1 files changed, 84 insertions, 0 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/functions/SourceFunction.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/functions/SourceFunction.java
new file mode 100644
index 0000000000..f0eed760a4
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/functions/SourceFunction.java
@@ -0,0 +1,84 @@
+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 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 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;
+  }
+
+
+  /**
+   * 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(O defaultValue) {
+    this.defaultValue = defaultValue;
+    return this;
+  }
+
+  /**
+   * @return the defaultValue
+   */
+  @Nullable
+  public 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);
+    }
+    return valueObject;
+  }
+}