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.command;
021    
022    import org.crsh.io.Pipe;
023    import org.crsh.io.ProducerContext;
024    
025    import java.io.IOException;
026    
027    class PipeCommandProxy<C, P> implements CommandInvoker<C, P> {
028    
029      /** . */
030      private final ProducerContext<P> innerContext;
031    
032      /** . */
033      private final CommandInvoker<C, P> delegate;
034    
035      /** . */
036      private final Pipe<C> next;
037    
038      PipeCommandProxy(ProducerContext<P> innerContext, CommandInvoker<C, P> delegate, Pipe<C> next) {
039        this.innerContext = innerContext;
040        this.delegate = delegate;
041        this.next = next;
042      }
043    
044      void fire() {
045        open(innerContext);
046      }
047    
048      public void setSession(CommandContext session) {
049        delegate.setSession(session);
050      }
051    
052      public Class<P> getProducedType() {
053        return delegate.getProducedType();
054      }
055    
056      public Class<C> getConsumedType() {
057        return delegate.getConsumedType();
058      }
059    
060      public void setPiped(boolean piped) {
061        delegate.setPiped(piped);
062      }
063    
064      public void open(ProducerContext<P> context) {
065        if (next != null && next instanceof PipeCommandProxy) {
066          ((PipeCommandProxy)next).fire();
067        }
068        delegate.open(context);
069      }
070    
071      public void provide(C element) throws ScriptException, IOException {
072        delegate.provide(element);
073      }
074    
075      public void flush() throws ScriptException, IOException {
076        delegate.flush();
077        if (next != null && next instanceof PipeCommand) {
078          ((PipeCommand)next).flush();
079        }
080      }
081    
082      public void close() throws ScriptException {
083        delegate.close();
084        if (next != null && next instanceof PipeCommand) {
085          ((PipeCommand)next).close();
086        }
087      }
088    }