Package net.sf.saxon.expr
Class Calculator
java.lang.Object
net.sf.saxon.expr.Calculator
- All Implemented Interfaces:
Serializable
This class evaluates arithmetic expressions; it acts as a helper class to the ArithmeticExpression
class. There are many subclasses for the different kinds of arithmetic expression, and static methods
that allow the right subclass to be selected, either at compile time or at run time.
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic Calculator[]
Calculators used for the six operators when the static type information does not allow a more specific calculator to be chosenstatic Calculator[]
Calculators used when both operands are xs:dateTime, xs:date, or xs:timestatic Calculator[]
Calculators used when the first operand is xs:dateTime, xs:date, or xs:time, and the second is a durationstatic Calculator[]
static Calculator[]
Calculators used when the first operand is a decimalstatic Calculator[]
static Calculator[]
static final int
static Calculator[]
static Calculator[]
Calculators used when the first operand is a doublestatic Calculator[]
static Calculator[]
static Calculator[]
Calculators used when the second operand is xs:dateTime, xs:date, or xs:time, and the first is a durationstatic Calculator[]
Calculators used when the both operands are durationsstatic Calculator[]
Calculators used when the first operand is a duration and the second is numericstatic Calculator[]
static Calculator[]
Calculators used when the first operand is a floatstatic Calculator[]
static Calculator[]
static final int
static Calculator[]
static Calculator[]
Calculators used when the first operand is an integerstatic Calculator[]
static Calculator[]
static final int
static final int
static Calculator[]
Calculators used when the second operand is a duration and the first is numericstatic final int
static final int
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionabstract AtomicValue
compute
(AtomicValue a, AtomicValue b, XPathContext c) Perform an arithmetic operationstatic Calculator
getCalculator
(int typeA, int typeB, int operator, boolean mustResolve) Factory method to get a calculator for a given combination of typesstatic String
getCalculatorSetName
(int typeA, int typeB) Get the name of the calculator set for a given combination of typesabstract AtomicType
getResultType
(AtomicType typeA, AtomicType typeB) Get the type of the result of the calculator, given arguments types typeA and typeB
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Field Details
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PLUS
public static final int PLUS- See Also:
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MINUS
public static final int MINUS- See Also:
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TIMES
public static final int TIMES- See Also:
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DIV
public static final int DIV- See Also:
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MOD
public static final int MOD- See Also:
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IDIV
public static final int IDIV- See Also:
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ANY_ANY
Calculators used for the six operators when the static type information does not allow a more specific calculator to be chosen -
DOUBLE_DOUBLE
Calculators used when the first operand is a double -
DOUBLE_FLOAT
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DOUBLE_DECIMAL
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DOUBLE_INTEGER
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FLOAT_DOUBLE
Calculators used when the first operand is a float -
FLOAT_FLOAT
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FLOAT_DECIMAL
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FLOAT_INTEGER
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DECIMAL_DOUBLE
Calculators used when the first operand is a decimal -
DECIMAL_FLOAT
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DECIMAL_DECIMAL
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DECIMAL_INTEGER
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INTEGER_DOUBLE
Calculators used when the first operand is an integer -
INTEGER_FLOAT
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INTEGER_DECIMAL
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INTEGER_INTEGER
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DATETIME_DATETIME
Calculators used when both operands are xs:dateTime, xs:date, or xs:time -
DATETIME_DURATION
Calculators used when the first operand is xs:dateTime, xs:date, or xs:time, and the second is a duration -
DURATION_DATETIME
Calculators used when the second operand is xs:dateTime, xs:date, or xs:time, and the first is a duration -
DURATION_DURATION
Calculators used when the both operands are durations -
DURATION_NUMERIC
Calculators used when the first operand is a duration and the second is numeric -
NUMERIC_DURATION
Calculators used when the second operand is a duration and the first is numeric
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Constructor Details
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Calculator
public Calculator()
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Method Details
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getCalculator
Factory method to get a calculator for a given combination of types- Parameters:
typeA
- fingerprint of the primitive type of the first operandtypeB
- fingerprint of the primitive type of the second operandoperator
- the arithmetic operator in usemustResolve
- indicates that a concrete Calculator is required (rather than an ANY_ANY calculator which needs to be further resolved at run-time)- Returns:
- null if no suitable Calculator can be found.
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getCalculatorSetName
Get the name of the calculator set for a given combination of types- Parameters:
typeA
- the fingerprint of the primitive type of the first operandtypeB
- the fingerprint of the primitive type of the second operand- Returns:
- null if no suitable Calculator can be found.
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compute
public abstract AtomicValue compute(AtomicValue a, AtomicValue b, XPathContext c) throws XPathException Perform an arithmetic operation- Parameters:
a
- the first operand. Must not be null, and must be an instance of the type implied by the class name.b
- the second operand. Must not be null, and must be an instance of the type implied by the class name.c
- the XPath dynamic evaluation context- Returns:
- the result of the computation, as a value of the correct primitive type
- Throws:
XPathException
- in the event of an arithmetic error
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getResultType
Get the type of the result of the calculator, given arguments types typeA and typeB- Parameters:
typeA
- the type of the first operandtypeB
- the type of the second operand- Returns:
- the type of the result
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