Package de.uplanet.lucy.server.auxiliaries

Class ObjectHelper

java.lang.Object

de.uplanet.lucy.server.auxiliaries.ObjectHelper

@VelocityVariable("ObjectHelper")
@VelocityCallable("singleton")
public final class ObjectHelper
extends Object

Constructor Summary

Constructors

Constructor	Description
ObjectHelper()

Method Summary

Modifier and Type	Method	Description
Object	getNull()
IValueHolder<?>	getNullValueHolder()
boolean	isFalseOrNull(Object p_obj)	Checks if the given argument is a boolean false, or null.
boolean	isNull(Object p_obj)	Checks if the given argument is null.
boolean	isTrueOrNull(Object p_obj)	Checks if the given argument is a boolean true, or null.
boolean	isVHNull(IValueHolder<?> p_vh)
boolean	isVHNullOrEmpty(IValueHolder<?> p_vh)
Object	orElse(Object p_obj, Object p_fallback)	Checks if the given object reference is null, and returns either the object itself if it is not null, or the provided fallback value if the object reference is null.

Methods inherited from class java.lang.Object

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

Constructor Details

ObjectHelper

public ObjectHelper()

Method Details

isNull

public boolean isNull(Object p_obj)

Checks if the given argument is null.

Parameters:

p_obj - The value to be checked.

Returns:

true if the given value is null, or false otherwise.

orElse

public Object orElse(Object p_obj,
 Object p_fallback)

Checks if the given object reference is null, and returns either the object itself if it is not null, or the provided fallback value if the object reference is null.

Parameters:

p_obj - The object reference to check.

p_fallback - The fallback value.

Returns:

The value of the object reference if it is not null, the fallback value otherwise.

See Also:

• TextUtil.fallbackIfNullOrEmpty(CharSequence, String)

isTrueOrNull

public boolean isTrueOrNull(Object p_obj)

Checks if the given argument is a boolean true, or null.

Parameters:

p_obj - A boolean value, or null.

Returns:

true if the given value is a boolean true or null, or false otherwise.

Throws:

IllegalArgumentException - If the given argument is neither a boolean value nor null.

isFalseOrNull

public boolean isFalseOrNull(Object p_obj)

Checks if the given argument is a boolean false, or null.

Parameters:

p_obj - A boolean value, or null.

Returns:

true if the given value is a boolean false or null, or false otherwise.

Throws:

IllegalArgumentException - If the given argument is neither a boolean value nor null.

getNull

public Object getNull()

getNullValueHolder

public IValueHolder<?> getNullValueHolder()

isVHNull

public boolean isVHNull(IValueHolder<?> p_vh)

isVHNullOrEmpty

public boolean isVHNullOrEmpty(IValueHolder<?> p_vh)