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.shell.impl.command;
021    
022    import org.crsh.Pipe;
023    import org.crsh.command.BaseCommandContext;
024    import org.crsh.command.InvocationContext;
025    import org.crsh.shell.ShellProcessContext;
026    import org.crsh.text.Chunk;
027    import org.crsh.text.RenderingContext;
028    import org.crsh.text.RenderPrintWriter;
029    
030    import java.io.IOException;
031    import java.util.Map;
032    
033    public class CRaSHInvocationContext<P> extends BaseCommandContext implements InvocationContext<P> {
034    
035      /** . */
036      private final ShellProcessContext processContext;
037    
038      /** . */
039      private RenderPrintWriter writer;
040    
041      /** . */
042      protected Pipe<Object> producer;
043    
044      protected CRaSHInvocationContext(
045          ShellProcessContext processContext,
046          Map<String, Object> session,
047          Map<String, Object> attributes,
048          Pipe<Object> producer) {
049        super(session, attributes);
050    
051        //
052        this.processContext = processContext;
053        this.producer = producer;
054      }
055    
056      public int getWidth() {
057        return processContext.getWidth();
058      }
059    
060      public int getHeight() {
061        return processContext.getHeight();
062      }
063    
064      public String getProperty(String propertyName) {
065        return processContext.getProperty(propertyName);
066      }
067    
068      public String readLine(String msg, boolean echo) {
069        return processContext.readLine(msg, echo);
070      }
071    
072      public void provide(P element) throws IOException {
073        producer.provide(element);
074      }
075    
076      public void flush() throws IOException {
077        producer.flush();
078      }
079    
080      public RenderPrintWriter getWriter() {
081        if (writer == null) {
082          writer = new RenderPrintWriter(new RenderingContext() {
083            public int getWidth() {
084              return processContext.getWidth();
085            }
086            public void provide(Chunk element) throws IOException {
087              producer.provide(element);
088            }
089            public void flush() throws IOException {
090              producer.flush();
091            }
092          });
093        }
094        return writer;
095      }
096    }