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MicroStream Persistence Binary Data Extension
package one.microstream.persistence.binary.java.util;
/*-
* #%L
* microstream-persistence-binary
* %%
* Copyright (C) 2019 - 2021 MicroStream Software
* %%
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the Eclipse
* Public License, v. 2.0 are satisfied: GNU General Public License, version 2
* with the GNU Classpath Exception which is
* available at https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
* #L%
*/
import java.util.Comparator;
import java.util.PriorityQueue;
import one.microstream.X;
import one.microstream.collections.old.OldCollections;
import one.microstream.persistence.binary.internal.AbstractBinaryHandlerCustomIterable;
import one.microstream.persistence.binary.types.Binary;
import one.microstream.persistence.types.PersistenceFunction;
import one.microstream.persistence.types.PersistenceLoadHandler;
import one.microstream.persistence.types.PersistenceReferenceLoader;
import one.microstream.persistence.types.PersistenceStoreHandler;
public final class BinaryHandlerPriorityQueue
extends AbstractBinaryHandlerCustomIterable>
{
///////////////////////////////////////////////////////////////////////////
// constants //
//////////////
static final long BINARY_OFFSET_COMPARATOR = 0;
static final long BINARY_OFFSET_ELEMENTS = BINARY_OFFSET_COMPARATOR + Binary.objectIdByteLength();
///////////////////////////////////////////////////////////////////////////
// static methods //
///////////////////
@SuppressWarnings({"unchecked", "rawtypes"})
private static Class> handledType()
{
return (Class)PriorityQueue.class; // no idea how to get ".class" to work otherwise
}
@SuppressWarnings("unchecked")
private static Comparator getComparator(
final Binary data ,
final PersistenceLoadHandler handler
)
{
return (Comparator)handler.lookupObject(data.read_long(BINARY_OFFSET_COMPARATOR));
}
static final int getElementCount(final Binary data)
{
return X.checkArrayRange(data.getListElementCountReferences(BINARY_OFFSET_ELEMENTS));
}
public static BinaryHandlerPriorityQueue New()
{
return new BinaryHandlerPriorityQueue();
}
///////////////////////////////////////////////////////////////////////////
// constructors //
/////////////////
BinaryHandlerPriorityQueue()
{
super(
handledType(),
SimpleArrayFields(
CustomField(Comparator.class, "comparator")
)
);
}
///////////////////////////////////////////////////////////////////////////
// methods //
////////////
@Override
public final void store(
final Binary data ,
final PriorityQueue instance,
final long objectId,
final PersistenceStoreHandler handler
)
{
// store elements simply as array binary form
data.storeIterableAsList(
this.typeId() ,
objectId ,
BINARY_OFFSET_ELEMENTS,
instance ,
instance.size() ,
handler
);
data.store_long(
BINARY_OFFSET_COMPARATOR,
handler.apply(instance.comparator())
);
}
@Override
public final PriorityQueue create(
final Binary data ,
final PersistenceLoadHandler handler
)
{
return new PriorityQueue<>(
Math.max(
1, // initialCapacity cannot be smaller than 1
X.checkArrayRange(getElementCount(data))
),
getComparator(data, handler)
);
}
@Override
public final void updateState(
final Binary data ,
final PriorityQueue instance,
final PersistenceLoadHandler handler
)
{
instance.clear();
/*
* Tree collections don't use hashing, but their comparing logic still uses the elements' state,
* which might not yet be available when this method is called. Hence the detour to #complete.
*/
final Object[] elementsHelper = new Object[getElementCount(data)];
data.collectElementsIntoArray(BINARY_OFFSET_ELEMENTS, handler, elementsHelper);
data.registerHelper(instance, elementsHelper);
}
@Override
public final void complete(
final Binary data ,
final PriorityQueue instance,
final PersistenceLoadHandler handler
)
{
OldCollections.populateCollectionFromHelperArray(instance, data.getHelper(instance));
}
@Override
public final void iterateInstanceReferences(
final PriorityQueue instance,
final PersistenceFunction iterator
)
{
iterator.apply(instance.comparator());
super.iterateInstanceReferences(instance, iterator);
}
@Override
public final void iterateLoadableReferences(final Binary data, final PersistenceReferenceLoader iterator)
{
iterator.acceptObjectId(data.read_long(BINARY_OFFSET_COMPARATOR));
data.iterateListElementReferences(BINARY_OFFSET_ELEMENTS, iterator);
}
}