local.tomas.expr.eval
Class ExpressionValue

java.lang.Object
  local.tomas.expr.eval.ExpressionValue

Direct Known Subclasses:

BooleanValue, DateValue, DoubleValue, IntegerValue, NullValue, StringValue

public abstract class ExpressionValue
extends Object

ExpressionValue is the base class for all classes representing values calculated from expressions. It provides default implementations for all evaluation methods.

Author:

tomas.teubner

Field Summary

static ExpressionValue

NULL The constant value NULL.

Constructor Summary

ExpressionValue()

Method Summary

static ExpressionValue	create(Object obj) Create an expression value from a basic Java object.
ExpressionValue	evalAbsFunction() Evaluate abs function.
ExpressionValue	evalAddition(ExpressionValue right) Evaluate addition.
ExpressionValue	evalAnd(ExpressionValue right) Evaluate and.
ExpressionValue	evalAvgFunction() Evaluate avg function.
ExpressionValue	evalConcatenation(ExpressionValue right) Evaluate string concatenation.
ExpressionValue	evalCountFunction() Evaluate count function.
ExpressionValue	evalDivision(ExpressionValue right) Evaluate division operation.
ExpressionValue	evalEquality(ExpressionValue right) Evaluate equality comparison.
ExpressionValue	evalGreaterEqual(ExpressionValue right) Evaluate greater equal comparison.
ExpressionValue	evalGreaterThan(ExpressionValue right) Evaluate greater than comparison.
ExpressionValue	evalInequality(ExpressionValue right) Evaluate inequality comparison.
ExpressionValue	evalInTerm(ExpressionValue right) Evaluate "in" term.
ExpressionValue	evalIsNotNull() Evaluate "is not null" term.
ExpressionValue	evalIsNull() Evaluate "is null" term.
ExpressionValue	evalLengthFunction() Evaluate length function.
ExpressionValue	evalLessEqual(ExpressionValue right) Evaluate less equal comparison.
ExpressionValue	evalLessThan(ExpressionValue right) Evaluate less than comparison.
ExpressionValue	evalLike(ExpressionValue right) Evaluate like term.
ExpressionValue	evalLowerFunction() Evaluate lower function.
ExpressionValue	evalMatch(ExpressionValue right) Evaluate regular expression matching term.
ExpressionValue	evalMaxFunction() Evaluate max function.
ExpressionValue	evalMinFunction() Evaluate min function.
ExpressionValue	evalMultiplication(ExpressionValue right) Evaluate multiplication term.
ExpressionValue	evalNegation() Evaluate negation.
ExpressionValue	evalNotLikeTerm(ExpressionValue right) Evaluate not like term.
ExpressionValue	evalOrTerm(ExpressionValue right) Evaluate or term.
ExpressionValue	evalReplaceFunction(ExpressionValue regex, ExpressionValue replacement) Evaluate replacement function.
ExpressionValue	evalSignChange() Evaluate negation.
ExpressionValue	evalSubstrFunction(ExpressionValue start, ExpressionValue length) Evaluate substring function.
ExpressionValue	evalSubtraction(ExpressionValue right) Evaluate subtraction term.
ExpressionValue	evalSumFunction() Evaluate sum function.
ExpressionValue	evalTrimFunction() Evaluate trim function.
ExpressionValue	evalUpperFunction() Evaluate upper function.
abstract Object	getObjectValue() Return the Java object representing this expression value.
abstract ExpressionType	getType() Get the type of this expression value.

Methods inherited from class java.lang.Object

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

Field Detail

NULL

public static final ExpressionValue NULL

The constant value NULL.

Constructor Detail

ExpressionValue

public ExpressionValue()

Method Detail

create

public static ExpressionValue create(Object obj)
                              throws ExpressionException

Create an expression value from a basic Java object. The object must be null or an instance of String, Double, Integer, Boolean, or java.util.Date.

Parameters:

obj - the java object

Returns:

the expression value

Throws:

ExpressionException - if obj is not a basic Java object.

getType

public abstract ExpressionType getType()

Get the type of this expression value.

Returns:

the type

getObjectValue

public abstract Object getObjectValue()

Return the Java object representing this expression value.

Returns:

the Java object

evalAbsFunction

public ExpressionValue evalAbsFunction()
                                throws ExpressionException

Evaluate abs function.

Throws:

ExpressionException - when invoked

evalAddition

public ExpressionValue evalAddition(ExpressionValue right)
                             throws ExpressionException

Evaluate addition.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalAnd

public ExpressionValue evalAnd(ExpressionValue right)
                        throws ExpressionException

Evaluate and.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalAvgFunction

public ExpressionValue evalAvgFunction()
                                throws ExpressionException

Evaluate avg function.

