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Protocol engine is a lightweight protocol parase framwork and resuable components

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.github.io.protocol.utils;

public class PrettyUtil {
    private PrettyUtil() {

    }

    public static String format(String jsonStr) {
        int level = 0;
        StringBuffer jsonForMatStr = new StringBuffer();
        for (int i = 0; i < jsonStr.length(); i++) {
            char c = jsonStr.charAt(i);
            if (level > 0 && '\n' == jsonForMatStr.charAt(jsonForMatStr.length() - 1)) {
                jsonForMatStr.append(getLevelStr(level));
            }
            switch (c) {
                case '{':
                case '[':
                    jsonForMatStr.append(c + "\n");
                    level++;
                    break;
                case ',':
                    jsonForMatStr.append(c + "\n");
                    break;
                case '}':
                case ']':
                    jsonForMatStr.append("\n");
                    level--;
                    jsonForMatStr.append(getLevelStr(level));
                    jsonForMatStr.append(c);
                    break;
                default:
                    jsonForMatStr.append(c);
                    break;
            }
        }

        return jsonForMatStr.toString();
    }

    private static String getLevelStr(int level) {
        StringBuffer levelStr = new StringBuffer();
        for (int levelI = 0; levelI < level; levelI++) {
            levelStr.append("\t");
        }
        return levelStr.toString();
    }
}