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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 org.traccar.helper.Log;
import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonReader;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.AbstractMap;
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 = new LinkedHashMap<Map.Entry<Double, Double>, String>() {
protected boolean removeEldestEntry(Map.Entry eldest) {
return size() > cacheSize;
}
};
}
}
@Override
public String getAddress(AddressFormat format, double latitude, double longitude) {
if (cache != null) {
String cachedAddress = cache.get(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude));
if (cachedAddress != null) {
return cachedAddress;
}
}
try {
HttpURLConnection conn = (HttpURLConnection) new URL(String.format(url, latitude, longitude)).openConnection();
conn.setRequestProperty("Connection", "close"); // don't keep-alive connections
try {
InputStreamReader streamReader = new InputStreamReader(conn.getInputStream());
try (JsonReader reader = Json.createReader(streamReader)) {
Address address = parseAddress(reader.readObject());
while (streamReader.read() > 0); // make sure we reached the end
if (address != null) {
String formattedAddress = format.format(address);
if (cache != null) {
cache.put(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude), formattedAddress);
}
return formattedAddress;
}
}
} finally {
conn.disconnect();
}
} catch(Exception error) {
Log.warning(error);
}
return null;
}
protected abstract Address parseAddress(JsonObject json);
}
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