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.shell.ScreenContext;
023    import org.crsh.shell.impl.command.CRaSHSession;
024    import org.crsh.shell.impl.command.PipeLineFactory;
025    import org.crsh.shell.impl.command.PipeLineParser;
026    import org.crsh.text.Chunk;
027    import org.crsh.text.RenderPrintWriter;
028    
029    import java.io.IOException;
030    import java.util.Map;
031    
032    final class InvocationContextImpl<P> implements InvocationContext<P> {
033    
034      /** . */
035      private final CommandContext<P> commandContext;
036    
037      /** . */
038      private RenderPrintWriter writer;
039    
040      InvocationContextImpl(CommandContext<P> commandContext) {
041        this.commandContext = commandContext;
042      }
043    
044      public boolean isPiped() {
045        return commandContext.isPiped();
046      }
047    
048      public RenderPrintWriter getWriter() {
049        if (writer == null) {
050          writer = new RenderPrintWriter(new ScreenContext<Chunk>() {
051            public int getWidth() {
052              return commandContext.getWidth();
053            }
054            public int getHeight() {
055              return commandContext.getHeight();
056            }
057            public Class<Chunk> getConsumedType() {
058              return Chunk.class;
059            }
060            public void provide(Chunk element) throws IOException {
061              Class<P> consumedType = commandContext.getConsumedType();
062              if (consumedType.isInstance(element)) {
063                P p = consumedType.cast(element);
064                commandContext.provide(p);
065              }
066            }
067            public void flush() throws IOException {
068              commandContext.flush();
069            }
070          });
071        }
072        return writer;
073      }
074    
075      public boolean takeAlternateBuffer() throws IOException {
076        return commandContext.takeAlternateBuffer();
077      }
078    
079      public boolean releaseAlternateBuffer() throws IOException {
080        return commandContext.releaseAlternateBuffer();
081      }
082    
083      public CommandInvoker<?, ?> resolve(String s) throws ScriptException, IOException {
084        // A bit nasty : will improve that later
085        CRaSHSession session = (CRaSHSession)getSession();
086        PipeLineParser parser= new PipeLineParser(s);
087        PipeLineFactory factory = parser.parse();
088        try {
089          return factory.create(session);
090        }
091        catch (NoSuchCommandException e) {
092          throw new ScriptException(e);
093        }
094      }
095    
096      public Class<P> getConsumedType() {
097        return commandContext.getConsumedType();
098      }
099    
100      public String getProperty(String propertyName) {
101        return commandContext.getProperty(propertyName);
102      }
103    
104      public String readLine(String msg, boolean echo) {
105        return commandContext.readLine(msg, echo);
106      }
107    
108      public int getWidth() {
109        return commandContext.getWidth();
110      }
111    
112      public int getHeight() {
113        return commandContext.getHeight();
114      }
115    
116      public void provide(P element) throws IOException {
117        commandContext.provide(element);
118      }
119    
120      public void flush() throws IOException {
121        commandContext.flush();
122      }
123    
124      public void close() throws IOException {
125        commandContext.close();
126      }
127    
128      public Map<String, Object> getSession() {
129        return commandContext.getSession();
130      }
131    
132      public Map<String, Object> getAttributes() {
133        return commandContext.getAttributes();
134      }
135    
136      public InvocationContextImpl<P> leftShift(Object o) throws IOException {
137        if (commandContext.getConsumedType().isInstance(o)) {
138          P p = commandContext.getConsumedType().cast(o);
139          commandContext.provide(p);
140        }
141        return this;
142      }
143    }