org.apache.fop.traits

Class MinOptMax

java.lang.Object

org.apache.fop.traits.MinOptMax

All Implemented Interfaces:

Serializable

public final class MinOptMax
extends Object
implements Serializable

This class holds the resolved (as mpoints) form of a LengthRange or Space type property value.

Instances of this class are immutable. All arithmetic methods like plus, minus or mult return a different instance. So it is possible to pass around instances without copying.

MinOptMax values are used during layout calculations.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static MinOptMax	ZERO The zero MinOptMax instance with min == opt == max == 0.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
MinOptMax	extendMinimum(int newMin) Extends the minimum length to the given length if necessary, and adjusts opt and max accordingly.
static MinOptMax	getInstance(int value) Returns an instance of MinOptMax with one fixed value for all three properties (min, opt, max).
static MinOptMax	getInstance(int min, int opt, int max) Returns an instance of MinOptMax with the given values.
int	getMax() Returns the maximum value of this MinOptMax.
int	getMin() Returns the minimum value of this MinOptMax.
int	getOpt() Returns the optimum value of this MinOptMax.
int	getShrink() Returns the shrinkability of this MinOptMax which is the absolute difference between min and opt.
int	getStretch() Returns the stretchability of this MinOptMax which is the absolute difference between opt and max.
int	hashCode()
boolean	isElastic() Determines whether this MinOptMax allows for shrinking or stretching, which means that at least one of the min or max values isn't equal to the opt value.
boolean	isNonZero() Determines whether this MinOptMax represents a non-zero dimension, which means that not all values (min, opt, max) are zero.
boolean	isStiff() Determines whether this MinOptMax doesn't allow for shrinking or stretching, which means that all values (min, opt, max) are the same.
MinOptMax	minus(int value) Subtracts the given value from all three components of this instance and returns the result.
MinOptMax	minus(MinOptMax operand) Returns the difference of this MinOptMax and the given MinOptMax.
MinOptMax	minusMax(int maxOperand) Do not use, backwards compatibility only.
MinOptMax	minusMin(int minOperand) Do not use, backwards compatibility only.
MinOptMax	mult(int factor) Returns the product of this MinOptMax and the given factor.
MinOptMax	plus(int value) Adds the given value to all three components of this instance and returns the result.
MinOptMax	plus(MinOptMax operand) Returns the sum of this MinOptMax and the given MinOptMax.
MinOptMax	plusMax(int maxOperand) Do not use, backwards compatibility only.
MinOptMax	plusMin(int minOperand) Do not use, backwards compatibility only.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

ZERO

public static final MinOptMax ZERO

The zero MinOptMax instance with min == opt == max == 0.

Method Detail

getInstance

public static MinOptMax getInstance(int min,
                                    int opt,
                                    int max)
                             throws IllegalArgumentException

Returns an instance of MinOptMax with the given values.

Parameters:

min - the minimum value

opt - the optimum value

max - the maximum value

Returns:

the corresponding instance

Throws:

IllegalArgumentException - if min > opt || max < opt.

getInstance

public static MinOptMax getInstance(int value)

Returns an instance of MinOptMax with one fixed value for all three properties (min, opt, max).

Parameters:

value - the value for min, opt and max

Returns:

the corresponding instance

See Also:

isStiff()

getMin

public int getMin()

Returns the minimum value of this MinOptMax.

Returns:

the minimum value of this MinOptMax.

getOpt

public int getOpt()

Returns the optimum value of this MinOptMax.

Returns:

the optimum value of this MinOptMax.

getMax

public int getMax()

Returns the maximum value of this MinOptMax.

Returns:

the maximum value of this MinOptMax.

getShrink

public int getShrink()

Returns the shrinkability of this MinOptMax which is the absolute difference between min and opt.

Returns:

the shrinkability of this MinOptMax which is always non-negative.

getStretch

public int getStretch()

Returns the stretchability of this MinOptMax which is the absolute difference between opt and max.

