Class OgnlOps

  • All Implemented Interfaces:
    NumericTypes

    public abstract class OgnlOps
    extends Object
    implements NumericTypes
    This is an abstract class with static methods that define the operations of OGNL.
    • Constructor Detail

      • OgnlOps

        public OgnlOps()
    • Method Detail

      • compareWithConversion

        public static int compareWithConversion​(Object v1,
                                                Object v2)
        Compares two objects for equality, even if it has to convert one of them to the other type. If both objects are numeric they are converted to the widest type and compared. If one is non-numeric and one is numeric the non-numeric is converted to double and compared to the double numeric value. If both are non-numeric and Comparable and the types are compatible (i.e. v1 is of the same or superclass of v2's type) they are compared with Comparable.compareTo(). If both values are non-numeric and not Comparable or of incompatible classes this will throw and IllegalArgumentException.
        Parameters:
        v1 - First value to compare
        v2 - second value to compare
        Returns:
        integer describing the comparison between the two objects. A negative number indicates that v1 < v2. Positive indicates that v1 > v2. Zero indicates v1 == v2.
        Throws:
        IllegalArgumentException - if the objects are both non-numeric yet of incompatible types or do not implement Comparable.
      • isEqual

        public static boolean isEqual​(Object object1,
                                      Object object2)
        Returns true if object1 is equal to object2 in either the sense that they are the same object or, if both are non-null if they are equal in the equals() sense.
        Parameters:
        object1 - First object to compare
        object2 - Second object to compare
        Returns:
        true if v1 == v2
      • booleanValue

        public static boolean booleanValue​(boolean value)
      • booleanValue

        public static boolean booleanValue​(int value)
      • booleanValue

        public static boolean booleanValue​(float value)
      • booleanValue

        public static boolean booleanValue​(long value)
      • booleanValue

        public static boolean booleanValue​(double value)
      • booleanValue

        public static boolean booleanValue​(Object value)
        Evaluates the given object as a boolean: if it is a Boolean object, it's easy; if it's a Number or a Character, returns true for non-zero objects; and otherwise returns true for non-null objects.
        Parameters:
        value - an object to interpret as a boolean
        Returns:
        the boolean value implied by the given object
      • longValue

        public static long longValue​(Object value)
        Evaluates the given object as a long integer.
        Parameters:
        value - an object to interpret as a long integer
        Returns:
        the long integer value implied by the given object
        Throws:
        NumberFormatException - if the given object can't be understood as a long integer
      • doubleValue

        public static double doubleValue​(Object value)
        Evaluates the given object as a double-precision floating-point number.
        Parameters:
        value - an object to interpret as a double
        Returns:
        the double value implied by the given object
        Throws:
        NumberFormatException - if the given object can't be understood as a double
      • bigIntValue

        public static BigInteger bigIntValue​(Object value)
        Evaluates the given object as a BigInteger.
        Parameters:
        value - an object to interpret as a BigInteger
        Returns:
        the BigInteger value implied by the given object
        Throws:
        NumberFormatException - if the given object can't be understood as a BigInteger
      • bigDecValue

        public static BigDecimal bigDecValue​(Object value)
        Evaluates the given object as a BigDecimal.
        Parameters:
        value - an object to interpret as a BigDecimal
        Returns:
        the BigDecimal value implied by the given object
        Throws:
        NumberFormatException - if the given object can't be understood as a BigDecimal
      • stringValue

        public static String stringValue​(Object value,
                                         boolean trim)
        Evaluates the given object as a String and trims it if the trim flag is true.
        Parameters:
        value - an object to interpret as a String
        trim - if true trims the result
        Returns:
        the String value implied by the given object as returned by the toString() method, or "null" if the object is null.
      • stringValue

        public static String stringValue​(Object value)
        Evaluates the given object as a String.
        Parameters:
        value - an object to interpret as a String
        Returns:
        the String value implied by the given object as returned by the toString() method, or "null" if the object is null.
      • getNumericType

