org.relique.jdbc.csv
Class Expression

java.lang.Object
  org.relique.jdbc.csv.Expression

public abstract class Expression
extends Object

Constructor Summary

Expression()

Method Summary

List<org.relique.jdbc.csv.AggregateFunction>	aggregateFunctions()
Object	eval(Map<String,Object> env)
boolean	isValid() Is this a valid expression such as A > 5 or an invalid mix of logical and arithmetic such as (A > 5) + 1 that we cannot detect during parsing.
void	resetAggregateFunctions() Reset aggregate function each time it is used in a subquery.
List<String>	usedColumns(Set<String> availableColumns)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Expression

public Expression()

Method Detail

eval

public Object eval(Map<String,Object> env)
            throws SQLException

Throws:

SQLException

usedColumns

public List<String> usedColumns(Set<String> availableColumns)

aggregateFunctions

public List<org.relique.jdbc.csv.AggregateFunction> aggregateFunctions()

isValid

public boolean isValid()

Is this a valid expression such as A > 5 or an invalid mix of logical and arithmetic such as (A > 5) + 1 that we cannot detect during parsing.

Returns:

true if valid.

resetAggregateFunctions

public void resetAggregateFunctions()

Reset aggregate function each time it is used in a subquery.