public class Utility
+extends java.lang.Object
+| Modifier and Type | +Field and Description | +
|---|---|
static java.util.Random |
+rnd
+Object to get some random values...
+ |
+
static int |
+TCP_BUFFER_SIZE
+Default size for the TCP input stream
+ |
+
| Modifier and Type | +Method and Description | +
|---|---|
static java.lang.Float |
+bytesToFloat(byte[] bytes,
+ int offset,
+ int size)
+Returns a
+float value from array of bytes. |
+
static byte[] |
+calculateCRC(byte[] data,
+ int offset,
+ int len)
+Calculates and returns the CRC using the data passed in parameters.
+ |
+
static boolean |
+checkCRC(byte[] data,
+ int offset,
+ int len,
+ byte[] crc)
+Checks the CRC and returns true if it is correct, otherwise false.
+ |
+
static void |
+DEBUG(java.lang.String className,
+ java.lang.String method,
+ java.lang.String msg) |
+
static java.io.BufferedReader |
+fileParser(java.lang.String path,
+ java.lang.String fileName)
+Method to use to access a file in your resources folder...
+ |
+
static java.lang.String |
+getHexString(byte[] b)
+Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f).
+ |
+
static java.lang.String |
+getHexString(byte[] b,
+ int offset,
+ int length)
+Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f)
+ |
+
static java.lang.String |
+getStringRndVal(int factor)
+Retrieves a random value rounded to 2 decimal...
+ |
+
static java.lang.String |
+md5sum(java.lang.String msg)
+Returns the md5 of any input...
+ |
+
static byte[] |
+readBytes(java.io.InputStream in)
+Reads the incoming data from an input stream as long as there is something to read and saved the data in an array
+ of bytes.
+ |
+
static byte[] |
+readLine(java.io.InputStream in)
+Reads a line of text.
+ |
+
static byte[] |
+readNBytes(java.io.InputStream in,
+ int len)
+Reads from the given input stream an amount of bytes and retrieves these data as an array of bytes.
+ |
+
static void |
+sendBytes(java.io.OutputStream out,
+ byte[] toSend,
+ int offset,
+ int length)
+This method sends the content of the
+buffer to the given OutputStream. |
+
static int |
+unsignedByteToSignedInt(byte from)
+Converts an unsigned byte to a signed integer.
+ |
+
static void |
+waitSomeTime(int ms)
+To wait some times ...
+ |
+
static void |
+writeLine(java.io.OutputStream out,
+ byte[] toSend)
+Send the data contained in the given array of bytes through the output
+ stream.
+ |
+
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitpublic static final int TCP_BUFFER_SIZE+
public static java.util.Random rnd+
public static byte[] calculateCRC(byte[] data, + int offset, + int len)+
data - a byte array containing the data to sendoffset - the offsetlen - the data lengthpublic static boolean checkCRC(byte[] data, + int offset, + int len, + byte[] crc)+
data - a byte array containing the data to sendoffset - the offsetlen - the data lengthcrc - a byte array containing the CRC to checkpublic static int unsignedByteToSignedInt(byte from)+
from - an unsigned byte to convert to a signed integerpublic static java.lang.String getHexString(byte[] b)+
b - Array of bytes to be converted in HEX string.public static java.lang.String getHexString(byte[] b, + int offset, + int length)+
b - The byte array to convert in HEX stringoffset - The index where we start to convert from.length - The amount of bytes to convert in HEX stringpublic static java.lang.String getStringRndVal(int factor)+
factor - A coefficient which the random value is multiplied with.public static byte[] readBytes(java.io.InputStream in) + throws java.io.IOException+
in - The input Stream where to read the data coming from.array of bytes. Or null if the has been closed by the peer while
+ waiting for incoming data.java.io.IOException - If the first byte cannot be read for any reason other than the end of the file, if the input
+ stream has been closed, or if some other I/O error occurs.public static byte[] readNBytes(java.io.InputStream in, + int len) + throws java.io.IOException+
in - The input stream where to read the data coming from.len - The amount of data to readarray of bytes.java.io.IOException - If the first byte cannot be read for any reason other
+ than the end of the file, if the input stream has been
+ closed, or if some other I/O error occurs.public static byte[] readLine(java.io.InputStream in) + throws java.io.IOException+
in - The Input Stream to read from.java.io.IOException - If an I/O error occurspublic static void writeLine(java.io.OutputStream out, + byte[] toSend) + throws java.io.IOException+
out - The Output Stream to send the data to.toSend - The data to sendjava.io.IOException - If an I/O error occurspublic static void sendBytes(java.io.OutputStream out, + byte[] toSend, + int offset, + int length) + throws java.io.IOException+
buffer to the given OutputStream. This content is
+ specified by the starting position, defined by offset, and the amount of bytes,defined by
+ length. If an error occurs during this process, a exception will be raised.out - The Output Stream to send the data to.toSend - The data to sendoffset - The starting position in the buffer of datalength - The amount of bytes to be sent.java.io.IOException - If an I/O error occurspublic static void waitSomeTime(int ms)+
ms - The amount of time to wait expressed in milli-seconds [ms].public static java.lang.String md5sum(java.lang.String msg)+
msg - The input string to processpublic static java.lang.Float bytesToFloat(byte[] bytes, + int offset, + int size)+
float value from array of bytes. This byte's array can only be 2 or 4 bytes long.bytes - The array of bytes to convert.offset - The position where the method has to start to get the bytes from.size - The amount of bytes to convert.Float value or null if the process failed.public static java.io.BufferedReader fileParser(java.lang.String path, + java.lang.String fileName)+
path - folder's hierarchy (if exists) from `resources`fileName - Name of the file to accessBufferedReader related to the file you want to work with, or null if the file could not
+ be reached.public static void DEBUG(java.lang.String className, + java.lang.String method, + java.lang.String msg)+
| Class | +Description | +
|---|---|
| Utility | +
+ This class contains some useful Java methods to manipulate data.
