[Task] refactor nest block to improve readability by guard

[Thespica]

Description

There are some code with deep nest block, which are hard to read and understand. We can refactor nest block to improve readability by guard

For example, in CollectUtil.java:

            JsonObject jsonObject = jsonElement.getAsJsonObject();
            Iterator<Map.Entry<String, JsonElement>> iterator = jsonObject.entrySet().iterator();
            while (iterator.hasNext()) {
                Map.Entry<String, JsonElement> entry = iterator.next();
                JsonElement element = entry.getValue();
                // Replace normal VALUE value
                if (element.isJsonPrimitive()) {
                    // Check if there are special characters Replace
                    String value = element.getAsString();
                    Matcher cryingMatcher = CRYING_PLACEHOLDER_REGEX_PATTERN.matcher(value);
                    if (cryingMatcher.find()) {
                        cryingMatcher.reset();
                        while (cryingMatcher.find()) {
                            String group = cryingMatcher.group();
                            String replaceField = group.replaceAll(CRYING_PLACEHOLDER_REX, "");
                            Configmap param = configmap.get(replaceField);
                            if (param != null) {
                                if (param.getValue() == null) {
                                    if (group.length() == value.length()) {
                                        value = null;
                                        break;
                                    } else {
                                        value = value.replace(group, "");
                                    }
                                } else {
                                    value = value.replace(group, (String) param.getValue());
                                }
                            }
                        }
                        jsonObject.addProperty(entry.getKey(), value);
                    }
                } else {
                    jsonObject.add(entry.getKey(), replaceCryPlaceholder(entry.getValue(), configmap));
                }
            }

can be replaced by:

            JsonObject jsonObject = jsonElement.getAsJsonObject();
            Iterator<Map.Entry<String, JsonElement>> iterator = jsonObject.entrySet().iterator();
            while (iterator.hasNext()) {
                Map.Entry<String, JsonElement> entry = iterator.next();
                JsonElement element = entry.getValue();
                if (!element.isJsonPrimitive()) {
                    jsonObject.add(entry.getKey(), replaceCryPlaceholder(entry.getValue(), configmap));
                    continue;
                }
                // Replace normal VALUE value                
                // Check if there are special characters Replace
                String value = element.getAsString();
                Matcher cryingMatcher = CRYING_PLACEHOLDER_REGEX_PATTERN.matcher(value);
                if (!cryingMatcher.find()) {
                    continue;
                }
                cryingMatcher.reset();
                while (cryingMatcher.find()) {
                    String group = cryingMatcher.group();
                    String replaceField = group.replaceAll(CRYING_PLACEHOLDER_REX, "");
                    Configmap param = configmap.get(replaceField);
                    if (param == null) {
                        continue;
                    }
                    if (param.getValue() == null) {
                        if (group.length() == value.length()) {
                            value = null;
                            break;
                        } else {
                            value = value.replace(group, "");
                        }
                    } else {
                        value = value.replace(group, (String) param.getValue());
                    }
                }
                jsonObject.addProperty(entry.getKey(), value);

Task List

• [ ] collector/src/main/java/org/apache/hertzbeat/collector/util/CollectUtil.java