| /* |
| * 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; |
| } |
| } |
| } |