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 }