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<div class="subTitle">ch.hevs.isi.utils</div>
<h2 title="Class Utility" class="title">Class Utility</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="typeNameLabel">Utility</span>
extends java.lang.Object</pre>
<div class="block">This class contains some useful Java methods to manipulate data.</div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static java.util.Random</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#rnd">rnd</a></span></code>
<div class="block">Object to get some random values...</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#TCP_BUFFER_SIZE">TCP_BUFFER_SIZE</a></span></code>
<div class="block">Default size for the TCP input stream</div>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#Utility--">Utility</a></span>()</code> </td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>static java.lang.Float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#bytesToFloat-byte:A-int-int-">bytesToFloat</a></span>(byte[] bytes,
int offset,
int size)</code>
<div class="block">Returns a <code>float</code> value from array of bytes.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#calculateCRC-byte:A-int-int-">calculateCRC</a></span>(byte[] data,
int offset,
int len)</code>
<div class="block">Calculates and returns the CRC using the data passed in parameters.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#checkCRC-byte:A-int-int-byte:A-">checkCRC</a></span>(byte[] data,
int offset,
int len,
byte[] crc)</code>
<div class="block">Checks the CRC and returns true if it is correct, otherwise false.</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#DEBUG-java.lang.String-java.lang.String-java.lang.String-">DEBUG</a></span>(java.lang.String className,
java.lang.String method,
java.lang.String msg)</code> </td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static java.io.BufferedReader</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#fileParser-java.lang.String-java.lang.String-">fileParser</a></span>(java.lang.String path,
java.lang.String fileName)</code>
<div class="block">Method to use to access a file in your resources folder...</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#getHexString-byte:A-">getHexString</a></span>(byte[] b)</code>
<div class="block">Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f).</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#getHexString-byte:A-int-int-">getHexString</a></span>(byte[] b,
int offset,
int length)</code>
<div class="block">Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f)</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#getStringRndVal-int-">getStringRndVal</a></span>(int factor)</code>
<div class="block">Retrieves a random value rounded to 2 decimal...</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#md5sum-java.lang.String-">md5sum</a></span>(java.lang.String msg)</code>
<div class="block">Returns the md5 of any input...</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#readBytes-java.io.InputStream-">readBytes</a></span>(java.io.InputStream in)</code>
<div class="block">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.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#readLine-java.io.InputStream-">readLine</a></span>(java.io.InputStream in)</code>
<div class="block">Reads a line of text.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#readNBytes-java.io.InputStream-int-">readNBytes</a></span>(java.io.InputStream in,
int len)</code>
<div class="block">Reads from the given input stream an amount of bytes and retrieves these data as an array of bytes.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#sendBytes-java.io.OutputStream-byte:A-int-int-">sendBytes</a></span>(java.io.OutputStream out,
byte[] toSend,
int offset,
int length)</code>
<div class="block">This method sends the content of the <code>buffer</code> to the given <code>OutputStream</code>.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#unsignedByteToSignedInt-byte-">unsignedByteToSignedInt</a></span>(byte from)</code>
<div class="block">Converts an unsigned byte to a signed integer.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#waitSomeTime-int-">waitSomeTime</a></span>(int ms)</code>
<div class="block">To wait some times ...</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../ch/hevs/isi/utils/Utility.html#writeLine-java.io.OutputStream-byte:A-">writeLine</a></span>(java.io.OutputStream out,
byte[] toSend)</code>
<div class="block">Send the data contained in the given array of bytes through the output
stream.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>TCP_BUFFER_SIZE</h4>
<pre>public static final int TCP_BUFFER_SIZE</pre>
<div class="block">Default size for the TCP input stream</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#ch.hevs.isi.utils.Utility.TCP_BUFFER_SIZE">Constant Field Values</a></dd>
</dl>
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<h4>rnd</h4>
<pre>public static java.util.Random rnd</pre>
<div class="block">Object to get some random values...</div>
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<h4>Utility</h4>
<pre>public Utility()</pre>
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<h4>calculateCRC</h4>
<pre>public static byte[] calculateCRC(byte[] data,
int offset,
int len)</pre>
<div class="block">Calculates and returns the CRC using the data passed in parameters.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - a byte array containing the data to send</dd>
<dd><code>offset</code> - the offset</dd>
<dd><code>len</code> - the data length</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>byte[] the CRC</dd>
</dl>
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<h4>checkCRC</h4>
<pre>public static boolean checkCRC(byte[] data,
int offset,
int len,
byte[] crc)</pre>
<div class="block">Checks the CRC and returns true if it is correct, otherwise false.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - a byte array containing the data to send</dd>
<dd><code>offset</code> - the offset</dd>
<dd><code>len</code> - the data length</dd>
<dd><code>crc</code> - a byte array containing the CRC to check</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>boolean true if the CRC is correct, otherwise false</dd>
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<pre>public static int unsignedByteToSignedInt(byte from)</pre>
<div class="block">Converts an unsigned byte to a signed integer.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>from</code> - an unsigned byte to convert to a signed integer</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>int a signed integer</dd>
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<h4>getHexString</h4>
<pre>public static java.lang.String getHexString(byte[] b)</pre>
<div class="block">Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f). The array of bytes is
converted from offset 0 to its end.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>b</code> - Array of bytes to be converted in HEX string.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A String representing the HEX values of the given array of bytes.</dd>
