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/*
* This file is part of WebLookAndFeel library.
*
* WebLookAndFeel library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WebLookAndFeel library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WebLookAndFeel library. If not, see commons;
/**
* Unknown object types case resolver.
* It is used to resolve clone outcome when cloned objects are not supported by behaviors.
*
* @see UnknownResolver
*/
@NotNull
private final UnknownResolver unknownResolver;
/**
* List of behaviors taking part in this clone algorithm instance.
* These behaviors define which object types can actually be clone and which ones will simply be retained.
*
* @see GlobalCloneBehavior
*/
@NotNull
private final List behaviors;
/**
* Constructs new {@link Clone} algorithm.
*
* @param unknownResolver unknown object types case resolver
* @param behaviors behaviors taking part in this clone algorithm instance
*/
public Clone ( @NotNull final UnknownResolver unknownResolver, @NotNull final GlobalCloneBehavior... behaviors )
{
this ( unknownResolver, new ImmutableList ( behaviors ) );
}
/**
* Constructs new {@link Clone} algorithm.
*
* @param unknownResolver unknown object types case resolver
* @param behaviors behaviors taking part in this clone algorithm instance
*/
public Clone ( @NotNull final UnknownResolver unknownResolver, @NotNull final List behaviors )
{
this.unknownResolver = unknownResolver;
this.behaviors = behaviors instanceof ImmutableList ? behaviors : new ImmutableList ( behaviors );
}
/**
* Returns clone of the specified object.
* New {@link Clone.InternalClone} instance is used for every separate clone operation.
* That is necessary because {@link Clone.InternalClone} stores cloned object references internally to preserve object links.
*
* @param object object to clone, should never be {@code null}
* @param cloned object type
* @return clone of the specified object
*/
@Nullable
public T clone ( @Nullable final T object )
{
return new InternalClone ().clone ( object, 0 );
}
/**
* Returns non-{@code null} clone of the specified object.
* New {@link Clone.InternalClone} instance is used for every separate clone operation.
* That is necessary because {@link Clone.InternalClone} stores cloned object references internally to preserve object links.
*
* @param object object to clone, should never be {@code null}
* @param cloned object type
* @return non-{@code null} clone of the specified object
*/
@NotNull
public T nonNullClone ( @NotNull final T object )
{
final T clone = clone ( object );
if ( clone == null )
{
throw new CloneException ( "Object clone is null: " + object );
}
return clone;
}
/**
* {@link RecursiveClone} implementation providing access to different {@link Clone} methods.
* It is used to process recursive clone calls differently from how public {@link RecursiveClone#clone(Object, int)} processes them.
*/
private class InternalClone extends AbstractRecursiveClone
{
@Nullable
@Override
public T clone ( @Nullable final T object, final int depth )
{
final T result;
if ( object != null )
{
// Checking cached copy references
final Object cached = retrieve ( object );
if ( cached == null )
{
// Trying to find fitting clone behavior
Object cloneResult = null;
GlobalCloneBehavior resultBehavior = null;
for ( final GlobalCloneBehavior behavior : behaviors )
{
// Checking that behavior supports object
if ( behavior.supports ( this, object ) )
{
// Executing clone behavior
cloneResult = behavior.clone ( this, object, depth );
resultBehavior = behavior;
break;
}
}
// Resolving result object
if ( resultBehavior != null )
{
// Result acquired
result = ( T ) cloneResult;
// Storing object if it not root
if ( depth > 0 && resultBehavior.isStorable () )
{
store ( object, result );
}
}
else
{
// Unknown type, trying to resolve it
result = ( T ) unknownResolver.resolve ( this, object );
// Storing object if it not root
if ( depth > 0 )
{
store ( object, result );
}
}
}
else
{
// Returning cached copy reference
result = ( T ) cached;
}
}
else
{
// Result is null
result = null;
}
return result;
}
@NotNull
@Override
public T cloneFields ( @NotNull final T object, final int depth )
{
for ( final GlobalCloneBehavior behavior : behaviors )
{
if ( behavior instanceof ReflectionCloneBehavior && behavior.supports ( this, object ) )
{
return ( T ) behavior.clone ( this, object, depth );
}
}
throw new CloneException ( "There is no ReflectionCloneBehavior in Clone algorithm" );
}
}
/**
* Returns {@link Clone} algorithm that is able to clone basic object types as well as simple {@link Collection}s and {@link Map}s.
