com.jchanghong.json.InternalJSONUtil Maven / Gradle / Ivy
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package com.jchanghong.json;
import com.jchanghong.core.convert.Convert;
import com.jchanghong.core.date.DateUtil;
import com.jchanghong.core.util.CharUtil;
import com.jchanghong.core.util.NumberUtil;
import com.jchanghong.core.util.ObjectUtil;
import com.jchanghong.core.util.StrUtil;
import java.io.IOException;
import java.io.Writer;
import java.time.temporal.TemporalAccessor;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
/**
* 内部JSON工具类，仅用于JSON内部使用
*
* @author Looly
*/
final class InternalJSONUtil {
private InternalJSONUtil() {
}
/**
* 写入值到Writer
*
* @param writer Writer
* @param value 值
* @param indentFactor 缩进因子，定义每一级别增加的缩进量
* @param indent 缩进空格数
* @param config 配置项
* @return Writer
* @throws JSONException JSON异常
* @throws IOException IO异常
*/
protected static Writer writeValue(Writer writer, Object value, int indentFactor, int indent, JSONConfig config) throws JSONException, IOException {
if (value == null || value instanceof JSONNull) {
writer.write(JSONNull.NULL.toString());
} else if (value instanceof JSON) {
((JSON) value).write(writer, indentFactor, indent);
} else if (value instanceof Map) {
new JSONObject(value).write(writer, indentFactor, indent);
} else if (value instanceof Iterable || value instanceof Iterator || value.getClass().isArray()) {
new JSONArray(value).write(writer, indentFactor, indent);
} else if (value instanceof Number) {
writer.write(NumberUtil.toStr((Number) value));
} else if (value instanceof Date || value instanceof Calendar || value instanceof TemporalAccessor) {
final String format = (null == config) ? null : config.getDateFormat();
writer.write(formatDate(value, format));
} else if (value instanceof Boolean) {
writer.write(value.toString());
} else if (value instanceof JSONString) {
String valueStr;
try {
valueStr = ((JSONString) value).toJSONString();
} catch (Exception e) {
throw new JSONException(e);
}
writer.write(valueStr != null ? valueStr : JSONUtil.quote(value.toString()));
} else {
JSONUtil.quote(value.toString(), writer);
}
return writer;
}
/**
* 缩进，使用空格符
*
* @param writer writer
* @param indent 随进空格数
* @throws IOException IO异常
*/
protected static void indent(Writer writer, int indent) throws IOException {
for (int i = 0; i < indent; i += 1) {
writer.write(CharUtil.SPACE);
}
}
/**
* 如果对象是Number 且是 NaN or infinite，将抛出异常
*
* @param obj 被检查的对象
* @throws JSONException If o is a non-finite number.
*/
protected static void testValidity(Object obj) throws JSONException {
if (false == ObjectUtil.isValidIfNumber(obj)) {
throw new JSONException("JSON does not allow non-finite numbers.");
}
}
/**
* 值转为String，用于JSON中。 If the object has an value.toJSONString() method, then that method will be used to produce the JSON text.
* The method is required to produce a strictly conforming text.
* If the object does not contain a toJSONString method (which is the most common case), then a text will be produced by other means.
* If the value is an array or Collection, then a JSONArray will be made from it and its toJSONString method will be called.
* If the value is a MAP, then a JSONObject will be made from it and its toJSONString method will be called.
* Otherwise, the value's toString method will be called, and the result will be quoted.
*
* @param value 需要转为字符串的对象
* @return 字符串
* @throws JSONException If the value is or contains an invalid number.
