1/* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24import java.io.*; 25import java.net.URI; 26import java.util.HashMap; 27import java.util.Map; 28import javax.tools.*; 29 30import static java.util.Collections.unmodifiableMap; 31 32/** 33 * class for storing source/byte code in memory. 34 */ 35public class InMemoryFileManager extends ForwardingJavaFileManager { 36 37 private final Map<String, InMemoryJavaFile> classes = new HashMap<>(); 38 39 public InMemoryFileManager(JavaFileManager fileManager) { 40 super(fileManager); 41 } 42 43 @Override 44 public JavaFileObject getJavaFileForOutput(Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException { 45 46 InMemoryJavaFile javaFile = new InMemoryJavaFile(className); 47 classes.put(className, javaFile); 48 return javaFile; 49 } 50 51 @Override 52 public ClassLoader getClassLoader(Location location) { 53 return new ClassLoader(this.getClass().getClassLoader()) { 54 @Override 55 protected Class<?> findClass(String name) throws ClassNotFoundException { 56 InMemoryJavaFile classData = classes.get(name); 57 if (classData == null) throw new ClassNotFoundException(name); 58 byte[] byteCode = classData.bos.toByteArray(); 59 return defineClass(name, byteCode, 0, byteCode.length); 60 } 61 }; 62 } 63 64 public Map<String, ? extends JavaFileObject> getClasses() { 65 return unmodifiableMap(classes); 66 } 67 68 private static class InMemoryJavaFile extends SimpleJavaFileObject { 69 70 private final ByteArrayOutputStream bos = 71 new ByteArrayOutputStream(); 72 73 74 protected InMemoryJavaFile(String name) { 75 super(URI.create("mfm:///" + name.replace('.', '/') + Kind.CLASS.extension), Kind.CLASS); 76 } 77 78 @Override 79 public OutputStream openOutputStream() throws IOException { 80 return bos; 81 } 82 83 @Override 84 public InputStream openInputStream() throws IOException { 85 return new ByteArrayInputStream(bos.toByteArray()); 86 } 87 } 88} 89