aboutsummaryrefslogtreecommitdiff
path: root/src/org/traccar/geocoder/JsonGeocoder.java
blob: 2ae1fe5aa40c156e72a4de124b96b113ed0cc7b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
 * Copyright 2015 - 2017 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 org.traccar.helper.Log;

import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonReader;

import java.io.IOException;
import java.util.AbstractMap;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ExecutionException;

public abstract class JsonGeocoder implements Geocoder {

    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;
                }
            });
        }
    }

    @Override
    public void 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) {
                callback.onSuccess(cachedAddress);
                return;
            }
        }

        Context.getAsyncHttpClient().prepareGet(String.format(Locale.US, 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 = addressFormat.format(address);
                        if (cache != null) {
                            cache.put(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude), formattedAddress);
                        }
                        callback.onSuccess(formattedAddress);
                    } else {
                        callback.onFailure(new GeocoderException("Empty address"));
                    }
                }
                return null;
            }

            @Override
            public void onThrowable(Throwable t) {
                callback.onFailure(t);
            }
        });
    }

    @Override
    public String getAddress(final double latitude, final double longitude) {
        if (cache != null) {
            String cachedAddress = cache.get(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude));
            if (cachedAddress != null) {
                return cachedAddress;
            }
        }

        try {
            Response response = Context.getAsyncHttpClient()
                    .prepareGet(String.format(Locale.US, url, latitude, longitude)).execute().get();
            try (JsonReader reader = Json.createReader(response.getResponseBodyAsStream())) {
                Address address = parseAddress(reader.readObject());
                if (address != null) {
                    String formattedAddress = addressFormat.format(address);
                    if (cache != null) {
                        cache.put(new AbstractMap.SimpleImmutableEntry<>(latitude, longitude), formattedAddress);
                    }
                    return formattedAddress;
                } else {
                    Log.warning("Empty address");
                }
            }
        } catch (InterruptedException | ExecutionException | IOException error) {
            Log.warning("Geocoding failed", error);
        }
        return null;
    }

    public abstract Address parseAddress(JsonObject json);

}