lucene自定义排序

lucene能够很方便的实现自定义排序

具体做法就是写一个类实现SortComparatorSource这个接口

在类里返回ScoreDocComparator

实现ScoreDocComparator 的三个方法compare,sortValue,sortType就行了

public class MyComparatorSource implements SortComparatorSource {  
private static final long serialVersionUID = 1L;  
      

       
     // 返回ScoreDocComparator 用来实现排序功能  
     public ScoreDocComparator newComparator(IndexReader reader, String fieldname) throws IOException {  
         return new DistanceScoreDocLookupComparator();  
     }  
       
      private static class DistanceScoreDocLookupComparator implements ScoreDocComparator {  
          //这里写实现自己的排序比较方法
         public int compare(ScoreDoc i, ScoreDoc j) {  
             if (i.score > j.score) return -1;
             if (i.score < j.score) return 1;
             return 0;
         }  
           
         // 返回值  
         public Comparable sortValue(ScoreDoc i) {
                      return new Float(i.score);  
         }  
           
         //指定SortType  
         public int sortType() {  
             return SortField.FLOAT;  
        }  
  }
}