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Java Source Code / Java Documentation » Net » lucene connector » org.apache.lucene.search 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.lucene.search.Query

All known Subclasses:   org.apache.lucene.search.function.CustomScoreQuery,  org.apache.lucene.search.FuzzyLikeThisQuery,  org.apache.lucene.search.MatchAllDocsQuery,  org.apache.lucene.search.ConstantScoreQuery,  org.apache.lucene.search.MultiPhraseQuery,  org.apache.lucene.search.similar.MoreLikeThisQuery,  org.apache.lucene.search.BooleanQuery,  org.apache.lucene.search.DisjunctionMaxQuery,  org.apache.lucene.search.RangeQuery,  org.apache.lucene.search.TermQuery,  org.apache.lucene.search.spans.SpanQuery,  org.apache.lucene.search.FilteredQuery,  org.apache.lucene.search.BoostingQuery,  org.apache.lucene.search.ConstantScoreRangeQuery,  org.apache.lucene.search.MultiTermQuery,  org.apache.lucene.search.PhraseQuery,  org.apache.lucene.search.function.ValueSourceQuery,  org.apache.lucene.search.PrefixQuery,
Query
abstract public class Query implements java.io.Serializable,Cloneable(Code)
The abstract base class for queries.

Instantiable subclasses are:

A parser for queries is contained in:





Method Summary
public  Objectclone()
     Returns a clone of this query.
public  Querycombine(Query[] queries)
     Expert: called when re-writing queries under MultiSearcher. Create a single query suitable for use by all subsearchers (in 1-1 correspondence with queries).
protected  WeightcreateWeight(Searcher searcher)
     Expert: Constructs an appropriate Weight implementation for this query.
public  voidextractTerms(Set terms)
     Expert: adds all terms occuring in this query to the terms set.
public  floatgetBoost()
     Gets the boost for this clause.
public  SimilaritygetSimilarity(Searcher searcher)
     Expert: Returns the Similarity implementation to be used for this query.
public static  QuerymergeBooleanQueries(Query[] queries)
     Expert: merges the clauses of a set of BooleanQuery's into a single BooleanQuery.
public  Queryrewrite(IndexReader reader)
     Expert: called to re-write queries into primitive queries.
public  voidsetBoost(float b)
     Sets the boost for this query clause to b.
abstract public  StringtoString(String field)
     Prints a query to a string, with field assumed to be the default field and omitted.

The representation used is one that is supposed to be readable by org.apache.lucene.queryParser.QueryParser QueryParser .

public  StringtoString()
     Prints a query to a string.
public  Weightweight(Searcher searcher)
     Expert: Constructs and initializes a Weight for a top-level query.



Method Detail
clone
public Object clone()(Code)
Returns a clone of this query.



combine
public Query combine(Query[] queries)(Code)
Expert: called when re-writing queries under MultiSearcher. Create a single query suitable for use by all subsearchers (in 1-1 correspondence with queries). This is an optimization of the OR of all queries. We handle the common optimization cases of equal queries and overlapping clauses of boolean OR queries (as generated by MultiTermQuery.rewrite() and RangeQuery.rewrite()). Be careful overriding this method as queries[0] determines which method will be called and is not necessarily of the same type as the other queries.



createWeight
protected Weight createWeight(Searcher searcher) throws IOException(Code)
Expert: Constructs an appropriate Weight implementation for this query.

Only implemented by primitive queries, which re-write to themselves.




extractTerms
public void extractTerms(Set terms)(Code)
Expert: adds all terms occuring in this query to the terms set. Only works if this query is in its Query.rewrite rewritten form.
throws:
  UnsupportedOperationException - if this query is not yet rewritten



getBoost
public float getBoost()(Code)
Gets the boost for this clause. Documents matching this clause will (in addition to the normal weightings) have their score multiplied by b. The boost is 1.0 by default.



getSimilarity
public Similarity getSimilarity(Searcher searcher)(Code)
Expert: Returns the Similarity implementation to be used for this query. Subclasses may override this method to specify their own Similarity implementation, perhaps one that delegates through that of the Searcher. By default the Searcher's Similarity implementation is returned.



mergeBooleanQueries
public static Query mergeBooleanQueries(Query[] queries)(Code)
Expert: merges the clauses of a set of BooleanQuery's into a single BooleanQuery.

A utility for use by Query.combine(Query[]) implementations.




rewrite
public Query rewrite(IndexReader reader) throws IOException(Code)
Expert: called to re-write queries into primitive queries. For example, a PrefixQuery will be rewritten into a BooleanQuery that consists of TermQuerys.



setBoost
public void setBoost(float b)(Code)
Sets the boost for this query clause to b. Documents matching this clause will (in addition to the normal weightings) have their score multiplied by b.



toString
abstract public String toString(String field)(Code)
Prints a query to a string, with field assumed to be the default field and omitted.

The representation used is one that is supposed to be readable by org.apache.lucene.queryParser.QueryParser QueryParser . However, there are the following limitations:

  • If the query was created by the parser, the printed representation may not be exactly what was parsed. For example, characters that need to be escaped will be represented without the required backslash.
  • Some of the more complicated queries (e.g. span queries) don't have a representation that can be parsed by QueryParser.



toString
public String toString()(Code)
Prints a query to a string.



weight
public Weight weight(Searcher searcher) throws IOException(Code)
Expert: Constructs and initializes a Weight for a top-level query.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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