no.sesat.search.query.parser
Class AndClauseImpl

java.lang.Object
  no.sesat.search.query.parser.AbstractClause
      no.sesat.search.query.parser.AbstractUnaryClause
          no.sesat.search.query.parser.AbstractBinaryClause
              no.sesat.search.query.parser.AndClauseImpl

All Implemented Interfaces:

Serializable, no.sesat.commons.visitor.Visitable, AndClause, BinaryClause, Clause, UnaryClause

public final class AndClauseImpl
extends AbstractBinaryClause
implements AndClause

The AndClauseImpl represents a joining clause between two terms in the query. For example: "term1 AND term2". Objects of this class are immutable

Version:

$Id: AndClauseImpl.java 7225 2009-04-09 00:32:20Z ssmiweve $

See Also:

Serialized Form

Field Summary

Fields inherited from class no.sesat.search.query.parser.AbstractUnaryClause

firstClause

Fields inherited from class no.sesat.search.query.parser.AbstractClause

DFAULT_REFERENCE_MAP_TYPE, ERR_FAILED_FINDING_OR_USING_CONSTRUCTOR, ERR_MUST_ALWAYS_USE_ARGED_CONSTRUCTOR

Constructor Summary

protected

AndClauseImpl(String term, Clause first, Clause second, Set<TokenPredicate> knownPredicates, Set<TokenPredicate> possiblePredicates) Create clause with the given term, field, known and possible predicates.

Method Summary

static AndClauseImpl

createAndClause(Clause first, Clause second, TokenEvaluationEngine engine) Creator method for AndClauseImpl objects.

Methods inherited from class no.sesat.search.query.parser.AbstractBinaryClause

getSecondClause, toString

Methods inherited from class no.sesat.search.query.parser.AbstractUnaryClause

createClause, getFirstClause

Methods inherited from class no.sesat.search.query.parser.AbstractClause

accept, addClauseInUse, findClauseInUse, findPredicates, getKnownPredicates, getPossiblePredicates, getTerm, hashCode

Methods inherited from class java.lang.Object

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

Methods inherited from interface no.sesat.search.query.BinaryClause

getSecondClause

Methods inherited from interface no.sesat.search.query.UnaryClause

getFirstClause

Methods inherited from interface no.sesat.search.query.Clause

getKnownPredicates, getPossiblePredicates, getTerm

Methods inherited from interface no.sesat.commons.visitor.Visitable

accept

Constructor Detail

AndClauseImpl

protected AndClauseImpl(String term,
                        Clause first,
                        Clause second,
                        Set<TokenPredicate> knownPredicates,
                        Set<TokenPredicate> possiblePredicates)

Create clause with the given term, field, known and possible predicates.

Parameters:

term - the term (query string) for this clause.

first - the left child clause

second - the right child clause

knownPredicates - the set of known predicates for this clause.

possiblePredicates - the set of possible predicates for this clause.

Method Detail

createAndClause

public static AndClauseImpl createAndClause(Clause first,
                                            Clause second,
                                            TokenEvaluationEngine engine)

Creator method for AndClauseImpl objects. By avoiding the constructors, and assuming all AndClauseImpl objects are immutable, we can keep track (via a weak reference map) of instances already in use in this JVM and reuse them. The methods also allow a chunk of creation logic for the AndClauseImpl to be moved out of the QueryParserImpl.jj file to here.

Parameters:

first - the left child clause of the operation clause we are about to create (or find).

second - the right child clause of the operation clause we are about to create (or find).

engine - the factory handing out evaluators against TokenPredicates. Also holds state information about the current term/clause we are finding predicates against.

Returns:

returns a AndAndClauseImplstance matching the term, left and right child clauses. May be either newly created or reused.