@Override
public IEventInstance readFrom(
Class<IEventInstance> type,
Type generic,
Annotation[] annotation,
MediaType media,
MultivaluedMap<String, String> map,
InputStream eventStream)
throws IOException, WebApplicationException {
logger.info("started plain text message body reader");
// the InputStream event contains event in plain text format
// we should parse the event text, create IEventInstance and return it -
// the resource's put/post function will be invoked
// String eventString = getEventString(eventStream);
String eventString = "Name=StockBuy;id=111;amount=100;price=5000";
logger.info("extracted event string: " + eventString);
// the eventString consists of name=value pairs separated by delimiter
int nameAttrIndex = eventString.indexOf(EventHeader.NAME_ATTRIBUTE);
String nameSubstring = eventString.substring(nameAttrIndex);
int delimiterIndex = nameSubstring.indexOf(DELIMITER);
int tagDataSeparatorIndex = nameSubstring.indexOf(TAG_DATA_SEPARATOR);
String nameValue = nameSubstring.substring(tagDataSeparatorIndex + 1, delimiterIndex);
IEventType eventType =
WebMetadataFacade.getInstance().getEventMetadataFacade().getEventType(nameValue);
// search for all pairs of tag-data by using delimiter
Map<String, Object> attrValues = new HashMap<String, Object>();
String[] tagValuePairs = eventString.split(DELIMITER);
for (String tagValue : tagValuePairs) {
// separate the tag from the value using the tagDataSeparator
String[] separatedPair = tagValue.split(TAG_DATA_SEPARATOR);
String attrName = separatedPair[0]; // the tag is always the first in the pair
// some attributes might not have value specified at all
if (separatedPair.length < 2) {
attrValues.put(attrName, null);
continue;
}
String attrStringValue = separatedPair[1];
if (attrStringValue.equals("null")) {
// the attribute has a value of null
attrValues.put(attrName, null);
continue;
}
TypeAttribute eventTypeAttribute = eventType.getTypeAttributeSet().getAttribute(attrName);
AttributeTypesEnum attrType = eventTypeAttribute.getTypeEnum();
if (attrType.equals(AttributeTypesEnum.STRING) || eventTypeAttribute.getDimension() > 0) {
attrStringValue = "'" + attrStringValue + "'";
}
Object attrValueObject;
try {
attrValueObject =
TypeAttribute.parseConstantValue(
attrStringValue,
attrName,
eventType,
null,
WebFacadesManager.getInstance().getEepFacade());
attrValues.put(attrName, attrValueObject);
} catch (Exception e) {
String msg =
"Could not parse the event string" + eventString + ", reason: " + e.getMessage();
logger.severe(msg);
throw new ResponseException(msg);
}
}
IEventInstance event = new EventInstance(eventType, attrValues);
event.setDetectionTime(System.currentTimeMillis());
logger.info("finished message body reader");
return event;
}
@Override
public EventInstance readFrom(
Class<EventInstance> type,
Type generic,
Annotation[] annotation,
MediaType media,
MultivaluedMap<String, String> map,
InputStream eventStream)
throws IOException, WebApplicationException {
logger.info("started event message body reader");
EventInstance event = null;
String attrName = null;
String attrStringValue = null;
// the InputStream event contains event in XML NGSI format
// we should parse the object, create IEventInstance and return it -
// the resource's put/post function will be invoked
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(eventStream);
doc.getDocumentElement().normalize();
Node entityIdNode = doc.getElementsByTagName("entityId").item(0);
String entityType = entityIdNode.getAttributes().getNamedItem("type").getNodeValue();
String entityId = getNodeValue(((Node) doc.getElementsByTagName("id").item(0)));
// System.out.println("Entity type: " + entityType + " Entity id:" + entityId);
String eventName = entityType + EVENT_NAME_SUFFIX;
IEventType eventType =
WebMetadataFacade.getInstance().getEventMetadataFacade().getEventType(eventName);
logger.info("Event: " + eventName);
Map<String, Object> attrValues = new HashMap<String, Object>();
DateFormat dateFormatter = new SimpleDateFormat(DEFAULT_DATE_FORMAT);
addAttribute(ENTITY_ID_ATTRIBUTE, entityId, eventType, attrValues, dateFormatter);
addAttribute(ENTITY_TYPE_ATTRIBUTE, entityType, eventType, attrValues, dateFormatter);
// get all pairs of attribute name and value
NodeList attrNodes = doc.getElementsByTagName("contextAttribute");
for (int i = 0; i < attrNodes.getLength(); i++) {
Element attr = (Element) attrNodes.item(i);
attrName = getNodeValue(attr.getElementsByTagName("name").item(0));
attrStringValue = getNodeValue(attr.getElementsByTagName("contextValue").item(0));
// System.out.println("Attribute[" + i + "] name: " + attrName +
// " value:" + attrStringValue);
if (attrStringValue != null) {
addAttribute(attrName, attrStringValue, eventType, attrValues, dateFormatter);
}
}
event = new EventInstance(eventType, attrValues);
event.setDetectionTime(System.currentTimeMillis());
} catch (Exception e) {
String msg =
"Could not parse XML NGSI event "
+ e
+ ", reason: "
+ e.getMessage()
+ "\n last attribute name: "
+ attrName
+ " last value: "
+ attrStringValue;
logger.severe(msg);
new ResponseException(msg);
}
logger.info("finished event message body reader");
return event;
}
