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/*
* Copyright (c) 2008, 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.
*
* 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.
*/
import java.io.ByteArrayOutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject.Kind;
import javax.tools.SimpleJavaFileObject;
import javax.tools.ToolProvider;
public final class MemoryClassLoader extends ClassLoader {
private final JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
private final MemoryFileManager manager = new MemoryFileManager(this.compiler);
public Class<?> compile(String name, String content) {
compile(new Source(name, content));
try {
return findClass(name);
}
catch (ClassNotFoundException exception) {
throw new Error(exception);
}
}
public void compile(Source... sources) {
List<Source> list = new ArrayList<Source>();
if (sources != null) {
for (Source source : sources) {
if (source != null) {
list.add(source);
}
}
}
synchronized (this.manager) {
this.compiler.getTask(null, this.manager, null, null, null, list).call();
}
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
synchronized (this.manager) {
Output mc = this.manager.map.remove(name);
if (mc != null) {
byte[] array = mc.toByteArray();
return defineClass(name, array, 0, array.length);
}
}
return super.findClass(name);
}
private static final class MemoryFileManager extends ForwardingJavaFileManager<JavaFileManager> {
private final Map<String, Output> map = new HashMap<String, Output>();
MemoryFileManager(JavaCompiler compiler) {
super(compiler.getStandardFileManager(null, null, null));
}
@Override
public Output getJavaFileForOutput(Location location, String name, Kind kind, FileObject source) {
Output mc = this.map.get(name);
if (mc == null) {
mc = new Output(name);
this.map.put(name, mc);
}
return mc;
}
}
private static class MemoryFileObject extends SimpleJavaFileObject {
MemoryFileObject(String name, Kind kind) {
super(toURI(name, kind.extension), kind);
}
private static URI toURI(String name, String extension) {
try {
return new URI("mfm:///" + name.replace('.', '/') + extension);
}
catch (URISyntaxException exception) {
throw new Error(exception);
}
}
}
private static final class Output extends MemoryFileObject {
private final ByteArrayOutputStream baos = new ByteArrayOutputStream();
Output(String name) {
super(name, Kind.CLASS);
}
byte[] toByteArray() {
return this.baos.toByteArray();
}
@Override
public ByteArrayOutputStream openOutputStream() {
this.baos.reset();
return this.baos;
}
}
public static final class Source extends MemoryFileObject {
private final String content;
Source(String name, String content) {
super(name, Kind.SOURCE);
this.content = content;
}
@Override
public CharSequence getCharContent(boolean ignore) {
return this.content;
}
}
}
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