Package org.apache.el.lang

Class ELArithmetic

java.lang.Object

org.apache.el.lang.ELArithmetic

Direct Known Subclasses:

ELArithmetic.BigDecimalDelegate, ELArithmetic.BigIntegerDelegate, ELArithmetic.DoubleDelegate, ELArithmetic.LongDelegate

public abstract class ELArithmetic
extends java.lang.Object

A helper class of Arithmetic defined by the EL Specification.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ELArithmetic.BigDecimalDelegate	Arithmetic delegate for BigDecimal operations.
static class	ELArithmetic.BigIntegerDelegate	Arithmetic delegate for BigInteger operations.
static class	ELArithmetic.DoubleDelegate	Arithmetic delegate for double/float operations.
static class	ELArithmetic.LongDelegate	Arithmetic delegate for long/integer operations.

Field Summary

Fields

Modifier and Type	Field	Description
static ELArithmetic.BigDecimalDelegate	BIGDECIMAL	BigDecimal arithmetic delegate instance.
static ELArithmetic.BigIntegerDelegate	BIGINTEGER	BigInteger arithmetic delegate instance.
static ELArithmetic.DoubleDelegate	DOUBLE	Double arithmetic delegate instance.
static ELArithmetic.LongDelegate	LONG	Long arithmetic delegate instance.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ELArithmetic()	Protected constructor for subclasses.

Method Summary

Modifier and Type	Method	Description
protected abstract java.lang.Number	add(java.lang.Number num0, java.lang.Number num1)	Add two numbers.
static java.lang.Number	add(java.lang.Object obj0, java.lang.Object obj1)	Add two objects, coercing them to the appropriate numeric type.
protected abstract java.lang.Number	coerce(java.lang.Number num)	Coerce a number to the delegate's preferred type.
protected java.lang.Number	coerce(java.lang.Object obj)	Coerce an object to a number.
protected abstract java.lang.Number	coerce(java.lang.String str)	Coerce a string to a number.
protected abstract java.lang.Number	divide(java.lang.Number num0, java.lang.Number num1)	Divide two numbers.
static java.lang.Number	divide(java.lang.Object obj0, java.lang.Object obj1)	Divide two objects, coercing them to the appropriate numeric type.
static boolean	isNumber(java.lang.Object obj)	Check if the given object is a number.
static boolean	isNumberType(java.lang.Class<?> type)	Check if the given class is a number type.
protected abstract boolean	matches(java.lang.Object obj0, java.lang.Object obj1)	Check if this delegate matches the given operand types.
protected abstract java.lang.Number	mod(java.lang.Number num0, java.lang.Number num1)	Compute the modulo of two numbers.
static java.lang.Number	mod(java.lang.Object obj0, java.lang.Object obj1)	Compute the modulo of two objects, coercing them to the appropriate numeric type.
protected abstract java.lang.Number	multiply(java.lang.Number num0, java.lang.Number num1)	Multiply two numbers.
static java.lang.Number	multiply(java.lang.Object obj0, java.lang.Object obj1)	Multiply two objects, coercing them to the appropriate numeric type.
protected abstract java.lang.Number	subtract(java.lang.Number num0, java.lang.Number num1)	Subtract two numbers.
static java.lang.Number	subtract(java.lang.Object obj0, java.lang.Object obj1)	Subtract two objects, coercing them to the appropriate numeric type.

Methods inherited from class java.lang.Object

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

Field Detail

BIGDECIMAL

public static final ELArithmetic.BigDecimalDelegate BIGDECIMAL

BigDecimal arithmetic delegate instance.

BIGINTEGER

public static final ELArithmetic.BigIntegerDelegate BIGINTEGER

BigInteger arithmetic delegate instance.

DOUBLE

public static final ELArithmetic.DoubleDelegate DOUBLE

Double arithmetic delegate instance.

LONG

public static final ELArithmetic.LongDelegate LONG

Long arithmetic delegate instance.

Constructor Detail

ELArithmetic

protected ELArithmetic()

Protected constructor for subclasses.

Method Detail

add

public static java.lang.Number add(java.lang.Object obj0,
                                   java.lang.Object obj1)

Add two objects, coercing them to the appropriate numeric type.

Parameters:

obj0 - The first operand

obj1 - The second operand

Returns:

The result of the addition

mod

public static java.lang.Number mod(java.lang.Object obj0,
                                   java.lang.Object obj1)

Compute the modulo of two objects, coercing them to the appropriate numeric type.

Parameters:

obj0 - The dividend

obj1 - The divisor

Returns:

The result of the modulo operation

subtract

public static java.lang.Number subtract(java.lang.Object obj0,
                                        java.lang.Object obj1)

Subtract two objects, coercing them to the appropriate numeric type.

Parameters:

obj0 - The minuend

obj1 - The subtrahend

Returns:

The result of the subtraction

divide

public static java.lang.Number divide(java.lang.Object obj0,
                                      java.lang.Object obj1)

Divide two objects, coercing them to the appropriate numeric type.

Parameters:

obj0 - The dividend

obj1 - The divisor

Returns:

The result of the division

multiply

public static java.lang.Number multiply(java.lang.Object obj0,
                                        java.lang.Object obj1)

Multiply two objects, coercing them to the appropriate numeric type.

Parameters:

obj0 - The first factor

obj1 - The second factor

Returns:

The result of the multiplication

isNumber

public static boolean isNumber(java.lang.Object obj)

Check if the given object is a number.

Parameters:

obj - The object to check

Returns:

true if the object is a number

isNumberType

public static boolean isNumberType(java.lang.Class<?> type)

Check if the given class is a number type.

Parameters:

type - The class to check

Returns:

true if the class is a number type

add

protected abstract java.lang.Number add(java.lang.Number num0,
                                        java.lang.Number num1)

Add two numbers.

Parameters:

num0 - The first number

num1 - The second number

Returns:

The sum

multiply

protected abstract java.lang.Number multiply(java.lang.Number num0,
                                             java.lang.Number num1)

Multiply two numbers.

Parameters:

num0 - The first number

num1 - The second number

Returns:

The product

subtract

protected abstract java.lang.Number subtract(java.lang.Number num0,
                                             java.lang.Number num1)

Subtract two numbers.

Parameters:

num0 - The minuend

num1 - The subtrahend

Returns:

The difference

mod

protected abstract java.lang.Number mod(java.lang.Number num0,
                                        java.lang.Number num1)

Compute the modulo of two numbers.

Parameters:

num0 - The dividend

num1 - The divisor

Returns:

The remainder

coerce

protected abstract java.lang.Number coerce(java.lang.Number num)

Coerce a number to the delegate's preferred type.

Parameters:

num - The number to coerce

Returns:

The coerced number

coerce

protected final java.lang.Number coerce(java.lang.Object obj)

Coerce an object to a number.

Parameters:

obj - The object to coerce

Returns:

The coerced number

coerce

protected abstract java.lang.Number coerce(java.lang.String str)

Coerce a string to a number.

Parameters:

str - The string to coerce

Returns:

The coerced number

divide

protected abstract java.lang.Number divide(java.lang.Number num0,
                                           java.lang.Number num1)

Divide two numbers.

Parameters:

num0 - The dividend

num1 - The divisor

Returns:

The quotient

matches

protected abstract boolean matches(java.lang.Object obj0,
                                   java.lang.Object obj1)

Check if this delegate matches the given operand types.

Parameters:

obj0 - The first operand

obj1 - The second operand

Returns:

true if this delegate should handle these types