org.geotools.mbstyle.transform

Class MBStyleTransformer

Object

MBStyleTransformer

public class MBStyleTransformer
extends Object

Responsible for traverse MBStyle and generating StyledLayerDescriptor.

Author:

Jody Garnett (Jody Garnett)

Field Summary

Fields

Modifier and Type	Field and Description
protected static Pattern	mapboxTokenPattern

Constructor Summary

Constructors

Constructor and Description
MBStyleTransformer(MBObjectParser parse)

Method Summary

Modifier and Type	Method and Description
Expression	cqlExpressionFromTokens(String tokenStr) Take a string that may contain Mapbox-style tokens, and convert it to a CQL expression.
String	cqlStringFromTokens(String tokenStr) Take a string that may contain Mapbox-style tokens, and convert it to a CQL expression string.
ExternalGraphic	createExternalGraphicForSprite(Expression iconName, Expression iconSize, MBStyle styleContext) Takes the name of an icon, and an MBStyle as a context, and returns an External Graphic referencing the full URL of the image for consumption by the SpriteGraphicFactory.
ExternalGraphic	createExternalGraphicForSprite(Expression iconName, MBStyle styleContext) Takes the name of an icon, and an MBStyle as a context, and returns an External Graphic referencing the full URL of the image for consumption by the SpriteGraphicFactory.
List<String>	getDefaultFonts()
static <T> T	requireLiteral(Expression expression, Class<T> clazz, T fallback, String propertyName, String layerId) Utility method for getting a concrete value out of an expression, used by transformer methods when GeoTools is unable to accept an expression.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mapboxTokenPattern

protected static final Pattern mapboxTokenPattern

Constructor Detail

MBStyleTransformer

public MBStyleTransformer(MBObjectParser parse)

Method Detail

createExternalGraphicForSprite

public ExternalGraphic createExternalGraphicForSprite(Expression iconName,
                                                      Expression iconSize,
                                                      MBStyle styleContext)

Takes the name of an icon, and an MBStyle as a context, and returns an External Graphic referencing the full URL of the image for consumption by the SpriteGraphicFactory. (The format of the image will be SpriteGraphicFactory.FORMAT).

Parameters:

iconName - The name of the icon inside the spritesheet.

iconSize - The size (scale multiplier) to apply to the icon. (Nullable).

styleContext - The style context in which to resolve the icon name to the full sprite URL (for consumption by the SpriteGraphicFactory).

Returns:

An external graphic with the full URL of the mage for the SpriteGraphicFactory.

See Also:

SpriteGraphicFactory

createExternalGraphicForSprite

public ExternalGraphic createExternalGraphicForSprite(Expression iconName,
                                                      MBStyle styleContext)

Takes the name of an icon, and an MBStyle as a context, and returns an External Graphic referencing the full URL of the image for consumption by the SpriteGraphicFactory. (The format of the image will be SpriteGraphicFactory.FORMAT).

Parameters:

iconName - The name of the icon inside the spritesheet.

styleContext - The style context in which to resolve the icon name to the full sprite URL (for consumption by the SpriteGraphicFactory).

Returns:

An external graphic with the full URL of the mage for the SpriteGraphicFactory.

See Also:

SpriteGraphicFactory

cqlStringFromTokens

public String cqlStringFromTokens(String tokenStr)

Take a string that may contain Mapbox-style tokens, and convert it to a CQL expression string.

E.g., convert "String with {tokens}" to a CQL Expression (String) " String with ${tokens}".

See documentation of Mapbox {token} values, linked below.

Parameters:

tokenStr - A string with mapbox-style tokens

Returns:

A CQL Expression

See Also:

Mapbox Style Spec: {token} values for icon-image, Mapbox Style Spec: {token} values for text-field

cqlExpressionFromTokens

public Expression cqlExpressionFromTokens(String tokenStr)

Take a string that may contain Mapbox-style tokens, and convert it to a CQL expression.

E.g., convert "String with {tokens}" to a CQL Expression: " String with ${tokens}".

See documentation of Mapbox {token} values, linked below.

Parameters:

tokenStr - A string with mapbox-style tokens

Returns:

A CQL Expression

See Also:

Mapbox Style Spec: {token} values for icon-image, Mapbox Style Spec: {token} values for text-field

requireLiteral

public static <T> T requireLiteral(Expression expression,
                                   Class<T> clazz,
                                   T fallback,
                                   String propertyName,
                                   String layerId)

Utility method for getting a concrete value out of an expression, used by transformer methods when GeoTools is unable to accept an expression.

• If the provided Expression is a Literal, evaluates it and returns the value.
• Otherwise, returns the provided fallback value and logs a warning that dynamic styling is not yet supported for this property.

Parameters:

expression - The expression

clazz - The type to provide as the context for the expression's evaluation.

fallback - The value to return if the expression is not a literal

propertyName - The name of the property that the expression corresponds to, for logging purposes.

layerId - The ID of the layer that the expression corresponds to, for logging purposes.

Returns:

The evaluated value of the provided Expression, or the provided fallback value.

getDefaultFonts

public List<String> getDefaultFonts()

Returns:

The list of default font names