89 lines
3.0 KiB
Java
89 lines
3.0 KiB
Java
/*
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* Copyright (c) 2014, 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.*;
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import java.net.URI;
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import java.util.HashMap;
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import java.util.Map;
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import javax.tools.*;
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import static java.util.Collections.unmodifiableMap;
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/**
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* class for storing source/byte code in memory.
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*/
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public class InMemoryFileManager extends ForwardingJavaFileManager {
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private final Map<String, InMemoryJavaFile> classes = new HashMap<>();
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public InMemoryFileManager(JavaFileManager fileManager) {
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super(fileManager);
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}
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@Override
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public JavaFileObject getJavaFileForOutput(Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException {
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InMemoryJavaFile javaFile = new InMemoryJavaFile(className);
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classes.put(className, javaFile);
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return javaFile;
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}
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@Override
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public ClassLoader getClassLoader(Location location) {
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return new ClassLoader(this.getClass().getClassLoader()) {
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException {
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InMemoryJavaFile classData = classes.get(name);
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if (classData == null) throw new ClassNotFoundException(name);
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byte[] byteCode = classData.bos.toByteArray();
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return defineClass(name, byteCode, 0, byteCode.length);
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}
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};
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}
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public Map<String, ? extends JavaFileObject> getClasses() {
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return unmodifiableMap(classes);
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}
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private static class InMemoryJavaFile extends SimpleJavaFileObject {
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private final ByteArrayOutputStream bos =
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new ByteArrayOutputStream();
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protected InMemoryJavaFile(String name) {
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super(URI.create("mfm:///" + name.replace('.', '/') + Kind.CLASS.extension), Kind.CLASS);
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}
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@Override
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public OutputStream openOutputStream() throws IOException {
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return bos;
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}
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@Override
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public InputStream openInputStream() throws IOException {
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return new ByteArrayInputStream(bos.toByteArray());
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}
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}
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}
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