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 public 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 public 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 public 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 }