public interface DisplayedEnum {
String DEFAULT_VALUE_NAME = "value";
String DEFAULT_LABEL_NAME = "label";
default Integer getValue() {
Field field = ReflectionUtils.findField(this.getClass(), DEFAULT_VALUE_NAME);
if (field == null)
return null;
try {
field.setAccessible(true);
return Integer.parseInt(field.get(this).toString());
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
@JsonValue
default String getLabel() {
Field field = ReflectionUtils.findField(this.getClass(), DEFAULT_LABEL_NAME);
if (field == null)
return null;
try {
field.setAccessible(true);
return field.get(this).toString();
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
static <T extends Enum<T>> T valueOfEnum(Class<T> enumClass, Integer value) {
if (value == null)
throw new IllegalArgumentException("DisplayedEnum value should not be null");
if (enumClass.isAssignableFrom(DisplayedEnum.class))
throw new IllegalArgumentException("illegal DisplayedEnum type");
T[] enums = enumClass.getEnumConstants();
for (T t: enums) {
DisplayedEnum displayedEnum = (DisplayedEnum)t;
if (displayedEnum.getValue().equals(value))
return (T) displayedEnum;
}
throw new IllegalArgumentException("cannot parse integer: " + value + " to " + enumClass.getName());
}
}
public enum CommonsType implements DisplayedEnum {
NORMAL("正常", 0), INVALID("无效", 1);
String label;
Integer value;
private CommonsType(String label, Integer value) {
this.label = label;
this.value = value;
}
}
@MappedJdbcTypes(value = JdbcType.TINYINT, includeNullJdbcType = true)
public class DefaultEnumTypeHandler extends BaseTypeHandler<DisplayedEnum> {
private Class<DisplayedEnum> type;
public EnumTypeHandler(){};
public EnumTypeHandler(Class<DisplayedEnum> type) {
if (type == null) throw new IllegalArgumentException("Type argument cannot be null");
this.type = type;
}
@Override
public void setNonNullParameter(PreparedStatement ps, int i, DisplayedEnum parameter, JdbcType jdbcType)
throws SQLException {
ps.setInt(i, parameter.getValue());
}
@Override
public DisplayedEnum getNullableResult(ResultSet rs, String columnName) throws SQLException {
return convert(rs.getInt(columnName));
}
@Override
public DisplayedEnum getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
return convert(rs.getInt(columnIndex));
}
@Override
public DisplayedEnum getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
return convert(cs.getInt(columnIndex));
}
private DisplayedEnum convert(int status){
DisplayedEnum[] objs = type.getEnumConstants();
for(DisplayedEnum em: objs){
if(em.getValue() == status){
return em;
}
}
return null;
}
}
<resultMap id="xxx" type="xxx"> ... <result column="type" jdbcType="TINYINT" property="type" typeHandler="xxx.xxx.xxx.DefaultEnumTypeHandler" /> ... </resultMap>
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