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@HasQuery

<p>
	Identical to {@link oaj.http.annotation.HasFormData @HasFormData}, but only checks the existing of the parameter in the URL string, not
	URL-encoded form posts.
</p>
<ul class='javatree'>
	<li class='ja'>{@link oaj.http.annotation.HasQuery}
</ul>
<p>
	Unlike {@link oaj.http.annotation.HasFormData @HasFormData}, using this annotation does not result in the servlet reading the contents
	of URL-encoded form posts.
	Therefore, this annotation can be used in conjunction with the {@link oaj.http.annotation.Body @Body} annotation or
	{@link oajr.RestRequest#getBody()} method for <c>application/x-www-form-urlencoded POST</c> calls.
 </p>
<h5 class='figure'>Example:</h5>
<p class='bpcode w800'>
	<ja>@RestMethod</ja>(name=<jsf>GET</jsf>)
	<jk>public void</jk> doGet(<ja>@HasQuery</ja>(<js>"p1"</js>) <jk>boolean</jk> p1) {...}
</p>
<p>
	This is functionally equivalent to the following code:
</p>
<p class='bpcode w800'>
	<ja>@RestMethod</ja>(name=<jsf>GET</jsf>)
	<jk>public void</jk> doGet(RestRequest req) {
		<jk>boolean</jk> p1 = req.hasQuery(<js>"p1"</js>);
		...
	}
</p>
<p>
	The parameter type must be either <jk>boolean</jk> or {@link java.lang.Boolean}.
</p>
<p>
	The following table shows the behavioral differences between <ja>@HasQuery</ja> and <ja>@Query</ja>:
</p>
<table class='styled w400'>
	<tr>
		<th><c>Query content</c></th>
		<th><c><ja>@HasQuery</ja>(<js>"a"</js>)</c></th>
		<th><c><ja>@Query</ja>(<js>"a"</js>)</c></th>
	</tr>
	<tr>
		<td><c>?a=foo</c></td>
		<td><jk>true</jk></td>
		<td><js>"foo"</js></td>
	</tr>
	<tr>
		<td><c>?a=</c></td>
		<td><jk>true</jk></td>
		<td><js>""</js></td>
	</tr>
	<tr>
		<td><c>?a</c></td>
		<td><jk>true</jk></td>
		<td><jk>null</jk></td>
	</tr>
	<tr>
		<td><c>?b=foo</c></td>
		<td><jk>false</jk></td>
		<td><jk>null</jk></td>
	</tr>
</table>