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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">jakarta.ws.rs.ext</a></div>
<h2 title="Interface ParamConverter" class="title">Interface ParamConverter&lt;T&gt;</h2>
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<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the supported Java type convertible to/from a <code>String</code> format.</dd>
</dl>
<hr>
<pre>public interface <span class="typeNameLabel">ParamConverter&lt;T&gt;</span></pre>
<div class="block">Defines a contract for a delegate responsible for converting between a <code>String</code> form of a message parameter
value and the corresponding custom Java type <code>T</code>.
Conversion of message parameter values injected via <a href="../PathParam.html" title="annotation in jakarta.ws.rs"><code>&#64;PathParam</code></a>,
<a href="../QueryParam.html" title="annotation in jakarta.ws.rs"><code>&#64;QueryParam</code></a>, <a href="../MatrixParam.html" title="annotation in jakarta.ws.rs"><code>&#64;MatrixParam</code></a>,
<a href="../FormParam.html" title="annotation in jakarta.ws.rs"><code>&#64;FormParam</code></a>, <a href="../CookieParam.html" title="annotation in jakarta.ws.rs"><code>&#64;CookieParam</code></a> and
<a href="../HeaderParam.html" title="annotation in jakarta.ws.rs"><code>&#64;HeaderParam</code></a> is supported.
JAX-RS implementations MUST support the <code>ParamConverter</code> mechanism for all Java types. If a
<code>ParamConverter</code> is available for a type, it MUST be preferred over all other conversion strategies mentioned
in section 3.2 (i.e. single <code>String</code> argument constructor, static <code>valueOf</code> or <code>fromString</code>
methods, etc.).
<p>
By default, when used for injection of parameter values, a selected <code>ParamConverter</code> instance MUST be used
eagerly by a JAX-RS runtime to convert any <a href="../DefaultValue.html" title="annotation in jakarta.ws.rs"><code>default value</code></a> in the resource or provider model, that
is during the application deployment, before any value &ndash; default or otherwise &ndash; is actually required.
This conversion strategy ensures that any errors in the default values are reported as early as possible. This
default behavior may be overridden by annotating the <code>ParamConverter</code> implementation class with a <a href="ParamConverter.Lazy.html" title="annotation in jakarta.ws.rs.ext"><code>&#64;Lazy</code></a> annotation. In such case any default value conversion delegated to the <code>@Lazy</code>-annotated converter
will be deferred to a latest possible moment (i.e. until the injection of such default value is required).
</p>
<p>
NOTE: A service implementing this contract is not recognized as a registrable JAX-RS extension provider. Instead, a
<a href="ParamConverterProvider.html" title="interface in jakarta.ws.rs.ext"><code>ParamConverterProvider</code></a> instance responsible for providing <code>ParamConverter</code> instances has to be
registered as one of the JAX-RS extension providers.
</p></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Marek Potociar</dd>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ParamConverter.Lazy.html" title="annotation in jakarta.ws.rs.ext">ParamConverter.Lazy</a></span></code></th>
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<div class="block">Mandates that a conversion of any <a href="../DefaultValue.html" title="annotation in jakarta.ws.rs"><code>default value</code></a> delegated to a <a href="ParamConverter.html" title="interface in jakarta.ws.rs.ext"><code>parameter
converter</code></a> annotated with <code>@Lazy</code> annotation SHOULD occur only once the value is actually required (e.g.</div>
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<td class="colFirst"><code><a href="ParamConverter.html" title="type parameter in ParamConverter">T</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fromString(java.lang.String)">fromString</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;value)</code></th>
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<div class="block">Parse the supplied value and create an instance of <code>T</code>.</div>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString(T)">toString</a></span>&#8203;(<a href="ParamConverter.html" title="type parameter in ParamConverter">T</a>&nbsp;value)</code></th>
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<div class="block">Convert the supplied value to a String.</div>
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<h4>fromString</h4>
<pre class="methodSignature"><a href="ParamConverter.html" title="type parameter in ParamConverter">T</a>&nbsp;fromString&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;value)</pre>
<div class="block">Parse the supplied value and create an instance of <code>T</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - the string value.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the newly created instance of <code>T</code>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the supplied string cannot be parsed or is <code>null</code>.</dd>
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<h4>toString</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;toString&#8203;(<a href="ParamConverter.html" title="type parameter in ParamConverter">T</a>&nbsp;value)</pre>
<div class="block">Convert the supplied value to a String.
<p>
This method is reserved for future use. Proprietary JAX-RS extensions may leverage the method. Users should be aware
that any such support for the method comes at the expense of producing non-portable code.
</p></div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - the value of type <code>T</code>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a String representation of the value.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the supplied object cannot be serialized or is <code>null</code>.</dd>
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