org.outerj.expression
Class AbstractExpression

java.lang.Object
  org.outerj.expression.AbstractExpression

All Implemented Interfaces:

Expression

Direct Known Subclasses:

AbsFunction, AbstractComparisonExpression, AbstractNumericOperator, AbstractXReporterExpression, AddDaysFunction, AndFunction, BeginOfMonthFunction, BeginOfQuarterFunction, BeginOfYearFunction, CeilingFunction, ColumnFunction, ConcatenateFunction, DateFunction, DayOfMonthFunction, DayOfWeekFunction, DayOfYearFunction, DaysInMonthFunction, EndOfMonthFunction, EndOfQuarterFunction, EndOfYearFunction, FalseFunction, FloorFunction, IfFunction, LengthFunction, LowerCaseFunction, MonthFunction, NegateFunction, NotFunction, NowFunction, NVLFunction, OrFunction, PowerFunction, RandomFunction, RemainderFunction, SAvgFunction, SCountFunction, SetTimeFunction, SFirstFunction, SLastFunction, SMaxFunction, SMinFunction, SSumFunction, SubstringFunction, TextToDateFunction, TrimFunction, TrueFunction, UpperCaseFunction, ValidationError, ValidationOk, ValidationValue, YearFunction

public abstract class AbstractExpression

extends java.lang.Object

implements Expression

Field Summary

protected java.util.ArrayList	arguments
protected int	column
protected int	line

Constructor Summary

AbstractExpression()

Method Summary

void	addArgument(Expression expression) Add an argument to this expression.
void	addArgument(int index, Expression expression) Add an argument to this expression.
void	check() Check if the expression's structure is OK.
protected void	checkArgument(int position, java.lang.Class clazz)
protected void	checkArguments(java.lang.Class[] types)
protected void	checkArgumentsOfSameType(java.lang.Class clazz) Checks that all the arguments are of the same type.
protected void	checkNoArguments()
int	getColumn() Returns the column number where this expression occurs.
int	getLine() Returns the line number where this expression occurs.
void	setPosition(int line, int column) Called by the parser to set the position of this expression.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.outerj.expression.Expression

evaluate, getDescription, getResultType

Field Detail

arguments

protected java.util.ArrayList arguments

line

protected int line

column

protected int column

Constructor Detail

AbstractExpression

public AbstractExpression()

Method Detail

addArgument

public void addArgument(Expression expression)

Description copied from interface: Expression

Add an argument to this expression. The argument itself is also an expression. The expression can check the validity of its arguments in the Expression.check() method.

Specified by:

addArgument in interface Expression

addArgument

public void addArgument(int index,
                        Expression expression)

Description copied from interface: Expression

Add an argument to this expression. The argument itself is also an expression. The expression can check the validity of its arguments in the Expression.check() method.

Specified by:

addArgument in interface Expression

setPosition

public void setPosition(int line,
                        int column)

Description copied from interface: Expression

Called by the parser to set the position of this expression.

Specified by:

setPosition in interface Expression

getLine

public int getLine()

Description copied from interface: Expression

Returns the line number where this expression occurs.

Specified by:

getLine in interface Expression

getColumn

public int getColumn()

Description copied from interface: Expression

Returns the column number where this expression occurs.

Specified by:

getColumn in interface Expression

check

public void check()
           throws ExpressionException

Description copied from interface: Expression

Check if the expression's structure is OK. If everything is ok, this method should just return.

Specified by:

check in interface Expression

Throws:

ExpressionException - to indicate the expression-syntax error.

checkArguments

protected void checkArguments(java.lang.Class[] types)
                       throws ExpressionException

Throws:

ExpressionException

checkArgument

protected void checkArgument(int position,
                             java.lang.Class clazz)
                      throws ExpressionException

Throws:

ExpressionException

checkNoArguments

protected void checkNoArguments()
                         throws ExpressionException

Throws:

ExpressionException

checkArgumentsOfSameType

protected void checkArgumentsOfSameType(java.lang.Class clazz)
                                 throws ExpressionException

Checks that all the arguments are of the same type.

Throws:

ExpressionException