org.springframework.expression.common
Class 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.

Since:

3.0

Author:

Andy Clement, Juergen Hoeller

Constructor Summary

ExpressionUtils()

Method Summary

static <T> T	convert(EvaluationContext context, Object value, 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 <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.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionUtils

public ExpressionUtils()

Method Detail

convert

public static <T> T convert(EvaluationContext context,
                            Object value,
                            Class<T> targetType)
                 throws EvaluationException

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.

Parameters:

context - the evaluation context that may define a type converter

value - the value to convert (may be null)

targetType - the type to attempt conversion to

Returns:

the converted value

Throws:

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

convertTypedValue

public 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. Throws an exception if conversion is not possible.

Parameters:

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

Returns:

the converted value

Throws:

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.