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