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<!DOCTYPE HTML>
<!-- NewPage -->
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<!-- Generated by javadoc -->
<title>IDN (Java SE 12 & JDK 12 )</title>
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<meta name="keywords" content="ALLOW_UNASSIGNED">
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<meta name="keywords" content="toASCII()">
<meta name="keywords" content="toUnicode()">
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<div class="aboutLanguage"><div style="margin-top: 14px;"><strong>Java SE 12 & JDK 12</strong> </div></div>
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<div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">java.net</a></div>
<h2 title="Class IDN" class="title">Class IDN</h2>
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<pre>public final class <span class="typeNameLabel">IDN</span>
extends <a href="../lang/Object.html" title="class in java.lang">Object</a></pre>
<div class="block">Provides methods to convert internationalized domain names (IDNs) between
a normal Unicode representation and an ASCII Compatible Encoding (ACE) representation.
Internationalized domain names can use characters from the entire range of
Unicode, while traditional domain names are restricted to ASCII characters.
ACE is an encoding of Unicode strings that uses only ASCII characters and
can be used with software (such as the Domain Name System) that only
understands traditional domain names.
<p>Internationalized domain names are defined in <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
RFC 3490 defines two operations: ToASCII and ToUnicode. These 2 operations employ
<a href="http://www.ietf.org/rfc/rfc3491.txt">Nameprep</a> algorithm, which is a
profile of <a href="http://www.ietf.org/rfc/rfc3454.txt">Stringprep</a>, and
<a href="http://www.ietf.org/rfc/rfc3492.txt">Punycode</a> algorithm to convert
domain name string back and forth.
<p>The behavior of aforementioned conversion process can be adjusted by various flags:
<ul>
<li>If the ALLOW_UNASSIGNED flag is used, the domain name string to be converted
can contain code points that are unassigned in Unicode 3.2, which is the
Unicode version on which IDN conversion is based. If the flag is not used,
the presence of such unassigned code points is treated as an error.
<li>If the USE_STD3_ASCII_RULES flag is used, ASCII strings are checked against <a href="http://www.ietf.org/rfc/rfc1122.txt">RFC 1122</a> and <a href="http://www.ietf.org/rfc/rfc1123.txt">RFC 1123</a>.
It is an error if they don't meet the requirements.
</ul>
These flags can be logically OR'ed together.
<p>The security consideration is important with respect to internationalization
domain name support. For example, English domain names may be <i>homographed</i>
- maliciously misspelled by substitution of non-Latin letters.
<a href="http://www.unicode.org/reports/tr36/">Unicode Technical Report #36</a>
discusses security issues of IDN support as well as possible solutions.
Applications are responsible for taking adequate security measures when using
international domain names.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.6</dd>
</dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ALLOW_UNASSIGNED">ALLOW_UNASSIGNED</a></span></code></th>
<td class="colLast">
<div class="block">Flag to allow processing of unassigned code points</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#USE_STD3_ASCII_RULES">USE_STD3_ASCII_RULES</a></span></code></th>
<td class="colLast">
<div class="block">Flag to turn on the check against STD-3 ASCII rules</div>
</td>
</tr>
</tbody>
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<h3>Method Summary</h3>
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<td class="colFirst"><code>static <a href="../lang/String.html" title="class in java.lang">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toASCII(java.lang.String)">toASCII</a></span>​(<a href="../lang/String.html" title="class in java.lang">String</a> input)</code></th>
<td class="colLast">
<div class="block">Translates a string from Unicode to ASCII Compatible Encoding (ACE),
as defined by the ToASCII operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.</div>
</td>
</tr>
<tr class="rowColor" id="i1">
<td class="colFirst"><code>static <a href="../lang/String.html" title="class in java.lang">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toASCII(java.lang.String,int)">toASCII</a></span>​(<a href="../lang/String.html" title="class in java.lang">String</a> input,
int flag)</code></th>
<td class="colLast">
<div class="block">Translates a string from Unicode to ASCII Compatible Encoding (ACE),
as defined by the ToASCII operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.</div>
</td>
</tr>
<tr class="altColor" id="i2">
<td class="colFirst"><code>static <a href="../lang/String.html" title="class in java.lang">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toUnicode(java.lang.String)">toUnicode</a></span>​(<a href="../lang/String.html" title="class in java.lang">String</a> input)</code></th>
<td class="colLast">
<div class="block">Translates a string from ASCII Compatible Encoding (ACE) to Unicode,
as defined by the ToUnicode operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.</div>
</td>
</tr>
<tr class="rowColor" id="i3">
<td class="colFirst"><code>static <a href="../lang/String.html" title="class in java.lang">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toUnicode(java.lang.String,int)">toUnicode</a></span>​(<a href="../lang/String.html" title="class in java.lang">String</a> input,
int flag)</code></th>
<td class="colLast">
<div class="block">Translates a string from ASCII Compatible Encoding (ACE) to Unicode,
as defined by the ToUnicode operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.</div>
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<h3>Methods declared in class java.lang.<a href="../lang/Object.html" title="class in java.lang">Object</a></h3>
