From ae09c5920d0a89c1243cea81abe300272994ff6b Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Tue, 23 Jun 2020 22:13:19 -0700
Subject: Add PositionStack geocoder

---
 src/main/java/org/traccar/MainModule.java          |  3 ++
 .../java/org/traccar/geocoder/JsonGeocoder.java    |  7 +++
 .../traccar/geocoder/PositionStackGeocoder.java    | 55 ++++++++++++++++++++++
 .../java/org/traccar/geocoder/GeocoderTest.java    |  8 ++++
 4 files changed, 73 insertions(+)
 create mode 100644 src/main/java/org/traccar/geocoder/PositionStackGeocoder.java

diff --git a/src/main/java/org/traccar/MainModule.java b/src/main/java/org/traccar/MainModule.java
index bf578054d..5e5ab2327 100644
--- a/src/main/java/org/traccar/MainModule.java
+++ b/src/main/java/org/traccar/MainModule.java
@@ -43,6 +43,7 @@ import org.traccar.geocoder.MapQuestGeocoder;
 import org.traccar.geocoder.MapmyIndiaGeocoder;
 import org.traccar.geocoder.NominatimGeocoder;
 import org.traccar.geocoder.OpenCageGeocoder;
+import org.traccar.geocoder.PositionStackGeocoder;
 import org.traccar.geocoder.TomTomGeocoder;
 import org.traccar.geolocation.GeolocationProvider;
 import org.traccar.geolocation.GoogleGeolocationProvider;
@@ -177,6 +178,8 @@ public class MainModule extends AbstractModule {
                     return new MapmyIndiaGeocoder(url, key, cacheSize, addressFormat);
                 case "tomtom":
                     return new TomTomGeocoder(url, key, cacheSize, addressFormat);
+                case "positionstack":
+                    return new PositionStackGeocoder(key, cacheSize, addressFormat);
                 default:
                     return new GoogleGeocoder(key, language, cacheSize, addressFormat);
             }
diff --git a/src/main/java/org/traccar/geocoder/JsonGeocoder.java b/src/main/java/org/traccar/geocoder/JsonGeocoder.java
index ed59a1d8d..8c442def3 100644
--- a/src/main/java/org/traccar/geocoder/JsonGeocoder.java
+++ b/src/main/java/org/traccar/geocoder/JsonGeocoder.java
@@ -50,6 +50,13 @@ public abstract class JsonGeocoder implements Geocoder {
         }
     }
 
+    protected String readValue(JsonObject object, String key) {
+        if (object.containsKey(key) && !object.isNull(key)) {
+            return object.getString(key);
+        }
+        return null;
+    }
+
     private String handleResponse(
             double latitude, double longitude, JsonObject json, ReverseGeocoderCallback callback) {
 
diff --git a/src/main/java/org/traccar/geocoder/PositionStackGeocoder.java b/src/main/java/org/traccar/geocoder/PositionStackGeocoder.java
new file mode 100644
index 000000000..2674a68ca
--- /dev/null
+++ b/src/main/java/org/traccar/geocoder/PositionStackGeocoder.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2020 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.geocoder;
+
+import javax.json.JsonArray;
+import javax.json.JsonObject;
+
+public class PositionStackGeocoder extends JsonGeocoder {
+
+    private static String formatUrl(String key) {
+        return "http://api.positionstack.com/v1/reverse?access_key=" + key + "&query=%f,%f";
+    }
+
+    public PositionStackGeocoder(String key, int cacheSize, AddressFormat addressFormat) {
+        super(formatUrl(key), cacheSize, addressFormat);
+    }
+
+    @Override
+    public Address parseAddress(JsonObject json) {
+        JsonArray result = json.getJsonArray("data");
+
+        if (result != null && !result.isEmpty()) {
+            JsonObject record = result.getJsonObject(0);
+
+            Address address = new Address();
+
+            address.setFormattedAddress(readValue(record, "label"));
+            address.setHouse(readValue(record, "number"));
+            address.setStreet(readValue(record, "street"));
+            address.setSuburb(readValue(record, "neighbourhood"));
+            address.setSettlement(readValue(record, "locality"));
+            address.setState(readValue(record, "region"));
+            address.setCountry(readValue(record, "country_code"));
+            address.setPostcode(readValue(record, "postal_code"));
+
+            return address;
+        }
+
+        return null;
+    }
+
+}
diff --git a/src/test/java/org/traccar/geocoder/GeocoderTest.java b/src/test/java/org/traccar/geocoder/GeocoderTest.java
index e70719b89..d93a72a87 100644
--- a/src/test/java/org/traccar/geocoder/GeocoderTest.java
+++ b/src/test/java/org/traccar/geocoder/GeocoderTest.java
@@ -85,4 +85,12 @@ public class GeocoderTest {
         String address = geocoder.getAddress(28.6129602407977, 77.2294557094574, null);
         assertEquals("New Delhi, Delhi. 1 m from India Gate pin-110001 (India)", address);
     }
+
+    @Ignore
+    @Test
+    public void testPositionStack() {
+        Geocoder geocoder = new PositionStackGeocoder("", 0, new AddressFormat("%f"));
+        String address = geocoder.getAddress(28.6129602407977, 77.2294557094574, null);
+        assertEquals("India Gate, New Delhi, India", address);
+    }
 }
-- 
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