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.ScreenContext;
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    final class InvocationContextImpl<P> implements InvocationContext<P> {
034    
035      /** . */
036      private final ProducerContext<P> producerContext;
037    
038      /** . */
039      private final CommandContext sessionContext;
040    
041      /** . */
042      private RenderPrintWriter writer;
043    
044      InvocationContextImpl(ProducerContext<P> producerContext, CommandContext sessionContext) {
045        this.producerContext = producerContext;
046        this.sessionContext = sessionContext;
047      }
048    
049      public RenderPrintWriter getWriter() {
050        if (writer == null) {
051          writer = new RenderPrintWriter(new ScreenContext<Chunk>() {
052            public int getWidth() {
053              return producerContext.getWidth();
054            }
055            public int getHeight() {
056              return producerContext.getHeight();
057            }
058            public void provide(Chunk element) throws IOException {
059              Class<P> consumedType = producerContext.getConsumedType();
060              if (consumedType.isInstance(element)) {
061                P p = consumedType.cast(element);
062                producerContext.provide(p);
063              }
064            }
065            public void flush() throws IOException {
066              producerContext.flush();
067            }
068          });
069        }
070        return writer;
071      }
072    
073      public boolean takeAlternateBuffer() {
074        return producerContext.takeAlternateBuffer();
075      }
076    
077      public boolean releaseAlternateBuffer() {
078        return producerContext.releaseAlternateBuffer();
079      }
080    
081      public CommandInvoker<?, ?> resolve(String s) throws ScriptException, IOException {
082        // A bit nasty : will improve that later
083        CRaSHSession session = (CRaSHSession)getSession();
084        PipeLineParser parser= new PipeLineParser(s);
085        PipeLineFactory factory = parser.parse();
086        try {
087          return factory.create(session);
088        }
089        catch (NoSuchCommandException e) {
090          throw new ScriptException(e);
091        }
092      }
093    
094      public Class<P> getConsumedType() {
095        return producerContext.getConsumedType();
096      }
097    
098      public String getProperty(String propertyName) {
099        return producerContext.getProperty(propertyName);
100      }
101    
102      public String readLine(String msg, boolean echo) {
103        return producerContext.readLine(msg, echo);
104      }
105    
106      public int getWidth() {
107        return producerContext.getWidth();
108      }
109    
110      public int getHeight() {
111        return producerContext.getHeight();
112      }
113    
114      public void provide(P element) throws IOException {
115        producerContext.provide(element);
116      }
117    
118      public void flush() throws IOException {
119        producerContext.flush();
120      }
121    
122      public Map<String, Object> getSession() {
123        return sessionContext.getSession();
124      }
125    
126      public Map<String, Object> getAttributes() {
127        return sessionContext.getAttributes();
128      }
129    
130      public InvocationContextImpl<P> leftShift(Object o) throws IOException {
131        if (producerContext.getConsumedType().isInstance(o)) {
132          P p = producerContext.getConsumedType().cast(o);
133          producerContext.provide(p);
134        }
135        return this;
136      }
137    }