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RequestAttributes

<p>
	The {@link oajr.RequestAttributes} object is the API for accessing the standard servlet attributes on an HTTP request 
	(i.e. {@link javax.servlet.ServletRequest#getAttribute(String)}.
	It wraps the request attributes in a {@link java.util.Map} interface and provides several convenience methods.
</p>
<p>
	The <c>RequestAttributes</c> object extends from {@link oaj.ObjectMap} so all the convenience methods defined on
	that API are also available when working with request attributes: 
</p>
<p class='bpcode w800'>
	<ja>@RestMethod</ja>(...)
	<jk>public</jk> Object myMethod(RequestAttributes attributes) {...}			
</p>
<h5 class='figure'>Example:</h5>
<p class='bpcode w800'>
	<ja>@RestMethod</ja>(...)
	<jk>public</jk> Object myMethod(RequestAttributes attributes) {

		<jc>// Add a default value.</jc>
		attributes.putIfNotExists(<js>"Foo"</js>, 123);
	
		<jc>// Get an attribute value as a POJO.</jc>
		UUID etag = attributes.get(<js>"ETag"</js>, UUID.<jk>class</jk>);
	}			
</p>
<p>
	Modifications made to request attributes through the <c>RequestAttributes</c> bean are automatically reflected in
	the underlying servlet request attributes making it possible to mix the usage of both APIs.
</p>