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diff --git a/src/main/java/org/traccar/handler/ComputedAttributesHandler.java b/src/main/java/org/traccar/handler/ComputedAttributesHandler.java
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+/*
+ * Copyright 2017 - 2019 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.database.AttributesManager;
+import org.traccar.database.IdentityManager;
+import org.traccar.model.Attribute;
+import org.traccar.model.Device;
+import org.traccar.model.Position;
+
+@ChannelHandler.Sharable
+public class ComputedAttributesHandler extends BaseDataHandler {
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(ComputedAttributesHandler.class);
+
+ private final IdentityManager identityManager;
+ private final AttributesManager attributesManager;
+
+ private final JexlEngine engine;
+
+ private final boolean includeDeviceAttributes;
+
+ public ComputedAttributesHandler(
+ Config config, IdentityManager identityManager, AttributesManager attributesManager) {
+ this.identityManager = identityManager;
+ this.attributesManager = attributesManager;
+ 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 = identityManager.getById(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 = attributesManager.getItems(
+ attributesManager.getAllDeviceItems(position.getDeviceId()));
+ 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;
+ }
+
+}