IsNullFilterBuilder.java

/*
 * Copyright (c)  [2011-2016] "Pivotal Software, Inc." / "Neo Technology" / "Graph Aware Ltd."
 *
 * This product is licensed to you under the Apache License, Version 2.0 (the "License").
 * You may not use this product except in compliance with the License.
 *
 * This product may include a number of subcomponents with
 * separate copyright notices and license terms. Your use of the source
 * code for these subcomponents is subject to the terms and
 * conditions of the subcomponent's license, as noted in the LICENSE file.
 *
 */


package org.springframework.data.neo4j.repository.query.derived.builder;

import static org.springframework.data.repository.query.parser.Part.Type.*;

import java.util.Collections;
import java.util.List;
import java.util.Stack;

import org.neo4j.ogm.cypher.BooleanOperator;
import org.neo4j.ogm.cypher.ComparisonOperator;
import org.neo4j.ogm.cypher.Filter;
import org.springframework.data.repository.query.parser.Part;

/**
 * @author Jasper Blues
 * @author Nicolas Mervaillie
 */
public class IsNullFilterBuilder extends FilterBuilder {

    public IsNullFilterBuilder(Part part, BooleanOperator booleanOperator, Class<?> entityType) {
        super(part, booleanOperator, entityType);
    }

    @Override
    public List<Filter> build(Stack<Object> params) {
        Filter filter = new Filter(propertyName(), ComparisonOperator.IS_NULL);
        filter.setOwnerEntityType(entityType);
        filter.setBooleanOperator(booleanOperator);
        filter.setNegated(isNegated() || part.getType() == IS_NOT_NULL);
        setNestedAttributes(part, filter);

        return Collections.singletonList(filter);
    }

}