import org.apache.lucene.search.postingshighlight.PassageFormatter; //导入依赖的package包/类
@Override
protected PassageFormatter getFormatter(String fieldName) {
  String preTag = params.getFieldParam(fieldName, HighlightParams.TAG_PRE, "<em>");
  String postTag = params.getFieldParam(fieldName, HighlightParams.TAG_POST, "</em>");
  String ellipsis = params.getFieldParam(fieldName, HighlightParams.TAG_ELLIPSIS, "... ");
  String encoder = params.getFieldParam(fieldName, HighlightParams.ENCODER, "simple");
  return new DefaultPassageFormatter(preTag, postTag, ellipsis, "html".equals(encoder));
}
 

import org.apache.lucene.search.postingshighlight.PassageFormatter; //导入依赖的package包/类
@Override
protected PassageFormatter getFormatter(String fieldName) {
  String preTag = params.getFieldParam(fieldName, HighlightParams.TAG_PRE, "<em>");
  String postTag = params.getFieldParam(fieldName, HighlightParams.TAG_POST, "</em>");
  String ellipsis = params.getFieldParam(fieldName, HighlightParams.TAG_ELLIPSIS, "... ");
  String encoder = params.getFieldParam(fieldName, HighlightParams.ENCODER, "simple");
  return new HighlightFormatter(preTag, postTag, ellipsis, "html".equals(encoder));
}
 

import org.apache.lucene.search.postingshighlight.PassageFormatter; //导入依赖的package包/类
@Override
public void init(PluginInfo info) {
  Map<String,String> attributes = info.attributes;
  BreakIterator breakIterator = BreakIterator.getSentenceInstance(Locale.ROOT);
  PassageScorer scorer = new PassageScorer();
  
  // formatter parameters: preTag/postTag/ellipsis
  String preTag = attributes.get("preTag");
  if (preTag == null) {
    preTag = "<em>";
  }
  String postTag = attributes.get("postTag");
  if (postTag == null) {
    postTag = "</em>";
  }
  String ellipsis = attributes.get("ellipsis");
  if (ellipsis == null) {
    ellipsis = "... ";
  }
  PassageFormatter formatter = new PassageFormatter(preTag, postTag, ellipsis);
  
  // maximum content size to process
  int maxLength = PostingsHighlighter.DEFAULT_MAX_LENGTH;
  if (attributes.containsKey("maxLength")) {
    maxLength = Integer.parseInt(attributes.get("maxLength"));
  }
  highlighter = new PostingsHighlighter(maxLength, breakIterator, scorer, formatter);
}