Class MultiFieldQueryParser

A QueryParser which constructs queries to search multiple fields.

Inheritance
System.Object
QueryParserBase
QueryParser
MultiFieldQueryParser
Inherited Members
Namespace: Lucene.Net.QueryParsers.Classic
Assembly: Lucene.Net.QueryParser.dll
Syntax
public class MultiFieldQueryParser : QueryParser, ICommonQueryParserConfiguration

Constructors

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MultiFieldQueryParser(LuceneVersion, String[], Analyzer)

Creates a MultiFieldQueryParser.

It will, when Parse(String) is called, construct a query like this (assuming the query consists of two terms and you specify the two fields title and body): 

(title:term1 body:term1) (title:term2 body:term2)

When DefaultOperator is set to AND_OPERATOR, the result will be: 

+(title:term1 body:term1) +(title:term2 body:term2)

In other words, all the query's terms must appear, but it doesn't matter in what fields they appear.

Declaration
public MultiFieldQueryParser(LuceneVersion matchVersion, string[] fields, Analyzer analyzer)
Parameters
Type Name Description
LuceneVersion matchVersion
System.String[] fields
Analyzer analyzer
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MultiFieldQueryParser(LuceneVersion, String[], Analyzer, IDictionary<String, Single>)

Creates a MultiFieldQueryParser. Allows passing of a map with term to Boost, and the boost to apply to each term.

It will, when Parse(String) is called, construct a query like this (assuming the query consists of two terms and you specify the two fields title and body): 

(title:term1 body:term1) (title:term2 body:term2)

When DefaultOperator is set to AND_OPERATOR, the result will be: 

+(title:term1 body:term1) +(title:term2 body:term2)

When you pass a boost (title=>5 body=>10) you can get 

+(title:term1^5.0 body:term1^10.0) +(title:term2^5.0 body:term2^10.0)

In other words, all the query's terms must appear, but it doesn't matter in what fields they appear.

Declaration
public MultiFieldQueryParser(LuceneVersion matchVersion, string[] fields, Analyzer analyzer, IDictionary<string, float> boosts)
Parameters
Type Name Description
LuceneVersion matchVersion
System.String[] fields
Analyzer analyzer
IDictionary<System.String, System.Single> boosts

Fields

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m_boosts

Declaration
protected IDictionary<string, float> m_boosts
Field Value
Type Description
IDictionary<System.String, System.Single>
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m_fields

Declaration
protected string[] m_fields
Field Value
Type Description
System.String[]

Methods

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GetFieldQuery(String, String, Boolean)

Declaration
protected override Query GetFieldQuery(string field, string queryText, bool quoted)
Parameters
Type Name Description
System.String field
System.String queryText
System.Boolean quoted
Returns
Type Description
Query
Overrides
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GetFieldQuery(String, String, Int32)

Declaration
protected override Query GetFieldQuery(string field, string queryText, int slop)
Parameters
Type Name Description
System.String field
System.String queryText
System.Int32 slop
Returns
Type Description
Query
Overrides
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GetFuzzyQuery(String, String, Single)

Declaration
protected override Query GetFuzzyQuery(string field, string termStr, float minSimilarity)
Parameters
Type Name Description
System.String field
System.String termStr
System.Single minSimilarity
Returns
Type Description
Query
Overrides
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GetPrefixQuery(String, String)

Declaration
protected override Query GetPrefixQuery(string field, string termStr)
Parameters
Type Name Description
System.String field
System.String termStr
Returns
Type Description
Query
Overrides
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GetRangeQuery(String, String, String, Boolean, Boolean)

Declaration
protected override Query GetRangeQuery(string field, string part1, string part2, bool startInclusive, bool endInclusive)
Parameters
Type Name Description
System.String field
System.String part1
System.String part2
System.Boolean startInclusive
System.Boolean endInclusive
Returns
Type Description
Query
Overrides
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GetRegexpQuery(String, String)

Declaration
protected override Query GetRegexpQuery(string field, string termStr)
Parameters
Type Name Description
System.String field
System.String termStr
Returns
Type Description
Query
Overrides
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GetWildcardQuery(String, String)

Declaration
protected override Query GetWildcardQuery(string field, string termStr)
Parameters
Type Name Description
System.String field
System.String termStr
Returns
Type Description
Query
Overrides
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Parse(LuceneVersion, 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(LuceneVersion matchVersion, string query, string[] fields, Occur[] flags, Analyzer analyzer)
Parameters
Type Name Description
LuceneVersion matchVersion

Lucene version to match; this is passed through to QueryParser.
System.String query

Query string to parse
System.String[] fields

Fields to search on
Occur[] flags

Flags describing the fields
Analyzer analyzer

Analyzer to use
Returns
Type Description
Query
Exceptions
Type Condition
ParseException

if query parsing fails
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Parse(LuceneVersion, 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(LuceneVersion matchVersion, string[] queries, string[] fields, Analyzer analyzer)
Parameters
Type Name Description
LuceneVersion matchVersion

Lucene version to match; this is passed through to QueryParser.
System.String[] queries

Queries strings to parse
System.String[] fields

Fields to search on
Analyzer analyzer

Analyzer to use
Returns
Type Description
Query
Exceptions
Type Condition
ParseException

if query parsing fails
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Parse(LuceneVersion, 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(LuceneVersion matchVersion, string[] queries, string[] fields, Occur[] flags, Analyzer analyzer)
Parameters
Type Name Description
LuceneVersion matchVersion

Lucene version to match; this is passed through to QueryParser.
System.String[] queries

Queries string to parse
System.String[] fields

Fields to search on
Occur[] flags

Flags describing the fields
Analyzer analyzer

Analyzer to use
Returns
Type Description
Query
Exceptions
Type Condition
ParseException

if query parsing fails

Implements