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From dspen...@apache.org
Subject cvs commit: jakarta-lucene-sandbox/contributions/highlighter/src/java/org/apache/lucene/search/highlight SpanGradientFormatter.java
Date Fri, 07 Jan 2005 22:35:16 GMT
dspencer    2005/01/07 14:35:15

  Added:       contributions/highlighter/src/java/org/apache/lucene/search/highlight
                        SpanGradientFormatter.java
  Log:
  Use <span> instead of <font> (as in GradientFormatter) to keep Mozilla happy.
  
  Revision  Changes    Path
  1.1                  jakarta-lucene-sandbox/contributions/highlighter/src/java/org/apache/lucene/search/highlight/SpanGradientFormatter.java
  
  Index: SpanGradientFormatter.java
  ===================================================================
  package org.apache.lucene.search.highlight;
  /**
   * Copyright 2002-2004 The Apache Software Foundation
   *
   * 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.
   */
  
  /**
   * Formats text with different color intensity depending on the score of the
   * term using the span tag.  GradientFormatter uses a bgcolor argument to the font tag which
   * doesn't work in Mozilla, thus this class.
   *
   * @see GradientFormatter
   * @author David Spencer dave@searchmorph.com
   */
  
  import org.apache.lucene.search.highlight.*;
  
  public class SpanGradientFormatter
  	extends GradientFormatter
  {
  	public SpanGradientFormatter(float maxScore, String minForegroundColor,
              String maxForegroundColor, String minBackgroundColor,
              String maxBackgroundColor)
      {
  		super( maxScore, minForegroundColor,
  			   maxForegroundColor, minBackgroundColor,
  			   maxBackgroundColor);
  	}
  	
  
  	
  	public String highlightTerm(String originalText, TokenGroup tokenGroup)
      {
          if (tokenGroup.getTotalScore() == 0)
              return originalText;
          float score = tokenGroup.getTotalScore();
          if (score == 0)
          {
              return originalText;
          }
  
  		// try to size sb correctly
          StringBuffer sb = new StringBuffer( originalText.length() + EXTRA);
  		
  		sb.append("<span style=\""); 
  		if (highlightForeground) 
  		{
  			sb.append("color: "); 
  			sb.append(getForegroundColorString(score)); 
  			sb.append("; "); 
  		}
  		if (highlightBackground)
  		{
  			sb.append("background: ");
  			sb.append(getBackgroundColorString(score));
  			sb.append("; ");
  		}
  		sb.append("\">");
  		sb.append(originalText);
  		sb.append("</span>");
          return sb.toString();
      }
  
  	// guess how much extra text we'll add to the text we're highlighting to try to avoid a
 StringBuffer resize
  	private static final String TEMPLATE = "<span style=\"background: #EEEEEE; color: #000000;\">...</span>";
  	private static final int EXTRA = TEMPLATE.length();	
  }
  
  
  

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