001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019package org.crsh.lang.impl.java;
020
021import javax.tools.Diagnostic;
022import javax.tools.DiagnosticCollector;
023import javax.tools.JavaCompiler;
024import javax.tools.JavaFileObject;
025import javax.tools.ToolProvider;
026import java.io.IOException;
027import java.net.URISyntaxException;
028import java.nio.charset.Charset;
029import java.util.ArrayList;
030import java.util.Collections;
031import java.util.List;
032
033/** @author Julien Viet */
034class Compiler {
035
036  /** . */
037  private final ClassLoader classLoader;
038
039  Compiler() {
040    this.classLoader = Thread.currentThread().getContextClassLoader();
041  }
042
043  Compiler(ClassLoader classLoader) {
044    this.classLoader = classLoader;
045  }
046
047  List<JavaClassFileObject> compile(String className, String source) throws IOException, CompilationFailureException {
048
049    // Get compiler
050    JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
051
052    // Diagnostics
053    DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
054
055    // The compiler
056    JavaFileManagerImpl fileManager = new JavaFileManagerImpl(
057        compiler.getStandardFileManager(diagnostics, null, Charset.defaultCharset()),
058        new ClasspathResolver(classLoader));
059
060    //
061    List<JavaFileObject> sources;
062    try {
063      sources = Collections.<JavaFileObject>singletonList(new JavaSourceFileObject(className, source));
064    }
065    catch (URISyntaxException e) {
066      throw new IOException(e);
067    }
068
069    // Compile
070    JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, diagnostics, null, null, sources);
071
072    //
073    Boolean ok = task.call();
074    if (!ok) {
075      ArrayList<Diagnostic<? extends JavaFileObject>> errors = new ArrayList<Diagnostic<? extends JavaFileObject>>();
076      for (Diagnostic<? extends JavaFileObject> diagnostic : diagnostics.getDiagnostics()) {
077        if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
078          errors.add(diagnostic);
079        }
080      }
081      throw new CompilationFailureException(errors);
082    } else {
083      return new ArrayList<JavaClassFileObject>(fileManager.getClasses());
084    }
085  }
086
087}