blob: ea7c0aa1d92556db26de9e548653aaf45ff6a0a6 (
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
|
/*
* Copyright 2017 Anton Tananaev (anton@traccar.org)
* Copyright 2017 Andrey Kunitsyn (andrey@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.processing;
import java.util.Collection;
import org.apache.commons.jexl2.JexlEngine;
import org.apache.commons.jexl2.JexlException;
import org.apache.commons.jexl2.MapContext;
import org.traccar.BaseDataHandler;
import org.traccar.Context;
import org.traccar.helper.Log;
import org.traccar.model.Attribute;
import org.traccar.model.Position;
public class ComputedAttributesHandler extends BaseDataHandler {
private JexlEngine engine;
public ComputedAttributesHandler() {
engine = new JexlEngine();
engine.setStrict(true);
}
public Object computeAttribute(Attribute attribute, Position position) throws JexlException {
MapContext expressionContext = new MapContext();
expressionContext.set("position", position);
return engine.createExpression(attribute.getExpression()).evaluate(expressionContext);
}
@Override
protected Position handlePosition(Position position) {
Collection<Attribute> attributes = Context.getAttributesManager().getAttributes(
Context.getAttributesManager().getAllDeviceAttributes(position.getDeviceId()));
for (Attribute attribute : attributes) {
if (attribute.getAttribute() != null) {
Object result = null;
try {
result = computeAttribute(attribute, position);
} catch (JexlException error) {
Log.warning(error);
}
if (result != null) {
try {
switch (attribute.getType()) {
case "number":
position.getAttributes().put(attribute.getAttribute(), (Number) result);
break;
case "boolean":
position.getAttributes().put(attribute.getAttribute(), (Boolean) result);
break;
default:
position.getAttributes().put(attribute.getAttribute(), result.toString());
}
} catch (ClassCastException error) {
Log.warning(error);
}
}
}
}
return position;
}
}
|