Returns:

the stretchability of this MinOptMax which is always non-negative.

plus

public MinOptMax plus(MinOptMax operand)

Returns the sum of this MinOptMax and the given MinOptMax.

Parameters:

operand - the second operand of the sum (the first is this instance itself),

Returns:

the sum of this MinOptMax and the given MinOptMax.

plus

public MinOptMax plus(int value)

Adds the given value to all three components of this instance and returns the result.

Parameters:

value - value to add to the min, opt, max components

Returns:

the result of the addition

minus

public MinOptMax minus(MinOptMax operand)
                throws ArithmeticException

Returns the difference of this MinOptMax and the given MinOptMax. This instance must be a compound of the operand and another MinOptMax, that is, there must exist a MinOptMax m such that this.equals(m.plus(operand)). In other words, the operand must have less shrink and stretch than this instance.

Parameters:

operand - the value to be subtracted

Returns:

the difference of this MinOptMax and the given MinOptMax.

Throws:

ArithmeticException - if this instance has strictly less shrink or stretch than the operand

minus

public MinOptMax minus(int value)

Subtracts the given value from all three components of this instance and returns the result.

Parameters:

value - value to subtract from the min, opt, max components

Returns:

the result of the subtraction

plusMin

public MinOptMax plusMin(int minOperand)
                  throws IllegalArgumentException

Do not use, backwards compatibility only. Returns an instance with the given value added to the minimal value.

Parameters:

minOperand - the minimal value to be added.

Returns:

an instance with the given value added to the minimal value.

Throws:

IllegalArgumentException - if min + minOperand > opt || max < opt.

minusMin

public MinOptMax minusMin(int minOperand)
                   throws IllegalArgumentException

Do not use, backwards compatibility only. Returns an instance with the given value subtracted to the minimal value.

Parameters:

minOperand - the minimal value to be subtracted.

Returns:

an instance with the given value subtracted to the minimal value.

Throws:

IllegalArgumentException - if min - minOperand > opt || max < opt.

plusMax

public MinOptMax plusMax(int maxOperand)
                  throws IllegalArgumentException

Do not use, backwards compatibility only. Returns an instance with the given value added to the maximal value.

Parameters:

maxOperand - the maximal value to be added.

Returns:

an instance with the given value added to the maximal value.

Throws:

IllegalArgumentException - if min > opt || max < opt + maxOperand.

minusMax

public MinOptMax minusMax(int maxOperand)
                   throws IllegalArgumentException

Do not use, backwards compatibility only. Returns an instance with the given value subtracted to the maximal value.

Parameters:

maxOperand - the maximal value to be subtracted.

Returns:

an instance with the given value subtracted to the maximal value.

Throws:

IllegalArgumentException - if min > opt || max < opt - maxOperand.

mult

public MinOptMax mult(int factor)
               throws IllegalArgumentException

Returns the product of this MinOptMax and the given factor.

Parameters:

factor - the factor

Returns:

the product of this MinOptMax and the given factor

Throws:

IllegalArgumentException - if the factor is negative

isNonZero

public boolean isNonZero()

Determines whether this MinOptMax represents a non-zero dimension, which means that not all values (min, opt, max) are zero.

Returns:

true if this MinOptMax represents a non-zero dimension; false otherwise.

isStiff

public boolean isStiff()

Determines whether this MinOptMax doesn't allow for shrinking or stretching, which means that all values (min, opt, max) are the same.

Returns:

true if whether this MinOptMax doesn't allow for shrinking or stretching; false otherwise.

See Also:

isElastic()

isElastic

public boolean isElastic()

Determines whether this MinOptMax allows for shrinking or stretching, which means that at least one of the min or max values isn't equal to the opt value.

Returns:

true if this MinOptMax allows for shrinking or stretching; false otherwise.

See Also:

isStiff()

extendMinimum

public MinOptMax extendMinimum(int newMin)

Extends the minimum length to the given length if necessary, and adjusts opt and max accordingly.

Parameters:

newMin - the new minimum length

Returns:

a MinOptMax instance with the minimum length extended

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object