com.jstatcom.model

Class JSCConstants

java.lang.Object

com.jstatcom.model.JSCConstants

public class JSCConstants
extends java.lang.Object

This class contains miscellaneous constants for the data model. The class might be extended to create subclasses that add further constants by using the following declaration:

public static final JSCConstants NEW_CONSTANT = new JSCConstants("NEW_CONSTANT");

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	DEBUG Debug flag that can be set with the DEBUG property.
static java.lang.Double	NaN Missing value.
static long	NaNLongBits Missing value as long.
static java.lang.Double	NEG_INF Negative infinity.
static java.lang.Double	POS_INF Positive infinity.

Method Summary

Modifier and Type	Method and Description
static java.lang.String	checkNameThrowEx(java.lang.String name) Checks whether name is a valid variable name and throws an exception of not.
boolean	equals(java.lang.Object o) Override prevention method to enforce a.equals(b) if and only if a==b.
static java.lang.String	getSystemTemp() Reads out the system property java.io.tempdir.
static java.lang.String	getUserDir() Reads out the system property user.dir.
static java.lang.String	getUserHome() Reads out the system property home.
int	hashCode() Override prevention method invokes super method.
static java.lang.String	isValidName(java.lang.String name) Checks whether name conforms to the rules for valid variable names.
java.lang.String	toString() Gets string representation of this object.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

DEBUG

public static boolean DEBUG

Debug flag that can be set with the DEBUG property.

NaN

public static final java.lang.Double NaN

Missing value.

NaNLongBits

public static final long NaNLongBits

Missing value as long.

POS_INF

public static final java.lang.Double POS_INF

Positive infinity.

NEG_INF

public static final java.lang.Double NEG_INF

Negative infinity.

Method Detail

checkNameThrowEx

public static java.lang.String checkNameThrowEx(java.lang.String name)

Checks whether name is a valid variable name and throws an exception of not.

Important:
null is allowed as an argument because this is often convenient. In this case null is returned.

Parameters:

name - the string to check

Returns:

trimmed name if ok or null if name was null

Throws:

java.lang.IllegalArgumentException - with error string if (JSCConstants.isValidName(name) != null)

equals

public final boolean equals(java.lang.Object o)

Override prevention method to enforce a.equals(b) if and only if a==b.

Overrides:

equals in class java.lang.Object

Parameters:

o - object to compare with

Returns:

true if equal, false otherwise

hashCode

public final int hashCode()

Override prevention method invokes super method.

Overrides:

hashCode in class java.lang.Object

Returns:

hash code

isValidName

public static java.lang.String isValidName(java.lang.String name)

Checks whether name conforms to the rules for valid variable names. Valid names must not be null or empty and must begin with either a letter or '_' . They may contain letters, digits and '_', but no other characters or whitespace.

Parameters:

name - the name to be checked

Returns:

null if ok, error message otherwise

toString

public java.lang.String toString()

Gets string representation of this object.

Overrides:

toString in class java.lang.Object

Returns:

a string

getSystemTemp

public static java.lang.String getSystemTemp()

Reads out the system property java.io.tempdir.

Returns:

the directory name of the temporary directory

Throws:

java.lang.RuntimeException - if property is empty

getUserDir

public static java.lang.String getUserDir()

Reads out the system property user.dir.

Returns:

the directory name of the user directory

Throws:

java.lang.RuntimeException - if property is empty

getUserHome

public static java.lang.String getUserHome()

Reads out the system property home.

Returns:

the directory name of the user's home directory

Throws:

java.lang.RuntimeException - if property is empty