1 files changed, 121 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/geocoder/JsonGeocoder.java b/src/main/java/org/traccar/geocoder/JsonGeocoder.java
new file mode 100644
index 000000000..ed59a1d8d
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+++ b/src/main/java/org/traccar/geocoder/JsonGeocoder.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2015 - 2018 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 org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.Context;
+
+import javax.json.JsonObject;
+import javax.ws.rs.ClientErrorException;
+import javax.ws.rs.client.Invocation;
+import javax.ws.rs.client.InvocationCallback;
+import java.util.AbstractMap;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public abstract class JsonGeocoder implements Geocoder {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(JsonGeocoder.class);
+
+    private final String url;
+    private final AddressFormat addressFormat;
+
+    private Map<Map.Entry<Double, Double>, String> cache;
+
+    public JsonGeocoder(String url, final int cacheSize, AddressFormat addressFormat) {
+        this.url = url;
+        this.addressFormat = addressFormat;
+        if (cacheSize > 0) {
+            this.cache = Collections.synchronizedMap(new LinkedHashMap<Map.Entry<Double, Double>, String>() {
+                @Override
+                protected boolean removeEldestEntry(Map.Entry eldest) {
+                    return size() > cacheSize;
+                }
+            });
+        }
+    }
+
+    private String handleResponse(
+            double latitude, double longitude, JsonObject json, ReverseGeocoderCallback callback) {
+
+        Address address = parseAddress(json);
+        if (address != null) {
+            String formattedAddress = addressFormat.format(address);
+            if (cache != null) {
+                cache.put(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude), formattedAddress);
+            }
+            if (callback != null) {
+                callback.onSuccess(formattedAddress);
+            }
+            return formattedAddress;
+        } else {
+            String msg = "Empty address. Error: " + parseError(json);
+            if (callback != null) {
+                callback.onFailure(new GeocoderException(msg));
+            } else {
+                LOGGER.warn(msg);
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public String getAddress(
+            final double latitude, final double longitude, final ReverseGeocoderCallback callback) {
+
+        if (cache != null) {
+            String cachedAddress = cache.get(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude));
+            if (cachedAddress != null) {
+                if (callback != null) {
+                    callback.onSuccess(cachedAddress);
+                }
+                return cachedAddress;
+            }
+        }
+
+        Invocation.Builder request = Context.getClient().target(String.format(url, latitude, longitude)).request();
+
+        if (callback != null) {
+            request.async().get(new InvocationCallback<JsonObject>() {
+                @Override
+                public void completed(JsonObject json) {
+                    handleResponse(latitude, longitude, json, callback);
+                }
+
+                @Override
+                public void failed(Throwable throwable) {
+                    callback.onFailure(throwable);
+                }
+            });
+        } else {
+            try {
+                return handleResponse(latitude, longitude, request.get(JsonObject.class), null);
+            } catch (ClientErrorException e) {
+                LOGGER.warn("Geocoder network error", e);
+            }
+        }
+        return null;
+    }
+
+    public abstract Address parseAddress(JsonObject json);
+
+    protected String parseError(JsonObject json) {
+        return null;
+    }
+
+}