* This algorithm is most useful for cases when you don't want to clone any unwanted objects and only focus on few basic types and
* some extra types which have strictly defined clone behavior through implementing {@link CloneBehavior}.
*
* @return {@link Clone} algorithm that is able to clone basic object types as well as simple {@link Collection}s and {@link Map}s
*/
@NotNull
public static Clone basic ()
{
final String identifier = "basic";
Clone clone = commonInstance ( identifier );
if ( clone == null )
{
clone = new Clone (
new ExceptionUnknownResolver (),
new BasicCloneBehavior (),
new RedefinedCloneBehavior (),
new ArrayCloneBehavior (),
new MapCloneBehavior (),
new SetCloneBehavior (),
new CollectionCloneBehavior ()
);
getCommons ().put ( identifier, clone );
}
return clone;
}
/**
* Returns {@link Clone} algorithm that can also clone custom objects through {@link ReflectionCloneBehavior}.
* Be careful when using this clone algorithm as it will go through all object references and will clone any existing fields.
* This algorithm is most useful for cases of cloning complex multi-level structures of objects where defining every clone operation
* can be difficult and vulnerable to mistakes.
*
* @return {@link Clone} algorithm that can also clone custom objects through {@link ReflectionCloneBehavior}
*/
@NotNull
public static Clone deep ()
{
final String identifier = "deep";
Clone clone = commonInstance ( identifier );
if ( clone == null )
{
clone = new Clone (
new ExceptionUnknownResolver (),
new BasicCloneBehavior (),
new RedefinedCloneBehavior (),
new ArrayCloneBehavior (),
new MapCloneBehavior (),
new SetCloneBehavior (),
new CollectionCloneBehavior (),
new ReflectionCloneBehavior ( ReflectionCloneBehavior.Policy.cloneable, ModifierType.STATIC )
);
getCommons ().put ( identifier, clone );
}
return clone;
}
/**
* Returns {@link Clone} algorithm similar to {@link #deep()} but also allows non-{@link Cloneable} objects to be cloned.
* Be careful when using this clone algorithm as it will go through all object references and will clone any existing fields.
* Just like {@link #deep()} clone algorithm this one is most useful for cloning complex multi-level structures of objects while also
* honoring base {@link Object#clone()} API while going through the structure of objects.
*
* @return {@link Clone} algorithm similar to {@link #deep()} that also uses base {@link Object#clone()} API
*/
@NotNull
public static Clone reflective ()
{
final String identifier = "reflective";
Clone clone = commonInstance ( identifier );
if ( clone == null )
{
clone = new Clone (
new ExceptionUnknownResolver (),
new BasicCloneBehavior (),
new RedefinedCloneBehavior (),
new ArrayCloneBehavior (),
new MapCloneBehavior (),
new SetCloneBehavior (),
new CollectionCloneBehavior (),
new ReflectionCloneBehavior ( ReflectionCloneBehavior.Policy.all, ModifierType.STATIC )
);
getCommons ().put ( identifier, clone );
}
return clone;
}
/**
* Returns common {@link Clone} instance by its indentifier.
*
* @param identifier {@link Clone} instance indentifier
* @return common {@link Clone} instance by its indentifier
*/
@Nullable
private static Clone commonInstance ( @NotNull final String identifier )
{
return getCommons ().get ( identifier );
}
/**
* Returns common instances {@link Map}.
*
* @return common instances {@link Map}
*/
@NotNull
private static Map getCommons ()
{
if ( commons == null )
{
synchronized ( Clone.class )
{
if ( commons == null )
{
commons = new ConcurrentHashMap ( 4 );
}
}
}
return commons;
}
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