<code><a href="../lang/Object.html#clone()">clone</a>, <a href="../lang/Object.html#equals(java.lang.Object)">equals</a>, <a href="../lang/Object.html#finalize()">finalize</a>, <a href="../lang/Object.html#getClass()">getClass</a>, <a href="../lang/Object.html#hashCode()">hashCode</a>, <a href="../lang/Object.html#notify()">notify</a>, <a href="../lang/Object.html#notifyAll()">notifyAll</a>, <a href="../lang/Object.html#toString()">toString</a>, <a href="../lang/Object.html#wait()">wait</a>, <a href="../lang/Object.html#wait(long)">wait</a>, <a href="../lang/Object.html#wait(long,int)">wait</a></code></li>
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<h3>Field Detail</h3>
<a id="ALLOW_UNASSIGNED">
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<h4>ALLOW_UNASSIGNED</h4>
<pre>public static final int ALLOW_UNASSIGNED</pre>
<div class="block">Flag to allow processing of unassigned code points</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../constant-values.html#java.net.IDN.ALLOW_UNASSIGNED">Constant Field Values</a></dd>
</dl>
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<h4>USE_STD3_ASCII_RULES</h4>
<pre>public static final int USE_STD3_ASCII_RULES</pre>
<div class="block">Flag to turn on the check against STD-3 ASCII rules</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../constant-values.html#java.net.IDN.USE_STD3_ASCII_RULES">Constant Field Values</a></dd>
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<h4>toASCII</h4>
<pre class="methodSignature">public static <a href="../lang/String.html" title="class in java.lang">String</a> toASCII​(<a href="../lang/String.html" title="class in java.lang">String</a> input,
int flag)</pre>
<div class="block">Translates a string from Unicode to ASCII Compatible Encoding (ACE),
as defined by the ToASCII operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
<p>ToASCII operation can fail. ToASCII fails if any step of it fails.
If ToASCII operation fails, an IllegalArgumentException will be thrown.
In this case, the input string should not be used in an internationalized domain name.
<p> A label is an individual part of a domain name. The original ToASCII operation,
as defined in RFC 3490, only operates on a single label. This method can handle
both label and entire domain name, by assuming that labels in a domain name are
always separated by dots. The following characters are recognized as dots:
\u002E (full stop), \u3002 (ideographic full stop), \uFF0E (fullwidth full stop),
and \uFF61 (halfwidth ideographic full stop). if dots are
used as label separators, this method also changes all of them to \u002E (full stop)
in output translated string.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>input</code> - the string to be processed</dd>
<dd><code>flag</code> - process flag; can be 0 or any logical OR of possible flags</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the translated <code>String</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - if the input string doesn't conform to RFC 3490 specification</dd>
</dl>
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<h4>toASCII</h4>
<pre class="methodSignature">public static <a href="../lang/String.html" title="class in java.lang">String</a> toASCII​(<a href="../lang/String.html" title="class in java.lang">String</a> input)</pre>
<div class="block">Translates a string from Unicode to ASCII Compatible Encoding (ACE),
as defined by the ToASCII operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
<p> This convenience method works as if by invoking the
two-argument counterpart as follows:
<blockquote>
<a href="#toASCII(java.lang.String,int)"><code>toASCII</code></a>(input, 0);
</blockquote></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>input</code> - the string to be processed</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the translated <code>String</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - if the input string doesn't conform to RFC 3490 specification</dd>
</dl>
</li>
</ul>
<a id="toUnicode(java.lang.String,int)">
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<h4>toUnicode</h4>
<pre class="methodSignature">public static <a href="../lang/String.html" title="class in java.lang">String</a> toUnicode​(<a href="../lang/String.html" title="class in java.lang">String</a> input,
int flag)</pre>
<div class="block">Translates a string from ASCII Compatible Encoding (ACE) to Unicode,
as defined by the ToUnicode operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
<p>ToUnicode never fails. In case of any error, the input string is returned unmodified.
<p> A label is an individual part of a domain name. The original ToUnicode operation,
as defined in RFC 3490, only operates on a single label. This method can handle
both label and entire domain name, by assuming that labels in a domain name are
always separated by dots. The following characters are recognized as dots:
\u002E (full stop), \u3002 (ideographic full stop), \uFF0E (fullwidth full stop),
and \uFF61 (halfwidth ideographic full stop).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>input</code> - the string to be processed</dd>
<dd><code>flag</code> - process flag; can be 0 or any logical OR of possible flags</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the translated <code>String</code></dd>
</dl>
</li>
</ul>
<a id="toUnicode(java.lang.String)">
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</a>
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<h4>toUnicode</h4>
<pre class="methodSignature">public static <a href="../lang/String.html" title="class in java.lang">String</a> toUnicode​(<a href="../lang/String.html" title="class in java.lang">String</a> input)</pre>
<div class="block">Translates a string from ASCII Compatible Encoding (ACE) to Unicode,
as defined by the ToUnicode operation of <a href="http://www.ietf.org/rfc/rfc3490.txt">RFC 3490</a>.
<p> This convenience method works as if by invoking the
two-argument counterpart as follows:
<blockquote>
<a href="#toUnicode(java.lang.String,int)"><code>toUnicode</code></a>(input, 0);
</blockquote></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>input</code> - the string to be processed</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the translated <code>String</code></dd>
</dl>
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