1 files changed, 89 insertions, 0 deletions
diff --git a/src/org/traccar/geocoder/JsonReverseGeocoder.java b/src/org/traccar/geocoder/JsonReverseGeocoder.java
new file mode 100644
index 000000000..808b7c83f
--- /dev/null
+++ b/src/org/traccar/geocoder/JsonReverseGeocoder.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2015 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 com.ning.http.client.AsyncCompletionHandler;
+import com.ning.http.client.Response;
+import org.traccar.Context;
+
+import javax.json.Json;
+import javax.json.JsonObject;
+import javax.json.JsonReader;
+import java.util.AbstractMap;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public abstract class JsonReverseGeocoder implements ReverseGeocoder {
+
+    private final String url;
+
+    private Map<Map.Entry<Double, Double>, String> cache;
+
+    public JsonReverseGeocoder(String url, final int cacheSize) {
+        this.url = url;
+        if (cacheSize > 0) {
+            this.cache = Collections.synchronizedMap(new LinkedHashMap<Map.Entry<Double, Double>, String>() {
+                @Override
+                protected boolean removeEldestEntry(Map.Entry eldest) {
+                    return size() > cacheSize;
+                }
+            });
+        }
+    }
+
+    @Override
+    public void getAddress(
+            final AddressFormat format, final double latitude,
+            final double longitude, final ReverseGeocoderCallback callback) {
+
+        if (cache != null) {
+            String cachedAddress = cache.get(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude));
+            if (cachedAddress != null) {
+                callback.onSuccess(cachedAddress);
+                return;
+            }
+        }
+
+        Context.getAsyncHttpClient().prepareGet(String.format(url, latitude, longitude))
+                .execute(new AsyncCompletionHandler() {
+            @Override
+            public Object onCompleted(Response response) throws Exception {
+                try (JsonReader reader = Json.createReader(response.getResponseBodyAsStream())) {
+                    Address address = parseAddress(reader.readObject());
+                    if (address != null) {
+                        String formattedAddress = format.format(address);
+                        if (cache != null) {
+                            cache.put(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude), formattedAddress);
+                        }
+                        callback.onSuccess(formattedAddress);
+                    } else {
+                        callback.onFailure(new IllegalArgumentException("Empty address"));
+                    }
+                }
+                return null;
+            }
+
+            @Override
+            public void onThrowable(Throwable t) {
+                callback.onFailure(t);
+            }
+        });
+    }
+
+    public abstract Address parseAddress(JsonObject json);
+
+}