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package com.mapbox.mapboxsdk.style.sources;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.UiThread;
import android.support.annotation.WorkerThread;
import com.mapbox.mapboxsdk.geometry.LatLngBounds;
import com.mapbox.mapboxsdk.style.layers.Filter;
import com.mapbox.services.commons.geojson.Feature;
import com.mapbox.services.commons.geojson.FeatureCollection;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Custom Vector Source, allows using FeatureCollections.
*
*/
@UiThread
public class CustomGeometrySource extends Source {
private ExecutorService executor;
private GeometryTileProvider provider;
private final Map<TileID, AtomicBoolean> cancelledTileRequests = new ConcurrentHashMap<>();
/**
* Create a CustomGeometrySource
*
* @param id The source id.
* @param provider The tile provider that returns geometry data for this source.
*/
public CustomGeometrySource(String id, GeometryTileProvider provider) {
this(id, provider, new GeoJsonOptions());
}
/**
* Create a CustomGeometrySource with non-default GeoJsonOptions.
* <p>Supported options are minZoom, maxZoom, buffer, and tolerance.</p>
*
* @param id The source id.
* @param provider The tile provider that returns geometry data for this source.
* @param options GeoJsonOptions.
*/
public CustomGeometrySource(String id, GeometryTileProvider provider, GeoJsonOptions options) {
this.provider = provider;
executor = Executors.newFixedThreadPool(4);
initialize(this, id, options);
}
/**
* Invalidate previously provided features within a given bounds at all zoom levels.
* Invoking this method will result in new requests to `GeometryTileProvider` for regions
* that contain, include, or intersect with the provided bounds.
*
* @param bounds The region in which features should be invalidated at all zoom levels
*/
public void invalidateRegion(LatLngBounds bounds) {
nativeInvalidateBounds(bounds);
}
/**
* Invalidate the geometry contents of a specific tile. Invoking this method will result
* in new requests to `GeometryTileProvider` for visible tiles.
*
* @param zoomLevel Tile zoom level.
* @param x Tile X coordinate.
* @param y Tile Y coordinate.
*/
public void invalidateTile(int zoomLevel, int x, int y) {
nativeInvalidateTile(zoomLevel, x, y);
}
/**
* Set or update geometry contents of a specific tile. Use this method to update tiles
* for which `GeometryTileProvider` was previously invoked. This method can be called from
* background threads.
*
* @param zoomLevel Tile zoom level.
* @param x Tile X coordinate.
* @param y Tile Y coordinate.
* @param data Feature collection for the tile.
*/
public void setTileData(int zoomLevel, int x, int y, FeatureCollection data) {
nativeSetTileData(zoomLevel, x, y, data);
}
/**
* Queries the source for features.
*
* @param filter an optional filter statement to filter the returned Features
* @return the features
*/
@NonNull
public List<Feature> querySourceFeatures(@Nullable Filter.Statement filter) {
Feature[] features = querySourceFeatures(filter != null ? filter.toArray() : null);
return features != null ? Arrays.asList(features) : new ArrayList<Feature>();
}
protected native void initialize(CustomGeometrySource self, String sourceId, Object options);
private native Feature[] querySourceFeatures(Object[] filter);
private native void nativeSetTileData(int z, int x, int y, FeatureCollection data);
private native void nativeInvalidateTile(int z, int x, int y);
private native void nativeInvalidateBounds(LatLngBounds bounds);
@Override
protected native void finalize() throws Throwable;
private void setTileData(TileID tileId, FeatureCollection data) {
cancelledTileRequests.remove(tileId);
nativeSetTileData(tileId.z, tileId.x, tileId.y, data);
}
@WorkerThread
private void fetchTile(int z, int x, int y) {
AtomicBoolean cancelFlag = new AtomicBoolean(false);
TileID tileID = new TileID(z, x, y);
cancelledTileRequests.put(tileID, cancelFlag);
GeometryTileRequest request = new GeometryTileRequest(tileID, provider, this, cancelFlag);
executor.submit(request);
}
@WorkerThread
private void cancelTile(int z, int x, int y) {
AtomicBoolean cancelFlag = cancelledTileRequests.get(new TileID(z, x, y));
if (cancelFlag != null) {
cancelFlag.compareAndSet(false, true);
}
}
private static class TileID {
public int z;
public int x;
public int y;
public TileID(int _z, int _x, int _y) {
z = _z;
x = _x;
y = _y;
}
public int hashCode() {
return Arrays.hashCode(new int[]{z, x, y});
}
public boolean equals(Object object) {
if (object == this) {
return true;
}
if (object == null || getClass() != object.getClass()) {
return false;
}
if (object instanceof TileID) {
TileID other = (TileID)object;
return this.z == other.z && this.x == other.x && this.y == other.y;
}
return false;
}
}
private static class GeometryTileRequest implements Runnable {
private TileID id;
private GeometryTileProvider provider;
private WeakReference<CustomGeometrySource> sourceRef;
private AtomicBoolean cancelled;
public GeometryTileRequest(TileID _id, GeometryTileProvider p,
CustomGeometrySource _source, AtomicBoolean _cancelled) {
id = _id;
provider = p;
sourceRef = new WeakReference<>(_source);
cancelled = _cancelled;
}
public void run() {
if (isCancelled()) {
return;
}
FeatureCollection data = provider.getFeaturesForBounds(LatLngBounds.from(id.z, id.x, id.y), id.z);
CustomGeometrySource source = sourceRef.get();
if (!isCancelled() && source != null && !data.getFeatures().isEmpty()) {
source.setTileData(id, data);
}
}
private Boolean isCancelled() {
return cancelled.get();
}
}
}
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