project_files/Android-build/SDL-android-project/src/org/hedgewars/hedgeroid/util/ObservableTreeMapAdapter.java
author koda
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/*
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 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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package org.hedgewars.hedgeroid.util;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import android.database.DataSetObserver;
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import android.widget.BaseAdapter;
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public abstract class ObservableTreeMapAdapter<K,V> extends BaseAdapter {
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    private boolean sourceChanged = true;
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    private List<V> entries = new ArrayList<V>();
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    private ObservableTreeMap<K, V> source;
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    private DataSetObserver observer = new DataSetObserver() {
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        @Override
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        public void onChanged() {
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            sourceChanged = true;
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            notifyDataSetChanged();
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        }
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        @Override
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        public void onInvalidated() {
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            invalidate();
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        }
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    };
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    abstract protected Comparator<V> getEntryOrder();
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    protected List<V> getEntries() {
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        if(sourceChanged) {
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            entries.clear();
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            entries.addAll(source.getMap().values());
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            Collections.sort(entries, getEntryOrder());
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            sourceChanged = false;
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        }
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        return entries;
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    }
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    public int getCount() {
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        return getEntries().size();
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    }
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    public V getItem(int position) {
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        return getEntries().get(position);
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    }
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    public long getItemId(int position) {
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        return position;
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    }
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    @Override
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    public boolean hasStableIds() {
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        return false;
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    }
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    public void setSource(ObservableTreeMap<K,V> source) {
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        if(this.source != null) {
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            this.source.unregisterObserver(observer);
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        }
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        this.source = source;
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        this.source.registerObserver(observer);
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        sourceChanged = true;
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        notifyDataSetChanged();
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    }
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    public void invalidate() {
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        if(source != null) {
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            source.unregisterObserver(observer);
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        }
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        source = null;
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        notifyDataSetInvalidated();
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    }
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}