/*
* 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 java.util.Comparator;
abstract class ConditionalCompareFunction extends ConditionalFunction implements Comparator {
ConditionalCompareFunction(FunctionInfo info) {
super(info);
}
@Override
public Object evaluate(Input... args) {
assert args != null : "args must not be null";
assert args.length > 0 : "number of args must be > 1";
if (args.length == 1) {
return args[0].value();
}
Object result = null;
for (Input input : args) {
result = extrema(result, input.value());
}
return result;
}
private Object extrema(Object value1, Object value2) {
if (value1 == null) {
return value2;
} else if (value2 == null) {
return value1;
}
return compare(value1, value2) < 0 ? value1 : value2;
}
}