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.impl.lang.Instance;
022    import org.crsh.command.BaseCommand;
023    import org.crsh.command.InvocationContext;
024    import org.crsh.shell.impl.command.spi.Command;
025    import org.crsh.shell.impl.command.spi.CommandCreationException;
026    import org.crsh.shell.impl.command.spi.CommandInvoker;
027    
028    /**
029    * @author Julien Viet
030    */
031    abstract class CommandImpl<T extends BaseCommand, C, P> extends Command<C, P> {
032    
033      /** . */
034      private final ShellCommandImpl<T> baseShellCommand;
035    
036      public CommandImpl(ShellCommandImpl<T> baseShellCommand) {
037        this.baseShellCommand = baseShellCommand;
038      }
039    
040      public CommandInvoker<C, P> getInvoker() throws CommandCreationException {
041        final T command = baseShellCommand.createCommand();
042        return getInvoker(command);
043      }
044    
045      abstract class BaseInvoker extends CommandInvoker<C, P> implements Instance<T> {
046    
047        final T command;
048    
049        protected BaseInvoker(T command) {
050          this.command = command;
051        }
052    
053        @Override
054        public <U> U resolve(Class<U> type) {
055          if (type.equals(InvocationContext.class)) {
056            return type.cast(command.peekContext());
057          } else {
058            return null;
059          }
060        }
061    
062        @Override
063        public T get() throws Exception {
064          return command;
065        }
066      }
067    
068      abstract BaseInvoker getInvoker(T command) throws CommandCreationException;
069    }