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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.
 */

package com.alibaba.nacos.common.utils;

/**
 * namespace(tenant) util. Because config and naming treat namespace(tenant) differently, this tool class can only be
 * used by the config module.
 *
 * @author klw(213539 @ qq.com)
 * @date 2020/10/12 17:56
 */
public class NamespaceUtil {

    private NamespaceUtil() {
    }
    
    private static final String NAMESPACE_PUBLIC_KEY = "public";
    
    /**
     * public id，默认值为 "".
     */
    public static String namespaceDefaultId = "";
    
    private static final String NAMESPACE_NULL_KEY = "null";
    
    /**
     * Treat the namespace(tenant) parameters with values of "public" and "null" as an empty string.
     *
     * @param tenant namespace(tenant) id
     * @return java.lang.String A namespace(tenant) string processed
     */
    public static String processNamespaceParameter(String tenant) {
        if (StringUtils.isBlank(tenant) || NAMESPACE_PUBLIC_KEY.equalsIgnoreCase(tenant)
                || NAMESPACE_NULL_KEY.equalsIgnoreCase(tenant)) {
            return getNamespaceDefaultId();
        }
        return tenant.trim();
    }
    
    /**
     * Set default namespace id. Invoke settings at system startup.
     *
     * @param namespaceDefaultId 参数不能为 null
     */
    public static void setNamespaceDefaultId(String namespaceDefaultId) {
        NamespaceUtil.namespaceDefaultId = namespaceDefaultId;
    }
    
    /**
     * Get default namespace id.
     *
     * @return namespace id
     */
    public static String getNamespaceDefaultId() {
        return NamespaceUtil.namespaceDefaultId;
    }
}