Package org.apache.activemq.filter

Class LogicExpression

java.lang.Object

org.apache.activemq.filter.LogicExpression

All Implemented Interfaces:

BooleanExpression, Expression

Direct Known Subclasses:

LogicExpression.ORExpression

public abstract class LogicExpression
extends Object
implements BooleanExpression

A sequence of expressions, to be combined with OR or AND conjunctions.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LogicExpression.ORExpression

Field Summary

Fields

Modifier and Type	Field	Description
protected List<BooleanExpression>	expressions

Method Summary

Modifier and Type	Method	Description
protected void	addExpression(BooleanExpression expression)
static BooleanExpression	createAND(BooleanExpression lvalue, BooleanExpression rvalue)
static BooleanExpression	createOR(BooleanExpression lvalue, BooleanExpression rvalue)
abstract Object	evaluate(MessageEvaluationContext message)
abstract String	getExpressionSymbol()	Returns the symbol that represents this binary expression.
BooleanExpression	getLeft()
BooleanExpression	getRight()
abstract boolean	matches(MessageEvaluationContext message)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

expressions

protected final List<BooleanExpression> expressions

Method Detail

addExpression

protected void addExpression(BooleanExpression expression)

getLeft

public BooleanExpression getLeft()

getRight

public BooleanExpression getRight()

getExpressionSymbol

public abstract String getExpressionSymbol()

Returns the symbol that represents this binary expression. For example, addition is represented by "+"

Returns:

toString

public String toString()

Overrides:

toString in class Object

createOR

public static BooleanExpression createOR(BooleanExpression lvalue,
                                         BooleanExpression rvalue)

createAND

public static BooleanExpression createAND(BooleanExpression lvalue,
                                          BooleanExpression rvalue)

evaluate

public abstract Object evaluate(MessageEvaluationContext message)
                         throws JMSException

Specified by:

evaluate in interface Expression

Returns:

the value of this expression

Throws:

JMSException

matches

public abstract boolean matches(MessageEvaluationContext message)
                         throws JMSException

Specified by:

matches in interface BooleanExpression

Returns:

true if the expression evaluates to Boolean.TRUE.

Throws:

JMSException