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 open(CommandContext<P> consumer) { 056 if (next != null && next instanceof PipeCommandProxy) { 057 ((PipeCommandProxy)next).fire(); 058 } 059 delegate.open(consumer); 060 } 061 062 public void provide(C element) throws ScriptException, IOException { 063 delegate.provide(element); 064 } 065 066 public void flush() throws ScriptException, IOException { 067 delegate.flush(); 068 if (next != null && next instanceof PipeCommand) { 069 ((PipeCommand)next).flush(); 070 } 071 } 072 073 public void close() throws ScriptException, IOException { 074 delegate.close(); 075 if (next != null && next instanceof PipeCommand) { 076 ((PipeCommand)next).close(); 077 } 078 } 079 }