/*
 * Copyright (c) 2010-2016 Evolveum
 *
 * 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 com.evolveum.midpoint.prism.schema;

import com.evolveum.midpoint.prism.Definition;
import com.evolveum.midpoint.prism.ItemDefinition;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author mederly
 */
public class DefinitionStoreUtils {
	public static <D extends Definition> D getOne(List<D> list) {
		if (list.isEmpty()) {
			return null;
		} else if (list.size() == 1) {
			return list.get(0);
		} else {
			// consider not deprecated ones
			List<D> notDeprecated = list.stream()
					.filter(def -> !def.isDeprecated())
					.collect(Collectors.toList());
			if (notDeprecated.size() == 1) {
				return notDeprecated.get(0);
			} else {
				throw new IllegalStateException("More than one definition found: " + list);
			}
		}
	}

	public static <ID extends ItemDefinition> ID getOne(List<ID> list, boolean exceptionIfAmbiguous, String message) {
		if (list.isEmpty()) {
			return null;
		} else if (list.size() == 1) {
			return list.get(0);
		} else {
			// consider not deprecated ones
			List<ID> notDeprecated = list.stream()
					.filter(def -> !def.isDeprecated())
					.collect(Collectors.toList());
			if (notDeprecated.size() == 1) {
				return notDeprecated.get(0);
			} else {
				if (exceptionIfAmbiguous) {
					throw new IllegalArgumentException(message + ": " +
							list.stream().map(ItemDefinition::getName).collect(Collectors.toList()));
				} else {
					return null;
				}
			}
		}
	}
}