Java tutorial
//$HeadURL$ /*---------------------------------------------------------------------------- This file is part of deegree, http://deegree.org/ Copyright (C) 2001-2009 by: Department of Geography, University of Bonn and lat/lon GmbH This library 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 2.1 of the License, or (at your option) any later version. This library 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 library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Contact information: lat/lon GmbH Aennchenstr. 19, 53177 Bonn Germany http://lat-lon.de/ Department of Geography, University of Bonn Prof. Dr. Klaus Greve Postfach 1147, 53001 Bonn Germany http://www.geographie.uni-bonn.de/deegree/ e-mail: info@deegree.org ----------------------------------------------------------------------------*/ package org.deegree.coverage.tools; import java.io.File; import java.io.FileFilter; import java.nio.ByteBuffer; import java.util.LinkedList; import java.util.List; import org.apache.commons.cli.ParseException; import org.deegree.coverage.raster.interpolation.InterpolationType; import org.deegree.geometry.Envelope; import org.deegree.geometry.GeometryFactory; /** * This class contains some static convenience methods for raster commandline tools. * * @author <a href="mailto:tonnhofer@lat-lon.de">Oliver Tonnhofer</a> * @author last edited by: $Author$ * * @version $Revision$, $Date$ */ public class RasterCommandUtils { /** * Returns an InterpolationType for a string shortcut. * * @param type * bl or nn * @return the interpolation type * @throws ParseException * if the type is not supported */ public static InterpolationType getInterpolationType(String type) throws ParseException { if (type == null) { return InterpolationType.NEAREST_NEIGHBOR; // default } if (type.equalsIgnoreCase("bl")) { return InterpolationType.BILINEAR; } if (type.equalsIgnoreCase("nn")) { return InterpolationType.NEAREST_NEIGHBOR; } throw new ParseException("interpolation type " + type + " is not supported"); } /** * Retruns an envelope for given bbox string. * * @param bbox * comma separated bbox * @return the parsed envelope * @throws ParseException * if the bbox is invalid */ public static Envelope parseBBOX(String bbox) throws ParseException { String[] parts = bbox.split(","); float[] coords = new float[4]; try { for (int i = 0; i < 4; i++) { coords[i] = Float.parseFloat(parts[i]); } } catch (IndexOutOfBoundsException ex) { throw new ParseException("invalid bbox '" + bbox + "' doesn't contain four values"); } catch (NumberFormatException ex) { throw new ParseException("invalid bbox '" + bbox + "' doesn't contain four float values"); } GeometryFactory geomFactory = new GeometryFactory(); Envelope result = geomFactory.createEnvelope(new double[] { coords[0], coords[1] }, new double[] { coords[2], coords[3] }, null); return result; } /** * Parse a background value which is either a 0xdecafbad hex value or a float value. Float values will be returned * as a 4-byte array. * * @param background * @return a byte array with the parsed value * @throws ParseException */ public static byte[] parseBackgroundValue(String background) throws ParseException { if (background.toLowerCase().startsWith("0x")) { byte[] result = null; String hexValues = background.substring(2); try { if (hexValues.length() == 3 || hexValues.length() == 4) { result = new byte[hexValues.length()]; for (int i = 0; i < result.length; i++) { result[i] = parseHexToByte("" + hexValues.charAt(i) + hexValues.charAt(i)); } } else if (hexValues.length() == 6 || hexValues.length() == 8) { result = new byte[hexValues.length() / 2]; for (int i = 0; i < result.length; i++) { result[i] = parseHexToByte("" + hexValues.charAt(i * 2) + hexValues.charAt(i * 2 + 1)); } } else { throw new ParseException("not a valid hex color value (like 0xff0, or 0x0ab4f8)"); } } catch (NumberFormatException ex) { throw new ParseException("not a valid hex color value (like 0xff0, or 0x0ab4f8)"); } return result; } ByteBuffer tmp = ByteBuffer.allocate(4); tmp.putFloat(Float.parseFloat(background)); return tmp.array(); } private static byte parseHexToByte(String hex) { return (byte) (0xff & Integer.parseInt(hex, 16)); } /** * Get all files from the given location(s). * * @param args * array with file and directory names. * @param recurse recurse into all directories * @param fileExt only get files with the given file suffix * @return a list with all given files and all files in the given directories. */ public static List<File> getAllFiles(String[] args, boolean recurse, final String fileExt) { List<File> result = new LinkedList<File>(); for (String filename : args) { result.addAll(getFiles(new File(filename), recurse, new FileFilter() { public boolean accept(File pathname) { return pathname.getName().endsWith(fileExt); } })); } return result; } /** * Get all files from the given location(s). * * @param args * array with file and directory names. * @param recurse recurse into all directories * @return a list with all given files and all files in the given directories. */ public static List<File> getAllFiles(String[] args, boolean recurse) { return getAllFiles(args, recurse, ""); } private static List<File> getFiles(File root, boolean recurse, FileFilter fileFilter) { List<File> result = new LinkedList<File>(); if (root.isDirectory()) { for (File file : root.listFiles()) { if (file.isDirectory() && recurse) { result.addAll(getFiles(file, recurse, fileFilter)); } else if (file.isFile() && fileFilter.accept(file)) { result.add(file); } } } else { result.add(root); } return result; } }