Class QueryParserUtil

This class defines utility methods to (help) parse query strings into Lucene.Net.Search.Query objects.

Inheritance

System.Object

QueryParserUtil

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: Lucene.Net.QueryParsers.Flexible.Standard

Assembly: Lucene.Net.QueryParser.dll

Syntax

public sealed class QueryParserUtil

Methods

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Escape(String)

Returns a string where those characters that TextParser expects to be escaped are escaped by a preceding </code>.

Declaration

public static string Escape(string s)

Parameters

Type	Name	Description
System.String	s

Returns

Type	Description
System.String

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Parse(String, String[], Occur[], Analyzer)

Parses a query, searching on the fields specified. Use this if you need to specify certain fields as required, and others as prohibited.

Usage:

string[] fields = {"filename", "contents", "description"};
Occur[] flags = {Occur.SHOULD,
    Occur.MUST,
    Occur.MUST_NOT};
MultiFieldQueryParser.Parse("query", fields, flags, analyzer);

The code above would construct a query:

(filename:query) +(contents:query) -(description:query)

Declaration

public static Query Parse(string query, string[] fields, Occur[] flags, Analyzer analyzer)

Parameters

Type	Name	Description
System.String	query	Query string to parse
System.String[]	fields	Fields to search on
Lucene.Net.Search.Occur[]	flags	Flags describing the fields
Lucene.Net.Analysis.Analyzer	analyzer	Analyzer to use

Returns

Type	Description
Lucene.Net.Search.Query

Exceptions

Type	Condition
System.ArgumentException	if the length of the fields array differs from the length of the flags array

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Parse(String[], String[], Analyzer)

Parses a query which searches on the fields specified.

If x fields are specified, this effectively constructs:

(field1:query1) (field2:query2) (field3:query3)...(fieldx:queryx)

Declaration

public static Query Parse(string[] queries, string[] fields, Analyzer analyzer)

Parameters

Type	Name	Description
System.String[]	queries	Queries strings to parse
System.String[]	fields	Fields to search on
Lucene.Net.Analysis.Analyzer	analyzer	Analyzer to use

Returns

Type	Description
Lucene.Net.Search.Query

Exceptions

Type	Condition
System.ArgumentException	if the length of the queries array differs from the length of the fields array

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Parse(String[], String[], Occur[], Analyzer)

Parses a query, searching on the fields specified. Use this if you need to specify certain fields as required, and others as prohibited.

Usage:

string[] query = {"query1", "query2", "query3"};
string[] fields = {"filename", "contents", "description"};
Occur[] flags = {Occur.SHOULD,
    Occur.MUST,
    Occur.MUST_NOT};
MultiFieldQueryParser.Parse(query, fields, flags, analyzer);

The code above would construct a query:

(filename:query1) +(contents:query2) -(description:query3)

Declaration

public static Query Parse(string[] queries, string[] fields, Occur[] flags, Analyzer analyzer)

Parameters

Type	Name	Description
System.String[]	queries	Queries string to parse
System.String[]	fields	Fields to search on
Lucene.Net.Search.Occur[]	flags	Flags describing the fields
Lucene.Net.Analysis.Analyzer	analyzer	Analyzer to use

Returns

Type	Description
Lucene.Net.Search.Query

Exceptions

Type	Condition
System.ArgumentException	if the length of the queries, fields, and flags array differ