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author | Anton Tananaev <anton.tananaev@gmail.com> | 2019-02-23 15:23:35 -0800 |
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committer | Anton Tananaev <anton.tananaev@gmail.com> | 2019-02-23 15:23:35 -0800 |
commit | 563243a8da888244e910a4a7a10fb86ad525fdd4 (patch) | |
tree | 0a50db4a2ca280d3cd3b2b78065d31ef96e5fef5 /src/org/traccar/handler/ComputedAttributesHandler.java | |
parent | 7aa3760f02361a04e2c3b73ba5b9cc41bcb8ec3d (diff) | |
download | traccar-server-563243a8da888244e910a4a7a10fb86ad525fdd4.tar.gz traccar-server-563243a8da888244e910a4a7a10fb86ad525fdd4.tar.bz2 traccar-server-563243a8da888244e910a4a7a10fb86ad525fdd4.zip |
Handler refactoring
Diffstat (limited to 'src/org/traccar/handler/ComputedAttributesHandler.java')
-rw-r--r-- | src/org/traccar/handler/ComputedAttributesHandler.java | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/org/traccar/handler/ComputedAttributesHandler.java b/src/org/traccar/handler/ComputedAttributesHandler.java new file mode 100644 index 000000000..4b5b8c20d --- /dev/null +++ b/src/org/traccar/handler/ComputedAttributesHandler.java @@ -0,0 +1,129 @@ +/* + * 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.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.Context; +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 JexlEngine engine; + + private boolean mapDeviceAttributes; + + public ComputedAttributesHandler() { + engine = new JexlEngine(); + engine.setStrict(true); + engine.setFunctions(Collections.singletonMap("math", (Object) Math.class)); + if (Context.getConfig() != null) { + mapDeviceAttributes = Context.getConfig().getBoolean("handler.computedAttributes.deviceAttributes"); + } + } + + private MapContext prepareContext(Position position) { + MapContext result = new MapContext(); + if (mapDeviceAttributes) { + Device device = Context.getIdentityManager().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; + } + + 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().getItems( + Context.getAttributesManager().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; + } + +} |