/*
* Copyright 2002-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.baidu.bjf.remoting.protobuf.utils.compiler;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.tools.DiagnosticCollector;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;
import com.baidu.bjf.remoting.protobuf.utils.ClassHelper;
import com.baidu.bjf.remoting.protobuf.utils.StringUtils;
/**
* JdkCompiler. (SPI, Singleton, ThreadSafe)
*
* @author xiemalin
* @since 1.0.0
*/
public class JdkCompiler extends AbstractCompiler {
/**
* Logger for this class
*/
private static final Logger LOGGER = Logger.getLogger(JdkCompiler.class.getName());
private final JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
private final ClassLoaderImpl classLoader;
private final JavaFileManagerImpl javaFileManager;
private volatile List<String> options;
private static final String DEFAULT_JDK_VERSION = "1.6";
public JdkCompiler(final ClassLoader loader) {
this(loader, DEFAULT_JDK_VERSION);
}
public JdkCompiler(final ClassLoader loader, final String jdkVersion) {
options = new ArrayList<String>();
options.add("-source");
options.add(jdkVersion);
options.add("-target");
options.add(jdkVersion);
if (compiler == null) {
throw new RuntimeException(
"compiler is null maybe you are on JRE enviroment please change to JDK enviroment.");
}
DiagnosticCollector<JavaFileObject> diagnosticCollector = new DiagnosticCollector<JavaFileObject>();
StandardJavaFileManager manager = compiler.getStandardFileManager(diagnosticCollector, null, null);
if (loader instanceof URLClassLoader
&& (!loader.getClass().getName().equals("sun.misc.Launcher$AppClassLoader"))) {
try {
URLClassLoader urlClassLoader = (URLClassLoader) loader;
List<File> files = new ArrayList<File>();
for (URL url : urlClassLoader.getURLs()) {
String file = url.getFile();
if (StringUtils.endsWith(file, "!/")) {
file = StringUtils.removeEnd(file, "!/");
}
if (file.startsWith("file:")) {
file = StringUtils.removeStart(file, "file:");
}
files.add(new File(file));
}
manager.setLocation(StandardLocation.CLASS_PATH, files);
} catch (IOException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
classLoader = AccessController.doPrivileged(new PrivilegedAction<ClassLoaderImpl>() {
public ClassLoaderImpl run() {
return new ClassLoaderImpl(loader);
}
});
javaFileManager = new JavaFileManagerImpl(manager, classLoader);
}
@Override
public synchronized Class<?> doCompile(String name, String sourceCode, OutputStream os) throws Throwable {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("Begin to compile source code: class is '" + name + "'");
}
int i = name.lastIndexOf('.');
String packageName = i < 0 ? "" : name.substring(0, i);
String className = i < 0 ? name : name.substring(i + 1);
JavaFileObjectImpl javaFileObject = new JavaFileObjectImpl(className, sourceCode);
javaFileManager.putFileForInput(StandardLocation.SOURCE_PATH, packageName, className
+ ClassUtils.JAVA_EXTENSION, javaFileObject);
DiagnosticCollector<JavaFileObject> diagnosticCollector = new DiagnosticCollector<JavaFileObject>();
Boolean result =
compiler.getTask(null, javaFileManager, diagnosticCollector, options, null,
Arrays.asList(new JavaFileObject[] { javaFileObject })).call();
if (result == null || !result.booleanValue()) {
throw new IllegalStateException("Compilation failed. class: " + name + ", diagnostics: "
+ diagnosticCollector.getDiagnostics());
}
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("compile source code done: class is '" + name + "'");
LOGGER.fine("loading class '" + name + "'");
}
Class<?> retClass = classLoader.loadClass(name);
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("loading class done '" + name + "'");
}
if (os != null) {
byte[] bytes = classLoader.loadClassBytes(name);
if (bytes != null) {
os.write(bytes);
os.flush();
}
}
return retClass;
}
@Override
public byte[] loadBytes(String className) {
byte[] bytes = classLoader.loadClassBytes(className);
return bytes;
}
private final class ClassLoaderImpl extends ClassLoader {
private final Map<String, JavaFileObject> classes = new HashMap<String, JavaFileObject>();
ClassLoaderImpl(final ClassLoader parentClassLoader) {
super(parentClassLoader);
}
Collection<JavaFileObject> files() {
return Collections.unmodifiableCollection(classes.values());
}
public byte[] loadClassBytes(final String qualifiedClassName) {
JavaFileObject file = classes.get(qualifiedClassName);
if (file != null) {
byte[] bytes = ((JavaFileObjectImpl) file).getByteCode();
return bytes;
}
return null;
}
@Override
protected Class<?> findClass(final String qualifiedClassName) throws ClassNotFoundException {
JavaFileObject file = classes.get(qualifiedClassName);
if (file != null) {
byte[] bytes = ((JavaFileObjectImpl) file).getByteCode();
