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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.databinding;
import android.support.v4.util.Pools;
/**
* Utility class for managing ObservableList callbacks.
*/
public class ListChangeRegistry
extends
CallbackRegistry<ObservableList.OnListChangedCallback, ObservableList,
ListChangeRegistry.ListChanges> {
private static final Pools.SynchronizedPool<ListChanges> sListChanges =
new Pools.SynchronizedPool<ListChanges>(10);
private static final int ALL = 0;
private static final int CHANGED = 1;
private static final int INSERTED = 2;
private static final int MOVED = 3;
private static final int REMOVED = 4;
private static final CallbackRegistry.NotifierCallback<ObservableList.OnListChangedCallback,
ObservableList, ListChanges> NOTIFIER_CALLBACK = new CallbackRegistry.NotifierCallback<
ObservableList.OnListChangedCallback, ObservableList, ListChanges>() {
@Override
public void onNotifyCallback(ObservableList.OnListChangedCallback callback,
ObservableList sender, int notificationType, ListChanges listChanges) {
switch (notificationType) {
case CHANGED:
callback.onItemRangeChanged(sender, listChanges.start, listChanges.count);
break;
case INSERTED:
callback.onItemRangeInserted(sender, listChanges.start, listChanges.count);
break;
case MOVED:
callback.onItemRangeMoved(sender, listChanges.start, listChanges.to,
listChanges.count);
break;
case REMOVED:
callback.onItemRangeRemoved(sender, listChanges.start, listChanges.count);
break;
default:
callback.onChanged(sender);
break;
}
}
};
/**
* Notify registered callbacks that there was an unknown or whole-list change.
*
* @param list The list that changed.
*/
public void notifyChanged(ObservableList list) {
notifyCallbacks(list, ALL, null);
}
/**
* Notify registered callbacks that some elements have changed.
*
* @param list The list that changed.
* @param start The index of the first changed element.
* @param count The number of changed elements.
*/
public void notifyChanged(ObservableList list, int start, int count) {
ListChanges listChanges = acquire(start, 0, count);
notifyCallbacks(list, CHANGED, listChanges);
}
/**
* Notify registered callbacks that elements were inserted.
*
* @param list The list that changed.
* @param start The index where the elements were inserted.
* @param count The number of elements that were inserted.
*/
public void notifyInserted(ObservableList list, int start, int count) {
ListChanges listChanges = acquire(start, 0, count);
notifyCallbacks(list, INSERTED, listChanges);
}
/**
* Notify registered callbacks that elements were moved.
*
* @param list The list that changed.
* @param from The index of the first element moved.
* @param to The index of where the element was moved to.
* @param count The number of elements moved.
*/
public void notifyMoved(ObservableList list, int from, int to, int count) {
ListChanges listChanges = acquire(from, to, count);
notifyCallbacks(list, MOVED, listChanges);
}
/**
* Notify registered callbacks that elements were deleted.
*
* @param list The list that changed.
* @param start The index of the first element to be removed.
* @param count The number of elements removed.
*/
public void notifyRemoved(ObservableList list, int start, int count) {
ListChanges listChanges = acquire(start, 0, count);
notifyCallbacks(list, REMOVED, listChanges);
}
private static ListChanges acquire(int start, int to, int count) {
ListChanges listChanges = sListChanges.acquire();
if (listChanges == null) {
listChanges = new ListChanges();
}
listChanges.start = start;
listChanges.to = to;
listChanges.count = count;
return listChanges;
}
@Override
public synchronized void notifyCallbacks(ObservableList sender, int notificationType,
ListChanges listChanges) {
super.notifyCallbacks(sender, notificationType, listChanges);
if (listChanges != null) {
sListChanges.release(listChanges);
}
}
public ListChangeRegistry() {
super(NOTIFIER_CALLBACK);
}
static class ListChanges {
public int start;
public int count;
public int to;
}
}
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