org.springframework.expression.common

类 ExpressionUtils

java.lang.Object

org.springframework.expression.common.ExpressionUtils

public abstract class ExpressionUtils
extends Object

Common utility functions that may be used by any Expression Language provider.

从以下版本开始:

3.0

作者:

Andy Clement, Juergen Hoeller

构造器概要

构造器

构造器和说明
ExpressionUtils()

方法概要

限定符和类型	方法和说明
static <T> T	convertTypedValue(EvaluationContext context, TypedValue typedValue, Class<T> targetType) Determines if there is a type converter available in the specified context and attempts to use it to convert the supplied value to the specified type.
static boolean	toBoolean(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to a boolean using the supplied type converter.
static byte	toByte(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to a byte using the supplied type converter.
static char	toChar(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to a char using the supplied type converter.
static double	toDouble(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to a double using the supplied type converter.
static float	toFloat(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to a float using the supplied type converter.
static int	toInt(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to an int using the supplied type converter.
static long	toLong(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to a long using the supplied type converter.
static short	toShort(TypeConverter typeConverter, TypedValue typedValue) Attempt to convert a typed value to a short using the supplied type converter.

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

ExpressionUtils

public ExpressionUtils()

方法详细资料

convertTypedValue

@Nullable
public static <T> T convertTypedValue(@Nullable
                                                 EvaluationContext context,
                                                 TypedValue typedValue,
                                                 @Nullable
                                                 Class<T> targetType)

Determines if there is a type converter available in the specified context and attempts to use it to convert the supplied value to the specified type. Throws an exception if conversion is not possible.

参数:

context - the evaluation context that may define a type converter

typedValue - the value to convert and a type descriptor describing it

targetType - the type to attempt conversion to

返回:

the converted value

抛出:

EvaluationException - if there is a problem during conversion or conversion of the value to the specified type is not supported

toInt

public static int toInt(TypeConverter typeConverter,
                        TypedValue typedValue)

Attempt to convert a typed value to an int using the supplied type converter.

toBoolean

public static boolean toBoolean(TypeConverter typeConverter,
                                TypedValue typedValue)

Attempt to convert a typed value to a boolean using the supplied type converter.

toDouble

public static double toDouble(TypeConverter typeConverter,
                              TypedValue typedValue)

Attempt to convert a typed value to a double using the supplied type converter.

toLong

public static long toLong(TypeConverter typeConverter,
                          TypedValue typedValue)

Attempt to convert a typed value to a long using the supplied type converter.

toChar

public static char toChar(TypeConverter typeConverter,
                          TypedValue typedValue)

Attempt to convert a typed value to a char using the supplied type converter.

toShort

public static short toShort(TypeConverter typeConverter,
                            TypedValue typedValue)

Attempt to convert a typed value to a short using the supplied type converter.

toFloat

public static float toFloat(TypeConverter typeConverter,
                            TypedValue typedValue)

Attempt to convert a typed value to a float using the supplied type converter.

toByte

public static byte toByte(TypeConverter typeConverter,
                          TypedValue typedValue)

Attempt to convert a typed value to a byte using the supplied type converter.