[android] use PropertyValue for default values in functions

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/functions/CompositeFunction.java

@@ -8,6 +8,7 @@ import com.mapbox.mapboxsdk.style.functions.stops.ExponentialStops;
 import com.mapbox.mapboxsdk.style.functions.stops.IntervalStops;
 import com.mapbox.mapboxsdk.style.functions.stops.Stop;
 import com.mapbox.mapboxsdk.style.functions.stops.Stops;
+import com.mapbox.mapboxsdk.style.layers.PropertyValue;
 
 import java.util.Map;
 
@@ -27,7 +28,7 @@ import java.util.Map;
 public class CompositeFunction<Z extends Number, I, O> extends Function<Stop.CompositeValue<Z, I>, O> {
 
   private final String property;
-  private O defaultValue;
+  private PropertyValue<O> defaultValue;
 
   CompositeFunction(@NonNull String property,
                     @NonNull CategoricalStops<Stop.CompositeValue<Z, I>, O> stops) {
@@ -51,7 +52,7 @@ public class CompositeFunction<Z extends Number, I, O> extends Function<Stop.Com
   private CompositeFunction(@Nullable O defaultValue, @NonNull String property,
                             @NonNull Stops<Stop.CompositeValue<Z, I>, O> stops) {
     super(stops);
-    this.defaultValue = defaultValue;
+    this.defaultValue = new PropertyValue<>(property, defaultValue);
     this.property = property;
   }
 
@@ -61,7 +62,7 @@ public class CompositeFunction<Z extends Number, I, O> extends Function<Stop.Com
    * @param defaultValue the default value to use when no other applies
    * @return this (for chaining)
    */
-  public CompositeFunction<Z, I, O> withDefaultValue(O defaultValue) {
+  public CompositeFunction<Z, I, O> withDefaultValue(PropertyValue<O> defaultValue) {
     this.defaultValue = defaultValue;
     return this;
   }
@@ -70,7 +71,7 @@ public class CompositeFunction<Z extends Number, I, O> extends Function<Stop.Com
    * @return the defaultValue
    */
   @Nullable
-  public O getDefaultValue() {
+  public PropertyValue<O> getDefaultValue() {
     return defaultValue;
   }
 
@@ -91,7 +92,7 @@ public class CompositeFunction<Z extends Number, I, O> extends Function<Stop.Com
     Map<String, Object> valueObject = super.toValueObject();
     valueObject.put(PROPERTY_KEY, property);
     if (defaultValue != null) {
-      valueObject.put(DEFAULT_VALUE_KEY, defaultValue);
+      valueObject.put(DEFAULT_VALUE_KEY, defaultValue.value);
     }
     return valueObject;
   }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/functions/SourceFunction.java

@@ -4,6 +4,7 @@ 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;
 
@@ -25,7 +26,7 @@ import java.util.Map;
 public class SourceFunction<I, O> extends Function<I, O> {
 
   private final String property;
-  private O defaultValue;
+  private PropertyValue<O> defaultValue;
 
   SourceFunction(@NonNull String property, @NonNull Stops<I, O> stops) {
     this(null, property, stops);
@@ -37,7 +38,7 @@ public class SourceFunction<I, O> extends Function<I, O> {
   private SourceFunction(@Nullable O defaultValue, @NonNull String property, @NonNull Stops<I, O> stops) {
     super(stops);
     this.property = property;
-    this.defaultValue = defaultValue;
+    this.defaultValue = defaultValue != null ? new PropertyValue<>(property, defaultValue) : null;
   }
 
 
@@ -56,7 +57,7 @@ public class SourceFunction<I, O> extends Function<I, O> {
    * @param defaultValue the default value to use when no other applies
    * @return this (for chaining)
    */
-  public SourceFunction<I, O> withDefaultValue(O defaultValue) {
+  public SourceFunction<I, O> withDefaultValue(PropertyValue<O> defaultValue) {
     this.defaultValue = defaultValue;
     return this;
   }
@@ -65,7 +66,7 @@ public class SourceFunction<I, O> extends Function<I, O> {
    * @return the defaultValue
    */
   @Nullable
-  public O getDefaultValue() {
+  public PropertyValue<O> getDefaultValue() {
     return defaultValue;
   }
 
@@ -77,7 +78,7 @@ public class SourceFunction<I, O> extends Function<I, O> {
     Map<String, Object> valueObject = super.toValueObject();
     valueObject.put(PROPERTY_KEY, property);
     if (defaultValue != null) {
-      valueObject.put(DEFAULT_VALUE_KEY, defaultValue);
+      valueObject.put(DEFAULT_VALUE_KEY, defaultValue.value);
     }
     return valueObject;
   }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/PropertyValue.java

@@ -1,9 +1,12 @@
 package com.mapbox.mapboxsdk.style.layers;
 
+import android.support.annotation.ColorInt;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
+import com.mapbox.mapboxsdk.exceptions.ConversionException;
 import com.mapbox.mapboxsdk.style.functions.Function;
+import com.mapbox.mapboxsdk.utils.ColorUtils;
 
 import timber.log.Timber;
 
@@ -15,7 +18,14 @@ public class PropertyValue<T> {
   public final String name;
   public final T value;
 
-  /* package */ PropertyValue(@NonNull String name, T value) {
+  /**
+   * Not part of the public API.
+   *
+   * @param name  the property name
+   * @param value the property value
+   * @see PropertyFactory for construction of {@link PropertyValue}s
+   */
+  public PropertyValue(@NonNull String name, T value) {
     this.name = name;
     this.value = value;
   }
@@ -54,6 +64,22 @@ public class PropertyValue<T> {
     }
   }
 
+  @ColorInt
+  @Nullable
+  public Integer getColorInt() {
+    if (!isValue() || !(value instanceof String)) {
+      Timber.e("%s is not a String value and can not be converted to a color it", name);
+      return null;
+    }
+
+    try {
+      return ColorUtils.rgbaToColor((String) value);
+    } catch (ConversionException ex) {
+      Timber.e("%s could not be converted to a Color int: %s", name, ex.getMessage());
+      return null;
+    }
+  }
+
   @Override
   public String toString() {
     return String.format("%s: %s", name, value);