Example usage for org.apache.lucene.index FieldInfos hasOffsets

Introduction

In this page you can find the example usage for org.apache.lucene.index FieldInfos hasOffsets.

Prototype

boolean hasOffsets

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Usage

From source file:org.apache.jackrabbit.oak.plugins.index.lucene.LucenePropertyIndex.java

License:Apache License

private String getExcerpt(Query query, Analyzer analyzer, IndexSearcher searcher, ScoreDoc doc,
        FieldInfos fieldInfos) throws IOException {
    StringBuilder excerpt = new StringBuilder();
    int docID = doc.doc;
    List<String> names = new LinkedList<String>();

    for (IndexableField field : searcher.getIndexReader().document(docID).getFields()) {
        String name = field.name();
        // postings highlighter can be used on analyzed fields with docs, freqs, positions and offsets stored.
        if (name.startsWith(ANALYZED_FIELD_PREFIX) && fieldInfos.hasProx() && fieldInfos.hasOffsets()) {
            names.add(name);/*from w  w  w  . jav  a  2s  .co  m*/
        }
    }

    if (names.size() > 0) {
        int[] maxPassages = new int[names.size()];
        for (int i = 0; i < maxPassages.length; i++) {
            maxPassages[i] = 1;
        }
        try {
            Map<String, String[]> stringMap = postingsHighlighter.highlightFields(
                    names.toArray(new String[names.size()]), query, searcher, new int[] { docID }, maxPassages);
            for (Map.Entry<String, String[]> entry : stringMap.entrySet()) {
                String value = Arrays.toString(entry.getValue());
                if (value.contains("<b>")) {
                    if (excerpt.length() > 0) {
                        excerpt.append("...");
                    }
                    excerpt.append(value);
                }
            }
        } catch (Exception e) {
            LOG.error("postings highlighting failed", e);
        }
    }

    // fallback if no excerpt could be retrieved using postings highlighter
    if (excerpt.length() == 0) {

        for (IndexableField field : searcher.getIndexReader().document(doc.doc).getFields()) {
            String name = field.name();
            // only full text or analyzed fields
            if (name.startsWith(FieldNames.FULLTEXT) || name.startsWith(FieldNames.ANALYZED_FIELD_PREFIX)) {
                String text = field.stringValue();
                TokenStream tokenStream = analyzer.tokenStream(name, text);

                try {
                    TextFragment[] textFragments = highlighter.getBestTextFragments(tokenStream, text, true, 1);
                    if (textFragments != null && textFragments.length > 0) {
                        for (TextFragment fragment : textFragments) {
                            if (excerpt.length() > 0) {
                                excerpt.append("...");
                            }
                            excerpt.append(fragment.toString());
                        }
                        break;
                    }
                } catch (InvalidTokenOffsetsException e) {
                    LOG.error("higlighting failed", e);
                }
            }
        }
    }
    return excerpt.toString();
}

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