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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.*;

import org.apache.juneau.annotation.*;
import org.apache.juneau.httppart.*;
import org.apache.juneau.oapi.*;

/**
 * REST request form-data annotation.
 *
 * 
 * 	Identifies a POJO to be used as a form-data entry on an HTTP request.
 *
 * 

 * Can be used in the following locations:
 * 

 * 	Arguments and argument-types of server-side @RestOp-annotated methods.
 * 	
Arguments and argument-types of client-side @RemoteResource-annotated interfaces.
 * 	
Methods and return types of server-side and client-side @Request-annotated interfaces.
 * 
 *
 * Arguments and argument-types of server-side @RestOp-annotated methods
 * 
 * Annotation that can be applied to a parameter of a @RestOp-annotated method to identify it as a URL query parameter.
 *
 * 

 * Unlike {@link FormData @FormData}, 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 @Content} annotation or
 * RestRequest.getContent() method for application/x-www-form-urlencoded POST calls.
 *
 * 
Example:
 * 
 * 	@RestGet
 * 	public void doGet(
 * 			@Query("p1") int p1,
 * 			@Query("p2") String p2,
 * 			@Query("p3") UUID p3
 * 		) {...}
 * 
 *
 * 
 * This is functionally equivalent to the following code...
 * 

 * 	@RestGet
 * 	public void doGet(RestRequest req, RestResponse res) {
 * 		int p1 = req.getQueryParam("p1").asInteger().orElse(0);
 * 		String p2 = req.getQueryParam("p2").asString().orElse(null);
 * 		UUID p3 = req.getQueryParam("p3").as(UUID.class).orElse(null);
 * 		...
 * 	}
 * 
 *
 * See Also:

 * 	Swagger
 * 	
Swagger Parameter Object
 * 
 *
 * Arguments and argument-types of client-side @RemoteResource-annotated interfaces
 * 
 * 
See Also:

 * 	@Query
 * 
 *
 * Methods and return types of server-side and client-side @Request-annotated interfaces
 * 
 * 
See Also:

 * 	@Request
 * 
 * 
 */
@Documented
@Target({PARAMETER,METHOD,TYPE,FIELD})
@Retention(RUNTIME)
@Inherited
@Repeatable(QueryAnnotation.Array.class)
@ContextApply(QueryAnnotation.Applier.class)
public @interface Query {

	/**
	 * Default value for this parameter.
	 *
	 * @return The annotation value.
	 */
	String def() default "";

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

	 * The value should be either a valid query parameter name, or "*" to represent multiple name/value pairs
	 *
	 * 

	 * A blank value (the default) has the following behavior:
	 * 

	 * 	
	 * 		If the data type is NameValuePairs, Map, or a bean,
	 * 		then it's the equivalent to "*" which will cause the value to be serialized as name/value pairs.
	 *
	 * 		Examples:
	 * 		
	 * 	// When used on a REST method
	 * 	@RestPost
	 * 	public void addPet(@Query JsonMap allQueryParameters) {...}
	 * 		
	 * 		
	 * 	// When used on a remote method parameter
	 * 	@RemoteResource(path="/myproxy")
	 * 	public interface MyProxy {
	 *
	 * 		// Equivalent to @Query("*")
	 * 		@RemoteGet("/mymethod")
	 * 		String myProxyMethod1(@Query Map<String,Object> allQueryParameters);
	 * 	}
	 * 		
	 * 		
	 * 	// When used on a request bean method
	 * 	public interface MyRequest {
	 *
	 * 		// Equivalent to @Query("*")
	 * 		@Query
	 * 		Map<String,Object> getFoo();
	 * 	}
	 * 		
	 * 	
	 * 	
	 * 		If used on a request bean method, uses the bean property name.
	 *
	 * 		Example:
	 * 		
	 * 	public interface MyRequest {
	 *
	 * 		// Equivalent to @Query("foo")
	 * 		@Query
	 * 		String getFoo();
	 * 	}
	 * 		
	 * 	
	 * 
	 * Notes:

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

	/**
	 * Dynamically apply this annotation to the specified classes.
	 *
	 * See Also:

	 * 	Dynamically Applied Annotations
	 * 
	 *
	 * @return The annotation value.
	 */
	String[] on() default {};

	/**
	 * Dynamically apply this annotation to the specified classes.
	 *
	 * 
	 * Identical to {@link #on()} except allows you to specify class objects instead of a strings.
	 *
	 * 
See Also:

	 * 	Dynamically Applied Annotations
	 * 
	 *
	 * @return The annotation value.
	 */
	Class[] onClass() default {};

	/**
	 * Specifies the {@link HttpPartParser} class used for parsing strings to values.
	 *
	 * 
	 * Overrides for this part the part parser defined on the REST resource which by default is {@link OpenApiParser}.
	 *
	 * @return The annotation value.
	 */
	Class parser() default HttpPartParser.Void.class;

	/**
	 * schema field of the Swagger Parameter Object.
	 *
	 * 

	 * The {@link Schema @Schema} annotation can also be used standalone on the parameter or type.
	 * Values specified on this field override values specified on the type, and values specified on child types override values
	 * specified on parent types.
	 *
	 * 

	 * The schema defining the type used for parameter.
	 *
	 * 
Used for:
	 * 
	 * 	
	 * 		Server-side schema-based parsing and parsing validation.
	 * 	

	 * 		Server-side generated Swagger documentation.
	 * 	

	 * 		Client-side schema-based serializing and serializing validation.
	 * 
	 *
	 * @return The annotation value.
	 */
	Schema schema() default @Schema;

	/**
	 * Specifies the {@link HttpPartSerializer} class used for serializing values to strings.
	 *
	 * 
	 * Overrides for this part the part serializer defined on the REST client which by default is {@link OpenApiSerializer}.
	 *
	 * @return The annotation value.
	 */
	Class serializer() default HttpPartSerializer.Void.class;

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