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 org.crsh.cli.descriptor.Format;
022import org.crsh.cli.impl.descriptor.IntrospectionException;
023import org.crsh.shell.ErrorKind;
024import org.crsh.shell.impl.command.spi.CommandException;
025import org.crsh.shell.impl.command.ShellSession;
026import org.crsh.shell.impl.command.spi.Command;
027import org.crsh.lang.spi.CommandResolution;
028
029import java.io.IOException;
030import java.util.Collections;
031import java.util.List;
032import java.util.Set;
033
034/** @author Julien Viet */
035public class JavaCompiler implements org.crsh.lang.spi.Compiler {
036
037  /** . */
038  private static final Set<String> EXT = Collections.singleton("java");
039
040  /** . */
041  private final org.crsh.lang.impl.java.Compiler compiler;
042
043  /** . */
044  private final ClassLoader loader;
045
046  JavaCompiler(ClassLoader loader) {
047    this.compiler = new org.crsh.lang.impl.java.Compiler(loader);
048    this.loader = loader;
049  }
050
051  public Set<String> getExtensions() {
052    return EXT;
053  }
054
055  public CommandResolution compileCommand(String name, byte[] source) throws CommandException, NullPointerException {
056    String script = new String(source);
057    List<JavaClassFileObject> classFiles;
058    try {
059      classFiles = compiler.compile(name, script);
060    }
061    catch (IOException e) {
062      throw new CommandException(ErrorKind.INTERNAL, "Could not access command", e);
063    }
064    catch (CompilationFailureException e) {
065        throw new CommandException(ErrorKind.INTERNAL, "Could not compile command", e);
066    }
067    for (JavaClassFileObject classFile : classFiles) {
068      String className = classFile.getClassName();
069      String simpleName = className.substring(className.lastIndexOf('.') + 1);
070      if (simpleName.equals(name)) {
071        LoadingClassLoader loader = new LoadingClassLoader(this.loader, classFiles);
072        try {
073          Class<?> clazz = loader.loadClass(classFile.getClassName());
074          final ClassShellCommand command;
075          try {
076            command = new ClassShellCommand(clazz);
077          }
078          catch (IntrospectionException e) {
079            throw new CommandException(ErrorKind.INTERNAL, "Invalid cli annotations", e);
080          }
081          final String description = command.describe(name, Format.DESCRIBE);
082          return new CommandResolution() {
083            @Override
084            public String getDescription() {
085              return description;
086            }
087            @Override
088            public Command<Object> getCommand() throws CommandException {
089              return command;
090            }
091          };
092        }
093        catch (ClassNotFoundException e) {
094          throw new CommandException(ErrorKind.INTERNAL, "Command cannot be loaded", e);
095        }
096      }
097    }
098    throw new CommandException(ErrorKind.INTERNAL, "Command class not found");
099  }
100
101  public void init(ShellSession session) {
102    //
103  }
104
105  public void destroy(ShellSession session) {
106    //
107  }
108
109  public String doCallBack(ShellSession session, String name, String defaultValue) {
110    throw new UnsupportedOperationException("not yet implemented");
111  }
112}