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package com.mapbox.mapboxsdk.style.functions.stops;
import android.support.annotation.NonNull;
import android.support.annotation.Size;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Map;
/**
* The {@link Stops} implementation for exponential functions
*
* @param <I> the input type
* @param <O> the output type
*/
public class ExponentialStops<I, O> extends IterableStops<I, O, Stop<I, O>> {
private float base;
private final Stop<I, O>[] stops;
/**
* Create exponential stops with an explicit base. Use through {@link Stops#exponential(Stop[])}
*
* @param base The exponential base of the interpolation curve. It controls the rate at which the function output
* increases. Higher values make the output increase more towards the high end of the range.
* With values close to 1 the output increases linearly.
* @param stops the stops
*/
@SafeVarargs
public ExponentialStops(Float base, @NonNull @Size(min = 1) Stop<I, O>... stops) {
this.base = base != null ? base : 1.0f;
this.stops = stops;
}
/**
* Create exponential stops without an explicit base. Use through {@link Stops#exponential(Stop[])}
*
* @param stops the stops
*/
@SafeVarargs
public ExponentialStops(@NonNull @Size(min = 1) Stop<I, O>... stops) {
this(null, stops);
}
/**
* Set the exponential base
*
* @param base the base to use in the exponential function
* @return this (for chaining)
*/
public ExponentialStops<I, O> withBase(float base) {
this.base = base;
return this;
}
/**
* @return The exponential base
*/
public float getBase() {
return base;
}
/**
* {@inheritDoc}
*/
@Override
public Map<String, Object> toValueObject() {
Map<String, Object> map = super.toValueObject();
map.put("base", base);
map.put("stops", toValueObjects(stops));
return map;
}
/**
* {@inheritDoc}
*/
@Override
public String getTypeName() {
return "exponential";
}
/**
* {@inheritDoc}
*/
@Override
public Iterator<Stop<I, O>> iterator() {
return Arrays.asList(stops).iterator();
}
/**
* {@inheritDoc}
*/
@Override
public int size() {
return stops.length;
}
}
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