ModSQL
Class Operator

java.lang.Object
  |
  +--ModSQL.AbstractFunction
        |
        +--ModSQL.Operator

All Implemented Interfaces:

Function

Direct Known Subclasses:

Operator_Add, Operator_Compare, Operator_Concat, Operator_Divide, Operator_Exists, Operator_In, Operator_Is, Operator_Like, Operator_Logical, Operator_Multiply, Operator_Negate, Operator_Not

public abstract class Operator

extends AbstractFunction

Abstract implementation of Function to simplify the implementation of operators.

Author:

chris.studholme@utoronto.ca

Fields inherited from class ModSQL.AbstractFunction

all_constant, constant_non_null, evaluate_order, evaluate_order_array, out_of_order, parameter_constant, parameter_value, parameters, parameters_array

Fields inherited from interface ModSQL.Function

MATCH_BEGINS, MATCH_EQU, MATCH_GT, MATCH_GTE, MATCH_LT, MATCH_LTE, MATCH_NE

Constructor Summary

Operator()

Method Summary

void	addAllParameters(Function x) Add all of x's parameters to this function.
void	addAllParametersNegate(Function x) Add all of x's parameters to this function but apply the negation operator to each before adding them.
void	addAllParametersNot(Function x) Add all of x's parameters to this function but apply the NOT operator to each before adding them.
static Function	removeDoubleNegation(Function x) Remove all instances of double negation operators if x is an Operator_Negate object.
static Function	removeDoubleNot(Function x) Remove all instances of double NOT operators if x is an Operator_Not object.

Methods inherited from class ModSQL.AbstractFunction

addParameter, convertToSQLType, evaluate, evaluateConstantParameters, evaluateOrder, evaluateParameters, evaluateParameters, functionName, getCompatableType, getObjectSQLType, getParameter, getParameterCount, isAggregate, isConstant, optimize, postfixParameters, prefixParameters, registerWith, reset, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface ModSQL.Function

evaluate, getMaxResultSize, getSQLType

Constructor Detail

Operator

public Operator()

Method Detail

removeDoubleNot

public static Function removeDoubleNot(Function x)

Remove all instances of double NOT operators if x is an Operator_Not object. Otherwise, this method just returns x.

Parameters:

x - function to check for double NOT

Returns:

either x or x with all double NOT's removed

removeDoubleNegation

public static Function removeDoubleNegation(Function x)

Remove all instances of double negation operators if x is an Operator_Negate object. Otherwise, this method just returns x.

Parameters:

x - function to check for double negation

Returns:

either x or x with all double negation removed

addAllParameters

public void addAllParameters(Function x)
                      throws SQLException

Add all of x's parameters to this function.

Parameters:

x - function who's parameters are to be added

Throws:

SQLException - if an error occurs

addAllParametersNot

public void addAllParametersNot(Function x)
                         throws SQLException

Add all of x's parameters to this function but apply the NOT operator to each before adding them.

Parameters:

x - function who's parameters are to be added

Throws:

SQLException - if an error occurs

addAllParametersNegate

public void addAllParametersNegate(Function x)
                            throws SQLException

Add all of x's parameters to this function but apply the negation operator to each before adding them.

Parameters:

x - function who's parameters are to be added

Throws:

SQLException - if an error occurs