144 lines
4.7 KiB
Java
144 lines
4.7 KiB
Java
/*
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* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.ByteArrayOutputStream;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import javax.tools.FileObject;
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import javax.tools.ForwardingJavaFileManager;
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import javax.tools.JavaCompiler;
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import javax.tools.JavaFileManager;
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import javax.tools.JavaFileObject.Kind;
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import javax.tools.SimpleJavaFileObject;
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import javax.tools.ToolProvider;
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public final class MemoryClassLoader extends ClassLoader {
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private final JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
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private final MemoryFileManager manager = new MemoryFileManager(this.compiler);
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public Class<?> compile(String name, String content) {
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compile(new Source(name, content));
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try {
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return findClass(name);
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}
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catch (ClassNotFoundException exception) {
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throw new Error(exception);
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}
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}
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public void compile(Source... sources) {
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List<Source> list = new ArrayList<Source>();
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if (sources != null) {
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for (Source source : sources) {
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if (source != null) {
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list.add(source);
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}
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}
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}
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synchronized (this.manager) {
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this.compiler.getTask(null, this.manager, null, null, null, list).call();
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}
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}
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException {
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synchronized (this.manager) {
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Output mc = this.manager.map.remove(name);
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if (mc != null) {
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byte[] array = mc.toByteArray();
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return defineClass(name, array, 0, array.length);
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}
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}
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return super.findClass(name);
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}
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private static final class MemoryFileManager extends ForwardingJavaFileManager<JavaFileManager> {
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private final Map<String, Output> map = new HashMap<String, Output>();
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MemoryFileManager(JavaCompiler compiler) {
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super(compiler.getStandardFileManager(null, null, null));
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}
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@Override
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public Output getJavaFileForOutput(Location location, String name, Kind kind, FileObject source) {
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Output mc = this.map.get(name);
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if (mc == null) {
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mc = new Output(name);
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this.map.put(name, mc);
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}
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return mc;
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}
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}
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private static class MemoryFileObject extends SimpleJavaFileObject {
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MemoryFileObject(String name, Kind kind) {
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super(toURI(name, kind.extension), kind);
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}
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private static URI toURI(String name, String extension) {
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try {
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return new URI("mfm:///" + name.replace('.', '/') + extension);
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}
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catch (URISyntaxException exception) {
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throw new Error(exception);
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}
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}
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}
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private static final class Output extends MemoryFileObject {
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private final ByteArrayOutputStream baos = new ByteArrayOutputStream();
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Output(String name) {
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super(name, Kind.CLASS);
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}
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byte[] toByteArray() {
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return this.baos.toByteArray();
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}
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@Override
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public ByteArrayOutputStream openOutputStream() {
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this.baos.reset();
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return this.baos;
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}
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}
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public static final class Source extends MemoryFileObject {
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private final String content;
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Source(String name, String content) {
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super(name, Kind.SOURCE);
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this.content = content;
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}
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@Override
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public CharSequence getCharContent(boolean ignore) {
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return this.content;
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}
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}
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}
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