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package org.apache.juneau.http.annotation;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

import java.lang.annotation.*;

/**
 * REST has-query-parameter annotation.
 *
 * 
 * Identifies whether or not an HTTP request has the specified query parameter.
 *
 * 

 * Can be used in the following locations:
 * 

 * 	Arguments and argument-types of server-side @RestOp-annotated methods.
 * 
 * 
 * 	Identical to {@link HasFormData @HasFormData}, but only checks the existing of the parameter in the URL string, not
 * 	URL-encoded form posts.
 * 
 * 
 * 	Unlike {@link 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 Content @Cpmtemt} annotation or
 * 	{@code RestRequest.getContent()} method for application/x-www-form-urlencoded POST calls.
 *  
 * Example:
 * 
 * 	@RestGet
 * 	public void doGet(@HasQuery("p1") boolean p1) {...}
 * 
 * 
 * 	This is functionally equivalent to the following code:
 * 
 * 
 * 	@RestGet
 * 	public void doGet(RestRequest req) {
 * 		boolean p1 = req.getQueryParam("p1").isPresent();
 * 		...
 * 	}
 * 
 * 
 * 	The parameter type must be either boolean or {@link java.lang.Boolean}.
 * 
 * 
 * 	The following table shows the behavioral differences between @HasQuery and @Query:
 * 
 * 
 * 	
 * 		
 * 		
 * 		
 * 	
 * 	
 * 		
 * 		
 * 		
 * 	
 * 	
 * 		
 * 		
 * 		
 * 	
 * 	
 * 		
 * 		
 * 		
 * 	
 * 	
 * 		
 * 		
 * 		
 * 	
 * Query content @HasQuery("a") @Query("a")
?a=foo true "foo"
?a= true ""
?a true null
?b=foo false null
 * 
 * 
See Also:


 * 
 */
@Documented
@Target({PARAMETER})
@Retention(RUNTIME)
@Inherited
public @interface HasQuery {

	/**
	 * URL query parameter name.
	 *
	 * Required. The name of the parameter. Parameter names are case sensitive.
	 *
	 * Notes:

	 * 	
	 * 		The format is plain-text.
	 * 
	 *
	 * @return The annotation value.
	 */
	String name() default "";

	/**
	 * A synonym for {@link #name()}.
	 *
	 * 
	 * Allows you to use shortened notation if you're only specifying the name.
	 *
	 * 

	 * The following are completely equivalent ways of defining the existence of a query entry:
	 * 

	 * 	public Order placeOrder(@HasQuery(name="petId") boolean hasPetId) {...}
	 * 
	 * 
	 * 	public Order placeOrder(@HasQuery("petId") boolean hasPetId) {...}
	 * 
	 *
	 * @return The annotation value.
	 */
	String value() default "";
}