| /* |
| * Copyright (c) 2015, 2016, 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 javax.tools.*; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.net.URI; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| class Compiler { |
| final private Map<String,String> input; |
| private List<String> options; |
| |
| Compiler(Map<String,String> input) { |
| this.input = input; |
| } |
| |
| Compiler setRelease(int release) { |
| // Setting the -release option does not work for some reason |
| // so do it the old fashioned way |
| // options = Arrays.asList("-release", String.valueOf(release)); |
| String target = String.valueOf(release); |
| options = Arrays.asList("-source", target, "-target", target, "-classpath", ""); |
| return this; |
| } |
| |
| Map<String,byte[]> compile() { |
| List<SourceFileObject> cunits = createCompilationUnits(); |
| Map<String,ClassFileObject> cfos = createClassFileObjects(); |
| JavaCompiler jc = ToolProvider.getSystemJavaCompiler(); |
| JavaFileManager jfm = new CustomFileManager(jc.getStandardFileManager(null, null, null), cfos); |
| if(!jc.getTask(null, jfm, null, options, null, cunits).call()) { |
| throw new RuntimeException("Compilation failed"); |
| } |
| return createOutput(cfos); |
| } |
| |
| private List<SourceFileObject> createCompilationUnits() { |
| return input.entrySet().stream() |
| .map(e -> new SourceFileObject(e.getKey(), e.getValue())).collect(Collectors.toList()); |
| } |
| |
| private Map<String,ClassFileObject> createClassFileObjects() { |
| return input.keySet().stream() |
| .collect(Collectors.toMap(k -> k, k -> new ClassFileObject(k))); |
| } |
| |
| private Map<String,byte[]> createOutput(Map<String,ClassFileObject> cfos) { |
| return cfos.keySet().stream().collect(Collectors.toMap(k -> k, k -> cfos.get(k).getBytes())); |
| } |
| |
| private static class SourceFileObject extends SimpleJavaFileObject { |
| private final String source; |
| |
| SourceFileObject(String name, String source) { |
| super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE); |
| this.source = source; |
| } |
| |
| @Override |
| public CharSequence getCharContent(boolean ignoreEncodingErrors) { |
| return source; |
| } |
| } |
| |
| private static class ClassFileObject extends SimpleJavaFileObject { |
| private final ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| |
| ClassFileObject(String className) { |
| super(URI.create(className), Kind.CLASS); |
| } |
| |
| @Override |
| public OutputStream openOutputStream() throws IOException { |
| return baos; |
| } |
| |
| public byte[] getBytes() { |
| return baos.toByteArray(); |
| } |
| } |
| |
| private static class CustomFileManager extends ForwardingJavaFileManager<JavaFileManager> { |
| private final Map<String,ClassFileObject> cfos; |
| |
| CustomFileManager(JavaFileManager jfm, Map<String,ClassFileObject> cfos) { |
| super(jfm); |
| this.cfos = cfos; |
| } |
| |
| @Override |
| public JavaFileObject getJavaFileForOutput(JavaFileManager.Location loc, String name, |
| JavaFileObject.Kind kind, FileObject sibling) throws IOException { |
| ClassFileObject cfo = cfos.get(name); |
| return cfo; |
| } |
| } |
| } |