从DocsAndPositionsEnum中检索所有术语位置

Question

我正在升级到Solr 4.1,并且无法使用新API检索位置和偏移信息.我的索引包含一个文档,其中一个字段包含字符串' 一只快速的棕色狐狸跳过一只懒狗 '.我正在查询我的索引'one'并尝试检索对应于'one'的位置和偏移量.

这是代码片段

Terms terms=reader.getTermVector(docId, fieldName);
TermsEnum termsEnum= terms.iterator(TermsEnum.EMPTY);
    BytesRef term;
    while((term=termsEnum.next())!=null){
        String docTerm = term.utf8ToString();
        DocsAndPositionsEnum docPosEnum = termsEnum.docsAndPositions(null, null, DocsAndPositionsEnum.FLAG_OFFSETS);
        //Check if the current term is the same as the query term and if so
        //retrieve all positions (can be multiple occurrences of a term in a field) corresponding to the term
        if (queryTerms.contains(docTerm)) {
            int position;
            while((position=docPosEnum.nextPosition())!=-1){
                int start=docPosEnum.startOffset();
                int end=docPosEnum.endOffset();
                //Store start, end and position in an a list
                }
        }
    }

内部while循环不正确.任何关于如何遍历DocsAndPositionsEnum中所有位置的指针都将非常感激.

Answer 1

这对我有用

Terms terms=reader.getTermVector(docId, fieldName);
TermsEnum termsEnum= terms.iterator(TermsEnum.EMPTY);
BytesRef term;
while((term=termsEnum.next())!=null){
            String docTerm = term.utf8ToString();
            //Check if the current term is the same as the query term and if so
            //retrieve all positions (can be multiple occurrences of a term in a field) corresponding to the term
            if (queryTerms.contains(docTerm)) {
                DocsAndPositionsEnum docPosEnum = termsEnum.docsAndPositions(null, null, DocsAndPositionsEnum.FLAG_OFFSETS);
                docPosEnum.nextDoc();
                //Retrieve the term frequency in the current document
                int freq=docPosEnum.freq();
                for(int i=0; i<freq; i++){
                    int position=docPosEnum.nextPosition();
                    int start=docPosEnum.startOffset();
                    int end=docPosEnum.endOffset();
                    //Store start, end and position in a list
                    }
            }
    }