ParentsUtil.java

/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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.hawkular.inventory.base;

import java.util.Collections;
import java.util.EnumSet;

import org.hawkular.inventory.api.Parents;

/**
 * @author Lukas Krejci
 * @since 0.9.0
 */
class ParentsUtil {

    private ParentsUtil() {

    }

    public static <T extends Enum<T> & Parents> EnumSet<T> convert(Class<T> type, T current, T[] parents) {
        if (parents == null) {
            return EnumSet.allOf(type);
        } else if (parents.length == 0) {
            return EnumSet.of(current);
        } else {
            EnumSet<T> ret = EnumSet.noneOf(type);
            Collections.addAll(ret, parents);
            return ret;
        }
    }
}