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.text;
021    
022    import org.crsh.shell.ScreenContext;
023    
024    import java.io.Closeable;
025    import java.io.IOException;
026    import java.io.Writer;
027    import java.nio.CharBuffer;
028    
029    public class RenderWriter extends Writer implements ScreenContext {
030    
031      /** . */
032      private final ScreenContext out;
033    
034      /** . */
035      private final Closeable closeable;
036    
037      /** . */
038      private boolean closed;
039    
040      /** . */
041      private boolean empty;
042    
043      public RenderWriter(ScreenContext out) throws NullPointerException {
044        this(out, null);
045      }
046    
047      public RenderWriter(ScreenContext out, Closeable closeable) throws NullPointerException {
048        if (out == null) {
049          throw new NullPointerException("No null appendable expected");
050        }
051    
052        //
053        this.out = out;
054        this.empty = true;
055        this.closeable = closeable;
056      }
057    
058      public boolean isEmpty() {
059        return empty;
060      }
061    
062      public int getWidth() {
063        return out.getWidth();
064      }
065    
066      public int getHeight() {
067        return out.getHeight();
068      }
069    
070      public Class<Chunk> getConsumedType() {
071        return Chunk.class;
072      }
073    
074      public void write(Chunk chunk) throws IOException {
075        provide(chunk);
076      }
077    
078      public void provide(Chunk element) throws IOException {
079        if (element instanceof Text) {
080          Text text = (Text)element;
081          empty &= text.getText().length() == 0;
082        }
083        out.write(element);
084      }
085    
086      @Override
087      public void write(char[] cbuf, int off, int len) throws IOException {
088        if (closed) {
089          throw new IOException("Already closed");
090        }
091        if (len > 0) {
092          provide(Text.create(new String(cbuf, off, len)));
093        }
094      }
095    
096      @Override
097      public void flush() throws IOException {
098        if (closed) {
099          throw new IOException("Already closed");
100        }
101        out.flush();
102      }
103    
104      @Override
105      public void close() throws IOException {
106        if (!closed) {
107          closed = true;
108          if (closeable != null) {
109            closeable.close();
110          }
111        }
112      }
113    }