001    /*
002     * Cumulus4j - Securing your data in the cloud - http://cumulus4j.org
003     * Copyright (C) 2011 NightLabs Consulting GmbH
004     *
005     * This program is free software: you can redistribute it and/or modify
006     * it under the terms of the GNU Affero General Public License as
007     * published by the Free Software Foundation, either version 3 of the
008     * License, or (at your option) any later version.
009     *
010     * This program is distributed in the hope that it will be useful,
011     * but WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013     * GNU Affero General Public License for more details.
014     *
015     * You should have received a copy of the GNU Affero General Public License
016     * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017     */
018    package org.cumulus4j.store.query.eval;
019    
020    import java.util.Set;
021    
022    import org.cumulus4j.store.query.QueryEvaluator;
023    import org.datanucleus.query.expression.SubqueryExpression;
024    
025    /**
026     * Evaluator handling a <a target="_blank" href="http://www.datanucleus.org/products/accessplatform_3_0/jdo/jdoql_subquery.html">sub-query</a>.
027     * @author Andy Jefferson
028     * @author Marco หงุ่ยตระกูล-Schulze - marco at nightlabs dot de (only added javadoc)
029     */
030    public class SubqueryExpressionEvaluator
031    extends AbstractExpressionEvaluator<SubqueryExpression>
032    {
033            /**
034             * Create an instance.
035             * @param queryEvaluator the evaluator responsible for the evaluation of the whole query.
036             * @param parent the parent in the tree structure or <code>null</code>, if this is the root.
037             * @param expression the expression to evaluate.
038             */
039            public SubqueryExpressionEvaluator(QueryEvaluator queryEvaluator, AbstractExpressionEvaluator<?> parent, SubqueryExpression expression)
040            {
041                    super(queryEvaluator, parent, expression);
042            }
043    
044            @Override
045            protected Set<Long> _queryResultDataEntryIDs(ResultDescriptor resultDescriptor)
046            throws UnsupportedOperationException
047            {
048                    throw new UnsupportedOperationException("NYI");
049            }
050    
051    }