/*
* Copyright 2015 Eediom Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.araqne.logdb.query.expr;
import java.util.List;
import org.araqne.logdb.QueryContext;
import org.araqne.logdb.Row;
/**
* @since 2.4.58
*/
public class Nvl extends FunctionExpression {
private Expression condExpr;
private Expression valExpr;
public Nvl(QueryContext ctx, List<Expression> exprs) {
super("nvl", exprs, 2);
this.condExpr = exprs.get(0);
this.valExpr = exprs.get(1);
}
@Override
public Object eval(Row row) {
Object o = condExpr.eval(row);
if (o != null)
return o;
return valExpr.eval(row);
}
}