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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.jena.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.jena.*;

/**
 * Annotation for specifying options for RDF serializers.
 *
 * <p>
 * Can be used in the following locations:
 * <ul>
 * 	<li>Marshalled classes/methods/fields/packages.
 * 	<li><ja>@Rest</ja>-annotated classes and <ja>@RestOp</ja>-annotated methods when an {@link #on()} value is specified.
 * </ul>
 *
 * <p>
 * Can be used for the following:
 * <ul>
 * 	<li>Override the default behavior of how collections and arrays are serialized.
 * </ul>
 *
 * <h5 class='section'>See Also:</h5><ul>
 * 	<li class='link'>{doc jmr.RdfDetails}

 * </ul>
 */
@Documented
@Target({PACKAGE,TYPE,FIELD,METHOD})
@Retention(RUNTIME)
@Inherited
@Repeatable(RdfAnnotation.Array.class)
@ContextApply({RdfAnnotation.SerializerApplier.class,RdfAnnotation.ParserApplier.class})
public @interface Rdf {

	/**
	 * Marks a bean property as a resource URI identifier for the bean.
	 *
	 * <p>
	 * Has the following effects on the following serializers:
	 * <ul class='spaced-list'>
	 * 	<li>
	 * 		{@link RdfSerializer} - Will be rendered as the value of the <js>"rdf:about"</js> attribute
	 * 		for the bean.
	 * </ul>
	 *
	 * @return The annotation value.
	 */
	boolean beanUri() default false;

	/**
	 * The format for how collections (lists and arrays for example) are serialized in RDF.
	 *
	 * @see RdfCollectionFormat
	 * @return The annotation value.
	 */
	RdfCollectionFormat collectionFormat() default RdfCollectionFormat.DEFAULT;

	/**
	 * Sets the namespace URI of this property or class.
	 *
	 * <p>
	 * Must be matched with a {@link #prefix() @Rdf(prefix)} annotation on this object, a parent object, or a {@link RdfNs @RdfNs} with the
	 * same name through the {@link RdfSchema#rdfNs() @RdfSchema(rdfNs)} annotation on the package.
	 *
	 * @return The annotation value.
	 */
	String namespace() default "";

	/**
	 * Dynamically apply this annotation to the specified classes/methods/fields.
	 *
	 * <p>
	 * Used in conjunction with {@link org.apache.juneau.BeanContext.Builder#applyAnnotations(Class...)} to dynamically apply an annotation to an existing class/method/field.
	 * It is ignored when the annotation is applied directly to classes/methods/fields.
	 *
	 * <h5 class='section'>Valid patterns:</h5>
	 * <ul class='spaced-list'>
	 *  <li>Classes:
	 * 		<ul>
	 * 			<li>Fully qualified:
	 * 				<ul>
	 * 					<li><js>"com.foo.MyClass"</js>
	 * 				</ul>
	 * 			<li>Fully qualified inner class:
	 * 				<ul>
	 * 					<li><js>"com.foo.MyClass$Inner1$Inner2"</js>
	 * 				</ul>
	 * 			<li>Simple:
	 * 				<ul>
	 * 					<li><js>"MyClass"</js>
	 * 				</ul>
	 * 			<li>Simple inner:
	 * 				<ul>
	 * 					<li><js>"MyClass$Inner1$Inner2"</js>
	 * 					<li><js>"Inner1$Inner2"</js>
	 * 					<li><js>"Inner2"</js>
	 * 				</ul>
	 * 		</ul>
	 * 	<li>Methods:
	 * 		<ul>
	 * 			<li>Fully qualified with args:
	 * 				<ul>
	 * 					<li><js>"com.foo.MyClass.myMethod(String,int)"</js>
	 * 					<li><js>"com.foo.MyClass.myMethod(java.lang.String,int)"</js>
	 * 					<li><js>"com.foo.MyClass.myMethod()"</js>
	 * 				</ul>
	 * 			<li>Fully qualified:
	 * 				<ul>
	 * 					<li><js>"com.foo.MyClass.myMethod"</js>
	 * 				</ul>
	 * 			<li>Simple with args:
	 * 				<ul>
	 * 					<li><js>"MyClass.myMethod(String,int)"</js>
	 * 					<li><js>"MyClass.myMethod(java.lang.String,int)"</js>
	 * 					<li><js>"MyClass.myMethod()"</js>
	 * 				</ul>
	 * 			<li>Simple:
	 * 				<ul>
	 * 					<li><js>"MyClass.myMethod"</js>
	 * 				</ul>
	 * 			<li>Simple inner class:
	 * 				<ul>
	 * 					<li><js>"MyClass$Inner1$Inner2.myMethod"</js>
	 * 					<li><js>"Inner1$Inner2.myMethod"</js>
	 * 					<li><js>"Inner2.myMethod"</js>
	 * 				</ul>
	 * 		</ul>
	 * 	<li>Fields:
	 * 		<ul>
	 * 			<li>Fully qualified:
	 * 				<ul>
	 * 					<li><js>"com.foo.MyClass.myField"</js>
	 * 				</ul>
	 * 			<li>Simple:
	 * 				<ul>
	 * 					<li><js>"MyClass.myField"</js>
	 * 				</ul>
	 * 			<li>Simple inner class:
	 * 				<ul>
	 * 					<li><js>"MyClass$Inner1$Inner2.myField"</js>
	 * 					<li><js>"Inner1$Inner2.myField"</js>
	 * 					<li><js>"Inner2.myField"</js>
	 * 				</ul>
	 * 		</ul>
	 * 	<li>A comma-delimited list of anything on this list.
	 * </ul>
	 *
	 * <h5 class='section'>See Also:</h5><ul>
	 * 	<li class='link'>{doc jm.DynamicallyAppliedAnnotations}
	 * </ul>
	 *
	 * @return The annotation value.
	 */
	String[] on() default {};

	/**
	 * Dynamically apply this annotation to the specified classes.
	 *
	 * <p>
	 * Identical to {@link #on()} except allows you to specify class objects instead of a strings.
	 *
	 * <h5 class='section'>See Also:</h5><ul>
	 * 	<li class='link'>{doc jm.DynamicallyAppliedAnnotations}
	 * </ul>
	 *
	 * @return The annotation value.
	 */
	Class<?>[] onClass() default {};

	/**
	 * Sets the XML prefix of this property or class.
	 *
	 * <p>
	 * Must either be matched to a {@link #namespace() @Rdf(namespace)} annotation on the same object, parent object, or a {@link RdfNs @RdfNs}
	 * with the same name through the {@link RdfSchema#rdfNs() @RdfSchema(rdfNs)} annotation on the package.
	 *
	 * @return The annotation value.
	 */
	String prefix() default "";
}
