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author | Anton Tananaev <anton.tananaev@gmail.com> | 2017-05-13 11:01:48 +1200 |
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committer | GitHub <noreply@github.com> | 2017-05-13 11:01:48 +1200 |
commit | 713d6c55a007aa80850810f447308976516bfa63 (patch) | |
tree | 057e9147e724a56b6e2f3820fcf3d9ab67561fdf /src/org/traccar/processing/ComputedAttributesHandler.java | |
parent | 51920cae6438f8888090f177761a82afff33067f (diff) | |
parent | 6c17f85d04b224ff2a09265918765c9f4fc8cf94 (diff) | |
download | trackermap-server-713d6c55a007aa80850810f447308976516bfa63.tar.gz trackermap-server-713d6c55a007aa80850810f447308976516bfa63.tar.bz2 trackermap-server-713d6c55a007aa80850810f447308976516bfa63.zip |
Merge pull request #3156 from Abyss777/computed_attributes
Implement computed attributes
Diffstat (limited to 'src/org/traccar/processing/ComputedAttributesHandler.java')
-rw-r--r-- | src/org/traccar/processing/ComputedAttributesHandler.java | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/src/org/traccar/processing/ComputedAttributesHandler.java b/src/org/traccar/processing/ComputedAttributesHandler.java new file mode 100644 index 000000000..ea7c0aa1d --- /dev/null +++ b/src/org/traccar/processing/ComputedAttributesHandler.java @@ -0,0 +1,78 @@ +/* + * 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; + } + +} |