001    /*
002     * Copyright (C) 2010 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;
021    
022    import org.crsh.command.InvocationContext;
023    import org.crsh.shell.ShellProcessContext;
024    import org.crsh.shell.io.ShellPrinter;
025    import org.crsh.util.LineFeedWriter;
026    
027    import java.io.StringWriter;
028    import java.util.Collections;
029    import java.util.LinkedList;
030    import java.util.List;
031    import java.util.Map;
032    
033    /**
034     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
035     * @version $Revision$
036     */
037    class InvocationContextImpl<C, P> extends CommandContextImpl implements InvocationContext<C, P> {
038    
039      /** . */
040      private final ShellProcessContext processContext;
041    
042      /** . */
043      private ShellPrinter writer;
044    
045      /** . */
046      private StringWriter buffer;
047    
048      /** . */
049      private List<P> products;
050    
051      /** . */
052      private Iterable<C> consumedItems;
053    
054      InvocationContextImpl(
055        ShellProcessContext processContext,
056        Iterable<C> consumedItems,
057        Map<String, Object> attributes) {
058        super(attributes);
059        this.processContext = processContext;
060        this.writer = null;
061        this.buffer = null;
062        this.consumedItems = consumedItems;
063        this.products = Collections.emptyList();
064      }
065    
066      public int getWidth() {
067        return processContext.getWidth();
068      }
069    
070      public List<P> getProducedItems() {
071        return products;
072      }
073    
074      public StringWriter getBuffer() {
075        return buffer;
076      }
077    
078      public boolean isPiped() {
079        return consumedItems != null;
080      }
081    
082      public Iterable<C> consume() {
083        if (consumedItems == null) {
084          throw new IllegalStateException("Cannot consume as no pipe operation is involved");
085        }
086        return consumedItems;
087      }
088    
089      public void produce(P product) {
090        if (products.isEmpty()) {
091          products = new LinkedList<P>();
092        }
093        products.add(product);
094      }
095    
096      public ShellPrinter getWriter() {
097        if (writer == null) {
098          buffer = new StringWriter();
099          writer = new ShellPrinter(new LineFeedWriter(buffer, "\r\n"));
100        }
101        return writer;
102      }
103      public String readLine(String msg, boolean echo) {
104        return processContext.readLine(msg, echo);
105      }
106    }