Package net.sf.saxon.value

Class DoubleValue

    • Constructor Detail

      • DoubleValue

        public DoubleValue​(double value)
        Constructor supplying a double
        Parameters:
        value - the value of the NumericValue

      • DoubleValue

        public DoubleValue​(double value,
                   AtomicType typeLabel)
        Constructor supplying a double and an AtomicType, for creating a value that belongs to a user-defined subtype of xs:double. It is the caller's responsibility to ensure that the supplied value conforms to the supplied type.
        Parameters:
        value - the value of the NumericValue
        typeLabel - the type of the value. This must be a subtype of xs:double, and the value must conform to this type. The method does not check these conditions.

    • Method Detail

      • makeDoubleValue

        public static DoubleValue makeDoubleValue​(double value)
        Static factory method (for convenience in compiled bytecode)
        Parameters:
        value - the value of the double
        Returns:
        a new DoubleValue

      • copyAsSubType

        public AtomicValue copyAsSubType​(AtomicType typeLabel)
        Create a copy of this atomic value, with a different type label
        Specified by:
        copyAsSubType in class AtomicValue
        Parameters:
        typeLabel - the type label of the new copy. The caller is responsible for checking that the value actually conforms to this type.
        Returns:
        the copied value

      • getPrimitiveType

        public BuiltInAtomicType getPrimitiveType()
        Determine the primitive type of the value. This delivers the same answer as getItemType().getPrimitiveItemType(). The primitive types are the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration, and xs:untypedAtomic. For external objects, the result is AnyAtomicType.
        Specified by:
        getPrimitiveType in class AtomicValue
        Returns:
        the primitive type

      • getDoubleValue

        public double getDoubleValue()
        Return this numeric value as a double
        Specified by:
        getDoubleValue in class NumericValue
        Returns:
        the value as a double

      • getFloatValue

        public float getFloatValue()
        Get the numeric value converted to a float
        Specified by:
        getFloatValue in class NumericValue
        Returns:
        a float representing this numeric value; NaN if it cannot be converted

      • getDecimalValue

        public java.math.BigDecimal getDecimalValue()
                                     throws ValidationException
        Get the numeric value converted to a decimal
        Specified by:
        getDecimalValue in class NumericValue
        Returns:
        a decimal representing this numeric value;
        Throws:
        ValidationException - if the value cannot be converted, for example if it is NaN or infinite

      • longValue

        public long longValue()
               throws XPathException
        Return the numeric value as a Java long.
        Specified by:
        longValue in class NumericValue
        Returns:
        the numeric value as a Java long. This performs truncation towards zero.
        Throws:
        XPathException - if the value cannot be converted

      • hashCode

        public int hashCode()
        Get the hashCode. This must conform to the rules for other NumericValue hashcodes
        Specified by:
        hashCode in class NumericValue
        Returns:
        the hash code of the numeric value
        See Also:
        NumericValue.hashCode()

      • isNaN

        public boolean isNaN()
        Test whether the value is the double/float value NaN
        Overrides:
        isNaN in class AtomicValue
        Returns:
        true if the value is float NaN or double NaN or precisionDecimal NaN; otherwise false

      • getCanonicalLexicalRepresentation

        public UnicodeString getCanonicalLexicalRepresentation()
        Get the canonical lexical representation as defined in XML Schema. This is not always the same as the result of casting to a string according to the XPath rules. For xs:double, the canonical representation always uses exponential notation.
        Specified by:
        getCanonicalLexicalRepresentation in interface AtomicSequence
        Overrides:
        getCanonicalLexicalRepresentation in class AtomicValue
        Returns:
        the value, represented as a string using exponential notation

      • doubleToString

        public static UnicodeString doubleToString​(double value)
        Internal method used for conversion of a double to a string
        Parameters:
        value - the actual value
        Returns:
        the value converted to a string, according to the XPath casting rules.

