package xiaozhi.common.utils;
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import java.util.ArrayList;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import cn.hutool.core.util.ArrayUtil;
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import cn.hutool.core.util.StrUtil;
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/**
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* JSON 工具类
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* Copyright (c) 人人开源 All rights reserved.
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* Website: https://www.renren.io
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*/
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public class JsonUtils {
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private static final ObjectMapper objectMapper = new ObjectMapper();
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private static final TypeReference<Map<String, Object>> STRING_OBJECT_MAP = new TypeReference<>() {
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};
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private static final TypeReference<List<Map<String, Object>>> STRING_OBJECT_MAP_LIST = new TypeReference<>() {
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};
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public static String toJsonString(Object object) {
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try {
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return objectMapper.writeValueAsString(object);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static <T> T parseObject(String text, Class<T> clazz) {
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if (StrUtil.isEmpty(text)) {
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return null;
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}
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try {
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return objectMapper.readValue(text, clazz);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static <T> T parseObject(byte[] bytes, Class<T> clazz) {
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if (ArrayUtil.isEmpty(bytes)) {
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return null;
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}
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try {
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return objectMapper.readValue(bytes, clazz);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static <T> T parseObject(String text, TypeReference<T> typeReference) {
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try {
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return objectMapper.readValue(text, typeReference);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static <T> List<T> parseArray(String text, Class<T> clazz) {
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if (StrUtil.isEmpty(text)) {
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return new ArrayList<>();
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}
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try {
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return objectMapper.readValue(text,
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objectMapper.getTypeFactory().constructCollectionType(List.class, clazz));
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static Map<String, Object> parseMap(String text) {
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if (StrUtil.isEmpty(text)) {
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return null;
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}
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return parseObject(text, STRING_OBJECT_MAP);
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}
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public static List<Map<String, Object>> parseMapList(String text) {
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if (StrUtil.isEmpty(text)) {
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return null;
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}
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return parseObject(text, STRING_OBJECT_MAP_LIST);
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}
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public static Map<String, Object> toStringObjectMap(Object value) {
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if (value == null) {
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return null;
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}
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if (!(value instanceof Map<?, ?> map)) {
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throw new ClassCastException("Expected Map but got " + value.getClass().getName());
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}
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Map<String, Object> result = new LinkedHashMap<>(map.size());
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for (Map.Entry<?, ?> entry : map.entrySet()) {
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result.put(String.class.cast(entry.getKey()), entry.getValue());
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}
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return result;
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}
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public static List<Map<String, Object>> toStringObjectMapList(Object value) {
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if (value == null) {
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return null;
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}
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List<?> list = List.class.cast(value);
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List<Map<String, Object>> result = new ArrayList<>(list.size());
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for (Object item : list) {
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result.add(toStringObjectMap(item));
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}
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return result;
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}
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public static <T> List<T> toList(Object value, Class<T> elementType) {
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if (value == null) {
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return null;
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}
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List<?> list = List.class.cast(value);
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List<T> result = new ArrayList<>(list.size());
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for (Object item : list) {
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result.add(elementType.cast(item));
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}
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return result;
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}
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}
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