/*
* Copyright 1999-2015 dangdang.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.dangdang.ddframe.job.util.config;
import com.google.common.base.Joiner;
import com.google.common.base.Strings;
import lombok.Getter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* 分片项工具类.
*
* @author zhangliang
*/
@Getter
public final class ShardingItems {
private static final String DELIMITER = ",";
/**
* 根据分片项字符串获取分片项列表.
*
* @param itemsString 分片项字符串
* @return 分片项列表
*/
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;
}
/**
* 根据分片项列表获取分片项字符串.
*
* @param items 分片项列表
* @return 分片项字符串
*/
public static String toItemsString(final List<Integer> items) {
return items.isEmpty() ? "" : Joiner.on(DELIMITER).join(items);
}
}