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.IOContext;
023    import org.crsh.io.ProducerContext;
024    import org.crsh.shell.impl.command.CRaSHSession;
025    import org.crsh.shell.impl.command.PipeLineFactory;
026    import org.crsh.shell.impl.command.PipeLineParser;
027    import org.crsh.text.Chunk;
028    import org.crsh.text.RenderPrintWriter;
029    
030    import java.io.IOException;
031    import java.util.Map;
032    
033    class InvocationContextImpl<P> implements InvocationContext<P> {
034    
035      /** . */
036      private final ProducerContext<P> producerContext;
037    
038      /** . */
039      private RenderPrintWriter writer;
040    
041      InvocationContextImpl(ProducerContext<P> producerContext) {
042        this.producerContext = producerContext;
043      }
044    
045      public RenderPrintWriter getWriter() {
046        if (writer == null) {
047          writer = new RenderPrintWriter(new IOContext<Chunk>() {
048            public int getWidth() {
049              return producerContext.getWidth();
050            }
051            public int getHeight() {
052              return producerContext.getHeight();
053            }
054            public void provide(Chunk element) throws IOException {
055              Class<P> consumedType = producerContext.getConsumedType();
056              if (consumedType.isInstance(element)) {
057                P p = consumedType.cast(element);
058                producerContext.provide(p);
059              }
060            }
061            public void flush() throws IOException {
062              producerContext.flush();
063            }
064          });
065        }
066        return writer;
067      }
068    
069      public CommandInvoker<?, ?> resolve(String s) throws ScriptException, IOException {
070        // A bit nasty : will improve that later
071        CRaSHSession session = (CRaSHSession)getSession();
072        PipeLineParser parser= new PipeLineParser(s);
073        PipeLineFactory factory = parser.parse();
074        try {
075          return factory.create(session);
076        }
077        catch (NoSuchCommandException e) {
078          throw new ScriptException(e);
079        }
080      }
081    
082      public Class<P> getConsumedType() {
083        return producerContext.getConsumedType();
084      }
085    
086      public String getProperty(String propertyName) {
087        return producerContext.getProperty(propertyName);
088      }
089    
090      public String readLine(String msg, boolean echo) {
091        return producerContext.readLine(msg, echo);
092      }
093    
094      public int getWidth() {
095        return producerContext.getWidth();
096      }
097    
098      public int getHeight() {
099        return producerContext.getHeight();
100      }
101    
102      public void provide(P element) throws IOException {
103        producerContext.provide(element);
104      }
105    
106      public void flush() throws IOException {
107        producerContext.flush();
108      }
109    
110      public Map<String, Object> getSession() {
111        return producerContext.getSession();
112      }
113    
114      public Map<String, Object> getAttributes() {
115        return producerContext.getAttributes();
116      }
117    }