return defineClass(qualifiedClassName, bytes, 0, bytes.length);
}
try {
return ClassHelper.forNameWithCallerClassLoader(qualifiedClassName, getClass());
} catch (ClassNotFoundException nf) {
return super.findClass(qualifiedClassName);
}
}
void add(final String qualifiedClassName, final JavaFileObject javaFile) {
classes.put(qualifiedClassName, javaFile);
}
@Override
protected synchronized Class<?> loadClass(final String name, final boolean resolve)
throws ClassNotFoundException {
return super.loadClass(name, resolve);
}
@Override
public InputStream getResourceAsStream(final String name) {
if (name.endsWith(ClassUtils.CLASS_EXTENSION)) {
String qualifiedClassName =
name.substring(0, name.length() - ClassUtils.CLASS_EXTENSION.length()).replace('/', '.');
JavaFileObjectImpl file = (JavaFileObjectImpl) classes.get(qualifiedClassName);
if (file != null) {
return new ByteArrayInputStream(file.getByteCode());
}
}
return super.getResourceAsStream(name);
}
}
private static final class JavaFileObjectImpl extends SimpleJavaFileObject {
private ByteArrayOutputStream bytecode;
private final CharSequence source;
public JavaFileObjectImpl(final String baseName, final CharSequence source) {
super(ClassUtils.toURI(baseName + ClassUtils.JAVA_EXTENSION), Kind.SOURCE);
this.source = source;
}
JavaFileObjectImpl(final String name, final Kind kind) {
super(ClassUtils.toURI(name), kind);
source = null;
}
public JavaFileObjectImpl(URI uri, Kind kind) {
super(uri, kind);
source = null;
}
@Override
public CharSequence getCharContent(final boolean ignoreEncodingErrors) throws UnsupportedOperationException {
if (source == null) {
throw new UnsupportedOperationException("source == null");
}
return source;
}
@Override
public InputStream openInputStream() {
return new ByteArrayInputStream(getByteCode());
}
@Override
public OutputStream openOutputStream() {
return bytecode = new ByteArrayOutputStream();
}
public byte[] getByteCode() {
if (bytecode == null) {
return null;
}
return bytecode.toByteArray();
}
}
private static final class JavaFileManagerImpl extends ForwardingJavaFileManager<JavaFileManager> {
private final ClassLoaderImpl classLoader;
private final Map<URI, JavaFileObject> fileObjects = new HashMap<URI, JavaFileObject>();
public JavaFileManagerImpl(JavaFileManager fileManager, ClassLoaderImpl classLoader) {
super(fileManager);
this.classLoader = classLoader;
}
@Override
public FileObject getFileForInput(Location location, String packageName, String relativeName)
throws IOException {
FileObject o = fileObjects.get(uri(location, packageName, relativeName));
if (o != null) {
return o;
}
return super.getFileForInput(location, packageName, relativeName);
}
public void putFileForInput(StandardLocation location, String packageName, String relativeName,
JavaFileObject file) {
fileObjects.put(uri(location, packageName, relativeName), file);
}
private URI uri(Location location, String packageName, String relativeName) {
return ClassUtils.toURI(location.getName() + '/' + packageName + '/' + relativeName);
}
@Override
public JavaFileObject getJavaFileForOutput(Location location, String qualifiedName, Kind kind,
FileObject outputFile) throws IOException {
JavaFileObject file = new JavaFileObjectImpl(qualifiedName, kind);
classLoader.add(qualifiedName, file);
return file;
}
@Override
public ClassLoader getClassLoader(JavaFileManager.Location location) {
return classLoader;
}
@Override
public String inferBinaryName(Location loc, JavaFileObject file) {
if (file instanceof JavaFileObjectImpl) {
return file.getName();
}
return super.inferBinaryName(loc, file);
}
@Override
public Iterable<JavaFileObject> list(Location location, String packageName, Set<Kind> kinds, boolean recurse)
throws IOException {
Iterable<JavaFileObject> result = super.list(location, packageName, kinds, recurse);
ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
List<URL> urlList = new ArrayList<URL>();
Enumeration<URL> e = contextClassLoader.getResources("com");
while (e.hasMoreElements()) {
urlList.add(e.nextElement());
}
ArrayList<JavaFileObject> files = new ArrayList<JavaFileObject>();
if (location == StandardLocation.CLASS_PATH && kinds.contains(JavaFileObject.Kind.CLASS)) {
for (JavaFileObject file : fileObjects.values()) {
if (file.getKind() == Kind.CLASS && file.getName().startsWith(packageName)) {
files.add(file);
}
}
files.addAll(classLoader.files());
} else if (location == StandardLocation.SOURCE_PATH && kinds.contains(JavaFileObject.Kind.SOURCE)) {
for (JavaFileObject file : fileObjects.values()) {
if (file.getKind() == Kind.SOURCE && file.getName().startsWith(packageName)) {
files.add(file);
}
}
}
for (JavaFileObject file : result) {
files.add(file);
}
return files;
}
}
}