Examples with ConstantExpressionExecutor org.wso2.siddhi.core.executor.ConstantExpressionExecutor used on opensource projects

Example 16 with ConstantExpressionExecutor

use of org.wso2.siddhi.core.executor.ConstantExpressionExecutor in project siddhi by wso2.

the class SortWindowProcessor method init.

@Override
protected void init(ExpressionExecutor[] attributeExpressionExecutors, ConfigReader configReader, boolean outputExpectsExpiredEvents, SiddhiAppContext siddhiAppContext) {
    if (attributeExpressionExecutors[0].getReturnType() == Attribute.Type.INT) {
        lengthToKeep = Integer.parseInt(String.valueOf(((ConstantExpressionExecutor) attributeExpressionExecutors[0]).getValue()));
    } else {
        throw new UnsupportedOperationException("The first parameter should be an integer");
    }
    parameterInfo = new ArrayList<Object[]>();
    eventComparator = new EventComparator();
    for (int i = 1, parametersLength = attributeExpressionExecutors.length; i < parametersLength; i++) {
        if (!(attributeExpressionExecutors[i] instanceof VariableExpressionExecutor)) {
            throw new UnsupportedOperationException("Required a variable, but found a string parameter");
        } else {
            ExpressionExecutor variableExpressionExecutor = attributeExpressionExecutors[i];
            int order;
            String nextParameter;
            if (i + 1 < parametersLength && attributeExpressionExecutors[i + 1].getReturnType() == Attribute.Type.STRING) {
                nextParameter = (String) ((ConstantExpressionExecutor) attributeExpressionExecutors[i + 1]).getValue();
                if (nextParameter.equalsIgnoreCase(DESC)) {
                    order = -1;
                    i++;
                } else if (nextParameter.equalsIgnoreCase(ASC)) {
                    order = 1;
                    i++;
                } else {
                    throw new UnsupportedOperationException("Parameter string literals should only be \"asc\" or " + "\"desc\"");
                }
            } else {
                // assigning the default order: "asc"
                order = 1;
            }
            parameterInfo.add(new Object[] { variableExpressionExecutor, order });
        }
    }
}