cn.hutool.core.convert.ConverterRegistry Maven / Gradle / Ivy
package cn.hutool.core.convert;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.convert.impl.*;
import cn.hutool.core.date.DateTime;
import cn.hutool.core.lang.Opt;
import cn.hutool.core.lang.Pair;
import cn.hutool.core.lang.TypeReference;
import cn.hutool.core.map.SafeConcurrentHashMap;
import cn.hutool.core.util.*;
import java.io.Serializable;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URI;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.time.*;
import java.time.temporal.TemporalAccessor;
import java.util.*;
import java.util.concurrent.atomic.*;
/**
* 转换器登记中心
*
* 将各种类型Convert对象放入登记中心，通过convert方法查找目标类型对应的转换器，将被转换对象转换之。
*
*
* 在此类中，存放着默认转换器和自定义转换器，默认转换器是Hutool中预定义的一些转换器，自定义转换器存放用户自定的转换器。
*
*
* @author Looly
*/
public class ConverterRegistry implements Serializable {
private static final long serialVersionUID = 1L;
/**
* 默认类型转换器
*/
private Map, Converter> defaultConverterMap;
/**
* 用户自定义类型转换器
*/
private volatile Map> customConverterMap;
/**
* 类级的内部类，也就是静态的成员式内部类，该内部类的实例与外部类的实例 没有绑定关系，而且只有被调用到才会装载，从而实现了延迟加载
*/
private static class SingletonHolder {
/**
* 静态初始化器，由JVM来保证线程安全
*/
private static final ConverterRegistry INSTANCE = new ConverterRegistry();
}
/**
* 获得单例的 ConverterRegistry
*
* @return ConverterRegistry
*/
public static ConverterRegistry getInstance() {
return SingletonHolder.INSTANCE;
}
/**
* 构造
*/
public ConverterRegistry() {
defaultConverter();
putCustomBySpi();
}
/**
* 使用SPI加载转换器
*/
private void putCustomBySpi() {
ServiceLoaderUtil.load(Converter.class).forEach(converter -> {
try {
Type type = TypeUtil.getTypeArgument(ClassUtil.getClass(converter));
if (null != type) {
putCustom(type, converter);
}
} catch (Exception e) {
// 忽略注册失败的
}
});
}
/**
* 登记自定义转换器
*
* @param type 转换的目标类型
* @param converterClass 转换器类，必须有默认构造方法
* @return ConverterRegistry
*/
public ConverterRegistry putCustom(Type type, Class> converterClass) {
return putCustom(type, ReflectUtil.newInstance(converterClass));
}
/**
* 登记自定义转换器
*
* @param type 转换的目标类型
* @param converter 转换器
* @return ConverterRegistry
*/
public ConverterRegistry putCustom(Type type, Converter converter) {
if (null == customConverterMap) {
synchronized (this) {
if (null == customConverterMap) {
customConverterMap = new SafeConcurrentHashMap<>();
}
}
}
customConverterMap.put(type, converter);
return this;
}
/**
* 获得转换器
*
* @param 转换的目标类型
* @param type 类型
* @param isCustomFirst 是否自定义转换器优先
* @return 转换器
*/
public Converter getConverter(Type type, boolean isCustomFirst) {
Converter converter;
if (isCustomFirst) {
converter = this.getCustomConverter(type);
if (null == converter) {
converter = this.getDefaultConverter(type);
}
} else {
converter = this.getDefaultConverter(type);
if (null == converter) {
converter = this.getCustomConverter(type);
}
}
return converter;
}
/**
* 获得默认转换器
*
* @param 转换的目标类型（转换器转换到的类型）
* @param type 类型
* @return 转换器
*/
@SuppressWarnings("unchecked")
public Converter getDefaultConverter(Type type) {
final Class key = TypeUtil.getClass(type);
return (null == defaultConverterMap || null == key) ? null : (Converter) defaultConverterMap.get(key);
}
/**
* 获得自定义转换器
*
* @param 转换的目标类型（转换器转换到的类型）
* @param type 类型
* @return 转换器
*/
@SuppressWarnings("unchecked")
public Converter getCustomConverter(Type type) {
return (null == customConverterMap) ? null : (Converter) customConverterMap.get(type);
}
/**
* 转换值为指定类型
*
* @param 转换的目标类型（转换器转换到的类型）
* @param type 类型目标
* @param value 被转换值
* @param defaultValue 默认值
* @param isCustomFirst 是否自定义转换器优先
* @return 转换后的值
* @throws ConvertException 转换器不存在
*/
@SuppressWarnings("unchecked")
public T convert(Type type, Object value, T defaultValue, boolean isCustomFirst) throws ConvertException {
if (TypeUtil.isUnknown(type) && null == defaultValue) {
// 对于用户不指定目标类型的情况，返回原值
return (T) value;
}
if (ObjectUtil.isNull(value)) {
return defaultValue;
}
if (TypeUtil.isUnknown(type)) {
type = defaultValue.getClass();
}
// issue#I7WJHH，Opt和Optional处理
if (value instanceof Opt) {
value = ((Opt) value).get();
if (ObjUtil.isNull(value)) {
return defaultValue;
}
}
if (value instanceof Optional) {
value = ((Optional) value).orElse(null);
if (ObjUtil.isNull(value)) {
return defaultValue;
}
}
