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