Examples of com.espertech.esper.client.EventType

com.espertech.esper.client.EventType
This interface provides metadata on events.
The interface exposes events as organizations of named values. The contract is that any event in the system must have a name-based way of accessing sub-data within its event type. A simple example is a Java bean: the names can be property names, and those properties can have still more properties beneath them. Another example is a Map structure. Here string names can refer to data objects.
The interface presents an immutable view of events. There are no methods to change property values. Events by definition are an observation of a past occurrance or state change and may not be modified.
Information on the super-types (superclass and interfaces implemented by JavaBean events) is also available, for Java POJO events as well as for Map event types that has supertypes.
Implementations provide metadata on the properties that an implemenation itself provides.
Implementations also allow property expressioms that may use nested, indexed, mapped or a combination of these as a syntax to access property types and values.
Implementations in addition may provide a means to access property values as event fragments, which are typed events themselves.

        }


        // If we have an name for this type, add it
        if (insertIntoDesc != null)
        {
            EventType existingType = eventAdapterService.getExistsTypeByName(insertIntoDesc.getEventTypeName());
            if (existingType != null)
            {
                selectExprInsertEventBean = SelectExprInsertEventBean.getInsertUnderlying(eventAdapterService, existingType);
            }
            if ((existingType != null) && (selectExprInsertEventBean != null))

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                    streamNum = i;
                    break;
                }


                // see if the stream name is known as a nested event type
                EventType candidateProviderOfFragments = typeService.getEventTypes()[i];
                // for the native event type we don't need to fragment, we simply use the property itself since all wrappers understand Java objects
                if (!(candidateProviderOfFragments instanceof NativeEventType) && (candidateProviderOfFragments.getFragmentType(streamName) != null))
                {
                    streamNum = i;
                    isFragmentEvent = true;
                    break;
                }

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                return new Pair<EventStream, StatementLock>(eventStream, pair.getSecond().getEpStatementHandle().getStatementLock());
            }
        }


        // New event stream
        EventType resultEventType = filterSpec.getResultEventType();
        EventStream zeroDepthStream = new ZeroDepthStream(resultEventType);


        // audit proxy
        EventStream inputStream = getAuditProxy(epStatementHandle.getStatementName(), annotations, filterSpec, zeroDepthStream);

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            streamSelect.setStreamNumber(1);
            selectNoWildcard.add(streamSelect);
        }


        // Set up event types for select-clause evaluation: The first type does not contain anything as its the named window row which is not present for insert
        EventType dummyTypeNoProperties = new MapEventType(EventTypeMetadata.createAnonymous("merge_named_window_insert"), "merge_named_window_insert", null, Collections.<String, Object>emptyMap(), null, null);
        EventType[] eventTypes = new EventType[] {dummyTypeNoProperties, triggeringEventType};
        String[] streamNames = new String[] {UuidGenerator.generate(), triggeringStreamName};
        StreamTypeService streamTypeService = new StreamTypeServiceImpl(eventTypes, streamNames, new boolean[1], statementContext.getEngineURI(), false);


        // Get select expr processor

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            }
            eventTypeFields.put(name, clazz);
            columnNum++;
        }


        EventType eventType;
        if (outputRowConversionHook == null) {
            eventType = eventAdapterService.createAnonymousMapType(eventTypeFields);
        }
        else {
            Class carrierClass = outputRowConversionHook.getOutputRowType(new SQLOutputRowTypeContext(databaseStreamSpec.getDatabaseName(), databaseStreamSpec.getSqlWithSubsParams(), eventTypeFields));

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import java.util.List;


public class ExprDotEvalFirstLastOf extends ExprDotEvalEnumMethodBase {


    public EventType[] getAddStreamTypes(String enumMethodUsedName, List<String> goesToNames, EventType inputEventType, Class collectionComponentType, List<ExprDotEvalParam> bodiesAndParameters) {
        EventType firstParamType;
        if (inputEventType == null) {
            firstParamType = ExprDotNodeUtility.makeTransientMapType(enumMethodUsedName, goesToNames.get(0), collectionComponentType);
        }
        else {
            firstParamType = inputEventType;

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        if (enumSrc.getFirst() == null) {
            String message = "Enumeration method '" + enumMethodUsedName + "' requires an expression yielding an event-collection as input paramater";
            throw new ExprValidationException(message);
        }


        EventType setType = enumSrc.getFirst().getEventTypeCollection();
        if (setType != inputEventType) {
            boolean isSubtype = EventTypeUtility.isTypeOrSubTypeOf(setType, inputEventType);
            if (!isSubtype) {
                String message = "Enumeration method '" + enumMethodUsedName + "' expects event type '" + inputEventType.getName() + "' but receives event type '" + enumSrc.getFirst().getEventTypeCollection().getName() + "'";
                throw new ExprValidationException(message);

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import java.util.List;


public class ExprDotEvalAggregate extends ExprDotEvalEnumMethodBase {


    public EventType[] getAddStreamTypes(String enumMethodUsedName, List<String> goesToNames, EventType inputEventType, Class collectionComponentType, List<ExprDotEvalParam> bodiesAndParameters) {
        EventType evalEventType;
        if (inputEventType == null) {
            evalEventType = ExprDotNodeUtility.makeTransientMapType(enumMethodUsedName, goesToNames.get(1), collectionComponentType);
        }
        else {
            evalEventType = inputEventType;
        }


        Class initializationType = bodiesAndParameters.get(0).getBodyEvaluator().getType();
        EventType typeResult = ExprDotNodeUtility.makeTransientMapType(enumMethodUsedName, goesToNames.get(0), initializationType);


        return new EventType[] {typeResult, evalEventType};
    }

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                boolean isArray = MapEventType.isPropertyArray(nestedName);
                if (isArray) {
                    nestedName = MapEventType.getPropertyRemoveArray(nestedName);
                }


                EventType innerType = eventAdapterService.getExistsTypeByName(nestedName);
                if (!(innerType instanceof MapEventType))
                {
                    return null;
                }
                
                String remainingProps = toPropertyEPL(properties, count);
                return innerType.getPropertyType(remainingProps);
            }
            else
            {
                if (!(nestedType instanceof Map))
                {

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                        boolean isArray = MapEventType.isPropertyArray(nestedName);
                        if (isArray) {
                            nestedName = MapEventType.getPropertyRemoveArray(nestedName);
                        }


                        EventType innerType = eventAdapterService.getExistsTypeByName(nestedName);
                        if (!(innerType instanceof MapEventType))
                        {
                            return null;
                        }


                        String remainingProps = toPropertyEPL(properties, count);
                        getters.add(innerType.getGetter(remainingProps));
                        break; // the single Pojo getter handles the rest
                    }
                    else
                    {
                        // treat the return type of the map property as a POJO

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