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 java.io.IOException; 023 024 /** 025 * A pipe command. 026 * 027 * @param <C> the consumed generic type 028 * @param <P> the produced generic type 029 */ 030 public abstract class PipeCommand<C, P> { 031 032 /** . */ 033 protected InvocationContext<P> context; 034 035 public final boolean isPiped() { 036 return context.isPiped(); 037 } 038 039 void doOpen(InvocationContext<P> context) { 040 this.context = context; 041 042 // 043 open(); 044 } 045 046 /** 047 * Open pipe. 048 */ 049 public void open() throws ScriptException { 050 } 051 052 /** 053 * Extends the throw clause of the {@link org.crsh.io.Consumer#provide(Object)} method. 054 * 055 * @param element the provided element 056 * @throws ScriptException any script exception 057 * @throws IOException any io exception 058 */ 059 public void provide(C element) throws ScriptException, IOException { 060 } 061 062 /** 063 * Flush pipe. 064 * 065 * @throws ScriptException any script exception 066 * @throws IOException any io exception 067 */ 068 public void flush() throws ScriptException, IOException { 069 context.flush(); 070 } 071 072 /** 073 * Close pipe. 074 * 075 * @throws ScriptException any script exception 076 */ 077 public void close() throws ScriptException { 078 } 079 }