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<pre>public static java.lang.String getHexString(byte[] b,
int offset,
int length)</pre>
<div class="block">Utility method to convert a byte array in a string made up of hex (0,.. 9, a,..f)</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>b</code> - The byte array to convert in HEX string</dd>
<dd><code>offset</code> - The index where we start to convert from.</dd>
<dd><code>length</code> - The amount of bytes to convert in HEX string</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A String representing the HEX values of the selected bytes of the array.</dd>
</dl>
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<h4>getStringRndVal</h4>
<pre>public static java.lang.String getStringRndVal(int factor)</pre>
<div class="block">Retrieves a random value rounded to 2 decimal...</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>factor</code> - A coefficient which the random value is multiplied with.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A random value rounded to 2 decimal converted to a String.</dd>
</dl>
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<pre>public static byte[] readBytes(java.io.InputStream in)
throws java.io.IOException</pre>
<div class="block">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.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - The input Stream where to read the data coming from.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The read data as an <code>array of bytes</code>. Or null if the has been closed by the peer while
waiting for incoming data.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - 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.</dd>
</dl>
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<pre>public static byte[] readNBytes(java.io.InputStream in,
int len)
throws java.io.IOException</pre>
<div class="block">Reads from the given input stream an amount of bytes and retrieves these data as an array of bytes.
The method is blocking !</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - The input stream where to read the data coming from.</dd>
<dd><code>len</code> - The amount of data to read</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The read data as an <code>array of bytes</code>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - 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.</dd>
</dl>
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<h4>readLine</h4>
<pre>public static byte[] readLine(java.io.InputStream in)
throws java.io.IOException</pre>
<div class="block">Reads a line of text. 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.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - The Input Stream to read from.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An array of bytes containing the contents of the line, not including any
line-termination characters, or null if the end of the stream has
been reached.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - If an I/O error occurs</dd>
</dl>
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<pre>public static void writeLine(java.io.OutputStream out,
byte[] toSend)
throws java.io.IOException</pre>
<div class="block">Send the data contained in the given array of bytes through the output
stream. If the data to send do not end with a carriage return, the method adds '\r\n' at the end.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - The Output Stream to send the data to.</dd>
<dd><code>toSend</code> - The data to send</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - If an I/O error occurs</dd>
</dl>
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<h4>sendBytes</h4>
<pre>public static void sendBytes(java.io.OutputStream out,
byte[] toSend,
int offset,
int length)
throws java.io.IOException</pre>
<div class="block">This method sends the content of the <code>buffer</code> to the given <code>OutputStream</code>. This content is
specified by the starting position, defined by <code>offset</code>, and the amount of bytes,defined by
<code>length</code>. If an error occurs during this process, a exception will be raised.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - The Output Stream to send the data to.</dd>
<dd><code>toSend</code> - The data to send</dd>
<dd><code>offset</code> - The starting position in the buffer of data</dd>
<dd><code>length</code> - The amount of bytes to be sent.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - If an I/O error occurs</dd>
</dl>
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<h4>waitSomeTime</h4>
<pre>public static void waitSomeTime(int ms)</pre>
<div class="block">To wait some times ... Simply give the delay you want to wait for and that's it !</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>ms</code> - The amount of time to wait expressed in milli-seconds [ms].</dd>
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<pre>public static java.lang.String md5sum(java.lang.String msg)</pre>
<div class="block">Returns the md5 of any input...</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>msg</code> - The input string to process</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The md5 of the input string.</dd>
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<pre>public static java.lang.Float bytesToFloat(byte[] bytes,
int offset,
int size)</pre>
<div class="block">Returns a <code>float</code> value from array of bytes. This byte's array can only be 2 or 4 bytes long.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>bytes</code> - The array of bytes to convert.</dd>
<dd><code>offset</code> - The position where the method has to start to get the bytes from.</dd>
<dd><code>size</code> - The amount of bytes to convert.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <code>Float</code> value or <code>null</code> if the process failed.</dd>
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<pre>public static java.io.BufferedReader fileParser(java.lang.String path,
java.lang.String fileName)</pre>
<div class="block">Method to use to access a file in your resources folder... The file you want to access has to be under the
`resources` folder of your project. You can create as many sub-folders as you want, they will become the path of
the file to work with. This path is given to the method by the parameter `path` and the file is identified by its
name and extension.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>path</code> - folder's hierarchy (if exists) from `resources`</dd>
<dd><code>fileName</code> - Name of the file to access</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <code>BufferedReader</code> related to the file you want to work with, or null if the file could not
be reached.</dd>
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<h4>DEBUG</h4>
<pre>public static void DEBUG(java.lang.String className,
java.lang.String method,
java.lang.String msg)</pre>
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