gudusoft.gsqlparser.util.json

Class JSONUtil

Object

gudusoft.gsqlparser.util.json.JSONUtil

public class JSONUtil
extends Object

Constructor Summary

Constructors

Constructor and Description
JSONUtil()

Method Summary

Modifier and Type	Method and Description
static String	extractTopLevelFieldValue(String json, String fieldName) Efficiently extracts the raw text value of a top-level field from a JSON object without full parsing.
static String	extractTopLevelStringField(String json, String fieldName) Efficiently extracts a top-level string field value from a JSON object without full parsing.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JSONUtil

public JSONUtil()

Method Detail

extractTopLevelStringField

public static String extractTopLevelStringField(String json,
                                                String fieldName)

Efficiently extracts a top-level string field value from a JSON object without full parsing. Only scans the top-level keys of the JSON structure, skipping nested objects and arrays by tracking brace/bracket depth. Returns null if the field is not found or its value is not a string.

This avoids the cost of building a full object tree via JSON.parseObject() when only a few top-level fields are needed.

extractTopLevelFieldValue

public static String extractTopLevelFieldValue(String json,
                                               String fieldName)

Efficiently extracts the raw text value of a top-level field from a JSON object without full parsing. Works for any JSON value type: string, number, boolean, and null. Only scans the top-level keys of the JSON structure, skipping nested objects and arrays by tracking brace/bracket depth. Returns null if the field is not found.

For string values, the surrounding quotes are stripped. For all other value types (number, boolean, null), the raw text is returned as-is.