org.cert.cc.util
Class NullSafe

java.lang.Object
  org.cert.cc.util.NullSafe

public final class NullSafe
extends Object

NullSafe is a collection of null and thread safe static methods.

© 2010 Carnegie Mellon University

Author:

Steve Scholnick

Method Summary

static Calendar	clone(Calendar input) Creates a new Calendar from an existing one
static boolean	equals(Object o1, Object o2) Returns if two objects are equals.
static Calendar	incrementDays(Calendar input, int numberOfDays) Increments input Calendar the number of days specified.
static Calendar	incrementDays(Date d, int numberOfDays) Increments input Date the number of days specified.
static boolean	isDigitsOnly(String s) Returns if the String contains only digits.
static boolean	isEmpty(String s) Returns if a String is empty.
static boolean	isWeekend(Calendar c) Returns if the Calendar's current day is a weekend day
static boolean	toBoolean(String s) Returns a boolean created from a String.
static String	trim(String s) Returns a trimmed String.

Methods inherited from class java.lang.Object

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

Method Detail

incrementDays

public static Calendar incrementDays(Calendar input,
                                     int numberOfDays)

Increments input Calendar the number of days specified. Weekend days are skipped. The original Calendar is not changed.

Parameters:

input - Input Calendar

numberOfDays - Number of days

Returns:

Newly incremented Calendar

incrementDays

public static Calendar incrementDays(Date d,
                                     int numberOfDays)

Increments input Date the number of days specified. Weekend days are skipped. The original Date is not changed.

Parameters:

input - Input Date

numberOfDays - Number of days

Returns:

Newly incremented Calendar

clone

public static Calendar clone(Calendar input)

Creates a new Calendar from an existing one

isWeekend

public static boolean isWeekend(Calendar c)

Returns if the Calendar's current day is a weekend day

isEmpty

public static boolean isEmpty(String s)

Returns if a String is empty. An empty String is defined as:

• s is null
• The literal string "null"
• A String that only contains whitespace

Parameters:

s - Input String

Returns:

Is empty?

isDigitsOnly

public static boolean isDigitsOnly(String s)

Returns if the String contains only digits. An empty String will return null

trim

public static String trim(String s)

Returns a trimmed String. null input returns a null

Parameters:

s - String

Returns:

trimmed String

equals

public static boolean equals(Object o1,
                             Object o2)

Returns if two objects are equals. If both objects are null, they are considered equal and true is returned.

Parameters:

o1 - first object

o2 - second object

Returns:

equality

toBoolean

public static boolean toBoolean(String s)

Returns a boolean created from a String. If the String is empty, false is returned. yes, true, and 1 are all considered true; everything else is false. The check is case-insensitive.

Parameters:

s - String

Returns:

boolean