org.apache.solr.search
Class ExtendedDismaxQParser

java.lang.Object
  org.apache.solr.search.QParser
      org.apache.solr.search.ExtendedDismaxQParser

public class ExtendedDismaxQParser
extends QParser

Query parser that generates DisjunctionMaxQueries based on user configuration. See Wiki page http://wiki.apache.org/solr/ExtendedDisMax

Nested Class Summary

protected static class	ExtendedDismaxQParser.Clause
class	ExtendedDismaxQParser.ExtendedDismaxConfiguration Simple container for configuration information used when parsing queries
static class	ExtendedDismaxQParser.ExtendedSolrQueryParser A subclass of SolrQueryParser that supports aliasing fields for constructing DisjunctionMaxQueries.

Field Summary

Fields inherited from class org.apache.solr.search.QParser

localParams, localParamsEnd, params, qstr, query, recurseCount, req, stringIncludingLocalParams, valFollowedParams

Constructor Summary

ExtendedDismaxQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req)

Method Summary

void	addDebugInfo(NamedList<Object> debugInfo)
protected void	addPhraseFieldQueries(BooleanQuery query, List<ExtendedDismaxQParser.Clause> clauses, ExtendedDismaxQParser.ExtendedDismaxConfiguration config) Adds shingled phrase queries to all the fields specified in the pf, pf2 anf pf3 parameters
protected void	addShingledPhraseQueries(BooleanQuery mainQuery, List<ExtendedDismaxQParser.Clause> clauses, Map<String,Float> fields, int shingleSize, float tiebreaker, int slop) Modifies the main query by adding a new optional Query consisting of shingled phrase queries across the specified clauses using the specified field => boost mappings.
protected ExtendedDismaxQParser.ExtendedDismaxConfiguration	createConfiguration(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) Creates an instance of ExtendedDismaxConfiguration.
protected ExtendedDismaxQParser.ExtendedSolrQueryParser	createEdismaxQueryParser(QParser qParser, String field) Creates an instance of ExtendedSolrQueryParser, the query parser that's going to be used to parse the query.
protected List<Query>	getBoostFunctions() Parses all function queries
protected List<Query>	getBoostQueries() Parses all boost queries
String[]	getDefaultHighlightFields()
String	getFieldName(String s, int pos, int end) returns a field name or legal field alias from the current position of the string
Query	getHighlightQuery()
protected List<ValueSource>	getMultiplicativeBoosts() Parses all multiplicative boosts
Query	parse() Create and return the Query object represented by qstr.
protected Query	parseEscapedQuery(ExtendedDismaxQParser.ExtendedSolrQueryParser up, String escapedUserQuery, ExtendedDismaxQParser.ExtendedDismaxConfiguration config) Parses an escaped version of the user's query.
protected Query	parseOriginalQuery(ExtendedDismaxQParser.ExtendedSolrQueryParser up, String mainUserQuery, List<ExtendedDismaxQParser.Clause> clauses, ExtendedDismaxQParser.ExtendedDismaxConfiguration config) Parses the user's original query.
protected String	rebuildUserQuery(List<ExtendedDismaxQParser.Clause> clauses, boolean lowercaseOperators) Generates a query string from the raw clauses, uppercasing 'and' and 'or' as needed.
protected boolean	shouldRemoveStopFilter(ExtendedDismaxQParser.ExtendedDismaxConfiguration config, Query query) Determines if query should be re-parsed removing the stop filter.
static List<String>	split(String s, boolean ignoreQuote)
List<ExtendedDismaxQParser.Clause>	splitIntoClauses(String s, boolean ignoreQuote)

Methods inherited from class org.apache.solr.search.QParser

getLocalParams, getParam, getParams, getParser, getQuery, getReq, getSort, getString, setLocalParams, setParams, setReq, setString, subQuery

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExtendedDismaxQParser

public ExtendedDismaxQParser(String qstr,
                             SolrParams localParams,
                             SolrParams params,
                             SolrQueryRequest req)

Method Detail

parse

public Query parse()
            throws SyntaxError

Description copied from class: QParser

Create and return the Query object represented by qstr. Null MAY be returned to signify there was no input (e.g. no query string) to parse.

Specified by:

parse in class QParser

Throws:

SyntaxError

See Also:

QParser.getQuery()

addPhraseFieldQueries

protected void addPhraseFieldQueries(BooleanQuery query,
                                     List<ExtendedDismaxQParser.Clause> clauses,
                                     ExtendedDismaxQParser.ExtendedDismaxConfiguration config)
                              throws SyntaxError

Adds shingled phrase queries to all the fields specified in the pf, pf2 anf pf3 parameters

Throws:

SyntaxError

createConfiguration

protected ExtendedDismaxQParser.ExtendedDismaxConfiguration createConfiguration(String qstr,
                                                                                SolrParams localParams,
                                                                                SolrParams params,
                                                                                SolrQueryRequest req)

Creates an instance of ExtendedDismaxConfiguration. It will contain all the necessary parameters to parse the query

createEdismaxQueryParser

protected ExtendedDismaxQParser.ExtendedSolrQueryParser createEdismaxQueryParser(QParser qParser,
                                                                                 String field)

Creates an instance of ExtendedSolrQueryParser, the query parser that's going to be used to parse the query.

parseEscapedQuery

protected Query parseEscapedQuery(ExtendedDismaxQParser.ExtendedSolrQueryParser up,
                                  String escapedUserQuery,
                                  ExtendedDismaxQParser.ExtendedDismaxConfiguration config)
                           throws SyntaxError

Parses an escaped version of the user's query. This method is called in the event that the original query encounters exceptions during parsing.

