edu.columbia.sel.grout.util.TileUtils.java Source code

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Here is the source code for edu.columbia.sel.grout.util.TileUtils.java

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/**
 * 
 * Copyright (c) 2014 Jonathan Wohl, Sustainable Engineering Lab, Columbia University
 * 
 * See the file LICENSE for copying permission.
 * 
 */
package edu.columbia.sel.grout.util;

import java.io.File;

import org.apache.commons.io.FileUtils;

import edu.columbia.sel.grout.OSMTileInfo;
import android.util.Log;

public class TileUtils {

    private static final String TAG = TileUtils.class.getCanonicalName();

    // ===========================================================
    // Constants
    // ===========================================================

    // ===========================================================
    // Fields
    // ===========================================================

    // ===========================================================
    // Constructors
    // ===========================================================

    // ===========================================================
    // Getter & Setter
    // ===========================================================

    // ===========================================================
    // Methods from SuperClass/Interfaces
    // ===========================================================

    // ===========================================================
    // Methods
    // ===========================================================

    /**
     * For a description see:
     * 
     * @see http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames For a
     *      code-description see:
     * @see http://wiki.openstreetmap.org/index.php/Slippy_map_tilenames#
     *      compute_bounding_box_for_tile_number
     * @param aLat
     *            latitude to get the {@link OSMTileInfo} for.
     * @param aLon
     *            longitude to get the {@link OSMTileInfo} for.
     * @return The {@link OSMTileInfo} providing 'x' 'y' and 'z'(oom) for the
     *         coordinates passed.
     */
    public static OSMTileInfo getMapTileFromCoordinates(final double aLat, final double aLon, final int zoom) {
        final int y = (int) Math
                .floor((1 - Math.log(Math.tan(aLat * Math.PI / 180) + 1 / Math.cos(aLat * Math.PI / 180)) / Math.PI)
                        / 2 * (1 << zoom));
        final int x = (int) Math.floor((aLon + 180) / 360 * (1 << zoom));

        return new OSMTileInfo(x, y, zoom);
    }

    /**
     * Recursively delete a directory and its contents. Returns true on succes, false otherwise.
     * @param dir
     * @return boolean
     */
    public static boolean deleteDirectory(File dir) {
        if (dir.exists()) {
            File[] files = dir.listFiles();
            if (files == null) {
                return true;
            }
            for (int i = 0; i < files.length; i++) {
                if (files[i].isDirectory()) {
                    deleteDirectory(files[i]);
                } else {
                    files[i].delete();
                }
            }
        }
        return (dir.delete());
    }

    /**
     * Returns the recursive total number of files in the specified directory.
     * @return int
     */
    public static int getTotalRecursiveFileCount(final File dir) {
        int tmpCnt = 0;
        if (!dir.exists()) {
            return tmpCnt;
        }
        final File[] children = dir.listFiles();
        for (final File c : children) {
            if (c.isDirectory()) {
                tmpCnt += getTotalRecursiveFileCount(c);
            } else {
                tmpCnt++;
            }
        }
        return tmpCnt;
    }

    // ===========================================================
    // Inner and Anonymous Classes
    // ===========================================================

}