+ |
+
| Modifier and Type | +Constant Field | +Value | +
|---|---|---|
+
+public static final int |
+TCP_BUFFER_SIZE |
+4096 |
+
Each package has a page that contains a list of its classes and interfaces, with a summary for each. This page can contain six categories:
+Each class, interface, nested class and nested interface has its own separate page. Each of these pages has three sections consisting of a class/interface description, summary tables, and detailed member descriptions:
+Each summary entry contains the first sentence from the detailed description for that item. The summary entries are alphabetical, while the detailed descriptions are in the order they appear in the source code. This preserves the logical groupings established by the programmer.
+Each annotation type has its own separate page with the following sections:
+Each enum has its own separate page with the following sections:
+There is a Class Hierarchy page for all packages, plus a hierarchy for each package. Each hierarchy page contains a list of classes and a list of interfaces. The classes are organized by inheritance structure starting with java.lang.Object. The interfaces do not inherit from java.lang.Object.
The Deprecated API page lists all of the API that have been deprecated. A deprecated API is not recommended for use, generally due to improvements, and a replacement API is usually given. Deprecated APIs may be removed in future implementations.
+The Index contains an alphabetic list of all classes, interfaces, constructors, methods, and fields.
+These links take you to the next or previous class, interface, package, or related page.
+These links show and hide the HTML frames. All pages are available with or without frames.
+The All Classes link shows all classes and interfaces except non-static nested types.
+Each serializable or externalizable class has a description of its serialization fields and methods. This information is of interest to re-implementors, not to developers using the API. While there is no link in the navigation bar, you can get to this information by going to any serialized class and clicking "Serialized Form" in the "See also" section of the class description.
+The Constant Field Values page lists the static final fields and their values.
+float value from array of bytes.buffer to the given OutputStream.float value from array of bytes. This byte's array can only be 2 or 4 bytes long.
+ * @param bytes The array of bytes to convert.
+ * @param offset The position where the method has to start to get the bytes from.
+ * @param size The amount of bytes to convert.
+ * @return A Float value or null if the process failed.
+ */
+ public static Float bytesToFloat(byte[] bytes, int offset, int size) {
+
+ if (size == 2 || size == 4) {
+ byte[] tmp = new byte[4];
+ System.arraycopy(bytes, offset, tmp, 0, size);
+ try {
+ return ByteBuffer.wrap(tmp).order(ByteOrder.BIG_ENDIAN).getFloat();
+ } catch (Exception e) {
+ DEBUG("utils", "Utility", "bytesToFloat()", "ByteBufferException : " + e.getMessage());
+ }
+ } else {
+ DEBUG("utils", "Utility", "bytesToFloat()", "ERROR: size MUST be 2 or 4 !!!");
+ }
+ return null;
+ }
+
+ /**
+ * Converts an unsigned byte to a signed integer.
+ *
+ * @param from an unsigned byte to convert to a signed integer
+ * @return int a signed integer
+ */
+ public static int unsignedByteToSignedInt(byte from)
+ {
+ return 0x000000FF & (int)from;
+ }
+
+ /**
+ * Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f)
+ * @param b The array of bytes to be convert in HEX characters.
+ * @return A string representing the given array of byte in HEX values.
+ */
+ public static String getHexString(byte[] b) {
+ return getHexString(b, 0, b.length);
+ }
+
+ /**
+ * Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f)
+ * @param b The byte array to convert in HEX string
+ * @param offset The index where we start to convert from.
+ * @param length The amount of bytes to convert in HEX string
+ * @return A String representing the HEX values of the selected bytes of the array.
+ */
+ public static String getHexString(byte[] b, int offset, int length) {
+ StringBuilder result = new StringBuilder();
+ for (int i = offset; i < offset+length; i++) {
+ result.append(Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1));
+ }
+ return result.toString();
+ }
+
+ /**
+ * Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f) and
+ * format the string with `0xCC` where CC is the string in HEX
+ * @param b The byte array to convert in HEX string
+ * @param offset The index where we start to convert from.
+ * @param length The amount of bytes to convert in HEX string
+ * @return A String representing the HEX values of the selected bytes of the array.
