Implement Globalstar SPOT protocol

1 files changed, 93 insertions, 0 deletions

diff --git a/src/org/traccar/protocol/SpotProtocolDecoder.java b/src/org/traccar/protocol/SpotProtocolDecoder.java
new file mode 100644
index 000000000..ed6a03c5f
--- /dev/null
+++ b/src/org/traccar/protocol/SpotProtocolDecoder.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2017 Anton Tananaev (anton@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.protocol;
+
+import com.fasterxml.jackson.databind.util.ByteBufferBackedInputStream;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.handler.codec.http.HttpRequest;
+import org.jboss.netty.handler.codec.http.HttpResponseStatus;
+import org.traccar.BaseHttpProtocolDecoder;
+import org.traccar.DeviceSession;
+import org.traccar.helper.DateUtil;
+import org.traccar.model.Position;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathConstants;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+import java.net.SocketAddress;
+import java.util.LinkedList;
+import java.util.List;
+
+public class SpotProtocolDecoder extends BaseHttpProtocolDecoder {
+
+    private DocumentBuilder documentBuilder;
+    private XPath xPath;
+    private XPathExpression messageExpression;
+
+    public SpotProtocolDecoder(SpotProtocol protocol) {
+        super(protocol);
+        try {
+            documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
+            xPath = XPathFactory.newInstance().newXPath();
+            messageExpression = xPath.compile("//messageList/message");
+        } catch (ParserConfigurationException | XPathExpressionException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        HttpRequest request = (HttpRequest) msg;
+
+        Document document = documentBuilder.parse(new ByteBufferBackedInputStream(request.getContent().toByteBuffer()));
+        NodeList nodes = (NodeList) messageExpression.evaluate(document, XPathConstants.NODESET);
+
+        List<Position> positions = new LinkedList<>();
+
+        for (int i = 0; i < nodes.getLength(); i++) {
+            Node node = nodes.item(i);
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, xPath.evaluate("esnName", node));
+            if (deviceSession != null) {
+
+                Position position = new Position();
+                position.setProtocol(getProtocolName());
+                position.setDeviceId(deviceSession.getDeviceId());
+
+                position.setValid(true);
+                position.setTime(DateUtil.parseDate(xPath.evaluate("timestamp", node)));
+                position.setLatitude(Double.parseDouble(xPath.evaluate("latitude", node)));
+                position.setLongitude(Double.parseDouble(xPath.evaluate("longitude", node)));
+
+                positions.add(position);
+
+            }
+        }
+
+        sendResponse(channel, HttpResponseStatus.OK);
+        return positions;
+    }
+
+}