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/*
* ============LICENSE_START=======================================================
* Copyright (c) 2021 Bell Canada.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.temporal.controller.rest.model;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import javax.validation.ValidationException;
import javax.validation.constraints.NotEmpty;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.data.domain.Sort.Order;
import org.springframework.stereotype.Component;
@Component
public class SortMapper {
private static final String SORT_ORDER_SEPARATOR = ",";
private static final String FIELD_DIRECTION_SEPARATOR = ":";
/**
* convert from Sort to String format "fieldname:direction,...,fieldname:direction".
*
* @param sort sort
* @return sort string
*/
public String sortAsString(final Sort sort) {
return sort.stream()
.map(sortOrder ->
sortOrder.getProperty() + FIELD_DIRECTION_SEPARATOR
+ sortOrder.getDirection().toString().toLowerCase(Locale.ENGLISH))
.collect(Collectors.joining(SORT_ORDER_SEPARATOR));
}
/**
* Convert from "fieldname:direction,...,fieldname:direction" format to Sort. Example :
* "anchor:asc,observed_timestamp:desc"
*
* @param sortString sortString
* @return Sort
*/
public Sort toSort(@NotEmpty final String sortString) {
try {
final String[] sortingOrderAsString = sortString.split(SORT_ORDER_SEPARATOR);
final List<Order> sortOrder = new ArrayList<>();
for (final String eachSortAsString : sortingOrderAsString) {
final String[] eachSortDetail = eachSortAsString.split(FIELD_DIRECTION_SEPARATOR);
final var direction = Direction.fromString(eachSortDetail[1]);
final String fieldName = eachSortDetail[0];
sortOrder.add(new Order(direction, fieldName));
}
return Sort.by(sortOrder);
} catch (final Exception exception) {
throw new ValidationException(
String.format(
"Invalid sort format. sort '%s' is not in '<fieldname>:<direction>,...,<fieldname>:<direction>'"
+ " format. Example: 'anchor:asc,observed_timestamp:desc'", sortString), exception
);
}
}
}
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