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/*
* Copyright 2017 - 2022 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.handler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import io.netty.channel.ChannelHandler;
import org.apache.commons.jexl2.JexlEngine;
import org.apache.commons.jexl2.JexlException;
import org.apache.commons.jexl2.MapContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.BaseDataHandler;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import org.traccar.model.Attribute;
import org.traccar.model.Device;
import org.traccar.model.Position;
import org.traccar.session.cache.CacheManager;
import javax.inject.Inject;
import javax.inject.Singleton;
@Singleton
@ChannelHandler.Sharable
public class ComputedAttributesHandler extends BaseDataHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(ComputedAttributesHandler.class);
private final CacheManager cacheManager;
private final JexlEngine engine;
private final boolean includeDeviceAttributes;
@Inject
public ComputedAttributesHandler(Config config, CacheManager cacheManager) {
this.cacheManager = cacheManager;
engine = new JexlEngine();
engine.setStrict(true);
engine.setFunctions(Collections.singletonMap("math", Math.class));
includeDeviceAttributes = config.getBoolean(Keys.PROCESSING_COMPUTED_ATTRIBUTES_DEVICE_ATTRIBUTES);
}
private MapContext prepareContext(Position position) {
MapContext result = new MapContext();
if (includeDeviceAttributes) {
Device device = cacheManager.getObject(Device.class, position.getDeviceId());
if (device != null) {
for (Object key : device.getAttributes().keySet()) {
result.set((String) key, device.getAttributes().get(key));
}
}
}
Set<Method> methods = new HashSet<>(Arrays.asList(position.getClass().getMethods()));
methods.removeAll(Arrays.asList(Object.class.getMethods()));
for (Method method : methods) {
if (method.getName().startsWith("get") && method.getParameterTypes().length == 0) {
String name = Character.toLowerCase(method.getName().charAt(3)) + 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) {
LOGGER.warn("Attribute reflection error", error);
}
}
}
return result;
}
/**
* @deprecated logic needs to be extracted to be used in API resource
*/
@Deprecated
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 = cacheManager.getDeviceObjects(position.getDeviceId(), Attribute.class);
for (Attribute attribute : attributes) {
if (attribute.getAttribute() != null) {
Object result = null;
try {
result = computeAttribute(attribute, position);
} catch (JexlException error) {
LOGGER.warn("Attribute computation error", error);
}
if (result != null) {
try {
switch (attribute.getType()) {
case "number":
Number numberValue = (Number) result;
position.getAttributes().put(attribute.getAttribute(), numberValue);
break;
case "boolean":
Boolean booleanValue = (Boolean) result;
position.getAttributes().put(attribute.getAttribute(), booleanValue);
break;
default:
position.getAttributes().put(attribute.getAttribute(), result.toString());
}
} catch (ClassCastException error) {
LOGGER.warn("Attribute cast error", error);
}
}
}
}
return position;
}
}
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