Parameters:

up - parser used

escapedUserQuery - query that is parsed, should already be escaped so that no trivial parse errors are encountered

config - Configuration options for this parse request

Returns:

the resulting query (flattened if needed) with "min should match" rules applied as specified in the config.

Throws:

SyntaxError

See Also:

parseOriginalQuery(org.apache.solr.search.ExtendedDismaxQParser.ExtendedSolrQueryParser, java.lang.String, java.util.List, org.apache.solr.search.ExtendedDismaxQParser.ExtendedDismaxConfiguration), SolrPluginUtils.flattenBooleanQuery(org.apache.lucene.search.BooleanQuery, org.apache.lucene.search.BooleanQuery)

parseOriginalQuery

protected Query parseOriginalQuery(ExtendedDismaxQParser.ExtendedSolrQueryParser up,
                                   String mainUserQuery,
                                   List<ExtendedDismaxQParser.Clause> clauses,
                                   ExtendedDismaxQParser.ExtendedDismaxConfiguration config)

Parses the user's original query. This method attempts to cleanly parse the specified query string using the specified parser, any Exceptions are ignored resulting in null being returned.

Parameters:

up - parser used

mainUserQuery - query string that is parsed

clauses - used to dictate "min should match" logic

config - Configuration options for this parse request

Returns:

the resulting query with "min should match" rules applied as specified in the config.

See Also:

parseEscapedQuery(org.apache.solr.search.ExtendedDismaxQParser.ExtendedSolrQueryParser, java.lang.String, org.apache.solr.search.ExtendedDismaxQParser.ExtendedDismaxConfiguration)

shouldRemoveStopFilter

protected boolean shouldRemoveStopFilter(ExtendedDismaxQParser.ExtendedDismaxConfiguration config,
                                         Query query)

Determines if query should be re-parsed removing the stop filter.

Returns:

true if there are stopwords configured and the parsed query was empty false in any other case.

rebuildUserQuery

protected String rebuildUserQuery(List<ExtendedDismaxQParser.Clause> clauses,
                                  boolean lowercaseOperators)

Generates a query string from the raw clauses, uppercasing 'and' and 'or' as needed.

Parameters:

clauses - the clauses of the query string to be rebuilt

lowercaseOperators - if true, lowercase 'and' and 'or' clauses will be recognized as operators and uppercased in the final query string.

Returns:

the generated query string.

getMultiplicativeBoosts

protected List<ValueSource> getMultiplicativeBoosts()
                                             throws SyntaxError

Parses all multiplicative boosts

Throws:

SyntaxError

getBoostFunctions

protected List<Query> getBoostFunctions()
                                 throws SyntaxError

Parses all function queries

Throws:

SyntaxError

getBoostQueries

protected List<Query> getBoostQueries()
                               throws SyntaxError

Parses all boost queries

Throws:

SyntaxError

addShingledPhraseQueries

protected void addShingledPhraseQueries(BooleanQuery mainQuery,
                                        List<ExtendedDismaxQParser.Clause> clauses,
                                        Map<String,Float> fields,
                                        int shingleSize,
                                        float tiebreaker,
                                        int slop)
                                 throws SyntaxError

Modifies the main query by adding a new optional Query consisting of shingled phrase queries across the specified clauses using the specified field => boost mappings.

Parameters:

mainQuery - Where the phrase boosting queries will be added

clauses - Clauses that will be used to construct the phrases

fields - Field => boost mappings for the phrase queries

shingleSize - how big the phrases should be, 0 means a single phrase

tiebreaker - tie breaker value for the DisjunctionMaxQueries

slop - slop value for the constructed phrases

Throws:

SyntaxError

getDefaultHighlightFields

public String[] getDefaultHighlightFields()

Overrides:

getDefaultHighlightFields in class QParser

getHighlightQuery

public Query getHighlightQuery()
                        throws SyntaxError

Overrides:

getHighlightQuery in class QParser

Throws:

SyntaxError

addDebugInfo

public void addDebugInfo(NamedList<Object> debugInfo)

Overrides:

addDebugInfo in class QParser

splitIntoClauses

public List<ExtendedDismaxQParser.Clause> splitIntoClauses(String s,
                                                           boolean ignoreQuote)

getFieldName

public String getFieldName(String s,
                           int pos,
                           int end)

returns a field name or legal field alias from the current position of the string

split

public static List<String> split(String s,
                                 boolean ignoreQuote)