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/*
* Copyright (C) 2014 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;
/**
* A convenience class that implements {@link android.databinding.Observable} interface and provides
* {@link #notifyPropertyChanged(int)} and {@link #notifyChange} methods.
*/
public class BaseObservable implements Observable {
private transient PropertyChangeRegistry mCallbacks;
public BaseObservable() {
}
@Override
public synchronized void addOnPropertyChangedCallback(OnPropertyChangedCallback callback) {
if (mCallbacks == null) {
mCallbacks = new PropertyChangeRegistry();
}
mCallbacks.add(callback);
}
@Override
public synchronized void removeOnPropertyChangedCallback(OnPropertyChangedCallback callback) {
if (mCallbacks != null) {
mCallbacks.remove(callback);
}
}
/**
* Notifies listeners that all properties of this instance have changed.
*/
public synchronized void notifyChange() {
if (mCallbacks != null) {
mCallbacks.notifyCallbacks(this, 0, null);
}
}
/**
* Notifies listeners that a specific property has changed. The getter for the property
* that changes should be marked with {@link Bindable} to generate a field in
* <code>BR</code> to be used as <code>fieldId</code>.
*
* @param fieldId The generated BR id for the Bindable field.
*/
public void notifyPropertyChanged(int fieldId) {
if (mCallbacks != null) {
mCallbacks.notifyCallbacks(this, fieldId, null);
}
}
}
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