1 /* 2 * Copyright 2015 The gRPC Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.grpc.examples.routeguide; 18 19 import com.google.protobuf.util.JsonFormat; 20 import java.io.IOException; 21 import java.io.InputStream; 22 import java.io.InputStreamReader; 23 import java.io.Reader; 24 import java.net.URL; 25 import java.nio.charset.Charset; 26 import java.util.List; 27 28 /** 29 * Common utilities for the RouteGuide demo. 30 */ 31 public class RouteGuideUtil { 32 private static final double COORD_FACTOR = 1e7; 33 34 /** 35 * Gets the latitude for the given point. 36 */ getLatitude(Point location)37 public static double getLatitude(Point location) { 38 return location.getLatitude() / COORD_FACTOR; 39 } 40 41 /** 42 * Gets the longitude for the given point. 43 */ getLongitude(Point location)44 public static double getLongitude(Point location) { 45 return location.getLongitude() / COORD_FACTOR; 46 } 47 48 /** 49 * Gets the default features file from classpath. 50 */ getDefaultFeaturesFile()51 public static URL getDefaultFeaturesFile() { 52 return RouteGuideServer.class.getResource("route_guide_db.json"); 53 } 54 55 /** 56 * Parses the JSON input file containing the list of features. 57 */ parseFeatures(URL file)58 public static List<Feature> parseFeatures(URL file) throws IOException { 59 InputStream input = file.openStream(); 60 try { 61 Reader reader = new InputStreamReader(input, Charset.forName("UTF-8")); 62 try { 63 FeatureDatabase.Builder database = FeatureDatabase.newBuilder(); 64 JsonFormat.parser().merge(reader, database); 65 return database.getFeatureList(); 66 } finally { 67 reader.close(); 68 } 69 } finally { 70 input.close(); 71 } 72 } 73 74 /** 75 * Indicates whether the given feature exists (i.e. has a valid name). 76 */ exists(Feature feature)77 public static boolean exists(Feature feature) { 78 return feature != null && !feature.getName().isEmpty(); 79 } 80 } 81