/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate licenses this file
* to you 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.core.collections;
import java.util.EnumSet;
import java.util.Set;
public class EnumSets {
/**
* Pack an {@link EnumSet} into one integer
*/
public static <E extends Enum<E>> int packToInt(Set<E> set) {
assert set.size() < 32 : "EnumSet must be smaller than 32";
int i = 0;
for (E element : set) {
i |= (1 << element.ordinal());
}
return i;
}
/**
* Unpack an {@link EnumSet} from a given integer and element type.
*/
public static <E extends Enum<E>> EnumSet<E> unpackFromInt(int i, Class<E> enumType) {
EnumSet<E> result = EnumSet.noneOf(enumType);
for (E element : enumType.getEnumConstants()) {
if ((i & (1 << element.ordinal())) != 0) {
result.add(element);
}
}
return result;
}
}