org.openstreetmap.josm.gui.mappaint

Class DividedScale<T>

java.lang.Object

org.openstreetmap.josm.gui.mappaint.DividedScale<T>

Type Parameters:

T - the type of the data objects

public class DividedScale<T>
extends java.lang.Object

Splits the range of possible scale values (0 < scale < +Infinity) into multiple subranges, for each scale range it keeps a data object of a certain type T (can be null). Used for caching style information for different zoom levels. Immutable class, equals & hashCode is required (the same for StyleElementList, StyleElement and its subclasses).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DividedScale.RangeViolatedError This exception type is for debugging #8997 and can later be replaced by AssertionError

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.List<java.lang.Double>	bd
private java.util.List<T>	data

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DividedScale()
protected	DividedScale(DividedScale<T> s)

Method Summary

Modifier and Type	Method and Description
void	consistencyTest() Runs a consistency test.
boolean	equals(java.lang.Object obj)
T	get(double scale) Looks up the data object for a certain scale value.
Pair<T,Range>	getWithRange(double scale) Looks up the data object for a certain scale value and additionally returns the scale range where the object is valid.
int	hashCode()
DividedScale<T>	put(T o, Range r) Add data object which is valid for the given range.
private void	putImpl(T o, double lower, double upper) Implementation of the put operation.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

bd

private final java.util.List<java.lang.Double> bd

data

private final java.util.List<T> data

Constructor Detail

DividedScale

protected DividedScale()

DividedScale

protected DividedScale(DividedScale<T> s)

Method Detail

get

public T get(double scale)

Looks up the data object for a certain scale value.

Parameters:

scale - scale

Returns:

the data object at the given scale, can be null

getWithRange

public Pair<T,Range> getWithRange(double scale)

Looks up the data object for a certain scale value and additionally returns the scale range where the object is valid.

Parameters:

scale - scale

Returns:

pair containing data object and range

put

public DividedScale<T> put(T o,
                           Range r)

Add data object which is valid for the given range. This is only possible, if there is no data for the given range yet.

Parameters:

o - data object

r - the valid range

Returns:

a new, updated, DividedScale object

putImpl

private void putImpl(T o,
                     double lower,
                     double upper)

Implementation of the put operation. ASCII-art explanation: data[i] --|-------|---------|-- bd[i-1] bd[i] bd[i+1] (--------] lower upper

Parameters:

o - data object

lower - lower bound

upper - upper bound

consistencyTest

public void consistencyTest()

Runs a consistency test.

Throws:

java.lang.AssertionError - When an invariant is broken.

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object