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