Examples of com.espertech.esper.plugin.PlugInAggregationMultiFunctionHandler

com.espertech.esper.plugin.PlugInAggregationMultiFunctionHandler
Part of the aggregation multi-function extension API, this class represents one of more aggregation function expression instances. This class is responsible for providing a state reader (called accessor) for returning value from aggregation state, and for providing return type information of the accessor, and for providing state factory information.
Note the information returned by {@link #getReturnType()} must match thevalue objects returned by {@link #getAccessor()}.

For example, assuming you have an EPL statement such as select search(), query() from MyEvent then you would likely use one handler class and two handler objects (one for search and one for query).


    public AggregationMethodFactory validateAggregationChild(ExprValidationContext validationContext) throws ExprValidationException
    {
        ExprNode[] parameters = this.getChildNodes();
        PlugInAggregationMultiFunctionValidationContext ctx = new PlugInAggregationMultiFunctionValidationContext(functionName, validationContext.getStreamTypeService().getEventTypes(), parameters, validationContext.getStreamTypeService().getEngineURIQualifier(), validationContext.getStatementName(), validationContext, config);
        PlugInAggregationMultiFunctionHandler handlerPlugin = pluginAggregationMultiFunctionFactory.validateGetHandler(ctx);
        factory = new ExprPlugInAggMultiFunctionNodeFactory(this, handlerPlugin);
        return factory;
    }

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    public AggregationMethodFactory validateAggregationChild(ExprValidationContext validationContext) throws ExprValidationException
    {
        ExprNode[] parameters = this.getChildNodes();
        PlugInAggregationMultiFunctionValidationContext ctx = new PlugInAggregationMultiFunctionValidationContext(functionName, validationContext.getStreamTypeService().getEventTypes(), parameters, validationContext.getStreamTypeService().getEngineURIQualifier(), validationContext.getStatementName(), validationContext, config);
        PlugInAggregationMultiFunctionHandler handlerPlugin = pluginAggregationMultiFunctionFactory.validateGetHandler(ctx);
        factory = new ExprPlugInAggMultiFunctionNodeFactory(handlerPlugin);
        return factory;
    }

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Related Classes of com.espertech.esper.plugin.PlugInAggregationMultiFunctionHandler

com.espertech.esper.epl.expression.ExprPlugInAggMultiFunctionNode

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