Example usage for org.apache.lucene.index LeafReader maxDoc

Introduction

In this page you can find the example usage for org.apache.lucene.index LeafReader maxDoc.

Prototype

public abstract int maxDoc();

Source Link

Document

Returns one greater than the largest possible document number.

Usage

From source file:uk.co.flax.luwak.presearcher.FieldFilterPresearcherComponent.java

License:Apache License

private Query buildFilterClause(LeafReader reader) throws IOException {

    Terms terms = reader.fields().terms(field);
    if (terms == null)
        return null;

    BooleanQuery.Builder bq = new BooleanQuery.Builder();

    int docsInBatch = reader.maxDoc();

    BytesRef term;/*from w w w  . j  ava2  s .  com*/
    TermsEnum te = terms.iterator();
    while ((term = te.next()) != null) {
        // we need to check that every document in the batch has the same field values, otherwise
        // this filtering will not work
        if (te.docFreq() != docsInBatch)
            throw new IllegalArgumentException("Some documents in this batch do not have a term value of "
                    + field + ":" + Term.toString(term));
        bq.add(new TermQuery(new Term(field, BytesRef.deepCopyOf(term))), BooleanClause.Occur.SHOULD);
    }

    BooleanQuery built = bq.build();

    if (built.clauses().size() == 0)
        return null;

    return built;
}