org.openbp.common
Class CommonUtil

java.lang.Object
  org.openbp.common.CommonUtil

public final class CommonUtil
extends java.lang.Object

General utility functions.

Author:

Heiko Erhardt

Method Summary

static int	compareNull(java.lang.Object o1, java.lang.Object o2) Compares two objects that implement the java.lang.Comparable interface that may also be null.
static boolean	equalsNull(java.lang.Object o1, java.lang.Object o2) Checks if two objects are equal or both null.
static int	getJavaVersionInt() Gets the java version as 3 digit integer (e\.g\. 141).
static java.lang.String	getJavaVersionStr() Gets the java version as string (e\.g\. "1.4.1").
static boolean	isJava14() Checks if the current Java version is 1\.4 or higher.
static int	rnd(double v) Rounds a double to an integer value using neares-number-rounding.
static int	rnd(float v) Rounds a float to an integer value using neares-number-rounding.
static java.lang.String	setSystemProperty(java.lang.String key, java.lang.String value) Sets the spcecified system property, including null value check.
static java.lang.String	toStringNull(java.lang.Object o) Null-safe toString implementation

Methods inherited from class java.lang.Object

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

Method Detail

equalsNull

public static boolean equalsNull(java.lang.Object o1,
                                 java.lang.Object o2)

Checks if two objects are equal or both null.

Parameters:

o1 - First object

o2 - Second object

Returns:

true Both objects are null or equal (using Objects.equals)
false The objects are not equal or only one of them is null.

compareNull

public static int compareNull(java.lang.Object o1,
                              java.lang.Object o2)

Compares two objects that implement the java.lang.Comparable interface that may also be null.

Parameters:

o1 - First object or null

o2 - Second object or null

Returns:

0 Both objects are null or equal
< 0 The first object os lexicographically smaller than the second object
> 0 The first object os lexicographically larger than the second object

Throws:

java.lang.ClassCastException - If one of the objects does not implement the Comparable interface

toStringNull

public static java.lang.String toStringNull(java.lang.Object o)

Null-safe toString implementation

Parameters:

o - Object to print

Returns:

o != null ? o.toString : null

rnd

public static int rnd(float v)

Rounds a float to an integer value using neares-number-rounding.

Parameters:

v - Value to round

Returns:

(int) Math.floor (v + 0.5f)

rnd

public static int rnd(double v)

Rounds a double to an integer value using neares-number-rounding.

Parameters:

v - Value to round

Returns:

(int) Math.floor (v + 0.5d)

setSystemProperty

public static java.lang.String setSystemProperty(java.lang.String key,
                                                 java.lang.String value)

Sets the spcecified system property, including null value check. System.setProperty will cause a null pointer exception if the value is null. This method will remove the property from the system properties on null values.

Parameters:

key - Property name

value - Value or null

Returns:

The old property value

isJava14

public static boolean isJava14()

Checks if the current Java version is 1\.4 or higher.

getJavaVersionStr

public static java.lang.String getJavaVersionStr()

Gets the java version as string (e\.g\. "1.4.1").

getJavaVersionInt

public static int getJavaVersionInt()

Gets the java version as 3 digit integer (e\.g\. 141).