001    /*
002     * Copyright (C) 2003-2009 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.command;
020    
021    import groovy.lang.Binding;
022    import groovy.lang.Closure;
023    import groovy.lang.MissingPropertyException;
024    import groovy.lang.Script;
025    import org.crsh.cmdline.CommandCompletion;
026    import org.crsh.cmdline.Delimiter;
027    import org.crsh.cmdline.spi.ValueCompletion;
028    import org.crsh.util.Strings;
029    
030    import java.util.List;
031    
032    /**
033     * This class provides the base class for Groovy scripts. It should not be used directly as it is rather used
034     * for configuring a Groovy {@link org.codehaus.groovy.control.CompilerConfiguration#setScriptBaseClass(String)} class.
035     *
036     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
037     * @version $Revision$
038     */
039    public abstract class GroovyScriptCommand extends Script implements ShellCommand, CommandInvoker<Void, Void> {
040    
041      /** . */
042      private String[] args;
043    
044      public final Class<Void> getProducedType() {
045        return Void.class;
046      }
047    
048      public final Class<Void> getConsumedType() {
049        return Void.class;
050      }
051    
052      @Override
053      public final Object getProperty(String property) {
054        try {
055          return super.getProperty(property);
056        }
057        catch (MissingPropertyException e) {
058          return null;
059        }
060      }
061    
062      public final CommandCompletion complete(CommandContext context, String line) {
063        return new CommandCompletion(Delimiter.EMPTY, ValueCompletion.create());
064      }
065    
066      public String describe(String line, DescriptionFormat mode) {
067        return null;
068      }
069    
070      public final void invoke(InvocationContext<Void, Void> context) throws ScriptException {
071    
072        // Set up current binding
073        Binding binding = new Binding(context.getAttributes());
074    
075        // Set the args on the script
076        binding.setProperty("args", args);
077    
078        //
079        setBinding(binding);
080    
081        //
082        Object res = run();
083    
084        // Evaluate the closure
085        if (res instanceof Closure) {
086          Closure closure = (Closure)res;
087          res = closure.call(args);
088        }
089    
090        //
091        if (res != null) {
092          context.getWriter().print(res);
093        }
094      }
095    
096      public final CommandInvoker<?, ?> createInvoker(String line) {
097        List<String> chunks = Strings.chunks(line);
098        this.args = chunks.toArray(new String[chunks.size()]);
099        return this;
100      }
101    }