001/*
002 * #%L
003 * GwtMaterial
004 * %%
005 * Copyright (C) 2015 - 2017 GwtMaterialDesign
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 * 
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 * 
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package gwt.material.design.client.data;
021
022import java.util.Comparator;
023
024public enum SortDir {
025    /**
026     * Ascending.
027     */
028    ASC {
029        @Override
030        public <X> Comparator<X> comparator(final Comparator<X> c) {
031            return c::compare;
032        }
033    },
034
035    /**
036     * Descending.
037     */
038    DESC {
039        @Override
040        public <X> Comparator<X> comparator(final Comparator<X> c) {
041            return (X o1, X o2) -> c.compare(o2, o1);
042        }
043    };
044
045    public SortDir reverse() {
046        return this.equals(ASC) ? DESC : ASC;
047    }
048
049    public abstract <X> Comparator<X> comparator(Comparator<X> c);
050}