+ */
+ public static String getHexStringForDebug(byte[] b, int offset, int length) {
+ StringBuilder result = new StringBuilder();
+ for (int i = offset; i < offset+length; i++) {
+ result.append("0x");
+ result.append(Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1));
+ result.append(" ");
+ }
+ return result.toString().trim();
+ }
+
+
+ /**
+ * To be used to make a thread waiting for a certain amount of time
+ * @param thread The thread to be stopped
+ * @param millis The amount of time in [ms] to stop the thread.
+ */
+ public static void threadWait(Thread thread, long millis) {
+ try {
+ thread.wait(millis);
+ } catch(InterruptedException ie) {
+ DEBUG("utils", "Utility", "threadWait()", "InterruptedException : " + ie.getMessage());
+ } catch (NullPointerException npe) {
+ DEBUG("utils", "Utility", "threadWait()", "The given Thread is NULL !");
+ }
+ }
+
+ /**
+ * To wait some times ...
+ */
+ public static void waitSomeTime(int ms) {
+ try {
+ Thread.sleep(ms);
+ } catch (InterruptedException e) {
+ DEBUG("utils", "Utility", "waitSomeTime()", "InterruptedException : " + e.getMessage());
+ }
+ }
+
+ /**
+ * Returns the md5 of any input...
+ * @param msg The input string to process
+ * @return The md5 of the input string.
+ */
+ public static String md5sum(String msg)
+ {
+ try {
+ MessageDigest md = MessageDigest.getInstance("md5");
+ return String.format("%032x", new BigInteger(1, md.digest(msg.getBytes(StandardCharsets.UTF_8))));
+ } catch (NoSuchAlgorithmException e) {
+ DEBUG("utils", "Utility", "md5sum()", "NoSuchAlgorithmException : " + e.getMessage());
+ }
+ return null;
+ }
+
+ /**
+ * Retrieves a random value rounded to 2 decimal...
+ *
+ * @param factor A coefficient which the random value is multiplied with.
+ * @return A random value rounded to 2 decimal converted to a String.
+ */
+ public static String getStringRndVal(int factor) {
+ float val = (float) rnd.nextDouble()*factor*10;
+ return String.format("%.2f", val).replace(",", ".");
+ }
+
+
+ /**
+ * Reads the incoming data from an input stream as long as there is
+ * something to read and saved the data in an array of bytes.
+ *
+ * The method is blocking !
+ * This method blocks until input data is available, end of file is detected,
+ * or an exception is thrown.
+ *
+ * If the length of of read data is zero, then no bytes are read and an empty
+ * array of bytes is returned; otherwise, there is an attempt to read at least
+ * one byte. If no byte is available because the stream is at the end of the
+ * file, the value -1 is returned; otherwise, at least one byte is read and
+ * returned as an array of bytes.
+ *
+ * @param in The input Stream where to read the data coming from.
+ * @return The read data as an array of bytes. Or null if the
+ * has been closed by the peer while waiting for incoming data.
+ * @throws IOException If the first byte cannot be read for any reason other
+ * than the end of the file, if the input stream has been
+ * closed, or if some other I/O error occurs.
+ */
+ public static byte[] readBytes(InputStream in) throws IOException
+ {
+ byte[] buffer = new byte[TCP_BUFFER_SIZE];
+
+ // Read the incoming data
+ int b = in.read(buffer);
+
+ // Creates an array of bytes with the right size
+ if (b == -1) return null; // the connection has been canceled by the peer
+ else if (b == 0) return new byte[0]; // empty data
+ else { // The received data
+ byte[] rBytes = new byte[b];
+ System.arraycopy(buffer, 0, rBytes, 0, b);
+ return rBytes;
+ }
+ }
+
+ /**
+ * Reads from the given input stream an amount of bytes and retrieves these data as
+ * an array of bytes. This method is
+ *
+ * The method is blocking !
+ *
+ * @param in The input Stream where to read the data coming from.
+ * @param len The number of bytes to be read from the input stream.
+ *
+ * @return The read data as an array of bytes.
+ *
+ * @throws IOException If the first byte cannot be read for any reason other
+ * than the end of the file, if the input stream has been
+ * closed, or if some other I/O error occurs.
+ */
+ public static byte[] readNBytes(InputStream in, int len) throws IOException
+ {
+ byte[] buffer = new byte[len];
+
+ // Checks that there is enough available data to read from the input stream
+ int counter = 0;
+ while (in.available() < len) {
+ Utility.waitSomeTime(2);
+ if (++counter > 10)
+ return null;
+ }
+
+ // Read the incoming data
+ int b = in.read(buffer, 0, len);
+
+ // Creates an array of bytes with the right size
+ if (b == -1) return null; // the connection has been canceled by the peer
+ else if (b == 0) return new byte[0]; // empty data
+ else return buffer; // The received data
+ }
+
+ /**
+ * Reads lines of text from the given input stream. A line is considered to be terminated by any one of a
+ * line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a line feed.
+ *
+ * @param in The Input Stream to read from.
+ * @return A list of String, without any line-termination characters, corresponding to each line read from the
+ * input stream, or an empty list if the end of the stream has been reached.
+ * @throws IOException If an I/O error occurs
+ */
+ public static List