Class RelativeNumericProperty

java.lang.Object

org.apache.fop.fo.properties.Property

org.apache.fop.fo.expr.RelativeNumericProperty

All Implemented Interfaces:

Length, Numeric

public class RelativeNumericProperty
extends Property
implements Length

This class represent a node in a property expression tree. It is created when an operation involve relative expression and is used to delay evaluation of the operation until the time where getNumericValue() or getValue() is called.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ABS	ABS
static final int	ADDITION	ADDITION
private int	dimension	The dimension of the result.
static final int	DIVIDE	DIVIDE
static final int	MAX	MAX
static final int	MIN	MIN
static final int	MODULO	MODULO
static final int	MULTIPLY	MULTIPLY
static final int	NEGATE	NEGATE
private Numeric	op1	The first (or only) operand.
private Numeric	op2	The second operand.
private int	operation	The operation identifier.
private static String	operations
static final int	SUBTRACTION	SUBTRACTION

Fields inherited from class Property

log

Constructor Summary

Constructors

Constructor	Description
RelativeNumericProperty(int operation, Numeric op)	Constructor for a one argument operation.
RelativeNumericProperty(int operation, Numeric op1, Numeric op2)	Constructor for a two argument operation.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
int	getDimension()	Return the dimension of the expression
Length	getLength()	Cast this numeric as a Length.
Numeric	getNumeric()	This method expects to be overridden by subclasses
double	getNumericValue()	Return the resolved (calculated) value of the expression.
double	getNumericValue(PercentBaseContext context)	Return the value of this Numeric
private Numeric	getResolved(PercentBaseContext context)	Return a resolved (calculated) Numeric with the value of the expression.
double	getTableUnits()	Return the number of table units which are included in this length specification.
int	getValue()	Returns the length in 1/1000ths of a point (millipoints)
int	getValue(PercentBaseContext context)	Returns the length in 1/1000ths of a point (millipoints)
int	hashCode()
boolean	isAbsolute()	Return false since an expression is only created when there is relative numerics involved.
String	toString()	Return a string represention of the expression.

Methods inherited from class Property

getCharacter, getColor, getCondLength, getEnum, getKeep, getLengthPair, getLengthRange, getList, getNCname, getNumber, getObject, getSpace, getSpecifiedValue, getString, isAuto, setSpecifiedValue

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Numeric

getEnum

Field Details

ADDITION

public static final int ADDITION

ADDITION

See Also:

• Constant Field Values

SUBTRACTION

public static final int SUBTRACTION

SUBTRACTION

See Also:

• Constant Field Values

MULTIPLY

public static final int MULTIPLY

MULTIPLY

See Also:

• Constant Field Values

DIVIDE

public static final int DIVIDE

DIVIDE

See Also:

• Constant Field Values

MODULO

public static final int MODULO

MODULO

See Also:

• Constant Field Values

NEGATE

public static final int NEGATE

NEGATE

See Also:

• Constant Field Values

ABS

public static final int ABS

ABS

See Also:

• Constant Field Values

MAX

public static final int MAX

MAX

See Also:

• Constant Field Values

MIN

public static final int MIN

MIN

See Also:

• Constant Field Values

operations

private static String operations

operation

private int operation

The operation identifier.

op1

private Numeric op1

The first (or only) operand.

op2

private Numeric op2

The second operand.

dimension

private int dimension

The dimension of the result.

Constructor Details

RelativeNumericProperty

public RelativeNumericProperty(int operation,
 Numeric op1,
 Numeric op2)

Constructor for a two argument operation.

Parameters:

operation - the operation opcode: ADDITION, SUBTRACTION, ...

op1 - the first operand.

op2 - the second operand

RelativeNumericProperty

public RelativeNumericProperty(int operation,
 Numeric op)

Constructor for a one argument operation.

Parameters:

operation - the operation opcode: NEGATE, ABS

op - the operand.

Method Details

getResolved

private Numeric getResolved(PercentBaseContext context)
                     throws PropertyException

Return a resolved (calculated) Numeric with the value of the expression.

Parameters:

context - Evaluation context

Returns:

the resolved Numeric corresponding to the value of the expression

Throws:

PropertyException - when an exception occur during evaluation.

getNumericValue

public double getNumericValue()

Return the resolved (calculated) value of the expression. Return the value of this Numeric

Specified by:

getNumericValue in interface Numeric

Returns:

the computed value.

getNumericValue

public double getNumericValue(PercentBaseContext context)

Return the value of this Numeric

Specified by:

getNumericValue in interface Numeric

Parameters:

context - The context for the length calculation (for percentage based lengths)

Returns:

the computed value.

getDimension

public int getDimension()

Return the dimension of the expression

Specified by:

getDimension in interface Numeric

Returns:

numeric value as dimension

isAbsolute

public boolean isAbsolute()

Return false since an expression is only created when there is relative numerics involved.

Specified by:

isAbsolute in interface Numeric

Returns:

true if expression is absolute

getLength

public Length getLength()

Cast this numeric as a Length.

Overrides:

getLength in class Property

Returns:

numeric value as length

getNumeric

public Numeric getNumeric()

Description copied from class: Property

This method expects to be overridden by subclasses

Overrides:

getNumeric in class Property

Returns:

numeric value

getValue

public int getValue()

Returns the length in 1/1000ths of a point (millipoints)

Specified by:

getValue in interface Length

Specified by:

getValue in interface Numeric

Returns:

the length in millipoints

getValue

public int getValue(PercentBaseContext context)

Returns the length in 1/1000ths of a point (millipoints)

Specified by:

getValue in interface Length

Specified by:

getValue in interface Numeric

Parameters:

context - The context for the length calculation (for percentage based lengths)

Returns:

the length in millipoints

getTableUnits

public double getTableUnits()

Return the number of table units which are included in this length specification. This will always be 0 unless the property specification used the proportional-column-width() function (only on table column FOs).

If this value is not 0, the actual value of the Length cannot be known without looking at all of the columns in the table to determine the value of a "table-unit".

Returns:

The number of table units which are included in this length specification.

toString

public String toString()

Return a string represention of the expression. Only used for debugging.

Overrides:

toString in class Property

Returns:

the string representation.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object