      • negate

        public NumericValue negate()
        Negate the value
        Specified by:
        negate in class NumericValue
        Returns:
        a value, of the same type as the original, with its sign inverted

      • floor

        public NumericValue floor()
        Implement the XPath floor() function
        Specified by:
        floor in class NumericValue
        Returns:
        a value, of the same type as that supplied, rounded towards minus infinity

      • ceiling

        public NumericValue ceiling()
        Implement the XPath ceiling() function
        Specified by:
        ceiling in class NumericValue
        Returns:
        a value, of the same type as that supplied, rounded towards plus infinity

      • round

        public NumericValue round​(int scale)
        Implement the XPath round() function
        Specified by:
        round in class NumericValue
        Parameters:
        scale - the number of decimal places required in the result (supply 0 for rounding to an integer)
        Returns:
        a value, of the same type as that supplied, rounded towards the nearest whole number (0.5 rounded up)

      • roundHalfToEven

        public NumericValue roundHalfToEven​(int scale)
        Implement the XPath round-to-half-even() function
        Specified by:
        roundHalfToEven in class NumericValue
        Parameters:
        scale - the decimal position for rounding: e.g. 2 rounds to a multiple of 0.01, while -2 rounds to a multiple of 100
        Returns:
        a value, of the same type as the original, rounded towards the nearest multiple of 10**(-scale), with rounding towards the nearest even number if two values are equally near

      • signum

        public int signum()
        Determine whether the value is negative, zero, or positive
        Specified by:
        signum in class NumericValue
        Returns:
        -1 if negative, 0 if zero (including negative zero) or NaN, +1 if positive

      • isNegativeZero

        public boolean isNegativeZero()
        Ask whether this value is negative zero
        Overrides:
        isNegativeZero in class NumericValue
        Returns:
        true if this value is float or double negative zero

      • isWholeNumber

        public boolean isWholeNumber()
        Determine whether the value is a whole number, that is, whether it compares equal to some integer
        Specified by:
        isWholeNumber in class NumericValue
        Returns:
        true if the value is a whole number

      • asSubscript

        public int asSubscript()
        Test whether a number is a possible subscript into a sequence, that is, a whole number greater than zero and less than 2^31
        Specified by:
        asSubscript in class NumericValue
        Returns:
        the number as an int if it is a possible subscript, or -1 otherwise

      • abs

        public NumericValue abs()
        Get the absolute value as defined by the XPath abs() function
        Specified by:
        abs in class NumericValue
        Returns:
        the absolute value
        Since:
        9.2

      • compareTo

        public int compareTo​(long other)
        Compare the value to a long.
        Specified by:
        compareTo in class NumericValue
        Parameters:
        other - the value to be compared with
        Returns:
        -1 if this is less, 0 if this is equal, +1 if this is greater or if this is NaN

      • asMapKey

        public AtomicMatchKey asMapKey()
        Get a value whose equals() method follows the "same key" rules for comparing the keys of a map.
        Overrides:
        asMapKey in class AtomicValue
        Returns:
        a value with the property that the equals() and hashCode() methods follow the rules for comparing keys in maps.

      • isIdentical

        public boolean isIdentical​(AtomicValue v)
        Determine whether two atomic values are identical, as determined by XML Schema rules. This is a stronger test than equality (even schema-equality); for example two dateTime values are not identical unless they are in the same timezone.

        Note that even this check ignores the type annotation of the value. The integer 3 and the short 3 are considered identical, even though they are not fully interchangeable. "Identical" means the same point in the value space, regardless of type annotation.

        NaN is identical to itself.

        This method treats positive and negative zero as identical, even though they are not defined as such in XSD 1.1. This is justified on the basis that in all cases where values are required to be identical (for example, enumeration facets and keyref constraints), being equal is good enough.

        Overrides:
        isIdentical in class AtomicValue
        Parameters:
        v - the other value to be compared with this one
        Returns:
        true if the two values are identical, false otherwise.