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.InteractionContext;
023    import org.crsh.shell.ScreenContext;
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 InteractionContext<P> producerContext;
037    
038      /** . */
039      private final RuntimeContext sessionContext;
040    
041      /** . */
042      private RenderPrintWriter writer;
043    
044      InvocationContextImpl(CommandContext<P> producerContext) {
045        this.producerContext = producerContext;
046        this.sessionContext = producerContext;
047      }
048    
049      InvocationContextImpl(InteractionContext<P> producerContext, RuntimeContext sessionContext) {
050        this.producerContext = producerContext;
051        this.sessionContext = sessionContext;
052      }
053    
054      public RenderPrintWriter getWriter() {
055        if (writer == null) {
056          writer = new RenderPrintWriter(new ScreenContext<Chunk>() {
057            public int getWidth() {
058              return producerContext.getWidth();
059            }
060            public int getHeight() {
061              return producerContext.getHeight();
062            }
063            public Class<Chunk> getConsumedType() {
064              return Chunk.class;
065            }
066            public void provide(Chunk element) throws IOException {
067              Class<P> consumedType = producerContext.getConsumedType();
068              if (consumedType.isInstance(element)) {
069                P p = consumedType.cast(element);
070                producerContext.provide(p);
071              }
072            }
073            public void flush() throws IOException {
074              producerContext.flush();
075            }
076          });
077        }
078        return writer;
079      }
080    
081      public boolean takeAlternateBuffer() throws IOException {
082        return producerContext.takeAlternateBuffer();
083      }
084    
085      public boolean releaseAlternateBuffer() throws IOException {
086        return producerContext.releaseAlternateBuffer();
087      }
088    
089      public CommandInvoker<?, ?> resolve(String s) throws ScriptException, IOException {
090        // A bit nasty : will improve that later
091        CRaSHSession session = (CRaSHSession)getSession();
092        PipeLineParser parser= new PipeLineParser(s);
093        PipeLineFactory factory = parser.parse();
094        try {
095          return factory.create(session);
096        }
097        catch (NoSuchCommandException e) {
098          throw new ScriptException(e);
099        }
100      }
101    
102      public Class<P> getConsumedType() {
103        return producerContext.getConsumedType();
104      }
105    
106      public String getProperty(String propertyName) {
107        return producerContext.getProperty(propertyName);
108      }
109    
110      public String readLine(String msg, boolean echo) {
111        return producerContext.readLine(msg, echo);
112      }
113    
114      public int getWidth() {
115        return producerContext.getWidth();
116      }
117    
118      public int getHeight() {
119        return producerContext.getHeight();
120      }
121    
122      public void provide(P element) throws IOException {
123        producerContext.provide(element);
124      }
125    
126      public void flush() throws IOException {
127        producerContext.flush();
128      }
129    
130      public Map<String, Object> getSession() {
131        return sessionContext.getSession();
132      }
133    
134      public Map<String, Object> getAttributes() {
135        return sessionContext.getAttributes();
136      }
137    
138      public InvocationContextImpl<P> leftShift(Object o) throws IOException {
139        if (producerContext.getConsumedType().isInstance(o)) {
140          P p = producerContext.getConsumedType().cast(o);
141          producerContext.provide(p);
142        }
143        return this;
144      }
145    }