1 package org.apache.lucene.search.highlight;
3 * Licensed to the Apache Software Foundation (ASF) under one or more
4 * contributor license agreements. See the NOTICE file distributed with
5 * this work for additional information regarding copyright ownership.
6 * The ASF licenses this file to You under the Apache License, Version 2.0
7 * (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
20 * Formats text with different color intensity depending on the score of the
21 * term using the span tag. GradientFormatter uses a bgcolor argument to the font tag which
22 * doesn't work in Mozilla, thus this class.
24 * @see GradientFormatter
28 public class SpanGradientFormatter
29 extends GradientFormatter
31 public SpanGradientFormatter(float maxScore, String minForegroundColor,
32 String maxForegroundColor, String minBackgroundColor,
33 String maxBackgroundColor)
35 super( maxScore, minForegroundColor,
36 maxForegroundColor, minBackgroundColor,
43 public String highlightTerm(String originalText, TokenGroup tokenGroup)
45 if (tokenGroup.getTotalScore() == 0)
47 float score = tokenGroup.getTotalScore();
53 // try to size sb correctly
54 StringBuilder sb = new StringBuilder( originalText.length() + EXTRA);
56 sb.append("<span style=\"");
57 if (highlightForeground)
60 sb.append(getForegroundColorString(score));
63 if (highlightBackground)
65 sb.append("background: ");
66 sb.append(getBackgroundColorString(score));
70 sb.append(originalText);
75 // guess how much extra text we'll add to the text we're highlighting to try to avoid a StringBuilder resize
76 private static final String TEMPLATE = "<span style=\"background: #EEEEEE; color: #000000;\">...</span>";
77 private static final int EXTRA = TEMPLATE.length();