Java GeoPoint类代码示例

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
public List<PointData> getPointsWithinRadius(double latitude, double longitude, double radiusInMeter, String... fetchAttributes) {
	GeoPoint centerPoint = new GeoPoint(latitude, longitude);
	
	//System.out.println(latitude + "/" + longitude); //TODO remove DEBUG code
	
	List<String> attributesToGet = new ArrayList<String>();
	attributesToGet.add(config().getRangeKeyAttributeName());
	attributesToGet.add(config().getGeoJsonAttributeName());
	for (String fa : fetchAttributes) {
		attributesToGet.add(fa);
	}

	QueryRadiusRequest queryRadiusRequest = new QueryRadiusRequest(centerPoint, radiusInMeter);
	queryRadiusRequest.getQueryRequest().setAttributesToGet(attributesToGet);
	QueryRadiusResult queryRadiusResult = geoDataManager.queryRadius(queryRadiusRequest);

	List<PointData> result = new LinkedList<PointData>();
	for (Map<String, AttributeValue> item : queryRadiusResult.getItem()) {
		//System.out.println(" => " + item); //TODO remove DEBUG code
		
		PointData pd = extractPointData(item, fetchAttributes);
		result.add(pd);
	}
	
	return result;
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private PointData extractPointData(Map<String, AttributeValue> item, String... fetchAttributes) {
	PointData pd = new PointData();
	try {
		String geoJsonString = item.get(config().getGeoJsonAttributeName()).getS();
		GeoPoint geoPoint = GeoJsonMapper.geoPointFromString(geoJsonString);
		
		pd.setLatitude(geoPoint.getLatitude());
		pd.setLongitude(geoPoint.getLongitude());
		pd.setRangeKey(item.get(config().getRangeKeyAttributeName()).getS());
		
		for (String fa : fetchAttributes) {
			pd.getData().put(fa, item.get(fa).getS());
		}
	}
	catch (Exception e) {
		throw new RuntimeException(e);
	}
	return pd;
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void queryRectangle(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint minPoint = new GeoPoint(requestObject.getDouble("minLat"), requestObject.getDouble("minLng"));
	GeoPoint maxPoint = new GeoPoint(requestObject.getDouble("maxLat"), requestObject.getDouble("maxLng"));
	String filterUserId = requestObject.getString("filterUserId");

	List<String> attributesToGet = new ArrayList<String>();
	attributesToGet.add(config.getRangeKeyAttributeName());
	attributesToGet.add(config.getGeoJsonAttributeName());
	attributesToGet.add("title");
	attributesToGet.add("userId");

	QueryRectangleRequest queryRectangleRequest = new QueryRectangleRequest(minPoint, maxPoint);
	queryRectangleRequest.getQueryRequest().setAttributesToGet(attributesToGet);
	QueryRectangleResult queryRectangleResult = geoDataManager.queryRectangle(queryRectangleRequest);

	printGeoQueryResult(queryRectangleResult, out, filterUserId);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void queryRadius(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint centerPoint = new GeoPoint(requestObject.getDouble("lat"), requestObject.getDouble("lng"));
	double radiusInMeter = requestObject.getDouble("radiusInMeter");
	String filterUserId = requestObject.getString("filterUserId");

	List<String> attributesToGet = new ArrayList<String>();
	attributesToGet.add(config.getRangeKeyAttributeName());
	attributesToGet.add(config.getGeoJsonAttributeName());
	attributesToGet.add("title");
	attributesToGet.add("userId");

	QueryRadiusRequest queryRadiusRequest = new QueryRadiusRequest(centerPoint, radiusInMeter);
	queryRadiusRequest.getQueryRequest().setAttributesToGet(attributesToGet);
	QueryRadiusResult queryRadiusResult = geoDataManager.queryRadius(queryRadiusRequest);

	printGeoQueryResult(queryRadiusResult, out, filterUserId);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
public void putPoint(PointData pd) { 
	GeoPoint geoPoint = new GeoPoint(pd.getLatitude(), pd.getLongitude());
	AttributeValue rangeKeyValue = new AttributeValue().withS(pd.getRangeKey());

