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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019-2021, 2023 Nordix Foundation.
* Modifications Copyright (C) 2019, 2021 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.policy.models.base;
import jakarta.ws.rs.core.Response;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.function.Function;
import java.util.stream.Collectors;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.MapUtils;
/**
* Utility class for Policy Framework concept utilities.
*
* @author Liam Fallon (liam.fallon@est.tech)
*/
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class PfUtils {
/**
* Compare two objects using their equals methods, nulls are allowed.
*
* @param leftObject the first object
* @param rightObject the second object
* @return a measure of the comparison
*/
public static int compareObjects(final Object leftObject, final Object rightObject) {
if (leftObject == null && rightObject == null) {
return 0;
}
if (leftObject == null) {
return 1;
}
if (rightObject == null) {
return -1;
}
if (!leftObject.equals(rightObject)) {
return leftObject.hashCode() - rightObject.hashCode();
}
return 0;
}
/**
* Compare two collections of the same type, nulls are allowed.
*
* @param leftCollection the first collection
* @param rightCollection the second collection
* @return a measure of the comparison
*/
public static <T> int compareCollections(final Collection<T> leftCollection, final Collection<T> rightCollection) {
if (CollectionUtils.isEmpty(leftCollection) && CollectionUtils.isEmpty(rightCollection)) {
return 0;
}
return compareObjects(leftCollection, rightCollection);
}
/**
* Compare two maps of the same type, nulls are allowed.
*
* @param leftMap the first map
* @param rightMap the second map
* @return a measure of the comparison
*/
public static <K, V> int compareMaps(final Map<K, V> leftMap, final Map<K, V> rightMap) {
if (MapUtils.isEmpty(leftMap) && MapUtils.isEmpty(rightMap)) {
return 0;
}
return compareObjects(leftMap, rightMap);
}
/**
* Convenience method to apply a mapping function to all the elements of a list, generating a new list.
*
* @param source list whose elements are to be mapped, or {@code null}
* @param mapFunc mapping function
* @param defaultValue value to be returned if source is {@code null}
* @return a new list, containing mappings of all the items in the original list
*/
public static <T, R> List<R> mapList(List<T> source, Function<T, R> mapFunc, List<R> defaultValue) {
if (source == null) {
return defaultValue;
}
return source.stream().map(mapFunc).collect(Collectors.toList());
}
/**
* Convenience method to apply a mapping function to all the elements of a list, generating a new list.
*
* @param source list whose elements are to be mapped, or {@code null}
* @param mapFunc mapping function
* @return a new list, containing mappings of all the items in the original list, or {@code null} if the source
* is {@code null}
*/
public static <T, R> List<R> mapList(List<T> source, Function<T, R> mapFunc) {
return mapList(source, mapFunc, null);
}
/**
* Convenience method to apply a mapping function to all the values of a map, generating a new map.
*
* @param source map whose values are to be mapped, or {@code null}
* @param mapFunc mapping function
* @param defaultValue value to be returned if source is {@code null}
* @return a new map, containing mappings of all the items in the original map
*/
public static <K, T, R> Map<K, R> mapMap(Map<K, T> source, Function<T, R> mapFunc, Map<K, R> defaultValue) {
if (source == null) {
return defaultValue;
}
Map<K, R> map = new LinkedHashMap<>();
for (Entry<K, T> ent : source.entrySet()) {
map.put(ent.getKey(), mapFunc.apply(ent.getValue()));
}
return map;
}
/**
* Convenience method to apply a mapping function to all the values of a map, generating a new map.
*
* @param source map whose values are to be mapped, or {@code null}
* @param mapFunc mapping function
* @return a new map, containing mappings of all the items in the original map, or {@code null} if the source is
* {@code null}
*/
public static <K, T, R> Map<K, R> mapMap(Map<K, T> source, Function<T, R> mapFunc) {
return mapMap(source, mapFunc, null);
}
/**
* Makes a copy of an object using the copy constructor from the object's class.
*
* @param source object to be copied
* @return a copy of the source, or {@code null} if the source is {@code null}
* @throws PfModelRuntimeException if the object cannot be copied
*/
public static <T> T makeCopy(T source) {
if (source == null) {
return null;
}
try {
@SuppressWarnings("unchecked") Class<? extends T> clazz = (Class<? extends T>) source.getClass();
return clazz.getConstructor(clazz).newInstance(source);
} catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException
| RuntimeException e) {
throw new PfModelRuntimeException(Response.Status.INTERNAL_SERVER_ERROR,
"error copying concept key class: " + source.getClass().getName(), e);
}
}
}
|
