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.impl.lang.Instance;
022import org.crsh.command.BaseCommand;
023import org.crsh.command.InvocationContext;
024import org.crsh.shell.impl.command.spi.CommandException;
025import org.crsh.shell.impl.command.spi.CommandMatch;
026import org.crsh.shell.impl.command.spi.CommandInvoker;
027
028/**
029* @author Julien Viet
030*/
031abstract class BaseCommandMatch<T extends BaseCommand, C, P> extends CommandMatch<C, P> {
032
033  /** . */
034  private final ClassShellCommand<T> baseShellCommand;
035
036  public BaseCommandMatch(ClassShellCommand<T> baseShellCommand) {
037    this.baseShellCommand = baseShellCommand;
038  }
039
040  public CommandInvoker<C, P> getInvoker() throws CommandException {
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 CommandException;
069}