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.shell.impl.command; 021 022 import org.crsh.command.ScriptException; 023 import org.crsh.shell.InteractionContext; 024 import org.crsh.io.Filter; 025 import org.crsh.shell.ScreenContext; 026 import org.crsh.text.Chunk; 027 import org.crsh.text.ChunkAdapter; 028 029 import java.io.IOException; 030 031 /** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */ 032 abstract class Pipe<C, P> implements Filter<C, P, InteractionContext<P>>, InteractionContext<C> { 033 034 /** . */ 035 protected InteractionContext<P> context; 036 037 public final boolean takeAlternateBuffer() throws IOException { 038 return context.takeAlternateBuffer(); 039 } 040 041 public final boolean releaseAlternateBuffer() throws IOException { 042 return context.releaseAlternateBuffer(); 043 } 044 045 public final String getProperty(String propertyName) { 046 return context.getProperty(propertyName); 047 } 048 049 public final String readLine(String msg, boolean echo) { 050 return context.readLine(msg, echo); 051 } 052 053 public final int getWidth() { 054 return context.getWidth(); 055 } 056 057 public final int getHeight() { 058 return context.getHeight(); 059 } 060 061 /** 062 * A pipe filter that invokes a command through a {@link org.crsh.command.CommandInvoker}. 063 */ 064 static class Invoker<C, P> extends Pipe<C, P> { 065 066 /** . */ 067 final Filter<C, P, InteractionContext<P>> command; 068 069 Invoker(Filter<C, P, InteractionContext<P>> command) { 070 this.command = command; 071 } 072 073 public void setPiped(boolean piped) { 074 command.setPiped(piped); 075 } 076 077 public Class<P> getProducedType() { 078 return command.getProducedType(); 079 } 080 081 public Class<C> getConsumedType() { 082 return command.getConsumedType(); 083 } 084 085 public void open(InteractionContext<P> consumer) { 086 this.context = consumer; 087 this.command.open(consumer); 088 } 089 090 public void provide(C element) throws IOException { 091 if (command.getConsumedType().isInstance(element)) { 092 command.provide(element); 093 } 094 } 095 096 public void flush() throws IOException { 097 command.flush(); 098 } 099 100 public void close() throws ScriptException { 101 command.close(); 102 } 103 } 104 105 static class Chunkizer extends Pipe<Object, Chunk> { 106 107 /** . */ 108 private ChunkAdapter ca; 109 110 public Class<Chunk> getProducedType() { 111 return Chunk.class; 112 } 113 114 public Class<Object> getConsumedType() { 115 return Object.class; 116 } 117 118 public void setPiped(boolean piped) { 119 ((Pipe<Chunk, ?>)context).setPiped(piped); 120 } 121 122 public void open(final InteractionContext<Chunk> consumer) { 123 ca = new ChunkAdapter(new ScreenContext<Chunk>() { 124 public int getWidth() { 125 return consumer.getWidth(); 126 } 127 public int getHeight() { 128 return consumer.getHeight(); 129 } 130 public Class<Chunk> getConsumedType() { 131 return Chunk.class; 132 } 133 public void provide(Chunk element) throws IOException { 134 Chunkizer.this.context.provide(element); 135 } 136 public void flush() throws IOException { 137 Chunkizer.this.context.flush(); 138 } 139 }); 140 141 this.context = consumer; 142 } 143 144 public void provide(Object element) throws ScriptException, IOException { 145 ca.provide(element); 146 } 147 148 public void flush() throws ScriptException, IOException { 149 ca.flush(); 150 } 151 152 public void close() throws ScriptException { 153 ((Pipe<Chunk, ?>)context).close(); 154 } 155 } 156 157 static class Sink<P> extends Pipe<Object, P> { 158 159 /** . */ 160 private final Class<P> producedType; 161 162 Sink(Class<P> producedType) { 163 this.producedType = producedType; 164 } 165 166 public Class<P> getProducedType() { 167 return producedType; 168 } 169 170 public void setPiped(boolean piped) { 171 } 172 173 public void open(InteractionContext<P> consumer) { 174 this.context = consumer; 175 } 176 177 public void provide(Object element) throws IOException { 178 } 179 180 public Class<Object> getConsumedType() { 181 return Object.class; 182 } 183 184 public void flush() throws IOException { 185 context.flush(); 186 } 187 188 public void close() { 189 ((Pipe<P, ?>)context).close(); 190 } 191 } 192 }