Throws:

ExpressionException - when invoked

evalCountFunction

public ExpressionValue evalCountFunction()
                                  throws ExpressionException

Evaluate count function.

Throws:

ExpressionException - when invoked

evalConcatenation

public ExpressionValue evalConcatenation(ExpressionValue right)
                                  throws ExpressionException

Evaluate string concatenation.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalEquality

public ExpressionValue evalEquality(ExpressionValue right)
                             throws ExpressionException

Evaluate equality comparison.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalGreaterEqual

public ExpressionValue evalGreaterEqual(ExpressionValue right)
                                 throws ExpressionException

Evaluate greater equal comparison.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalGreaterThan

public ExpressionValue evalGreaterThan(ExpressionValue right)
                                throws ExpressionException

Evaluate greater than comparison.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalInequality

public ExpressionValue evalInequality(ExpressionValue right)
                               throws ExpressionException

Evaluate inequality comparison.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalInTerm

public ExpressionValue evalInTerm(ExpressionValue right)
                           throws ExpressionException

Evaluate "in" term.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalIsNotNull

public ExpressionValue evalIsNotNull()
                              throws ExpressionException

Evaluate "is not null" term.

Throws:

ExpressionException - when invoked

evalIsNull

public ExpressionValue evalIsNull()
                           throws ExpressionException

Evaluate "is null" term.

Throws:

ExpressionException - when invoked

evalLengthFunction

public ExpressionValue evalLengthFunction()
                                   throws ExpressionException

Evaluate length function.

Throws:

ExpressionException - when invoked

evalLessEqual

public ExpressionValue evalLessEqual(ExpressionValue right)
                              throws ExpressionException

Evaluate less equal comparison.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalLessThan

public ExpressionValue evalLessThan(ExpressionValue right)
                             throws ExpressionException

Evaluate less than comparison.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalLike

public ExpressionValue evalLike(ExpressionValue right)
                         throws ExpressionException

Evaluate like term.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalDivision

public ExpressionValue evalDivision(ExpressionValue right)
                             throws ExpressionException

Evaluate division operation.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalLowerFunction

public ExpressionValue evalLowerFunction()
                                  throws ExpressionException

Evaluate lower function.

Throws:

ExpressionException - when invoked

evalMaxFunction

public ExpressionValue evalMaxFunction()
                                throws ExpressionException

Evaluate max function.

Throws:

ExpressionException - when invoked

evalMinFunction

public ExpressionValue evalMinFunction()
                                throws ExpressionException

Evaluate min function.

Throws:

ExpressionException - when invoked

evalMultiplication

public ExpressionValue evalMultiplication(ExpressionValue right)
                                   throws ExpressionException

Evaluate multiplication term.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalNegation

public ExpressionValue evalNegation()
                             throws ExpressionException

Evaluate negation.

Throws:

ExpressionException - when invoked

evalNotLikeTerm

public ExpressionValue evalNotLikeTerm(ExpressionValue right)
                                throws ExpressionException

Evaluate not like term.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalOrTerm

public ExpressionValue evalOrTerm(ExpressionValue right)
                           throws ExpressionException

Evaluate or term.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalSignChange

public ExpressionValue evalSignChange()
                               throws ExpressionException

Evaluate negation.

Throws:

ExpressionException - when invoked

evalSubstrFunction

public ExpressionValue evalSubstrFunction(ExpressionValue start,
                                          ExpressionValue length)
                                   throws ExpressionException

Evaluate substring function.

Parameters:

start - starting position

length - length

Throws:

ExpressionException - when invoked

evalSubtraction

public ExpressionValue evalSubtraction(ExpressionValue right)
                                throws ExpressionException

Evaluate subtraction term.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalSumFunction

public ExpressionValue evalSumFunction()
                                throws ExpressionException

Evaluate sum function.

Throws:

ExpressionException - when invoked

evalTrimFunction

public ExpressionValue evalTrimFunction()
                                 throws ExpressionException

Evaluate trim function.

Throws:

ExpressionException - when invoked

evalUpperFunction

public ExpressionValue evalUpperFunction()
                                  throws ExpressionException

Evaluate upper function.

Throws:

ExpressionException - when invoked

evalMatch

public ExpressionValue evalMatch(ExpressionValue right)
                          throws ExpressionException

Evaluate regular expression matching term.

Parameters:

right - right operand

Throws:

ExpressionException - when invoked

evalReplaceFunction

public ExpressionValue evalReplaceFunction(ExpressionValue regex,
                                           ExpressionValue replacement)
                                    throws ExpressionException

Evaluate replacement function.

Parameters:

regex - regular expression to match

replacement - replacement value

Throws:

ExpressionException - when invoked