/*
* Copyright 2017 the original author or authors.
*
* 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.springframework.data.mongodb.core.aggregation;
import java.util.ArrayList;
import java.util.List;
import org.springframework.data.domain.Range;
import org.springframework.util.Assert;
/**
* Utility methods for aggregation operation implementations.
*
* @author Oliver Gierke
*/
interface AggregationUtils {
/**
* Converts the given {@link Range} into an array of values.
*
* @param range must not be {@literal null}.
* @return
*/
public static List<Long> toRangeValues(Range<Long> range) {
Assert.notNull(range, "Range must not be null!");
List<Long> result = new ArrayList<Long>(2);
result.add(range.getLowerBound().getValue()
.orElseThrow(() -> new IllegalArgumentException("Lower bound of range must be bounded!")));
range.getUpperBound().getValue().ifPresent(it -> result.add(it));
return result;
}
}