.benchmark.beginReporting("Loading class file \"" + classFileResource.getFileName() + "\"");
try {
InputStream is = null;
ClassFile cf;
try {
is = classFileResource.open();
cf = new ClassFile(new BufferedInputStream(is));
} catch (IOException ex) {
throw new ClassNotFoundException("Opening class file resource \"" + classFileResource + "\"", ex);
} finally {
if (is != null) try { is.close(); } catch (IOException e) {}
}
ClassFileIClass result = new ClassFileIClass(
cf, // classFile
CompilerIClassLoader.this // iClassLoader
);
// Important: We must FIRST call "defineIClass()" so that the
// new IClass is known to the IClassLoader, and THEN
// "resolveAllClasses()", because otherwise endless recursion could
// occur.
this.defineIClass(result);
result.resolveAllClasses();
return result;
} finally {
Compiler.this.benchmark.endReporting();
}
}
}
}
