Constructor Detail

• ELSupport

  public ELSupport()

Method Detail

• compare

  public static final int compare(java.lang.Object obj0,
            java.lang.Object obj1)
                           throws ELException

  Compare two objects, after coercing to the same type if appropriate. If the objects are identical, or they are equal according to equals(Object, Object) then return 0. If either object is a BigDecimal, then coerce both to BigDecimal first. Similarly for Double(Float), BigInteger, and Long(Integer, Char, Short, Byte). Otherwise, check that the first object is an instance of Comparable, and compare against the second object. If that is null, return 1, otherwise return the result of comparing against the second object. Similarly, if the second object is Comparable, if the first is null, return -1, else return the result of comparing against the first object. A null object is considered as:

  • ZERO when compared with Numbers
  • the empty string for String compares
  • Otherwise null is considered to be lower than anything else.

  Parameters:

  obj0 - first object

  obj1 - second object

  Returns:

  -1, 0, or 1 if this object is less than, equal to, or greater than val.

  Throws:

  ELException - if neither object is Comparable

  java.lang.ClassCastException - if the objects are not mutually comparable

• equals

  public static final boolean equals(java.lang.Object obj0,
               java.lang.Object obj1)
                              throws ELException

  Compare two objects for equality, after coercing to the same type if appropriate. If the objects are identical (including both null) return true. If either object is null, return false. If either object is Boolean, coerce both to Boolean and check equality. Similarly for Enum, String, BigDecimal, Double(Float), Long(Integer, Short, Byte, Character) Otherwise default to using Object.equals().

  Parameters:

  obj0 - the first object

  obj1 - the second object

  Returns:

  true if the objects are equal

  Throws:

  ELException

• coerceToEnum

  public static final java.lang.Enum<?> coerceToEnum(java.lang.Object obj,
                               java.lang.Class type)

• coerceToBoolean

  public static final java.lang.Boolean coerceToBoolean(java.lang.Object obj)
                                                 throws ELException

  Convert an object to Boolean. Null and empty string are false.

  Parameters:

  obj - the object to convert

  Returns:

  the Boolean value of the object

  Throws:

  ELException - if object is not Boolean or String

• coerceToCharacter

  public static final java.lang.Character coerceToCharacter(java.lang.Object obj)
                                                     throws ELException

  Throws:

  ELException

• coerceToNumber

  protected static final java.lang.Number coerceToNumber(java.lang.Number number,
                                java.lang.Class<?> type)
                                                  throws ELException

  Throws:

  ELException

• coerceToNumber

  public static final java.lang.Number coerceToNumber(java.lang.Object obj,
                                java.lang.Class<?> type)
                                               throws ELException

  Throws:

  ELException

• coerceToNumber

  protected static final java.lang.Number coerceToNumber(java.lang.String val,
                                java.lang.Class<?> type)
                                                  throws ELException

  Throws:

  ELException

• coerceToString

  public static final java.lang.String coerceToString(java.lang.Object obj)

  Coerce an object to a string

  Parameters:

  obj -

  Returns:

  the String value of the object

• coerceToType

  public static final java.lang.Object coerceToType(java.lang.Object obj,
                              java.lang.Class<?> type)
                                             throws ELException

  Throws:

  ELException

• isBigDecimalOp

  public static final boolean isBigDecimalOp(java.lang.Object obj0,
                       java.lang.Object obj1)

• isBigIntegerOp

  public static final boolean isBigIntegerOp(java.lang.Object obj0,
                       java.lang.Object obj1)

• isDoubleOp

  public static final boolean isDoubleOp(java.lang.Object obj0,
                   java.lang.Object obj1)

• isLongOp

  public static final boolean isLongOp(java.lang.Object obj0,
                 java.lang.Object obj1)

• isStringFloat

  public static final boolean isStringFloat(java.lang.String str)