001/*
002 *  Copyright (c) 2023-2026, Agents-Flex (fuhai999@gmail.com).
003 *  <p>
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *  <p>
008 *  http://www.apache.org/licenses/LICENSE-2.0
009 *  <p>
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package com.agentsflex.core.util;
017
018public class StringUtil {
019
020    public static boolean noText(String string) {
021        return !hasText(string);
022    }
023
024    public static boolean hasText(String string) {
025        return string != null && !string.isEmpty() && containsText(string);
026    }
027
028    public static boolean hasText(String... strings) {
029        for (String string : strings) {
030            if (!hasText(string)) {
031                return false;
032            }
033        }
034        return true;
035    }
036
037    private static boolean containsText(CharSequence str) {
038        for (int i = 0; i < str.length(); i++) {
039            if (!Character.isWhitespace(str.charAt(i))) {
040                return true;
041            }
042        }
043        return false;
044    }
045
046    public static String getFirstWithText(String... strings) {
047        if (strings == null) {
048            return null;
049        }
050        for (String str : strings) {
051            if (hasText(str)) {
052                return str;
053            }
054        }
055        return null;
056    }
057
058    public static boolean isJsonObject(String jsonString) {
059        if (noText(jsonString)) {
060            return false;
061        }
062
063        jsonString = jsonString.trim();
064        return jsonString.startsWith("{") && jsonString.endsWith("}");
065    }
066
067    public static boolean notJsonObject(String jsonString) {
068        return !isJsonObject(jsonString);
069    }
070
071
072    public static boolean isNumeric(String str) {
073        if (str == null || str.isEmpty()) return false;
074        int len = str.length(), i = 0;
075        if (str.charAt(0) == '+' || str.charAt(0) == '-') {
076            if (len == 1) return false;
077            i = 1;
078        }
079        for (; i < len; i++) {
080            char c = str.charAt(i);
081            if (c < '0' || c > '9') return false;
082        }
083        return true;
084    }
085}