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    
020    package org.crsh.cli.impl.bootstrap;
021    
022    import org.crsh.cli.impl.Delimiter;
023    import org.crsh.cli.impl.descriptor.HelpDescriptor;
024    import org.crsh.cli.impl.lang.CommandFactory;
025    import org.crsh.cli.impl.invocation.InvocationMatch;
026    import org.crsh.cli.impl.invocation.InvocationMatcher;
027    import org.crsh.cli.impl.lang.Instance;
028    import org.crsh.cli.impl.lang.ObjectCommandDescriptor;
029    import org.crsh.cli.impl.lang.Util;
030    
031    import java.util.Iterator;
032    import java.util.ServiceLoader;
033    
034    /** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
035    public class Main {
036    
037      public static void main(String[] args) throws Exception {
038        ServiceLoader<CommandProvider> loader = ServiceLoader.load(CommandProvider.class);
039        Iterator<CommandProvider> iterator = loader.iterator();
040        if (iterator.hasNext()) {
041    
042          //
043          StringBuilder line = new StringBuilder();
044          for (int i = 0;i < args.length;i++) {
045            if (i  > 0) {
046              line.append(' ');
047            }
048            Delimiter.EMPTY.escape(args[i], line);
049          }
050    
051          //
052          CommandProvider commandProvider = iterator.next();
053          Class<?> commandClass = commandProvider.getCommandClass();
054          handle(commandClass, line.toString());
055        }
056      }
057    
058      private static <T> void handle(Class<T> commandClass, String line) throws Exception {
059        ObjectCommandDescriptor<T> descriptor = CommandFactory.DEFAULT.create(commandClass);
060        HelpDescriptor<Instance<T>> helpDescriptor = HelpDescriptor.create(descriptor);
061        InvocationMatcher<Instance<T>> matcher = helpDescriptor.matcher();
062        InvocationMatch<Instance<T>> match = matcher.parse(line);
063        final T instance = commandClass.newInstance();
064        Object o = match.invoke(Util.wrap(instance));
065        if (o != null) {
066          System.out.println(o);
067        }
068      }
069    }