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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 java.util.ArrayList;
import java.util.Collection;
/**
* An {@link ObservableList} implementation using ArrayList as an implementation.
*/
public class ObservableArrayList<T> extends ArrayList<T> implements ObservableList<T> {
private transient ListChangeRegistry mListeners = new ListChangeRegistry();
@Override
public void addOnListChangedCallback(OnListChangedCallback listener) {
if (mListeners == null) {
mListeners = new ListChangeRegistry();
}
mListeners.add(listener);
}
@Override
public void removeOnListChangedCallback(OnListChangedCallback listener) {
if (mListeners != null) {
mListeners.remove(listener);
}
}
@Override
public boolean add(T object) {
super.add(object);
notifyAdd(size() - 1, 1);
return true;
}
@Override
public void add(int index, T object) {
super.add(index, object);
notifyAdd(index, 1);
}
@Override
public boolean addAll(Collection<? extends T> collection) {
int oldSize = size();
boolean added = super.addAll(collection);
if (added) {
notifyAdd(oldSize, size() - oldSize);
}
return added;
}
@Override
public boolean addAll(int index, Collection<? extends T> collection) {
boolean added = super.addAll(index, collection);
if (added) {
notifyAdd(index, collection.size());
}
return added;
}
@Override
public void clear() {
int oldSize = size();
super.clear();
if (oldSize != 0) {
notifyRemove(0, oldSize);
}
}
@Override
public T remove(int index) {
T val = super.remove(index);
notifyRemove(index, 1);
return val;
}
@Override
public boolean remove(Object object) {
int index = indexOf(object);
if (index >= 0) {
remove(index);
return true;
} else {
return false;
}
}
@Override
public T set(int index, T object) {
T val = super.set(index, object);
if (mListeners != null) {
mListeners.notifyChanged(this, index, 1);
}
return val;
}
@Override
protected void removeRange(int fromIndex, int toIndex) {
super.removeRange(fromIndex, toIndex);
notifyRemove(fromIndex, toIndex - fromIndex);
}
private void notifyAdd(int start, int count) {
if (mListeners != null) {
mListeners.notifyInserted(this, start, count);
}
}
private void notifyRemove(int start, int count) {
if (mListeners != null) {
mListeners.notifyRemoved(this, start, count);
}
}
}
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