/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.fonts.text.whitespace;
import org.pentaho.reporting.libraries.fonts.text.ClassificationProducer;
/**
* Creation-Date: 11.06.2006, 20:11:17
*
* @author Thomas Morgner
*/
public class DiscardWhiteSpaceFilter implements WhiteSpaceFilter {
public static final char ZERO_WIDTH = '\u200B';
private boolean lastWasWhiteSpace;
public DiscardWhiteSpaceFilter() {
}
/**
* Reset the filter to the same state as if the filter had been constructed but not used yet.
*/
public void reset() {
lastWasWhiteSpace = false;
}
/**
* Filters the whitespaces. This method returns '-1', if the whitespace should be removed from the stream; otherwise
* it presents a replacement character. If the codepoint is no whitespace at all, the codepoint is returned
* unchanged.
*
* @param codepoint
* @return
*/
public int filter( final int codepoint ) {
if ( Character.isWhitespace( (char) codepoint ) ) {
if ( lastWasWhiteSpace == false ) {
lastWasWhiteSpace = true;
return DiscardWhiteSpaceFilter.ZERO_WIDTH;
}
return WhiteSpaceFilter.STRIP_WHITESPACE;
}
if ( codepoint == ClassificationProducer.START_OF_TEXT ) {
lastWasWhiteSpace = true;
return WhiteSpaceFilter.STRIP_WHITESPACE;
} else if ( codepoint == ClassificationProducer.END_OF_TEXT ) {
// do not modify the whitespace flag ..
return WhiteSpaceFilter.STRIP_WHITESPACE;
}
lastWasWhiteSpace = false;
return codepoint;
}
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}