org.apache.lucene.search

Class GraphQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.GraphQuery

public final class GraphQuery
extends Query

A query that wraps multiple sub-queries generated from a graph token stream.

Constructor Summary

Constructors

Constructor and Description
GraphQuery(Query... queries) Constructor sets the queries and checks if any of them are a boolean query.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object other) Override and implement query instance equivalence properly in a subclass.
List<Query>	getQueries() Gets the queries
boolean	hasBoolean() If there is at least one boolean query or not.
int	hashCode() Override and implement query hash code properly in a subclass.
boolean	hasPhrase() If there is at least one phrase query or not.
Query	rewrite(IndexReader reader) Rewrites to a single query or a boolean query where each query is a SHOULD clause.
String	toString(String field) Prints a query to a string, with field assumed to be the default field and omitted.

Methods inherited from class org.apache.lucene.search.Query

classHash, createWeight, sameClassAs, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

GraphQuery

public GraphQuery(Query... queries)

Constructor sets the queries and checks if any of them are a boolean query.

Parameters:

queries - the non-null array of queries

Method Detail

getQueries

public List<Query> getQueries()

Gets the queries

Returns:

unmodifiable list of Query

hasBoolean

public boolean hasBoolean()

If there is at least one boolean query or not.

Returns:

true if there is a boolean, false if not

hasPhrase

public boolean hasPhrase()

If there is at least one phrase query or not.

Returns:

true if there is a phrase query, false if not

rewrite

public Query rewrite(IndexReader reader)
              throws IOException

Rewrites to a single query or a boolean query where each query is a SHOULD clause.

Overrides:

rewrite in class Query

Throws:

IOException

toString

public String toString(String field)

Description copied from class: Query

Prints a query to a string, with field assumed to be the default field and omitted.

Specified by:

toString in class Query

equals

public boolean equals(Object other)

Description copied from class: Query

Override and implement query instance equivalence properly in a subclass. This is required so that QueryCache works properly. Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.

Specified by:

equals in class Query

See Also:

Query.sameClassAs(Object), Query.classHash()

hashCode

public int hashCode()

Description copied from class: Query

Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.

Specified by:

hashCode in class Query

See Also:

Query.equals(Object)