*/
protected static String valueToString(Object value) throws JSONException {
if (value == null || value instanceof JSONNull) {
return "null";
}
if (value instanceof JSONString) {
try {
return ((JSONString) value).toJSONString();
} catch (Exception e) {
throw new JSONException(e);
}
} else if (value instanceof Number) {
return NumberUtil.toStr((Number) value);
} else if (value instanceof Boolean || value instanceof JSONObject || value instanceof JSONArray) {
return value.toString();
} else if (value instanceof Map) {
Map map = (Map) value;
return new JSONObject(map).toString();
} else if (value instanceof Collection) {
Collection coll = (Collection) value;
return new JSONArray(coll).toString();
} else if (value.getClass().isArray()) {
return new JSONArray(value).toString();
} else {
return JSONUtil.quote(value.toString());
}
}
/**
* 尝试转换字符串为number, boolean, or null，无法转换返回String
*
* @param string A String.
* @return A simple JSON value.
*/
protected static Object stringToValue(String string) {
if (null == string || "null".equalsIgnoreCase(string)) {
return JSONNull.NULL;
}
if (StrUtil.EMPTY.equals(string)) {
return string;
}
if ("true".equalsIgnoreCase(string)) {
return Boolean.TRUE;
}
if ("false".equalsIgnoreCase(string)) {
return Boolean.FALSE;
}
/* If it might be a number, try converting it. If a number cannot be produced, then the value will just be a string. */
char b = string.charAt(0);
if ((b >= '0' && b <= '9') || b == '-') {
try {
if (string.indexOf('.') > -1 || string.indexOf('e') > -1 || string.indexOf('E') > -1) {
double d = Double.parseDouble(string);
if (false == Double.isInfinite(d) && false == Double.isNaN(d)) {
return d;
}
} else {
Long myLong = new Long(string);
if (string.equals(myLong.toString())) {
if (myLong == myLong.intValue()) {
return myLong.intValue();
} else {
return myLong;
}
}
}
} catch (Exception ignore) {
}
}
return string;
}
/**
* 将Property的键转化为JSON形式
* 用于识别类似于：com.luxiaolei.package.hutool这类用点隔开的键
*
* @param jsonObject JSONObject
* @param key 键
* @param value 值
* @return JSONObject
*/
protected static JSONObject propertyPut(JSONObject jsonObject, Object key, Object value) {
final String[] path = StrUtil.split(Convert.toStr(key), StrUtil.DOT);
int last = path.length - 1;
JSONObject target = jsonObject;
for (int i = 0; i < last; i += 1) {
String segment = path[i];
JSONObject nextTarget = target.getJSONObject(segment);
if (nextTarget == null) {
nextTarget = new JSONObject(target.getConfig());
target.set(segment, nextTarget);
}
target = nextTarget;
}
target.set(path[last], value);
return jsonObject;
}
/**
* 默认情况下是否忽略null值的策略选择，以下对象不忽略null值，其它对象忽略：
*
*
* 1. CharSequence
* 2. JSONTokener
* 3. Map
*
*
* @param obj 需要检查的对象
* @return 是否忽略null值
* @since 4.3.1
*/
protected static boolean defaultIgnoreNullValue(Object obj) {
return (false == (obj instanceof CharSequence))//
&& (false == (obj instanceof JSONTokener))//
&& (false == (obj instanceof Map));
}
/**
* 按照给定格式格式化日期，格式为空时返回时间戳字符串
*
* @param dateObj Date或者Calendar对象
* @param format 格式
* @return 日期字符串
*/
private static String formatDate(Object dateObj, String format) {
if (StrUtil.isNotBlank(format)) {
//用户定义了日期格式
return JSONUtil.quote(DateUtil.format(Convert.toDate(dateObj), format));
}
//默认使用时间戳
long timeMillis;
if (dateObj instanceof TemporalAccessor) {
timeMillis = DateUtil.toInstant((TemporalAccessor) dateObj).toEpochMilli();
} else if (dateObj instanceof Date) {
timeMillis = ((Date) dateObj).getTime();
} else if (dateObj instanceof Calendar) {
timeMillis = ((Calendar) dateObj).getTimeInMillis();
} else {
throw new UnsupportedOperationException("Unsupported Date type: " + dateObj.getClass());
}
return String.valueOf(timeMillis);
}
}