Package io.atlasmap.expression.internal

Class ComparisonExpression

java.lang.Object

io.atlasmap.expression.internal.BinaryExpression

io.atlasmap.expression.internal.ComparisonExpression

All Implemented Interfaces:

Expression, BooleanExpression

public abstract class ComparisonExpression
extends BinaryExpression
implements BooleanExpression

A filter performing a comparison of two objects.

Version:

$Revision: 1.2 $

Field Summary

Fields

Modifier and Type	Field	Description
static ThreadLocal<Boolean>	CONVERT_STRING_EXPRESSIONS	true to convert string expressions, or false.

Fields inherited from class io.atlasmap.expression.internal.BinaryExpression

left, right

Fields inherited from interface io.atlasmap.expression.Expression

CACHE

Constructor Summary

Constructors

Constructor	Description
ComparisonExpression(Expression left, Expression right)	A constructor.

Method Summary

Modifier and Type	Method	Description
protected abstract boolean	asBoolean(int answer)	Gets a boolean value from the integer.
static void	checkLessThanOperand(Expression expr)	Only Numeric expressions can be used in >, >=, < or <= expressions.
protected Boolean	compare(Comparable lv, Comparable rv)	Performs Comparable.compareTo(Object).
static BooleanExpression	createBetween(Expression value, Expression left, Expression right)	Creates between expression.
static BooleanExpression	createEqual(Expression left, Expression right)	creates equal expression.
static BooleanExpression	createGreaterThan(Expression left, Expression right)	Creates greater than expression.
static BooleanExpression	createGreaterThanEqual(Expression left, Expression right)	Creates greater than equal expression.
static BooleanExpression	createInFilter(Expression left, List elements)	Creates in expression.
static BooleanExpression	createIsNotNull(Expression left)	Creates is not null expression.
static BooleanExpression	createIsNull(Expression left)	Creates is null expression.
static BooleanExpression	createLessThan(Expression left, Expression right)	Creates less than expression.
static BooleanExpression	createLessThanEqual(Expression left, Expression right)	Creates less than equal expression.
static BooleanExpression	createLike(Expression left, String right, String escape)	Creates like expression.
static BooleanExpression	createNotBetween(Expression value, Expression left, Expression right)	Creates not between expression.
static BooleanExpression	createNotEqual(Expression left, Expression right)	Creates not equal expression.
static BooleanExpression	createNotInFilter(Expression left, List elements)	Creates not in expression.
static BooleanExpression	createNotLike(Expression left, String right, String escape)	Creates not like expression.
io.atlasmap.v2.Field	evaluate(ExpressionContext expressionContext)	Evaluates the expression context.
boolean	matches(ExpressionContext message)	Check if the result of expression evaluation is true or not.

Methods inherited from class io.atlasmap.expression.internal.BinaryExpression

equals, getExpressionSymbol, getLeft, getRight, hashCode, setLeft, setRight, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

CONVERT_STRING_EXPRESSIONS

public static final ThreadLocal<Boolean> CONVERT_STRING_EXPRESSIONS

true to convert string expressions, or false.

Constructor Detail

ComparisonExpression

public ComparisonExpression(Expression left,
                            Expression right)

A constructor.

Parameters:

left - left Expression

right - right Expression

Method Detail

createBetween

public static BooleanExpression createBetween(Expression value,
                                              Expression left,
                                              Expression right)

Creates between expression.

Parameters:

value - value

left - left

right - right

Returns:

result

createNotBetween

public static BooleanExpression createNotBetween(Expression value,
                                                 Expression left,
                                                 Expression right)

Creates not between expression.

Parameters:

value - value

left - left

right - right

Returns:

result

createLike

public static BooleanExpression createLike(Expression left,
                                           String right,
                                           String escape)

Creates like expression.

Parameters:

left - left

right - right

escape - escape

Returns:

result

createNotLike

public static BooleanExpression createNotLike(Expression left,
                                              String right,
                                              String escape)

Creates not like expression.

Parameters:

left - left

right - right

escape - escape

Returns:

result

createInFilter

public static BooleanExpression createInFilter(Expression left,
                                               List elements)

Creates in expression.

Parameters:

left - left

elements - elements

Returns:

result

createNotInFilter

public static BooleanExpression createNotInFilter(Expression left,
                                                  List elements)

Creates not in expression.

Parameters:

left - left

elements - elements

Returns:

result

createIsNull

public static BooleanExpression createIsNull(Expression left)

Creates is null expression.

Parameters:

left - left

Returns:

result

createIsNotNull

public static BooleanExpression createIsNotNull(Expression left)

Creates is not null expression.

Parameters:

left - left

Returns:

result

createNotEqual

public static BooleanExpression createNotEqual(Expression left,
                                               Expression right)

Creates not equal expression.

Parameters:

left - left

right - right

Returns:

result

createEqual

public static BooleanExpression createEqual(Expression left,
                                            Expression right)

creates equal expression.

Parameters:

left - left

right - right

Returns:

result

createGreaterThan

public static BooleanExpression createGreaterThan(Expression left,
                                                  Expression right)

Creates greater than expression.

Parameters:

left - left

right - right

Returns:

result

createGreaterThanEqual

public static BooleanExpression createGreaterThanEqual(Expression left,
                                                       Expression right)

Creates greater than equal expression.

Parameters:

left - left

right - right

Returns:

result

createLessThan

public static BooleanExpression createLessThan(Expression left,
                                               Expression right)

Creates less than expression.

Parameters:

left - left

right - right

Returns:

result

createLessThanEqual

public static BooleanExpression createLessThanEqual(Expression left,
                                                    Expression right)

Creates less than equal expression.

Parameters:

left - left

right - right

Returns:

result

checkLessThanOperand

public static void checkLessThanOperand(Expression expr)

Only Numeric expressions can be used in >, >=, < or <= expressions.

Parameters:

expr - Expression

evaluate

public io.atlasmap.v2.Field evaluate(ExpressionContext expressionContext)
                              throws ExpressionException

Evaluates the expression context.

Specified by:

evaluate in interface Expression

Parameters:

expressionContext - expression context

Returns:

Field

Throws:

ExpressionException - If evaluation fails

compare

protected Boolean compare(Comparable lv,
                          Comparable rv)

Performs Comparable.compareTo(Object).

Parameters:

lv - left

rv - right

Returns:

result

asBoolean

protected abstract boolean asBoolean(int answer)

Gets a boolean value from the integer.

Parameters:

answer - integer

Returns:

result

matches

public boolean matches(ExpressionContext message)
                throws ExpressionException

Check if the result of expression evaluation is true or not.

Specified by:

matches in interface BooleanExpression

Parameters:

message - expression context

Returns:

result

Throws:

ExpressionException - exception