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/*
* 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.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Map;
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);
}
private MapContext prepareContext(Position position) {
MapContext result = new MapContext();
Method[] methods = position.getClass().getMethods();
for (Method method : methods) {
if (method.getName().startsWith("get") && method.getParameterTypes().length == 0
&& !method.getName().equals("getClass")) {
String name = method.getName().substring(3, 4).toLowerCase() + method.getName().substring(4);
try {
if (!method.getReturnType().equals(Map.class)) {
result.set(name, method.invoke(position));
} else {
for (Object key : ((Map) method.invoke(position)).keySet()) {
result.set((String) key, ((Map) method.invoke(position)).get(key));
}
}
} catch (IllegalAccessException | InvocationTargetException error) {
Log.warning(error);
}
}
}
return result;
}
public Object computeAttribute(Attribute attribute, Position position) throws JexlException {
return engine.createExpression(attribute.getExpression()).evaluate(prepareContext(position));
}
@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;
}
}
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