Examples with Expression org.ballerinalang.siddhi.query.api.expression.Expression used on opensource projects

Example 31 with Expression

use of org.ballerinalang.siddhi.query.api.expression.Expression in project ballerina by ballerina-lang.

the class AvgIncrementalAttributeAggregator method getBaseAggregators.

@Override
public Expression[] getBaseAggregators() {
    Expression sumAggregator = Expression.function("sum", Expression.variable(getBaseAttributes()[0].getName()));
    Expression countAggregator = Expression.function("sum", Expression.variable(getBaseAttributes()[1].getName()));
    return new Expression[] { sumAggregator, countAggregator };
}

Example 32 with Expression

use of org.ballerinalang.siddhi.query.api.expression.Expression in project ballerina by ballerina-lang.

the class CountIncrementalAttributeAggregator method init.

@Override
public void init(String attributeName, Attribute.Type attributeType) {
    Attribute count;
    Expression countInitialValue;
    // Since we set the initial value of count, we can simply set it as long
    // However, since count is summed internally (in avg incremental calculation),
    // ensure that either double or long is used here (since return value of sum is long or
    // double. Long is chosen here)
    count = new Attribute("AGG_COUNT", Attribute.Type.LONG);
    countInitialValue = Expression.value(1L);
    this.baseAttributes = new Attribute[] { count };
    this.baseAttributesInitialValues = new Expression[] { countInitialValue };
    assert baseAttributes.length == baseAttributesInitialValues.length;
}