org.jgrasstools.gears.io.grasslegacy.utils.FileUtilities Maven / Gradle / Ivy
/*
* JGrass - Free Open Source Java GIS http://www.jgrass.org
* (C) HydroloGIS - www.hydrologis.com
*
* 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 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
* Various file utilities usefull when dealing with bytes, bits and numbers
*
*
* @author Andrea Antonello - www.hydrologis.com
* @since 1.1.0
*/
public class FileUtilities {
public FileUtilities() {
}
public static byte[] double2bytearray( double rastervalue ) {
long l = Double.doubleToLongBits(rastervalue);
byte[] b = new byte[8];
int shift = 64 - 8;
for( int k = 0; k < 8; k++, shift -= 8 ) {
b[k] = (byte) (l >>> shift);
}
return b;
}
public static BitSet fromByteArray( byte[] bytes ) {
BitSet bits = new BitSet();
for( int i = 0; i < bytes.length * 8; i++ ) {
if ((bytes[bytes.length - i / 8 - 1] & (1 << (i % 8))) > 0) {
bits.set(i);
}
}
return bits;
}
public static BitSet fromByte( byte thebyte ) {
BitSet bits = new BitSet();
for( int i = 0; i < 8; i++ ) {
if ((thebyte & (1 << (i % 8))) > 0) {
bits.set(i);
}
}
return bits;
}
public static byte[] BitSet2ByteArray( BitSet bs ) {
byte[] bytes = new byte[bs.size() / 8 + 1];
for( int i = 0; i < bs.size(); i++ )
if (bs.get(i))
bytes[i / 8] |= 1 << (i % 8);
return bytes;
}
public static byte[] toByteArray( BitSet bits ) {
byte[] bytes = new byte[bits.length() / 8 + 1];
for( int i = 0; i < bits.length(); i++ ) {
if (bits.get(i)) {
bytes[bytes.length - i / 8 - 1] |= 1 << (i % 8);
}
}
return bytes;
}
public static void copyFile( String fromFile, String toFile ) {
File in = new File(fromFile);
File out = new File(toFile);
copyFile(in, out);
}
public static void copyFile( File in, File out ) {
try {
FileInputStream fis = new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);
byte[] buf = new byte[1024];
int i = 0;
while( (i = fis.read(buf)) != -1 ) {
fos.write(buf, 0, i);
}
fis.close();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static float arr2float( byte[] arr, int start ) {
int i = 0;
int len = 4;
int cnt = 0;
byte[] tmp = new byte[len];
for( i = start; i < (start + len); i++ ) {
tmp[cnt] = arr[i];
cnt++;
}
int accum = 0;
i = 0;
for( int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) {
accum |= ((long) (tmp[i] & 0xff)) << shiftBy;
i++;
}
return Float.intBitsToFloat(accum);
}
public static int arr2int( byte[] arr, int start ) {
int low = arr[start] & 0xff;
int high = arr[start + 1] & 0xff;
return (int) (high << 8 | low);
}
public static long arr2long( byte[] arr, int start ) {
int i = 0;
int len = 4;
int cnt = 0;
byte[] tmp = new byte[len];
for( i = start; i < (start + len); i++ ) {
tmp[cnt] = arr[i];
cnt++;
}
long accum = 0;
i = 0;
for( int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) {
accum |= ((long) (tmp[i] & 0xff)) << shiftBy;
i++;
}
return accum;
}
public static double arr2double( byte[] arr, int start ) {
int i = 0;
int len = 8;
int cnt = 0;
byte[] tmp = new byte[len];
for( i = start; i < (start + len); i++ ) {
tmp[cnt] = arr[i];
cnt++;
}
long accum = 0;
i = 0;
for( int shiftBy = 0; shiftBy < 64; shiftBy += 8 ) {
accum |= ((long) (tmp[i] & 0xff)) << shiftBy;
i++;
}
return Double.longBitsToDouble(accum);
}
/**
* Returns true if all deletions were successful. If a deletion fails, the method stops
* attempting to delete and returns false.
*
* @param filehandle
* @return true if all deletions were successful
*/
public static boolean deleteFileOrDir( File filehandle ) {
if (filehandle.isDirectory()) {
String[] children = filehandle.list();
for( int i = 0; i < children.length; i++ ) {
boolean success = deleteFileOrDir(new File(filehandle, children[i]));
if (!success) {
return false;
}
}
}
// The directory is now empty so delete it
boolean isdel = filehandle.delete();
if (!isdel) {
// if it didn't work, which often happens on windows systems,
// remove on exit
filehandle.deleteOnExit();
}
return isdel;
}
/**
* Delete file or folder recursively on exit of the program
*
* @param filehandle
* @return true if all went well
*/
public static boolean deleteFileOrDirOnExit( File filehandle ) {
if (filehandle.isDirectory()) {
String[] children = filehandle.list();
for( int i = 0; i < children.length; i++ ) {
boolean success = deleteFileOrDir(new File(filehandle, children[i]));
if (!success) {
return false;
}
}
}
filehandle.deleteOnExit();
return true;
}
/**
* Read from an inoutstream and convert the readed stuff to a String. Usefull for text files
* that are available as streams.
*
* @param inputStream
* @return the read string
*/
public static String readInputStreamToString( InputStream inputStream ) {
try {
// Create the byte list to hold the data
List bytesList = new ArrayList();
byte b = 0;
while( (b = (byte) inputStream.read()) != -1 ) {
bytesList.add(b);
}
// Close the input stream and return bytes
inputStream.close();
byte[] bArray = new byte[bytesList.size()];
for( int i = 0; i < bArray.length; i++ ) {
bArray[i] = bytesList.get(i);
}
String file = new String(bArray);
return file;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
public static String replaceBackSlashes( String path ) {
return path.replaceAll("\\\\", "\\\\\\\\");
}
public static String getNameWithoutExtention( File file ) {
String name = file.getName();
int lastDot = name.lastIndexOf(".");
name = name.substring(0, lastDot);
return name;
}
} // end of class
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