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 Object
A helper class of Arithmetic defined by the EL Specification.

  • Field Details

  • Constructor Details

    • ELArithmetic

      protected ELArithmetic()
      Protected constructor for subclasses.

  • Method Details

    • add

      public static Number add(Object obj0, 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
      Throws:
      ELException - if the operands cannot be coerced to numbers or if the addition cannot be computed, for example overflow with extreme BigDecimal values

    • mod

      public static Number mod(Object obj0, 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
      Throws:
      ELException - if the operands cannot be coerced to numbers or if the modulo cannot be computed, for example division by zero with integer operands

    • subtract

      public static Number subtract(Object obj0, 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
      Throws:
      ELException - if the operands cannot be coerced to numbers or if the subtraction cannot be computed, for example overflow with extreme BigDecimal values

    • divide

      public static Number divide(Object obj0, 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
      Throws:
      ELException - if the operands cannot be coerced to numbers or if the division cannot be computed, for example division by zero with BigDecimal or BigInteger operands

    • multiply

      public static Number multiply(Object obj0, 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
      Throws:
      ELException - if the operands cannot be coerced to numbers or if the multiplication cannot be computed, for example overflow with extreme BigDecimal values

    • isNumber

      public static boolean isNumber(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(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 Number add(Number num0, Number num1)
      Add two numbers.
      Parameters:
      num0 - The first number
      num1 - The second number
      Returns:
      The sum

    • multiply

      protected abstract Number multiply(Number num0, Number num1)
      Multiply two numbers.
      Parameters:
      num0 - The first number
      num1 - The second number
      Returns:
      The product

    • subtract

      protected abstract Number subtract(Number num0, Number num1)
      Subtract two numbers.
      Parameters:
      num0 - The minuend
      num1 - The subtrahend
      Returns:
      The difference

    • mod

      protected abstract Number mod(Number num0, Number num1)
      Compute the modulo of two numbers.
      Parameters:
      num0 - The dividend
      num1 - The divisor
      Returns:
      The remainder

    • coerce

      protected abstract Number coerce(Number num)
      Coerce a number to the delegate's preferred type.
      Parameters:
      num - The number to coerce
      Returns:
      The coerced number

    • coerce

      protected final Number coerce(Object obj)
      Coerce an object to a number.
      Parameters:
      obj - The object to coerce
      Returns:
      The coerced number
      Throws:
      ELException - if the object cannot be coerced to a number

    • coerce

      protected abstract Number coerce(String str)
      Coerce a string to a number.
      Parameters:
      str - The string to coerce
      Returns:
      The coerced number

    • divide

      protected abstract Number divide(Number num0, Number num1)
      Divide two numbers.
      Parameters:
      num0 - The dividend
      num1 - The divisor
      Returns:
      The quotient

    • matches

      protected abstract boolean matches(Object obj0, 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