com.vip.saturn.job.utils.ItemUtils.java Source code

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Here is the source code for com.vip.saturn.job.utils.ItemUtils.java

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/**
 * Copyright 2016 vip.com.
 * <p>
 * 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.
 * </p>
 */

package com.vip.saturn.job.utils;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.google.common.base.Joiner;
import com.google.common.base.Strings;

/**
 * .
 * 
 * 
 */
public final class ItemUtils {

    private static final String DELIMITER = ",";

    /**
     * ??.
     * 
     * @param itemsString 
     * @return 
     */
    public static List<Integer> toItemList(final String itemsString) {
        if (Strings.isNullOrEmpty(itemsString)) {
            return Collections.emptyList();
        }
        String[] items = itemsString.split(DELIMITER);
        List<Integer> result = new ArrayList<>(items.length);
        for (String each : items) {
            int item = Integer.parseInt(each);
            if (!result.contains(item)) {
                result.add(item);
            }
        }
        return result;
    }

    /**
     * ??.
     * 
     * @param items 
     * @return 
     */
    public static String toItemsString(final List<Integer> items) {
        return items.isEmpty() ? "" : Joiner.on(ItemUtils.DELIMITER).join(items);
    }
}