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 (InstrumentationHelper.ENABLED) { InstrumentationHelper.get().aFilterRemove();}
            return;
        }


        EventType eventType = pair.getFilterValueSet().getEventType();
        FilterHandleSetNode rootNode = eventTypeIndex.get(eventType);


        // Now remove from tree
        if (rootNode != null) {
            IndexTreeBuilder.remove(eventType, filterCallback, pair.getIndexPairs(), rootNode);

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                EventTypeIndexBuilderValueIndexesPair pair = entry.getValue();
                if (statementIds.contains(entry.getKey().getStatementId()))
                {
                    list.add(new FilterSetEntry(entry.getKey(), pair.getFilterValueSet()));


                    EventType eventType = pair.getFilterValueSet().getEventType();
                    FilterHandleSetNode rootNode = eventTypeIndex.get(eventType);


                    // Now remove from tree
                    IndexTreeBuilder.remove(eventType, entry.getKey(), pair.getIndexPairs(), rootNode);
                }

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                count++;
                continue;
            }
            if (childNode instanceof ExprEvaluatorEnumeration) {
                ExprEvaluatorEnumeration enumeration = (ExprEvaluatorEnumeration) childNode;
                EventType eventType = enumeration.getEventTypeSingle(eventAdapterService, statementId);
                childEvals[count] = childNode.getExprEvaluator();
                paramTypes[count] = childEvals[count].getType();
                allConstants = false;
                if (eventType != null) {
                    childEvalsEventBeanReturnTypes[count] = new ExprNodeUtilExprEvalStreamNumEnumSingle(enumeration);
                    allowEventBeanType[count] = true;
                    count++;
                    continue;
                }
                EventType eventTypeColl = enumeration.getEventTypeCollection(eventAdapterService, statementId);
                if (eventTypeColl != null) {
                    childEvalsEventBeanReturnTypes[count] = new ExprNodeUtilExprEvalStreamNumEnumColl(enumeration);
                    allowEventBeanCollType[count] = true;
                    count++;
                    continue;

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        {
            ExprNodeIdentifierVisitor visitor = new ExprNodeIdentifierVisitor(false);
            node.accept(visitor);
            List<Pair<Integer, String>> propertiesNodes = visitor.getExprProperties();
            for (Pair<Integer, String> pair : propertiesNodes) {
                EventType originType = types.length > pair.getFirst() ? types[pair.getFirst()] : null;
                if (originType == null || contextPropertyRegistry == null || !contextPropertyRegistry.isPartitionProperty(originType, pair.getSecond())) {
                    nonAggProps.add(pair);
                }                
            }
        }

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        propertyGetters = new EventPropertyGetter[properties.length];
        for (int i = 0; i < keyStreamNumbers.length; i++)
        {
            int streamNumber = keyStreamNumbers[i];
            String property = properties[i];
            EventType eventType = eventTypes[streamNumber];
            propertyGetters[i] = eventType.getGetter(property);


            if (propertyGetters[i] == null)
            {
                throw new IllegalArgumentException("Property named '" + properties[i] + "' is invalid for type " + eventType);
            }

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        return getAssignAnonymousType(eventAdapterService, statementId);
    }


    private EventType getAssignAnonymousType(EventAdapterService eventAdapterService, String statementId) throws ExprValidationException {
        Map<String, Object> rowType = getRowType();
        EventType resultEventType = eventAdapterService.createAnonymousMapType(statementId + "_subquery_" + this.getSubselectNumber(), rowType);
        subselectMultirowType = new SubselectMultirowType(resultEventType, eventAdapterService);
        return resultEventType;
    }

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    public void validate(ExprValidationContext validationContext) throws ExprValidationException
    {
        if (validationContext.getContextDescriptor() == null) {
            throw new ExprValidationException("Context property '" + propertyName + "' cannot be used in the expression as provided");
        }
        EventType eventType = validationContext.getContextDescriptor().getContextPropertyRegistry().getContextEventType();
        if (eventType == null) {
            throw new ExprValidationException("Context property '" + propertyName + "' cannot be used in the expression as provided");
        }
        getter = eventType.getGetter(propertyName);
        if (getter == null) {
            throw new ExprValidationException("Context property '" + propertyName + "' is not a known property, known properties are " + Arrays.toString(eventType.getPropertyNames()));
        }
        returnType = eventType.getPropertyType(propertyName);
    }

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                return new Pair<EventStream, StatementAgentInstanceLock>(eventStream, pair.getSecond().getAgentInstanceHandle().getStatementAgentInstanceLock());
            }
        }


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


        // audit proxy
        EventStream inputStream = EventStreamProxy.getAuditProxy(engineURI, epStatementAgentInstanceHandle.getStatementHandle().getStatementName(), annotations, filterSpec, zeroDepthStream);

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        List<ExprChainedSpec> chainList = new ArrayList<ExprChainedSpec>(chainSpec);
        ExprChainedSpec firstItem = chainList.remove(0);


    // Get the types of the parameters for the first invocation
        boolean allowWildcard = validationContext.getStreamTypeService().getEventTypes().length == 1;
        EventType streamZeroType = null;
        if (validationContext.getStreamTypeService().getEventTypes().length > 0) {
            streamZeroType = validationContext.getStreamTypeService().getEventTypes()[0];
        }
        final ExprNodeUtilMethodDesc staticMethodDesc = ExprNodeUtility.resolveMethodAllowWildcardAndStream(clazz.getName(), null, firstItem.getName(), firstItem.getParameters(), validationContext.getMethodResolutionService(), validationContext.getEventAdapterService(), validationContext.getStatementId(), allowWildcard, streamZeroType, new ExprNodeUtilResolveExceptionHandlerDefault(firstItem.getName(), true), functionName);

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                        ExprNodeUtilResolveExceptionHandler exceptionHandler = new ExprNodeUtilResolveExceptionHandler() {
                            public ExprValidationException handle(Exception e) {
                                return new ExprValidationException("Failed to resolve");
                            }
                        };
                        EventType wildcardType = validationContext.getStreamTypeService().getEventTypes().length != 1 ? null : validationContext.getStreamTypeService().getEventTypes()[0];
                        ExprNodeUtility.resolveMethodAllowWildcardAndStream(currentInputType.getSingleValueType().getName(), currentInputType.getSingleValueType(), chainElement.getName(), chainElement.getParameters(), validationContext.getMethodResolutionService(), validationContext.getEventAdapterService(), validationContext.getStatementId(), wildcardType != null, wildcardType, exceptionHandler, chainElement.getName());
                    }
                }
                catch (Exception ex) {
                    throw new ExprValidationException("Could not resolve '" + chainElement.getName() + "' to a property of event type '" + currentInputType.getSingleEventEventType().getName() + "' or method on type '" + currentInputType + "'");

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