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.impl.groovy.closure;
020    
021    import org.crsh.shell.impl.command.spi.CommandException;
022    import org.crsh.shell.impl.command.spi.CommandInvoker;
023    import org.crsh.command.InvocationContext;
024    import org.crsh.shell.impl.command.pipeline.PipeLine;
025    
026    import java.io.IOException;
027    import java.util.Arrays;
028    import java.util.LinkedList;
029    
030    /** @author Julien Viet */
031    public class PipeLineInvoker {
032    
033      /** . */
034      private final PipeLineClosure closure;
035    
036      /** . */
037      private final Object[] args;
038    
039      public PipeLineInvoker(PipeLineClosure closure, Object[] args) {
040        this.closure = closure;
041        this.args = args;
042      }
043    
044      public void invoke(InvocationContext<Object> context) throws IOException, CommandException {
045    
046        //
047        PipeLineInvocationContext inner = new PipeLineInvocationContext(context);
048        LinkedList<CommandInvoker> pipe = closure.resolve2(args);
049        CommandInvoker[] array = pipe.toArray(new CommandInvoker[pipe.size()]);
050        PipeLine pipeLine = new PipeLine(array);
051    
052        //
053        try {
054          pipeLine.open(inner);
055          pipeLine.flush();
056        } finally {
057          // This is on purpose
058          pipeLine.close();
059        }
060      }
061    
062      @Override
063      public String toString() {
064        return "PipeLineInvoker[" + closure + "](" + Arrays.toString(args) + ")";
065      }
066    }