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