@Override
public Object execute(ComplexEvent event) {
Object leftObject = leftExpressionExecutor.execute(event);
Object rightObject = rightExpressionExecutor.execute(event);
if (leftObject == null || rightObject == null) {
return null;
}
return ((Number) leftObject).floatValue() - ((Number) rightObject).floatValue();
}
/**
* The initialization method for FunctionExecutor, this method will be called before the other
* methods
*
* @param attributeExpressionExecutors are the executors of each function parameters
* @param executionPlanContext the context of the execution plan
*/
@Override
protected void init(
ExpressionExecutor[] attributeExpressionExecutors,
ExecutionPlanContext executionPlanContext) {
for (ExpressionExecutor expressionExecutor : attributeExpressionExecutors) {
Attribute.Type attributeType = expressionExecutor.getReturnType();
if (attributeType == Attribute.Type.DOUBLE) {
returnType = attributeType;
} else if ((attributeType == Attribute.Type.STRING)
|| (attributeType == Attribute.Type.BOOL)) {
throw new ExecutionPlanCreationException(
"Plus cannot have parameters with types String or Bool");
} else {
returnType = Attribute.Type.LONG;
}
}
}
@Override
public ExpressionExecutor cloneExecutor(String key) {
return new SubtractExpressionExecutorFloat(
leftExpressionExecutor.cloneExecutor(key), rightExpressionExecutor.cloneExecutor(key));
}