ExpressionUtils (Spring Framework 3.2.1.RELEASE API)
Date: 2013-01-24

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

    Constructors
    Constructor and Description
    `ExpressionUtils()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `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.