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/*
* 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;
}
}
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