LessThanPredicateImpl.java

/*
   Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

package com.mysql.clusterj.core.query;

import com.mysql.clusterj.core.spi.QueryExecutionContext;
import com.mysql.clusterj.core.store.IndexScanOperation;
import com.mysql.clusterj.core.store.ScanFilter;
import com.mysql.clusterj.core.store.ScanOperation;

public class LessThanPredicateImpl extends ComparativePredicateImpl {

    public LessThanPredicateImpl(QueryDomainTypeImpl<?> dobj,
            PropertyImpl property, ParameterImpl param) {
        super(dobj, property, param);
    }

    @Override
    public void markBoundsForCandidateIndices(QueryExecutionContext context, CandidateIndexImpl[] candidateIndices) {
        if (param.getParameterValue(context) == null) {
            // null parameters cannot be used with indexes
            return;
        }
        property.markUpperBound(candidateIndices, this, true);
    }

    @Override
    public void operationSetBounds(QueryExecutionContext context, IndexScanOperation op, boolean lastColumn) {
        if (lastColumn) {
            // last column may be strict
            property.operationSetBounds(param.getParameterValue(context), IndexScanOperation.BoundType.BoundGT, op);
        } else {
            // not-last column must not be strict
            property.operationSetBounds(param.getParameterValue(context), IndexScanOperation.BoundType.BoundGE, op);
        }
    }

    @Override
    public void filterCmpValue(QueryExecutionContext context, ScanOperation op, ScanFilter filter) {
        property.filterCmpValue(param.getParameterValue(context), ScanFilter.BinaryCondition.COND_LT, filter);
    }

}