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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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.geocode;
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>() {
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.onResult(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.onResult(formattedAddress);
} else {
callback.onResult(null);
}
}
return null;
}
@Override
public void onThrowable(Throwable t) {
callback.onResult(null);
}
});
}
public abstract Address parseAddress(JsonObject json);
}
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