/// <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/>
/// 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>
/// <p/>
/// The code above would construct a query:
///
/// <code>
/// (filename:query1) +(contents:query2) -(description:query3)
/// </code>
///
/// </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, 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;
}
public static void Main(String[] args)
{
if (args.Length == 0)
{
Console.WriteLine("Usage: java org.apache.lucene.queryParser.QueryParser <input>");
Environment.Exit(0);
}
QueryParser qp = new QueryParser(Version.LUCENE_CURRENT, "field", new SimpleAnalyzer());
Query q = qp.Parse(args[0]);
Console.WriteLine(q.ToString("field"));
}