public static RequestParameter exists(final String name)
   {
      return new RequestParameter(name, "{" + RequestParameter.class.getName() + "_" + name + "_value}") {
         @Override
         public String toString()
         {
            return "RequestParameter.exists(\"" + name + "\")";
         }
      };
   }
public static RequestParameter exists(final String name)
   {
      return new RequestParameter(name, "{" + RequestParameter.class.getName() + "_" + name + "_value}") {
         @Override
         public String toString()
         {
            return "RequestParameter.exists(\"" + name + "\")";
         }
      };
   }
public static RequestParameter exists ( final String name ) { return new RequestParameter ( name , "{" + RequestParameter . class . getName ( ) + "_" + name + "_value}" ) { @ Override public String toString ( ) { return "RequestParameter.exists(\"" + name + "\")" ; } } ; }
Create a {@link Condition} that matches against the existence of a request parameter with a name matching the
given pattern. The parameter value is ignored.
<p>
Parameter name expressions may be parameterized:
<p>
<code>
RequestParameter.exists("username")<br/>
RequestParameter.exists("{name}")<br/>
...
</code>

@param name {@link ParameterizedPattern} matching the request parameter name.

@see ConfigurationRuleParameterBuilder#where(String) {@link HttpServletRequest#getParameterMap()}
Create a { @link Condition } that matches against the existence of a request parameter with a name matching the given pattern . The parameter value is ignored . <p > Parameter name expressions may be parameterized : <p > <code > RequestParameter . exists ( username ) <br / > RequestParameter . exists ( { name } ) <br / > ... < / code >