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package com.mapbox.mapboxsdk.style.functions;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import com.mapbox.mapboxsdk.style.functions.stops.Stops;
import com.mapbox.mapboxsdk.style.layers.PropertyValue;
import java.util.Map;
/**
* Source functions take Feature property names as input.
* <p>
* Source functions allow the appearance of a map feature to change with
* its properties. Source functions can be used to visually differentiate
* types of features within the same layer or create data visualizations.
* Each stop is an array with two elements, the first is a property input
* value and the second is a function output value. Note that support for
* property functions is not available across all properties and platforms
* at this time.
*
* @param <I> the input type
* @param <O> the output type
* @see Function#property
*/
public class SourceFunction<I, O> extends Function<I, O> {
private final String property;
private PropertyValue<O> defaultValue;
SourceFunction(@NonNull String property, @NonNull Stops<I, O> stops) {
this(null, property, stops);
}
/**
* JNI Constructor
*/
private SourceFunction(@Nullable O defaultValue, @NonNull String property, @NonNull Stops<I, O> stops) {
super(stops);
this.property = property;
this.defaultValue = defaultValue != null ? new PropertyValue<>(property, defaultValue) : null;
}
/**
* INTERNAL USAGE ONLY
*
* @return The feature property name
*/
public String getProperty() {
return property;
}
/**
* Set the default value
*
* @param defaultValue the default value to use when no other applies
* @return this (for chaining)
*/
public SourceFunction<I, O> withDefaultValue(PropertyValue<O> defaultValue) {
this.defaultValue = defaultValue;
return this;
}
/**
* @return the defaultValue
*/
@Nullable
public PropertyValue<O> getDefaultValue() {
return defaultValue;
}
/**
* {@inheritDoc}
*/
@Override
public Map<String, Object> toValueObject() {
Map<String, Object> valueObject = super.toValueObject();
valueObject.put(PROPERTY_KEY, property);
if (defaultValue != null) {
valueObject.put(DEFAULT_VALUE_KEY, defaultValue.value);
}
return valueObject;
}
}
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