	PutPointRequest putPointRequest = new PutPointRequest(geoPoint, rangeKeyValue);
	
	for (Entry<String, String> e : pd.getData().entrySet()) {
		AttributeValue value = new AttributeValue().withS(e.getValue());
		putPointRequest.getPutItemRequest().getItem().put(e.getKey(), value);
	}

	geoDataManager.putPoint(putPointRequest);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void putPoint(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint geoPoint = new GeoPoint(requestObject.getDouble("lat"), requestObject.getDouble("lng"));
	AttributeValue rangeKeyAttributeValue = new AttributeValue().withS(requestObject.getString("s3-photo-url"));
	AttributeValue titleAttributeValue = new AttributeValue().withS(requestObject.getString("title"));
	AttributeValue userIdAttributeValue = new AttributeValue().withS(requestObject.getString("userId"));

	PutPointRequest putPointRequest = new PutPointRequest(geoPoint, rangeKeyAttributeValue);
	putPointRequest.getPutItemRequest().addItemEntry("title", titleAttributeValue);
	putPointRequest.getPutItemRequest().addItemEntry("userId", userIdAttributeValue);

	PutPointResult putPointResult = geoDataManager.putPoint(putPointRequest);
	printPutPointResult(putPointResult, out);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void getPoint(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint geoPoint = new GeoPoint(requestObject.getDouble("lat"), requestObject.getDouble("lng"));
	AttributeValue rangeKeyAttributeValue = new AttributeValue().withS(requestObject.getString("rangeKey"));

	GetPointRequest getPointRequest = new GetPointRequest(geoPoint, rangeKeyAttributeValue);
	GetPointResult getPointResult = geoDataManager.getPoint(getPointRequest);

	printGetPointRequest(getPointResult, out);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void deletePoint(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint geoPoint = new GeoPoint(requestObject.getDouble("lat"), requestObject.getDouble("lng"));
	AttributeValue rangeKeyAttributeValue = new AttributeValue().withS(requestObject.getString("rangeKey"));

	DeletePointRequest deletePointRequest = new DeletePointRequest(geoPoint, rangeKeyAttributeValue);
	DeletePointResult deletePointResult = geoDataManager.deletePoint(deletePointRequest);

	printDeletePointResult(deletePointResult, out);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
/**
 * Filter out any points outside of the queried area from the input list.
 * 
 * @param list
 *            List of items return by Amazon DynamoDB. It may contains points outside of the actual area queried.
 * 
 * @param latLngRect
 *            Queried area. Any points outside of this area need to be discarded.
 * 
 * @return List of items within the queried area.
 */
private List<Map<String, AttributeValue>> filter(List<Map<String, AttributeValue>> list,
		GeoQueryRequest geoQueryRequest) {

	List<Map<String, AttributeValue>> result = new ArrayList<Map<String, AttributeValue>>();

	S2LatLngRect latLngRect = null;
	S2LatLng centerLatLng = null;
	double radiusInMeter = 0;
	if (geoQueryRequest instanceof QueryRectangleRequest) {
		latLngRect = S2Util.getBoundingLatLngRect(geoQueryRequest);
	} else if (geoQueryRequest instanceof QueryRadiusRequest) {
		GeoPoint centerPoint = ((QueryRadiusRequest) geoQueryRequest).getCenterPoint();
		centerLatLng = S2LatLng.fromDegrees(centerPoint.getLatitude(), centerPoint.getLongitude());

		radiusInMeter = ((QueryRadiusRequest) geoQueryRequest).getRadiusInMeter();
	}

	for (Map<String, AttributeValue> item : list) {
		String geoJson = item.get(config.getGeoJsonAttributeName()).getS();
		GeoPoint geoPoint = GeoJsonMapper.geoPointFromString(geoJson);

		S2LatLng latLng = S2LatLng.fromDegrees(geoPoint.getLatitude(), geoPoint.getLongitude());
		if (latLngRect != null && latLngRect.contains(latLng)) {
			result.add(item);
		} else if (centerLatLng != null && radiusInMeter > 0
				&& centerLatLng.getEarthDistance(latLng) <= radiusInMeter) {
			result.add(item);
		}
	}

	return result;
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
public static long generateGeohash(GeoPoint geoPoint) {
	S2LatLng latLng = S2LatLng.fromDegrees(geoPoint.getLatitude(), geoPoint.getLongitude());
	S2Cell cell = new S2Cell(latLng);
	S2CellId cellId = cell.id();

	return cellId.id();
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
public static GeoPoint geoPointFromString(String jsonString) {
	try {
		return mapper.readValue(jsonString, GeoPoint.class);
	} catch (IOException e) {
		throw new RuntimeException(e);
	}
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void putPoint(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint geoPoint = new GeoPoint(requestObject.getDouble("lat"), requestObject.getDouble("lng"));
	AttributeValue rangeKeyAttributeValue = new AttributeValue().withS(UUID.randomUUID().toString());
	AttributeValue schoolNameKeyAttributeValue = new AttributeValue().withS(requestObject.getString("schoolName"));

