org.axe.util.CollectionUtil.java Source code

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Here is the source code for org.axe.util.CollectionUtil.java

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/**
 * MIT License
 * 
 * Copyright (c) 2017 CaiDongyu
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.axe.util;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.MapUtils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * ?
 * @author CaiDongyu on 2016/4/9.
 */
public final class CollectionUtil {

    private CollectionUtil() {
    }

    /**
     *  Collection ?
     */
    public static boolean isEmpty(Collection<?> collection) {
        return CollectionUtils.isEmpty(collection);
    }

    /**
     *  Collection ??
     */
    public static boolean isNotEmpty(Collection<?> collection) {
        return !isEmpty(collection);
    }

    /**
     *  Map ?
     */
    public static boolean isEmpty(Map<?, ?> map) {
        return MapUtils.isEmpty(map);
    }

    /**
     *  Map ??
     */
    public static boolean isNotEmpty(Map<?, ?> map) {
        return !isEmpty(map);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static <T> List<T> intersect(List ls, List ls2) {
        List<T> list = new ArrayList(Arrays.asList(new Object[ls.size()]));
        Collections.copy(list, ls);
        list.retainAll(ls2);
        return list;
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static <T> List<T> union(List ls, List ls2) {
        List list = new ArrayList(Arrays.asList(new Object[ls.size()]));
        Collections.copy(list, ls);
        list.addAll(ls2);
        return list;
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static <T> List<T> diff(List ls, List ls2) {
        List list = new ArrayList(Arrays.asList(new Object[ls.size()]));
        Collections.copy(list, ls);
        list.removeAll(ls2);
        return list;
    }
}