public final class Null extends Object implements Castable, Dumpable
Modifier and Type | Method and Description |
---|---|
Boolean |
castToBoolean(Boolean defaultValue)
cast the castable value to a boolean value
|
boolean |
castToBooleanValue()
cast the castable value to a boolean value
|
DateTime |
castToDateTime()
cast the castable value to a date time object
|
DateTime |
castToDateTime(DateTime defaultValue)
cast the castable value to a date time object
|
double |
castToDoubleValue()
cast the castable value to a double value
|
double |
castToDoubleValue(double defaultValue)
cast the castable value to a double value
|
String |
castToString()
cast the castable value to a string, other than the Method toString, this Method can throw a Exception
|
String |
castToString(String defaultValue)
cast the castable value to a string, return the default value, when the method is not castable
|
int |
compareTo(boolean b) |
int |
compareTo(DateTime dt) |
int |
compareTo(double d) |
int |
compareTo(String str) |
DumpData |
toDumpData(PageContext pageContext,
int maxlevel,
DumpProperties dp)
method to print out information to a object as HTML
|
String |
toString() |
public String castToString() throws ExpressionException
Castable
castToString
in interface Castable
ExpressionException
public String castToString(String defaultValue)
Castable
castToString
in interface Castable
public boolean castToBooleanValue() throws ExpressionException
Castable
castToBooleanValue
in interface Castable
ExpressionException
public Boolean castToBoolean(Boolean defaultValue)
Castable
castToBoolean
in interface Castable
public double castToDoubleValue() throws ExpressionException
Castable
castToDoubleValue
in interface Castable
ExpressionException
public double castToDoubleValue(double defaultValue)
Castable
castToDoubleValue
in interface Castable
public DateTime castToDateTime() throws ExpressionException
Castable
castToDateTime
in interface Castable
ExpressionException
public DateTime castToDateTime(DateTime defaultValue)
Castable
castToDateTime
in interface Castable
defaultValue
- returned when it is not possible to cast to a dateTime objectpublic DumpData toDumpData(PageContext pageContext, int maxlevel, DumpProperties dp)
Dumpable
toDumpData
in interface Dumpable
public int compareTo(String str) throws PageException
compareTo
in interface Castable
PageException
public int compareTo(boolean b) throws PageException
compareTo
in interface Castable
PageException
public int compareTo(double d) throws PageException
compareTo
in interface Castable
PageException
public int compareTo(DateTime dt) throws PageException
compareTo
in interface Castable
PageException
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