org.apache.lucene.queryParser
public class MultiFieldQueryParser extends QueryParser
Version: $Revision: 525682 $
Field Summary | |
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protected Map | boosts |
protected String[] | fields |
Constructor Summary | |
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MultiFieldQueryParser(String[] fields, Analyzer analyzer, Map boosts)
Creates a MultiFieldQueryParser.
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MultiFieldQueryParser(String[] fields, Analyzer analyzer)
Creates a MultiFieldQueryParser.
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Method Summary | |
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protected Query | getFieldQuery(String field, String queryText, int slop) |
protected Query | getFieldQuery(String field, String queryText) |
protected Query | getFuzzyQuery(String field, String termStr, float minSimilarity) |
protected Query | getPrefixQuery(String field, String termStr) |
protected Query | getRangeQuery(String field, String part1, String part2, boolean inclusive) |
protected Query | getWildcardQuery(String field, String termStr) |
static Query | parse(String[] queries, String[] fields, Analyzer analyzer)
Parses a query which searches on the fields specified.
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static Query | parse(String query, String[] fields, BooleanClause.Occur[] flags, Analyzer analyzer)
Parses a query, searching on the fields specified.
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static Query | parse(String[] queries, String[] fields, BooleanClause.Occur[] flags, Analyzer analyzer)
Parses a query, searching on the fields specified.
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It will, when parse(String query)
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 setDefaultOperator(AND_OPERATOR) is set, 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.
It will, when parse(String query)
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 setDefaultOperator(AND_OPERATOR) is set, 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.
If x fields are specified, this effectively constructs:
(field1:query1) (field2:query2) (field3:query3)...(fieldx:queryx)
Parameters: queries Queries strings to parse fields Fields to search on analyzer Analyzer to use
Throws: ParseException if query parsing fails IllegalArgumentException if the length of the queries array differs from the length of the fields array
Usage:
String[] fields = {"filename", "contents", "description"};
BooleanClause.Occur[] flags = {BooleanClause.Occur.SHOULD,
BooleanClause.Occur.MUST,
BooleanClause.Occur.MUST_NOT};
MultiFieldQueryParser.parse("query", fields, flags, analyzer);
The code above would construct a query:
(filename:query) +(contents:query) -(description:query)
Parameters: query Query string to parse fields Fields to search on flags Flags describing the fields analyzer Analyzer to use
Throws: ParseException if query parsing fails IllegalArgumentException if the length of the fields array differs from the length of the flags array
Usage:
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);
The code above would construct a query:
(filename:query1) +(contents:query2) -(description:query3)
Parameters: queries Queries string to parse fields Fields to search on flags Flags describing the fields analyzer Analyzer to use
Throws: ParseException if query parsing fails IllegalArgumentException if the length of the queries, fields, and flags array differ