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.CommandContext;
023    import org.crsh.io.Consumer;
024    import org.crsh.shell.ScreenContext;
025    import org.crsh.shell.ShellProcessContext;
026    import org.crsh.text.Chunk;
027    import org.crsh.text.ChunkAdapter;
028    import org.crsh.text.ChunkBuffer;
029    
030    import java.io.Closeable;
031    import java.io.IOException;
032    import java.util.Map;
033    
034    class CRaSHProcessContext implements CommandContext<Object>, Closeable {
035    
036      /** . */
037      private final CRaSHSession session;
038    
039      /** . */
040      private final ShellProcessContext processContext;
041    
042      /** . */
043      private final ChunkAdapter adapter;
044    
045      /** . */
046      private boolean useAlternateBuffer;
047    
048      CRaSHProcessContext(CRaSHSession session, final ShellProcessContext processContext) {
049    
050        // We use this chunk buffer to buffer stuff
051        // but also because it optimises the chunks
052        // which provides better perormances on the client
053        final ChunkBuffer buffer = new ChunkBuffer(new Consumer<Chunk>() {
054          public void provide(Chunk element) throws IOException {
055            processContext.write(element);
056          }
057          public Class<Chunk> getConsumedType() {
058            return Chunk.class;
059          }
060          public void flush() throws IOException {
061            processContext.flush();
062          }
063        });
064    
065        //
066        final ChunkAdapter adapter = new ChunkAdapter(new ScreenContext() {
067          public int getWidth() {
068            return processContext.getWidth();
069          }
070    
071          public int getHeight() {
072            return processContext.getHeight();
073          }
074    
075          public void write(Chunk chunk) throws IOException {
076            provide(chunk);
077          }
078    
079          public Class<Chunk> getConsumedType() {
080            return Chunk.class;
081          }
082    
083          public void provide(Chunk element) throws IOException {
084            buffer.provide(element);
085          }
086    
087          public void flush() throws IOException {
088            buffer.flush();
089          }
090        });
091    
092        //
093        this.session = session;
094        this.processContext = processContext;
095        this.adapter = adapter;
096        this.useAlternateBuffer = false;
097      }
098    
099      public boolean isPiped() {
100        throw new UnsupportedOperationException();
101      }
102    
103      public boolean takeAlternateBuffer() throws IOException {
104        return useAlternateBuffer = processContext.takeAlternateBuffer();
105      }
106    
107      public boolean releaseAlternateBuffer() throws IOException {
108        return useAlternateBuffer = processContext.releaseAlternateBuffer();
109      }
110    
111      public String getProperty(String propertyName) {
112        return processContext.getProperty(propertyName);
113      }
114    
115      public String readLine(String msg, boolean echo) {
116        return processContext.readLine(msg, echo);
117      }
118    
119      public int getWidth() {
120        return adapter.getWidth();
121      }
122    
123      public int getHeight() {
124        return adapter.getHeight();
125      }
126    
127      public Class<Object> getConsumedType() {
128        return Object.class;
129      }
130    
131      public void write(Chunk chunk) throws IOException {
132        adapter.provide(chunk);
133      }
134    
135      public void provide(Object element) throws IOException {
136        adapter.provide(element);
137      }
138    
139      public void flush() throws IOException {
140        adapter.flush();
141      }
142    
143      public Map<String, Object> getSession() {
144        return session;
145      }
146    
147      public Map<String, Object> getAttributes() {
148        return session.crash.getContext().getAttributes();
149      }
150    
151      public void close() throws IOException {
152        if (useAlternateBuffer) {
153          releaseAlternateBuffer();
154        }
155      }
156    }