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OpenGL vector map library written in Java - running on Android, iOS, Desktop and within the browser.
There is a newer version: 0.22.0
/*
 * Copyright 2013 Hannes Janetzek
 *
 * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see .
 */
package org.oscim.layers.tile;

import org.oscim.backend.canvas.Bitmap;
import org.oscim.core.MapElement;
import org.oscim.tiling.ITileDataSink;
import org.oscim.tiling.QueryResult;
import org.oscim.utils.PausableThread;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.oscim.tiling.QueryResult.FAILED;
import static org.oscim.tiling.QueryResult.SUCCESS;

public abstract class TileLoader extends PausableThread implements ITileDataSink {

    static final Logger log = LoggerFactory.getLogger(TileLoader.class);

    private static int id;

    private final String THREAD_NAME;
    private final TileManager mTileManager;

    /**
     * currently processed tile
     */
    protected MapTile mTile;

    public TileLoader(TileManager tileManager) {
        super();
        mTileManager = tileManager;
        THREAD_NAME = "TileLoader" + (id++);
    }

    protected abstract boolean loadTile(MapTile tile);

    public void go() {
        synchronized (this) {
            notify();
        }
    }

    @Override
    protected void doWork() {
        mTile = mTileManager.getTileJob();

        if (mTile == null)
            return;

        try {
            loadTile(mTile);
        } catch (Exception e) {
            e.printStackTrace();
            completed(FAILED);
        }
    }

    @Override
    protected String getThreadName() {
        return THREAD_NAME;
    }

    @Override
    protected int getThreadPriority() {
        return (Thread.NORM_PRIORITY + Thread.MIN_PRIORITY) / 2;
    }

    @Override
    protected boolean hasWork() {
        return mTileManager.hasTileJobs();
    }

    public abstract void dispose();

    public abstract void cancel();

    /**
     * Callback to be called by TileDataSource when finished
     * loading or on failure. MUST BE CALLED IN ANY CASE!
     */
    @Override
    public void completed(QueryResult result) {
        boolean ok = (result == SUCCESS);

        if (ok && (isCanceled() || isInterrupted()))
            result = QueryResult.FAILED;

        mTileManager.jobCompleted(mTile, result);
        mTile = null;
    }

    /**
     * Called by TileDataSource
     */
    @Override
    public void process(MapElement element) {

    }

    /**
     * Called by TileDataSource
     */
    @Override
    public void setTileImage(Bitmap bitmap) {

    }
}