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.Consumer;
023    import org.crsh.text.Chunk;
024    import org.crsh.shell.ScreenContext;
025    import org.crsh.text.RenderPrintWriter;
026    
027    import java.io.IOException;
028    import java.util.Map;
029    
030    class InnerInvocationContext<P> implements InvocationContext<P> {
031    
032      /** . */
033      final InvocationContext<?> outter;
034    
035      /** . */
036      final Consumer<P> consumer;
037    
038      /** . */
039      private RenderPrintWriter writer;
040    
041      /** . */
042      private final boolean piped;
043    
044      InnerInvocationContext(
045        InvocationContext<?> outter,
046        Consumer<P> consumer,
047        boolean piped) {
048    
049        //
050        this.outter = outter;
051        this.consumer = consumer;
052        this.piped = piped;
053      }
054    
055      public boolean isPiped() {
056        return piped;
057      }
058    
059      public CommandInvoker<?, ?> resolve(String s) throws ScriptException, IOException {
060        return outter.resolve(s);
061      }
062    
063      public int getWidth() {
064        return outter.getWidth();
065      }
066    
067      public int getHeight() {
068        return outter.getHeight();
069      }
070    
071      public boolean takeAlternateBuffer() throws IOException {
072        return outter.takeAlternateBuffer();
073      }
074    
075      public boolean releaseAlternateBuffer() throws IOException {
076        return outter.releaseAlternateBuffer();
077      }
078    
079      public String getProperty(String propertyName) {
080        return outter.getProperty(propertyName);
081      }
082    
083      public String readLine(String msg, boolean echo) {
084        return outter.readLine(msg, echo);
085      }
086    
087      public RenderPrintWriter getWriter() {
088        if (writer == null) {
089          writer = new RenderPrintWriter(new ScreenContext<Chunk>() {
090            public Class<Chunk> getConsumedType() {
091              return Chunk.class;
092            }
093            public int getWidth() {
094              return outter.getWidth();
095            }
096            public int getHeight() {
097              return outter.getHeight();
098            }
099            public void provide(Chunk element) throws IOException {
100              Class<P> consumedType = consumer.getConsumedType();
101              if (consumedType.isInstance(element)) {
102                P p = consumedType.cast(element);
103                consumer.provide(p);
104              }
105            }
106            public void flush() throws IOException {
107              consumer.flush();
108            }
109          });
110        }
111        return writer;
112      }
113    
114      public Class<P> getConsumedType() {
115        return consumer.getConsumedType();
116      }
117    
118      public void provide(P element) throws IOException {
119        consumer.provide(element);
120      }
121    
122      public void flush() throws IOException {
123        consumer.flush();
124      }
125    
126      public void close() throws IOException {
127        // Nothing to do
128      }
129    
130      public Map<String, Object> getSession() {
131        return outter.getSession();
132      }
133    
134      public Map<String, Object> getAttributes() {
135        return outter.getAttributes();
136      }
137    }