1 package org.hedgewars.hedgeroid.netplay;

     2 

     3 import java.util.ArrayList;

     4 import java.util.Collections;

     5 import java.util.Comparator;

     6 import java.util.List;

     7 

     8 import android.database.DataSetObserver;

     9 import android.widget.BaseAdapter;

    10 

    11 public abstract class ObservableTreeMapAdapter<K,V> extends BaseAdapter {

    12 	private boolean sourceChanged = true;

    13 	private List<V> entries = new ArrayList<V>();

    14 	private ObservableTreeMap<K, V> source;

    15 	

    16 	private DataSetObserver observer = new DataSetObserver() {

    17 		@Override

    18 		public void onChanged() {

    19 			sourceChanged = true;

    20 			notifyDataSetChanged();

    21 		}

    22 		

    23 		@Override

    24 		public void onInvalidated() {

    25 			invalidate();

    26 		}

    27 	};

    28 	

    29 	abstract protected Comparator<V> getEntryOrder();

    30 	

    31 	protected List<V> getEntries() {

    32 		if(sourceChanged) {

    33 			entries.clear();

    34 			entries.addAll(source.getMap().values());

    35 			Collections.sort(entries, getEntryOrder());

    36 			sourceChanged = false;

    37 		}

    38 		return entries;

    39 	}

    40 	

    41 	public int getCount() {

    42 		return getEntries().size();

    43 	}

    44 

    45 	public void setSource(ObservableTreeMap<K,V> source) {

    46 		if(this.source != null) {

    47 			this.source.unregisterObserver(observer);

    48 		}

    49 		this.source = source;

    50 		this.source.registerObserver(observer);

    51 		sourceChanged = true;

    52 		notifyDataSetChanged();

    53 	}

    54 	

    55 	public void invalidate() {

    56 		if(source != null) {

    57 			source.unregisterObserver(observer);

    58 		}

    59 		source = null;

    60 		notifyDataSetInvalidated();

    61 	}

    62 }