/*
* Copyright (C) 2010-2101 Alibaba Group Holding Limited.
*
* 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.alibaba.otter.shared.common.utils.compile.model;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import javax.tools.JavaFileObject;
public final class JdkCompilerClassLoader extends ClassLoader {
private final Map<String, JavaFileObject> classes = new HashMap<String, JavaFileObject>();
public JdkCompilerClassLoader(ClassLoader parentClassLoader){
super(parentClassLoader);
}
public Collection<JavaFileObject> files() {
return Collections.unmodifiableCollection(classes.values());
}
public void clearCache() {
this.classes.clear();
}
public JavaFileObject getJavaFileObject(String qualifiedClassName) {
return classes.get(qualifiedClassName);
}
protected synchronized Class<?> findClass(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 Class.forName(qualifiedClassName);
} catch (ClassNotFoundException nf) {
// Ignore and fall through
}
try {
return Thread.currentThread().getContextClassLoader().loadClass(qualifiedClassName);
} catch (ClassNotFoundException nf) {
// Ignore and fall through
}
return super.findClass(qualifiedClassName);
}
public void add(String qualifiedClassName, final JavaFileObject javaFile) {
classes.put(qualifiedClassName, javaFile);
}
protected synchronized Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
try {
Class c = findClass(name);
if (c != null) {
if (resolve) {
resolveClass(c);
}
return c;
}
} catch (ClassNotFoundException e) {
// Ignore and fall through
}
return super.loadClass(name, resolve);
}
public InputStream getResourceAsStream(final String name) {
if (name.endsWith(".class")) {
String qualifiedClassName = name.substring(0, name.length() - ".class".length()).replace('/', '.');
JavaFileObjectImpl file = (JavaFileObjectImpl) classes.get(qualifiedClassName);
if (file != null) {
return new ByteArrayInputStream(file.getByteCode());
}
}
return super.getResourceAsStream(name);
}
}