	PutPointRequest putPointRequest = new PutPointRequest(geoPoint, rangeKeyAttributeValue);
	putPointRequest.getPutItemRequest().addItemEntry("schoolName", schoolNameKeyAttributeValue);

	PutPointResult putPointResult = geoDataManager.putPoint(putPointRequest);

	printPutPointResult(putPointResult, out);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void updatePoint(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint geoPoint = new GeoPoint(requestObject.getDouble("lat"), requestObject.getDouble("lng"));
	AttributeValue rangeKeyAttributeValue = new AttributeValue().withS(requestObject.getString("rangeKey"));

	String schoolName = requestObject.getString("schoolName");
	AttributeValueUpdate schoolNameValueUpdate = null;

	String memo = requestObject.getString("memo");
	AttributeValueUpdate memoValueUpdate = null;

	if (schoolName == null || schoolName.equalsIgnoreCase("")) {
		schoolNameValueUpdate = new AttributeValueUpdate().withAction(AttributeAction.DELETE);
	} else {
		AttributeValue schoolNameAttributeValue = new AttributeValue().withS(schoolName);
		schoolNameValueUpdate = new AttributeValueUpdate().withAction(AttributeAction.PUT).withValue(
				schoolNameAttributeValue);
	}

	if (memo == null || memo.equalsIgnoreCase("")) {
		memoValueUpdate = new AttributeValueUpdate().withAction(AttributeAction.DELETE);
	} else {
		AttributeValue memoAttributeValue = new AttributeValue().withS(memo);
		memoValueUpdate = new AttributeValueUpdate().withAction(AttributeAction.PUT).withValue(memoAttributeValue);
	}

	UpdatePointRequest updatePointRequest = new UpdatePointRequest(geoPoint, rangeKeyAttributeValue);
	updatePointRequest.getUpdateItemRequest().addAttributeUpdatesEntry("schoolName", schoolNameValueUpdate);
	updatePointRequest.getUpdateItemRequest().addAttributeUpdatesEntry("memo", memoValueUpdate);

	UpdatePointResult updatePointResult = geoDataManager.updatePoint(updatePointRequest);

	printUpdatePointResult(updatePointResult, out);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void queryRectangle(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint minPoint = new GeoPoint(requestObject.getDouble("minLat"), requestObject.getDouble("minLng"));
	GeoPoint maxPoint = new GeoPoint(requestObject.getDouble("maxLat"), requestObject.getDouble("maxLng"));
	
	List<String> attributesToGet = new ArrayList<String>();
	attributesToGet.add(config.getRangeKeyAttributeName());
	attributesToGet.add(config.getGeoJsonAttributeName());
	attributesToGet.add("schoolName");

	QueryRectangleRequest queryRectangleRequest = new QueryRectangleRequest(minPoint, maxPoint);
	queryRectangleRequest.getQueryRequest().setAttributesToGet(attributesToGet);
	QueryRectangleResult queryRectangleResult = geoDataManager.queryRectangle(queryRectangleRequest);

	printGeoQueryResult(queryRectangleResult, out);
}
 

import com.amazonaws.geo.model.GeoPoint; //导入依赖的package包/类
private void queryRadius(JSONObject requestObject, PrintWriter out) throws IOException, JSONException {
	GeoPoint centerPoint = new GeoPoint(requestObject.getDouble("lat"), requestObject.getDouble("lng"));
	double radiusInMeter = requestObject.getDouble("radiusInMeter");
	
	List<String> attributesToGet = new ArrayList<String>();
	attributesToGet.add(config.getRangeKeyAttributeName());
	attributesToGet.add(config.getGeoJsonAttributeName());
	attributesToGet.add("schoolName");

	QueryRadiusRequest queryRadiusRequest = new QueryRadiusRequest(centerPoint, radiusInMeter);
	queryRadiusRequest.getQueryRequest().setAttributesToGet(attributesToGet);
	QueryRadiusResult queryRadiusResult = geoDataManager.queryRadius(queryRadiusRequest);

	printGeoQueryResult(queryRadiusResult, out);
}