/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jpa.tools.swing;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import javax.swing.text.AttributeSet;
import javax.swing.text.StyleContext;
/**
* An output stream that uses a {@link ScrollingTextPane} as its sink.
* Flushes the buffer at line end.
*
* @author Pinaki Poddar
*
*/
public class GraphicOutputStream extends OutputStream {
ScrollingTextPane _sink;
private char[] buffer = new char[1024];
private int count;
private Map<String, AttributeSet> _styles = new HashMap<String, AttributeSet>();
private static AttributeSet _defaultStyle = StyleContext.getDefaultStyleContext()
.getStyle(StyleContext.DEFAULT_STYLE);
public GraphicOutputStream(ScrollingTextPane delegate) {
_sink = delegate;
}
public void registerStyle(String pattern, AttributeSet style) {
_styles.put(pattern, style);
}
@Override
public void write(int b) throws IOException {
buffer[count++] = (char)b;
if (count > buffer.length || b == '\r' || b == '\n') {
flushBuffer();
}
}
private void flushBuffer() {
String txt = new String(buffer, 0, count);
count = 0;
AttributeSet style = getStyle(txt);
_sink.setCharacterAttributes(style, true);
_sink.appendText(txt);
}
AttributeSet getStyle(String txt) {
if (txt == null || txt.isEmpty())
return _defaultStyle;
for (String pattern : _styles.keySet()) {
if (txt.startsWith(pattern))
return _styles.get(pattern);
}
return _defaultStyle;
}
}