SquareFilter.java

/*
 * This file is part of "SnipSnap Radeox Rendering Engine".
 *
 * Copyright (c) 2002 Stephan J. Schmidt, Matthias L. Jugel
 * All Rights Reserved.
 *
 * Please visit http://radeox.org/ for updates and contact.
 *
 * --LICENSE NOTICE--
 * 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.
 * --LICENSE NOTICE--
 */

package examples;

import org.radeox.filter.regex.RegexTokenFilter;
import org.radeox.regex.MatchResult;
import org.radeox.filter.context.FilterContext;

// cut:start-1
public class SquareFilter extends RegexTokenFilter {
  public SquareFilter() {
    super("\\$[0-9]+", true);
  };

  public void handleMatch(StringBuffer buffer,
                          MatchResult result,
                          FilterContext context) {
    // group(0) will e.g. return "$3" so we have to cut the $
    int number = Integer.parseInt(
        result.group(0).substring(1));
    buffer.append(number*number);
  }
}
// cut:end-1