Package org.apache.qpid.jms.selector.filter

Class ConstantExpression

java.lang.Object

org.apache.qpid.jms.selector.filter.ConstantExpression

All Implemented Interfaces:

Expression

public class ConstantExpression
extends Object
implements Expression

Represents a constant expression

Field Summary

Fields

Modifier and Type	Field	Description
static org.apache.qpid.jms.selector.filter.ConstantExpression.BooleanConstantExpression	FALSE
static org.apache.qpid.jms.selector.filter.ConstantExpression.BooleanConstantExpression	NULL
static org.apache.qpid.jms.selector.filter.ConstantExpression.BooleanConstantExpression	TRUE

Constructor Summary

Constructors

Constructor	Description
ConstantExpression(Object value)

Method Summary

Modifier and Type	Method	Description
static ConstantExpression	createFloat(String text)
static ConstantExpression	createFromDecimal(String text)
static ConstantExpression	createFromHex(String text)
static ConstantExpression	createFromOctal(String text)
static String	encodeString(String s)	Encodes the value of string so that it looks like it would look like when it was provided in a selector.
boolean	equals(Object o)	TODO: more efficient hashCode()
Object	evaluate(Filterable message)
Object	getValue()
int	hashCode()	TODO: more efficient hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

NULL

public static final org.apache.qpid.jms.selector.filter.ConstantExpression.BooleanConstantExpression NULL

TRUE

public static final org.apache.qpid.jms.selector.filter.ConstantExpression.BooleanConstantExpression TRUE

FALSE

public static final org.apache.qpid.jms.selector.filter.ConstantExpression.BooleanConstantExpression FALSE

Constructor Detail

ConstantExpression

public ConstantExpression(Object value)

Method Detail

createFromDecimal

public static ConstantExpression createFromDecimal(String text)

createFromHex

public static ConstantExpression createFromHex(String text)

createFromOctal

public static ConstantExpression createFromOctal(String text)

createFloat

public static ConstantExpression createFloat(String text)

evaluate

public Object evaluate(Filterable message)
                throws FilterException

Specified by:

evaluate in interface Expression

Parameters:

message - The message that is being selected against.

Returns:

the value of this expression

Throws:

FilterException - if an error occurs during evaluation.

getValue

public Object getValue()

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()

hashCode

public int hashCode()

TODO: more efficient hashCode()

Overrides:

hashCode in class Object

See Also:

Object.hashCode()

equals

public boolean equals(Object o)

TODO: more efficient hashCode()

Overrides:

equals in class Object

See Also:

Object.equals(java.lang.Object)

encodeString

public static String encodeString(String s)

Encodes the value of string so that it looks like it would look like when it was provided in a selector.

Parameters:

s - the original string

Returns:

the encoded String