        public static int getNumericType​(Object value)
        Returns a constant from the NumericTypes interface that represents the numeric type of the given object.
        Parameters:
        value - an object that needs to be interpreted as a number
        Returns:
        the appropriate constant from the NumericTypes interface
      • convertValue

        public static Object convertValue​(Object value,
                                          Class<?> toType)
        Returns the value converted numerically to the given class type This method also detects when arrays are being converted and converts the components of one array to the type of the other.
        Parameters:
        value - an object to be converted to the given type
        toType - class type to be converted to
        Returns:
        converted value of the type given, or value if the value cannot be converted to the given type.
      • convertValue

        public static <T> Object convertValue​(Object value,
                                              Class<T> toType,
                                              boolean preventNulls)
      • getIntValue

        public static int getIntValue​(Object value)
        Converts the specified value to a primitive integer value.
        • Null values will cause a -1 to be returned.
        • Number instances have their intValue() methods invoked.
        • All other types result in calling Integer.parseInt(value.toString());
        Parameters:
        value - The object to get the value of.
        Returns:
        A valid integer.
      • getNumericType

        public static int getNumericType​(Object v1,
                                         Object v2)
        Returns the constant from the NumericTypes interface that best expresses the type of a numeric operation on the two given objects.
        Parameters:
        v1 - one argument to a numeric operator
        v2 - the other argument
        Returns:
        the appropriate constant from the NumericTypes interface
      • getNumericType

        public static int getNumericType​(int t1,
                                         int t2,
                                         boolean canBeNonNumeric)
        Returns the constant from the NumericTypes interface that best expresses the type of an operation, which can be either numeric or not, on the two given types.
        Parameters:
        t1 - type of one argument to an operator
        t2 - type of the other argument
        canBeNonNumeric - whether the operator can be interpreted as non-numeric
        Returns:
        the appropriate constant from the NumericTypes interface
      • getNumericType

        public static int getNumericType​(Object v1,
                                         Object v2,
                                         boolean canBeNonNumeric)
        Returns the constant from the NumericTypes interface that best expresses the type of an operation, which can be either numeric or not, on the two given objects.
        Parameters:
        v1 - one argument to an operator
        v2 - the other argument
        canBeNonNumeric - whether the operator can be interpreted as non-numeric
        Returns:
        the appropriate constant from the NumericTypes interface
      • newInteger

        public static Number newInteger​(int type,
                                        long value)
        Returns a new Number object of an appropriate type to hold the given integer value. The type of the returned object is consistent with the given type argument, which is a constant from the NumericTypes interface.
        Parameters:
        type - the nominal numeric type of the result, a constant from the NumericTypes interface
        value - the integer value to convert to a Number object
        Returns:
        a Number object with the given value, of type implied by the type argument
      • newReal

        public static Number newReal​(int type,
                                     double value)
        Returns a new Number object of an appropriate type to hold the given real value. The type of the returned object is always either Float or Double, and is only Float if the given type tag (a constant from the NumericTypes interface) is FLOAT.
        Parameters:
        type - the nominal numeric type of the result, a constant from the NumericTypes interface
        value - the real value to convert to a Number object
        Returns:
        a Number object with the given value, of type implied by the type argument
      • equal

        public static boolean equal​(Object v1,
                                    Object v2)
      • less

        public static boolean less​(Object v1,
                                   Object v2)
      • greater

        public static boolean greater​(Object v1,
                                      Object v2)
      • bitNegate

        public static Object bitNegate​(Object value)
      • getEscapeString

        public static String getEscapeString​(String value)
      • getEscapedChar

        public static String getEscapedChar​(char ch)
      • castToRuntime

        public static RuntimeException castToRuntime​(Throwable t)
        Utility method that converts incoming exceptions to RuntimeException instances - or casts them if they already are.
        Parameters:
        t - The exception to cast.
        Returns:
        The exception cast to a RuntimeException.