Package net.sf.saxon.expr
Class Calculator
- java.lang.Object
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- net.sf.saxon.expr.Calculator
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- All Implemented Interfaces:
java.io.Serializable
public abstract class Calculator extends java.lang.Object implements java.io.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:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description static Calculator[]
ANY_ANY
Calculators used for the six operators when the static type information does not allow a more specific calculator to be chosenstatic Calculator[]
DATETIME_DATETIME
Calculators used when both operands are xs:dateTime, xs:date, or xs:timestatic Calculator[]
DATETIME_DURATION
Calculators used when the first operand is xs:dateTime, xs:date, or xs:time, and the second is a durationstatic Calculator[]
DECIMAL_DECIMAL
static Calculator[]
DECIMAL_DOUBLE
Calculators used when the first operand is a decimalstatic Calculator[]
DECIMAL_FLOAT
static Calculator[]
DECIMAL_INTEGER
static int
DIV
static Calculator[]
DOUBLE_DECIMAL
static Calculator[]
DOUBLE_DOUBLE
Calculators used when the first operand is a doublestatic Calculator[]
DOUBLE_FLOAT
static Calculator[]
DOUBLE_INTEGER
static Calculator[]
DURATION_DATETIME
Calculators used when the second operand is xs:dateTime, xs:date, or xs:time, and the first is a durationstatic Calculator[]
DURATION_DURATION
Calculators used when the both operands are durationsstatic Calculator[]
DURATION_NUMERIC
Calculators used when the first operand is a duration and the second is numericstatic Calculator[]
FLOAT_DECIMAL
static Calculator[]
FLOAT_DOUBLE
Calculators used when the first operand is a floatstatic Calculator[]
FLOAT_FLOAT
static Calculator[]
FLOAT_INTEGER
static int
IDIV
static Calculator[]
INTEGER_DECIMAL
static Calculator[]
INTEGER_DOUBLE
Calculators used when the first operand is an integerstatic Calculator[]
INTEGER_FLOAT
static Calculator[]
INTEGER_INTEGER
static int
MINUS
static int
MOD
static Calculator[]
NUMERIC_DURATION
Calculators used when the second operand is a duration and the first is numericstatic int
PLUS
static int
TIMES
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Constructor Summary
Constructors Constructor Description Calculator()
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description abstract 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 java.lang.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 Detail
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PLUS
public static final int PLUS
- See Also:
- Constant Field Values
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MINUS
public static final int MINUS
- See Also:
- Constant Field Values
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TIMES
public static final int TIMES
- See Also:
- Constant Field Values
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DIV
public static final int DIV
- See Also:
- Constant Field Values
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MOD
public static final int MOD
- See Also:
- Constant Field Values
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IDIV
public static final int IDIV
- See Also:
- Constant Field Values
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ANY_ANY
public static Calculator[] ANY_ANY
Calculators used for the six operators when the static type information does not allow a more specific calculator to be chosen
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DOUBLE_DOUBLE
public static Calculator[] DOUBLE_DOUBLE
Calculators used when the first operand is a double
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DOUBLE_FLOAT
public static Calculator[] DOUBLE_FLOAT
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DOUBLE_DECIMAL
public static Calculator[] DOUBLE_DECIMAL
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DOUBLE_INTEGER
public static Calculator[] DOUBLE_INTEGER
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FLOAT_DOUBLE
public static Calculator[] FLOAT_DOUBLE
Calculators used when the first operand is a float
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FLOAT_FLOAT
public static Calculator[] FLOAT_FLOAT
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FLOAT_DECIMAL
public static Calculator[] FLOAT_DECIMAL
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FLOAT_INTEGER
public static Calculator[] FLOAT_INTEGER
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DECIMAL_DOUBLE
public static Calculator[] DECIMAL_DOUBLE
Calculators used when the first operand is a decimal
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DECIMAL_FLOAT
public static Calculator[] DECIMAL_FLOAT
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DECIMAL_DECIMAL
public static Calculator[] DECIMAL_DECIMAL
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DECIMAL_INTEGER
public static Calculator[] DECIMAL_INTEGER
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INTEGER_DOUBLE
public static Calculator[] INTEGER_DOUBLE
Calculators used when the first operand is an integer
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INTEGER_FLOAT
public static Calculator[] INTEGER_FLOAT
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INTEGER_DECIMAL
public static Calculator[] INTEGER_DECIMAL
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INTEGER_INTEGER
public static Calculator[] INTEGER_INTEGER
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DATETIME_DATETIME
public static Calculator[] DATETIME_DATETIME
Calculators used when both operands are xs:dateTime, xs:date, or xs:time
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DATETIME_DURATION
public static Calculator[] DATETIME_DURATION
Calculators used when the first operand is xs:dateTime, xs:date, or xs:time, and the second is a duration
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DURATION_DATETIME
public static Calculator[] DURATION_DATETIME
Calculators used when the second operand is xs:dateTime, xs:date, or xs:time, and the first is a duration
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DURATION_DURATION
public static Calculator[] DURATION_DURATION
Calculators used when the both operands are durations
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DURATION_NUMERIC
public static Calculator[] DURATION_NUMERIC
Calculators used when the first operand is a duration and the second is numeric
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NUMERIC_DURATION
public static Calculator[] NUMERIC_DURATION
Calculators used when the second operand is a duration and the first is numeric
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Method Detail
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getCalculator
public static Calculator getCalculator(int typeA, int typeB, int operator, boolean mustResolve)
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
public static java.lang.String getCalculatorSetName(int typeA, int typeB)
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
public abstract AtomicType getResultType(AtomicType typeA, AtomicType typeB)
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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