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/*
 * Tencent is pleased to support the open source community by making Polaris available.
 *
 * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * 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.tencent.polaris.metadata.core;

public class Utils {

    /**
     * 默认不区分大小写
     */
    public static final boolean DEFAULT_KEY_CASE_SENSITIVE = false;

    public static String encapsulateMetadataKey(String prefix, String key) {
        if (null == prefix || prefix.isEmpty()) {
            return key;
        }
        if (startsWith(key, prefix, true)) {
            return key;
        }
        return prefix + key;
    }

    /**
     * Check if a String starts with a specified prefix (optionally case insensitive).
     *
     * @see java.lang.String#startsWith(String)
     * @param str  the String to check, may be null
     * @param prefix the prefix to find, may be null
     * @param ignoreCase inidicates whether the compare should ignore case
     *  (case insensitive) or not.
     * @return true if the String starts with the prefix or
     *  both null
     */
    private static boolean startsWith(String str, String prefix, boolean ignoreCase) {
        if (str == null || prefix == null) {
            return (str == null && prefix == null);
        }
        if (prefix.length() > str.length()) {
            return false;
        }
        return str.regionMatches(ignoreCase, 0, prefix, 0, prefix.length());
    }

    public static String normalize(String key) {
        if (null == key) {
            return key;
        }
        return key.toLowerCase();
    }
}