/// <summary> Parses a query, searching on the fields specified. Use this if you need /// to specify certain fields as required, and others as prohibited. /// <p/> /// /// <pre> /// Usage: /// <code> /// String[] query = {"query1", "query2", "query3"}; /// String[] fields = {"filename", "contents", "description"}; /// BooleanClause.Occur[] flags = {BooleanClause.Occur.SHOULD, /// BooleanClause.Occur.MUST, /// BooleanClause.Occur.MUST_NOT}; /// MultiFieldQueryParser.parse(query, fields, flags, analyzer); /// </code> /// </pre> /// <p/> /// The code above would construct a query: /// /// <pre> /// <code> /// (filename:query1) +(contents:query2) -(description:query3) /// </code> /// </pre> /// /// </summary> /// <param name="matchVersion">Lucene version to match; this is passed through to /// QueryParser. /// </param> /// <param name="queries">Queries string to parse /// </param> /// <param name="fields">Fields to search on /// </param> /// <param name="flags">Flags describing the fields /// </param> /// <param name="analyzer">Analyzer to use /// </param> /// <throws> ParseException </throws> /// <summary> if query parsing fails /// </summary> /// <throws> IllegalArgumentException </throws> /// <summary> if the length of the queries, fields, and flags array differ /// </summary> public static Query Parse(Version matchVersion, System.String[] queries, System.String[] fields, BooleanClause.Occur[] flags, Analyzer analyzer) { if (!(queries.Length == fields.Length && queries.Length == flags.Length)) throw new System.ArgumentException("queries, fields, and flags array have have different length"); BooleanQuery bQuery = new BooleanQuery(); for (int i = 0; i < fields.Length; i++) { QueryParser qp = new QueryParser(matchVersion, fields[i], analyzer); Query q = qp.Parse(queries[i]); if (q != null && (!(q is BooleanQuery) || ((BooleanQuery) q).GetClauses().Length > 0)) { bQuery.Add(q, flags[i]); } } return bQuery; }
/// <summary> Builds a new BooleanClause instance</summary> /// <param name="q">sub query /// </param> /// <param name="occur">how this clause should occur when matching documents /// </param> /// <returns> new BooleanClause instance /// </returns> protected internal virtual BooleanClause NewBooleanClause(Query q, BooleanClause.Occur occur) { return new BooleanClause(q, occur); }
public static Query Parse(System.String[] queries, System.String[] fields, BooleanClause.Occur[] flags, Analyzer analyzer) { return Parse(Version.LUCENE_24, queries, fields, flags, analyzer); }