org.geotools.mbstyle.expression

Class MBLookup

Object

ExpressionAbstract

FunctionImpl

MBExpression

MBLookup

All Implemented Interfaces:

Expression, Function

public class MBLookup
extends MBExpression

Field Summary

Fields inherited from class MBExpression

colors, decisions, featureData, ff, heatMap, json, lookUp, math, name, parse, ramps, string, transformer, types, variableBindings, zoom

Fields inherited from class FunctionImpl

functionName

Fields inherited from interface Expression

NIL

Constructor Summary

Constructors

Constructor and Description
MBLookup(JSONArray json)

Method Summary

Modifier and Type	Method and Description
Expression	getExpression() Determines which expression to use.
Expression	lookupAt() Retrieves an item from an array.
Expression	lookupGet() Retrieves a property value from the current feature's properties, or from another object if a second argument is provided.
Expression	lookupHas() Tests for the presence of an property value in the current feature's properties, or from another object if a second argument is provided.
Expression	lookupLength() Gets the length of an array or string.

Methods inherited from class MBExpression

canCreate, create, getName, throwInsufficientArgumentCount, throwUnexpectedArgumentCount, transformExpression, transformLiteral

Methods inherited from class FunctionImpl

accept, dispatchArguments, equals, evaluate, functionName, getFallbackValue, getFunctionName, getParameters, getParameterValue, getParameterValue, hashCode, setFallbackValue, setName, setParameters, toString

Methods inherited from class ExpressionAbstract

evaluate

Methods inherited from class Object

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

Methods inherited from interface Expression

evaluate

Constructor Detail

MBLookup

public MBLookup(JSONArray json)

Method Detail

lookupAt

public Expression lookupAt()

Retrieves an item from an array. Example: ["at", number, array]: ItemType

Returns:

lookup array element expression

lookupGet

public Expression lookupGet()

Retrieves a property value from the current feature's properties, or from another object if a second argument is provided. Returns null if the requested property is missing. Example: ["get", string]: value ["get", string, object]: value

As a note, the mbstyle requires json objects for lookup, and evaluates the object as such.

Returns:

lookup map property by bame expression

lookupHas

public Expression lookupHas()

Tests for the presence of an property value in the current feature's properties, or from another object if a second argument is provided. Example: ["has", string]: boolean ["has", string, object]: boolean

As a note, the mbstyle requires json objects for lookup, and evaluates the object as such.

Returns:

check of properties contains key expression

lookupLength

public Expression lookupLength()

Gets the length of an array or string. Example: ["length", string]: number ["length", array]: number

Returns:

length of array expression

getExpression

public Expression getExpression()
                         throws MBFormatException

Description copied from class: MBExpression

Determines which expression to use.

Specified by:

getExpression in class MBExpression

Throws:

MBFormatException