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     */
019    package org.crsh.lang.java;
020    
021    import org.crsh.cli.descriptor.Format;
022    import org.crsh.shell.impl.command.spi.CommandCreationException;
023    import org.crsh.shell.impl.command.spi.ShellCommand;
024    import org.crsh.plugin.CRaSHPlugin;
025    import org.crsh.plugin.PluginContext;
026    import org.crsh.shell.ErrorType;
027    import org.crsh.shell.impl.command.spi.CommandManager;
028    import org.crsh.shell.impl.command.spi.CommandResolution;
029    
030    import java.io.IOException;
031    import java.util.Collections;
032    import java.util.HashMap;
033    import java.util.List;
034    import java.util.Set;
035    
036    /** @author Julien Viet */
037    public class JavaCommandManager extends CRaSHPlugin<CommandManager> implements CommandManager {
038    
039      /** . */
040      private static final Set<String> EXT = Collections.singleton("java");
041    
042      /** . */
043      private Compiler compiler;
044    
045      @Override
046      public boolean isActive() {
047        return true;
048      }
049    
050      @Override
051      public void init() {
052        PluginContext context = getContext();
053        ClassLoader loader = context.getLoader();
054        Compiler compiler = new Compiler(loader);
055    
056        //
057        this.compiler = compiler;
058      }
059    
060      @Override
061      public CommandManager getImplementation() {
062        return this;
063      }
064    
065      public Set<String> getExtensions() {
066        return EXT;
067      }
068    
069      public CommandResolution resolveCommand(String name, byte[] source) throws CommandCreationException, NullPointerException {
070        String script = new String(source);
071        List<JavaClassFileObject> classFiles;
072        try {
073          classFiles = compiler.compile(name, script);
074        }
075        catch (IOException e) {
076          throw new CommandCreationException(name, ErrorType.INTERNAL, "Could not access command", e);
077        }
078        catch (CompilationFailureException e) {
079            throw new CommandCreationException(name, ErrorType.EVALUATION, "Could not compile command", e);
080        }
081        for (JavaClassFileObject classFile : classFiles) {
082          String className = classFile.getClassName();
083          String simpleName = className.substring(className.lastIndexOf('.') + 1);
084          if (simpleName.equals(name)) {
085            LoadingClassLoader loader = new LoadingClassLoader(getContext().getLoader(), classFiles);
086            try {
087              Class<?> clazz = loader.loadClass(classFile.getClassName());
088              final ShellCommandImpl command = new ShellCommandImpl(clazz);
089              final String description = command.describe(name, Format.DESCRIBE);
090              return new CommandResolution() {
091                @Override
092                public String getDescription() {
093                  return description;
094                }
095                @Override
096                public ShellCommand<Object> getCommand() throws CommandCreationException {
097                  return command;
098                }
099              };
100            }
101            catch (ClassNotFoundException e) {
102              throw new CommandCreationException(name, ErrorType.EVALUATION, "Command cannot be loaded", e);
103            }
104          }
105        }
106        throw new CommandCreationException(name, ErrorType.EVALUATION, "Command class not found");
107      }
108    
109      public void init(HashMap<String, Object> session) {
110        //
111      }
112    
113      public void destroy(HashMap<String, Object> session) {
114        //
115      }
116    
117      public String doCallBack(HashMap<String, Object> session, String name, String defaultValue) {
118        throw new UnsupportedOperationException("not yet implemented");
119      }
120    }