/*
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* Copyright 2011 Yuri Kanivets
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.codbking.widget.adapters;
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import android.database.DataSetObserver;
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import android.view.View;
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import android.view.ViewGroup;
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import java.util.LinkedList;
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import java.util.List;
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/**
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* Abstract Wheel adapter.
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*/
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public abstract class AbstractWheelAdapter implements WheelViewAdapter {
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// Observers
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private List<DataSetObserver> datasetObservers;
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@Override
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public View getEmptyItem(View convertView, ViewGroup parent) {
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return null;
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}
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@Override
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public void registerDataSetObserver(DataSetObserver observer) {
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if (datasetObservers == null) {
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datasetObservers = new LinkedList<DataSetObserver>();
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}
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datasetObservers.add(observer);
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}
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@Override
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public void unregisterDataSetObserver(DataSetObserver observer) {
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if (datasetObservers != null) {
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datasetObservers.remove(observer);
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}
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}
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/**
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* Notifies observers about data changing
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*/
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protected void notifyDataChangedEvent() {
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if (datasetObservers != null) {
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for (DataSetObserver observer : datasetObservers) {
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observer.onChanged();
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}
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}
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}
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/**
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* Notifies observers about invalidating data
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*/
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protected void notifyDataInvalidatedEvent() {
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if (datasetObservers != null) {
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for (DataSetObserver observer : datasetObservers) {
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observer.onInvalidated();
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}
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}
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}
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}
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