if (type instanceof TypeReference) {
type = ((TypeReference) type).getType();
}
// 自定义对象转换
if(value instanceof TypeConverter){
return ObjUtil.defaultIfNull((T) ((TypeConverter) value).convert(type, value), defaultValue);
}
// 标准转换器
final Converter converter = getConverter(type, isCustomFirst);
if (null != converter) {
return converter.convert(value, defaultValue);
}
Class rowType = (Class) TypeUtil.getClass(type);
if (null == rowType) {
if (null != defaultValue) {
rowType = (Class) defaultValue.getClass();
} else {
// 无法识别的泛型类型，按照Object处理
return (T) value;
}
}
// 特殊类型转换，包括Collection、Map、强转、Array等
final T result = convertSpecial(type, rowType, value, defaultValue);
if (null != result) {
return result;
}
// 尝试转Bean
if (BeanUtil.isBean(rowType)) {
return new BeanConverter(type).convert(value, defaultValue);
}
// 无法转换
throw new ConvertException("Can not Converter from [{}] to [{}]", value.getClass().getName(), type.getTypeName());
}
/**
* 转换值为指定类型
* 自定义转换器优先
*
* @param 转换的目标类型（转换器转换到的类型）
* @param type 类型
* @param value 值
* @param defaultValue 默认值
* @return 转换后的值
* @throws ConvertException 转换器不存在
*/
public T convert(Type type, Object value, T defaultValue) throws ConvertException {
return convert(type, value, defaultValue, true);
}
/**
* 转换值为指定类型
*
* @param 转换的目标类型（转换器转换到的类型）
* @param type 类型
* @param value 值
* @return 转换后的值，默认为{@code null}
* @throws ConvertException 转换器不存在
*/
public T convert(Type type, Object value) throws ConvertException {
return convert(type, value, null);
}
// ----------------------------------------------------------- Private method start
/**
* 特殊类型转换
* 包括：
*
*
* Collection
* Map
* 强转（无需转换）
* 数组
*
*
* @param 转换的目标类型（转换器转换到的类型）
* @param type 类型
* @param value 值
* @param defaultValue 默认值
* @return 转换后的值
*/
@SuppressWarnings("unchecked")
private T convertSpecial(Type type, Class rowType, Object value, T defaultValue) {
if (null == rowType) {
return null;
}
// 集合转换（不可以默认强转）
if (Collection.class.isAssignableFrom(rowType)) {
final CollectionConverter collectionConverter = new CollectionConverter(type);
return (T) collectionConverter.convert(value, (Collection) defaultValue);
}
// Map类型（不可以默认强转）
if (Map.class.isAssignableFrom(rowType)) {
final MapConverter mapConverter = new MapConverter(type);
return (T) mapConverter.convert(value, (Map) defaultValue);
}
// Map类型（不可以默认强转）
if (Map.Entry.class.isAssignableFrom(rowType)) {
final EntryConverter mapConverter = new EntryConverter(type);
return (T) mapConverter.convert(value, (Map.Entry) defaultValue);
}
// 默认强转
if (rowType.isInstance(value)) {
return (T) value;
}
// 枚举转换
if (rowType.isEnum()) {
return (T) new EnumConverter(rowType).convert(value, defaultValue);
}
// 数组转换
if (rowType.isArray()) {
final ArrayConverter arrayConverter = new ArrayConverter(rowType);
return (T) arrayConverter.convert(value, defaultValue);
}
// issue#I7FQ29 Class
if("java.lang.Class".equals(rowType.getName())){
final ClassConverter converter = new ClassConverter();
return (T) converter.convert(value, (Class) defaultValue);
}
// 空值转空Bean
if(ObjectUtil.isEmpty(value)){
// issue#3649 空值转空对象，则直接实例化
return ReflectUtil.newInstanceIfPossible(rowType);
}
// 表示非需要特殊转换的对象
return null;
}
/**
* 注册默认转换器
*
* @return 转换器
*/
private ConverterRegistry defaultConverter() {
defaultConverterMap = new SafeConcurrentHashMap<>();
// 原始类型转换器
defaultConverterMap.put(int.class, new PrimitiveConverter(int.class));
defaultConverterMap.put(long.class, new PrimitiveConverter(long.class));
defaultConverterMap.put(byte.class, new PrimitiveConverter(byte.class));
defaultConverterMap.put(short.class, new PrimitiveConverter(short.class));
defaultConverterMap.put(float.class, new PrimitiveConverter(float.class));
defaultConverterMap.put(double.class, new PrimitiveConverter(double.class));
defaultConverterMap.put(char.class, new PrimitiveConverter(char.class));
defaultConverterMap.put(boolean.class, new PrimitiveConverter(boolean.class));
// 包装类转换器
defaultConverterMap.put(Number.class, new NumberConverter());
defaultConverterMap.put(Integer.class, new NumberConverter(Integer.class));
defaultConverterMap.put(AtomicInteger.class, new NumberConverter(AtomicInteger.class));// since 3.0.8
defaultConverterMap.put(Long.class, new NumberConverter(Long.class));
