Package com.helger.commons.lang

Class CloneHelper

java.lang.Object

com.helger.commons.lang.CloneHelper

@Immutable
public final class CloneHelper
extends Object

Helper class for cloning objects.

Author:

Philip Helger

Method Summary

Modifier and Type	Method	Description
static <DATATYPE extends ICloneable<DATATYPE>> ICommonsList<DATATYPE>	getClonedList(Iterable<DATATYPE> aList)	Get a list where each contained item is also cloned.
static <DATATYPE> DATATYPE	getClonedValue(DATATYPE aObject)	Get a clone (= deep copy) of the passed value.
static <DATATYPE extends ICloneable<DATATYPE>> DATATYPE	getCloneIfNotNull(DATATYPE aObject)	Get a clone (= deep copy) of the passed value for all objects implementing ICloneable.
static <DATATYPE> ICommonsList<DATATYPE>	getGenericClonedList(Iterable<DATATYPE> aList)	Get a list where each contained item is also cloned.

Methods inherited from class java.lang.Object

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

Method Detail

getClonedValue

@Nullable
public static <DATATYPE> DATATYPE getClonedValue(@Nullable
                                                 DATATYPE aObject)

Get a clone (= deep copy) of the passed value. The following things are tried for cloning:

1. If the object is immutable, it is returned as is (if it is a primitive type or marked with the Immutable annotation.
2. If the object implements ICloneable it is invoked.
3. If the object implements Cloneable it is invoked.
4. If a copy constructor (a constructor taking one argument of the same class as it declares)

If all tries fail, null is returned.

Type Parameters:

DATATYPE - The source and return type

Parameters:

aObject - The object to be copied.

Returns:

null if the passed value is null or if no cloning could be performed.

getCloneIfNotNull

@Nullable
public static <DATATYPE extends ICloneable<DATATYPE>> DATATYPE getCloneIfNotNull(@Nullable
                                                                                 DATATYPE aObject)

Get a clone (= deep copy) of the passed value for all objects implementing ICloneable.

Type Parameters:

DATATYPE - The data type to be cloned

Parameters:

aObject - The object to be copied. May be null.

Returns:

null if the passed value is null or a clone of the object.

getGenericClonedList

@Nonnull
@ReturnsMutableCopy
public static <DATATYPE> ICommonsList<DATATYPE> getGenericClonedList(@Nullable
                                                                     Iterable<DATATYPE> aList)

Get a list where each contained item is also cloned. Like a deep copy.

Type Parameters:

DATATYPE - The list element type to be cloned

Parameters:

aList - Source list. May be null.

Returns:

The cloned list. Never null but maybe empty if the source list is empty.

getClonedList

@Nonnull
@ReturnsMutableCopy
public static <DATATYPE extends ICloneable<DATATYPE>> ICommonsList<DATATYPE> getClonedList(@Nullable
                                                                                           Iterable<DATATYPE> aList)

Get a list where each contained item is also cloned. Like a deep copy.

Type Parameters:

DATATYPE - The set element type to be cloned

Parameters:

aList - Source list. May be null.

Returns:

The cloned list. Never null but maybe empty if the source list is empty.