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package com.wireguard.android.bindings;
import android.content.Context;
import android.databinding.DataBindingUtil;
import android.databinding.ObservableMap;
import android.databinding.ViewDataBinding;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import com.wireguard.android.BR;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collections;
/**
* A generic ListAdapter backed by a TreeMap that adds observability.
*/
public class ObservableMapAdapter<K extends Comparable<K>, V> extends BaseAdapter
implements ListAdapter {
private final OnMapChangedCallback<K, V> callback = new OnMapChangedCallback<>(this);
private ArrayList<K> keys;
private final int layoutId;
private final LayoutInflater layoutInflater;
private ObservableSortedMap<K, V> map;
ObservableMapAdapter(final Context context, final int layoutId,
final ObservableSortedMap<K, V> map) {
this.layoutId = layoutId;
layoutInflater = LayoutInflater.from(context);
setMap(map);
}
@Override
public int getCount() {
return map != null ? map.size() : 0;
}
@Override
public V getItem(final int position) {
if (map == null || position < 0 || position >= map.size())
return null;
return map.get(getKey(position));
}
@Override
public long getItemId(final int position) {
if (map == null || position < 0 || position >= map.size())
return -1;
return getItem(position).hashCode();
}
private K getKey(final int position) {
return getKeys().get(position);
}
private ArrayList<K> getKeys() {
if (keys == null)
keys = new ArrayList<>(map.keySet());
return keys;
}
public int getPosition(final K key) {
if (map == null || key == null)
return -1;
return Collections.binarySearch(getKeys(), key);
}
@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
ViewDataBinding binding = DataBindingUtil.getBinding(convertView);
if (binding == null)
binding = DataBindingUtil.inflate(layoutInflater, layoutId, parent, false);
binding.setVariable(BR.key, getKey(position));
binding.setVariable(BR.item, getItem(position));
binding.executePendingBindings();
return binding.getRoot();
}
@Override
public boolean hasStableIds() {
return true;
}
void setMap(final ObservableSortedMap<K, V> newMap) {
if (map != null)
map.removeOnMapChangedCallback(callback);
keys = null;
map = newMap;
if (map != null) {
map.addOnMapChangedCallback(callback);
}
notifyDataSetChanged();
}
private static class OnMapChangedCallback<K extends Comparable<K>, V>
extends ObservableMap.OnMapChangedCallback<ObservableSortedMap<K, V>, K, V> {
private final WeakReference<ObservableMapAdapter<K, V>> weakAdapter;
private OnMapChangedCallback(final ObservableMapAdapter<K, V> adapter) {
weakAdapter = new WeakReference<>(adapter);
}
@Override
public void onMapChanged(final ObservableSortedMap<K, V> sender, final K key) {
final ObservableMapAdapter<K, V> adapter = weakAdapter.get();
if (adapter != null) {
adapter.keys = null;
adapter.notifyDataSetChanged();
} else {
sender.removeOnMapChangedCallback(this);
}
}
}
}
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