defaultConverterMap.put(LongAdder.class, new NumberConverter(LongAdder.class));
defaultConverterMap.put(AtomicLong.class, new NumberConverter(AtomicLong.class));// since 3.0.8
defaultConverterMap.put(Byte.class, new NumberConverter(Byte.class));
defaultConverterMap.put(Short.class, new NumberConverter(Short.class));
defaultConverterMap.put(Float.class, new NumberConverter(Float.class));
defaultConverterMap.put(Double.class, new NumberConverter(Double.class));
defaultConverterMap.put(DoubleAdder.class, new NumberConverter(DoubleAdder.class));
defaultConverterMap.put(Character.class, new CharacterConverter());
defaultConverterMap.put(Boolean.class, new BooleanConverter());
defaultConverterMap.put(AtomicBoolean.class, new AtomicBooleanConverter());// since 3.0.8
defaultConverterMap.put(BigDecimal.class, new NumberConverter(BigDecimal.class));
defaultConverterMap.put(BigInteger.class, new NumberConverter(BigInteger.class));
defaultConverterMap.put(CharSequence.class, new StringConverter());
defaultConverterMap.put(String.class, new StringConverter());
// URI and URL
defaultConverterMap.put(URI.class, new URIConverter());
defaultConverterMap.put(URL.class, new URLConverter());
// 日期时间
defaultConverterMap.put(Calendar.class, new CalendarConverter());
defaultConverterMap.put(java.util.Date.class, new DateConverter(java.util.Date.class));
defaultConverterMap.put(DateTime.class, new DateConverter(DateTime.class));
defaultConverterMap.put(java.sql.Date.class, new DateConverter(java.sql.Date.class));
defaultConverterMap.put(java.sql.Time.class, new DateConverter(java.sql.Time.class));
defaultConverterMap.put(java.sql.Timestamp.class, new DateConverter(java.sql.Timestamp.class));
// 日期时间 JDK8+(since 5.0.0)
defaultConverterMap.put(TemporalAccessor.class, new TemporalAccessorConverter(Instant.class));
defaultConverterMap.put(Instant.class, new TemporalAccessorConverter(Instant.class));
defaultConverterMap.put(LocalDateTime.class, new TemporalAccessorConverter(LocalDateTime.class));
defaultConverterMap.put(LocalDate.class, new TemporalAccessorConverter(LocalDate.class));
defaultConverterMap.put(LocalTime.class, new TemporalAccessorConverter(LocalTime.class));
defaultConverterMap.put(ZonedDateTime.class, new TemporalAccessorConverter(ZonedDateTime.class));
defaultConverterMap.put(OffsetDateTime.class, new TemporalAccessorConverter(OffsetDateTime.class));
defaultConverterMap.put(OffsetTime.class, new TemporalAccessorConverter(OffsetTime.class));
defaultConverterMap.put(DayOfWeek.class, new TemporalAccessorConverter(DayOfWeek.class));
defaultConverterMap.put(Month.class, new TemporalAccessorConverter(Month.class));
defaultConverterMap.put(MonthDay.class, new TemporalAccessorConverter(MonthDay.class));
defaultConverterMap.put(Period.class, new PeriodConverter());
defaultConverterMap.put(Duration.class, new DurationConverter());
// Reference
defaultConverterMap.put(WeakReference.class, new ReferenceConverter(WeakReference.class));// since 3.0.8
defaultConverterMap.put(SoftReference.class, new ReferenceConverter(SoftReference.class));// since 3.0.8
defaultConverterMap.put(AtomicReference.class, new AtomicReferenceConverter());// since 3.0.8
//AtomicXXXArray，since 5.4.5
defaultConverterMap.put(AtomicIntegerArray.class, new AtomicIntegerArrayConverter());
defaultConverterMap.put(AtomicLongArray.class, new AtomicLongArrayConverter());
// 其它类型
defaultConverterMap.put(TimeZone.class, new TimeZoneConverter());
defaultConverterMap.put(Locale.class, new LocaleConverter());
defaultConverterMap.put(Charset.class, new CharsetConverter());
defaultConverterMap.put(Path.class, new PathConverter());
defaultConverterMap.put(Currency.class, new CurrencyConverter());// since 3.0.8
defaultConverterMap.put(UUID.class, new UUIDConverter());// since 4.0.10
defaultConverterMap.put(StackTraceElement.class, new StackTraceElementConverter());// since 4.5.2
defaultConverterMap.put(Optional.class, new OptionalConverter());// since 5.0.0
defaultConverterMap.put(Opt.class, new OptConverter());// since 5.7.16
defaultConverterMap.put(Pair.class, new PairConverter(Pair.class));// since 5.8.17
return this;
}
// ----------------------------------------------------------- Private method end
}