/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate licenses this file
* to you 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.operation.scalar.conditional;
import io.crate.metadata.FunctionInfo;
import io.crate.data.Input;
import io.crate.operation.scalar.ScalarFunctionModule;
public class CoalesceFunction extends ConditionalFunction {
public final static String NAME = "coalesce";
private CoalesceFunction(FunctionInfo info) {
super(info);
}
@Override
public Object evaluate(Input... args) {
for (Input input : args) {
Object value = input.value();
if (value != null) {
return value;
}
}
return null;
}
public static void register(ScalarFunctionModule module) {
module.register(NAME, new ConditionalFunctionResolver(NAME, CoalesceFunction::new));
}
}