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Hk2XmlGenerator.java
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Hk2XmlGenerator.java
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/*
* Copyright (c) 2015, 2024 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.hk2.xml.tools;
import java.io.DataOutputStream;
import java.io.File;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Set;
import java.util.concurrent.locks.ReentrantLock;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Filer;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic.Kind;
import javax.tools.JavaFileObject;
import org.glassfish.hk2.xml.internal.Generator;
import org.glassfish.hk2.xml.internal.alt.papi.TypeElementAltClassImpl;
/**
* @author jwells
*
*/
@SupportedAnnotationTypes("org.glassfish.hk2.xml.api.annotations.Hk2XmlPreGenerate")
public class Hk2XmlGenerator extends AbstractProcessor {
private final ReentrantLock lock = new ReentrantLock();
private volatile boolean initialized;
private ClassPool defaultClassPool;
private CtClass superClazz;
/**
* Gets rid of warnings and this code should work with all source versions
*/
@Override
public SourceVersion getSupportedSourceVersion() {
return SourceVersion.latest();
}
private void initializeHk2XmlGenerator() {
if (initialized) return;
lock.lock();
try {
if (initialized) return;
defaultClassPool = new ClassPool(true);
ClassLoader localLoader = getClass().getClassLoader();
if (!(localLoader instanceof URLClassLoader)) {
throw new RuntimeException("Unknown classloader: " + localLoader);
}
@SuppressWarnings("resource")
URLClassLoader urlLoader = (URLClassLoader) localLoader;
for (URL url : urlLoader.getURLs()) {
URI uri;
try {
uri = url.toURI();
}
catch (URISyntaxException e) {
throw new RuntimeException(e);
}
File asFile = new File(uri);
if (!asFile.exists() || !asFile.canRead()) {
continue;
}
try {
defaultClassPool.appendClassPath(asFile.getAbsolutePath());
}
catch (NotFoundException e) {
throw new RuntimeException(e);
}
}
try {
superClazz = defaultClassPool.get("org.glassfish.hk2.xml.jaxb.internal.BaseHK2JAXBBean");
}
catch (NotFoundException e) {
throw new RuntimeException(e);
}
} finally {
lock.unlock();
}
}
/* (non-Javadoc)
* @see javax.annotation.processing.AbstractProcessor#process(java.util.Set, javax.annotation.processing.RoundEnvironment)
*/
@Override
public boolean process(Set<? extends TypeElement> annotations,
RoundEnvironment roundEnv) {
Filer filer = processingEnv.getFiler();
for (TypeElement annotation : annotations) {
Set<? extends Element> clazzes = roundEnv.getElementsAnnotatedWith(annotation);
for (Element clazzElement : clazzes) {
if (!(clazzElement instanceof TypeElement)) continue;
initializeHk2XmlGenerator();
TypeElement clazz = (TypeElement) clazzElement;
TypeElementAltClassImpl altClass = new TypeElementAltClassImpl(clazz, processingEnv);
try {
CtClass ctClass = Generator.generate(altClass, superClazz, defaultClassPool);
String ctClassName = ctClass.getName();
JavaFileObject jfo = filer.createClassFile(ctClassName, clazzElement);
OutputStream outputStream = jfo.openOutputStream();
DataOutputStream dataOutputStream = null;
try {
dataOutputStream = new DataOutputStream(outputStream);
ctClass.toBytecode(dataOutputStream);
}
finally {
if (dataOutputStream != null) {
dataOutputStream.close();
}
outputStream.close();
}
}
catch (Throwable e) {
String msg = e.getMessage();
if (msg == null) msg = "Exception of type " + e.getClass().getName();
processingEnv.getMessager().printMessage(Kind.ERROR, "While processing class: " + clazz.getQualifiedName() + " got exeption: " + msg);
e.printStackTrace();
}
}
}
return true;
}
}