程序包 org.apache.pulsar.common.util

类 FieldParser

java.lang.Object

org.apache.pulsar.common.util.FieldParser

public final class FieldParser
extends Object

Generic value converter.

Use examples

 String o1 = String.valueOf(1);
 ;
 Integer i = FieldParser.convert(o1, Integer.class);
 System.out.println(i); // 1

 

构造器概要

构造器

构造器	说明
FieldParser()

方法概要

修饰符和类型	方法	说明
static String	booleanToString(Boolean value)	Converts Boolean to String.
static <T> T	convert(Object from, Class<T> to)	Convert the given object value to the given class.
static String	integerToString(Integer value)	Converts Integer to String.
static <T> void	setEmptyValue(String strValue, Field field, T obj)	Sets the empty/null value if field is allowed to be set empty.
static Boolean	stringToBoolean(String value)	Converts String to Boolean.
static Double	stringToDouble(String val)	Converts String to Double.
static Float	stringToFloat(String val)	Converts String to float.
static Integer	stringToInteger(String val)	Converts String to Integer.
static <T> List<T>	stringToList(String val, Class<T> type)	Converts comma separated string to List.
static Long	stringToLong(String val)	Converts String to Long.
static <T> Set<T>	stringToSet(String val, Class<T> type)	Converts comma separated string to Set.
static <T> void	update(Map<String,String> properties, T obj)	Update given Object attribute by reading it from provided map properties.
static Object	value(String strValue, Field field)	Converts value as per appropriate DataType of the field.

从类继承的方法 java.lang.Object

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

构造器详细资料

FieldParser

public FieldParser()

方法详细资料

convert

public static <T> T convert(Object from,
 Class<T> to)

Convert the given object value to the given class.

参数:

from - The object value to be converted.

to - The type class which the given object should be converted to.

返回:

The converted object value.

抛出:

UnsupportedOperationException - If no suitable converter can be found.

RuntimeException - If conversion failed somehow. This can be caused by at least an ExceptionInInitializerError, IllegalAccessException or InvocationTargetException.

update

public static <T> void update(Map<String,String> properties,
 T obj)
                       throws IllegalArgumentException

Update given Object attribute by reading it from provided map properties.

参数:

properties - which key-value pair of properties to assign those values to given object

obj - object which needs to be updated

抛出:

IllegalArgumentException - if the properties key-value contains incorrect value type

value

public static Object value(String strValue,
 Field field)

Converts value as per appropriate DataType of the field.

参数:

strValue - : string value of the object

field - : field of the attribute

返回:

setEmptyValue

public static <T> void setEmptyValue(String strValue,
 Field field,
 T obj)
                              throws IllegalArgumentException,
IllegalAccessException

Sets the empty/null value if field is allowed to be set empty.

参数:

strValue -

field -

obj -

抛出:

IllegalArgumentException

IllegalAccessException

stringToInteger

public static Integer stringToInteger(String val)

Converts String to Integer.

参数:

val - The String to be converted.

返回:

The converted Integer value.

stringToLong

public static Long stringToLong(String val)

Converts String to Long.

参数:

val - The String to be converted.

返回:

The converted Long value.

stringToDouble

public static Double stringToDouble(String val)

Converts String to Double.

参数:

val - The String to be converted.

返回:

The converted Double value.

stringToFloat

public static Float stringToFloat(String val)

Converts String to float.

参数:

val - The String to be converted.

返回:

The converted Double value.

stringToList

public static <T> List<T> stringToList(String val,
 Class<T> type)

Converts comma separated string to List.

类型参数:

T - type of list

参数:

val - comma separated values.

返回:

The converted list with type <T>.

stringToSet

public static <T> Set<T> stringToSet(String val,
 Class<T> type)

Converts comma separated string to Set.

类型参数:

T - type of set

参数:

val - comma separated values.

返回:

The converted set with type <T>.

integerToString

public static String integerToString(Integer value)

Converts Integer to String.

参数:

value - The Integer to be converted.

返回:

The converted String value.

booleanToString

public static String booleanToString(Boolean value)

Converts Boolean to String.

参数:

value - The Boolean to be converted.

返回:

The converted String value.

stringToBoolean

public static Boolean stringToBoolean(String value)

Converts String to Boolean.

参数:

value - The String to be converted.

返回:

The converted Boolean value.