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// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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// ***************************************************************************************************************************
package org.apache.juneau.http.annotation;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
import static org.apache.juneau.internal.ArrayUtils.*;
import static org.apache.juneau.internal.StringUtils.*;

import java.lang.annotation.*;
import java.lang.reflect.*;
import org.apache.juneau.*;
import org.apache.juneau.annotation.*;
import org.apache.juneau.httppart.*;
import org.apache.juneau.reflect.*;
import org.apache.juneau.svl.*;

/**
 * Utility classes and methods for the {@link Query @Query} annotation.
 *
 * <ul class='seealso'>
 * 	<li class='extlink'>{@source}
 * </ul>
 */
public class QueryAnnotation {

	//-----------------------------------------------------------------------------------------------------------------
	// Static
	//-----------------------------------------------------------------------------------------------------------------

	/** Default value */
	public static final Query DEFAULT = create().build();

	/**
	 * Instantiates a new builder for this class.
	 *
	 * @return A new builder object.
	 */
	public static Builder create() {
		return new Builder();
	}

	/**
	 * Instantiates a new builder for this class.
	 *
	 * @param on The targets this annotation applies to.
	 * @return A new builder object.
	 */
	public static Builder create(Class<?>...on) {
		return create().on(on);
	}

	/**
	 * Instantiates a new builder for this class.
	 *
	 * @param on The targets this annotation applies to.
	 * @return A new builder object.
	 */
	public static Builder create(String...on) {
		return create().on(on);
	}

	/**
	 * Returns <jk>true</jk> if the specified annotation contains all default values.
	 *
	 * @param a The annotation to check.
	 * @return <jk>true</jk> if the specified annotation contains all default values.
	 */
	public static boolean empty(Query a) {
		return a == null || DEFAULT.equals(a);
	}

	/**
	 * Finds the name from the specified lists of annotations.
	 *
	 * <p>
	 * The last matching name found is returned.
	 *
	 * @param pi The parameter.
	 * @return The last matching name, or {@link Value#empty()} if not found.
	 */
	public static Value<String> findName(ParamInfo pi) {
		Value<String> n = Value.empty();
		pi.forEachAnnotation(Query.class, x -> isNotEmpty(x.value()), x -> n.set(x.value()));
		pi.forEachAnnotation(Query.class, x -> isNotEmpty(x.name()), x -> n.set(x.name()));
		return n;
	}

	//-----------------------------------------------------------------------------------------------------------------
	// Builder
	//-----------------------------------------------------------------------------------------------------------------

	/**
	 * Builder class.
	 *
	 * <ul class='seealso'>
	 * 	<li class='jm'>{@link org.apache.juneau.BeanContext.Builder#annotations(Annotation...)}
	 * </ul>
	 */
	public static class Builder extends TargetedAnnotationTMFBuilder {

		Class<? extends HttpPartParser> parser = HttpPartParser.Void.class;
		Class<? extends HttpPartSerializer> serializer = HttpPartSerializer.Void.class;
		Schema schema = SchemaAnnotation.DEFAULT;
		String name="", value="";

		/**
		 * Constructor.
		 */
		protected Builder() {
			super(Query.class);
		}

		/**
		 * Instantiates a new {@link Query @Query} object initialized with this builder.
		 *
		 * @return A new {@link Query @Query} object.
		 */
		public Query build() {
			return new Impl(this);
		}

		/**
		 * Sets the {@link Query#name} property on this annotation.
		 *
		 * @param value The new value for this property.
		 * @return This object.
		 */
		public Builder name(String value) {
			this.name = value;
			return this;
		}

		/**
		 * Sets the {@link Query#parser} property on this annotation.
		 *
		 * @param value The new value for this property.
		 * @return This object.
		 */
		public Builder parser(Class<? extends HttpPartParser> value) {
			this.parser = value;
			return this;
		}

		/**
		 * Sets the {@link Query#schema} property on this annotation.
		 *
		 * @param value The new value for this property.
		 * @return This object.
		 */
		public Builder schema(Schema value) {
			this.schema = value;
			return this;
		}

		/**
		 * Sets the {@link Query#serializer} property on this annotation.
		 *
		 * @param value The new value for this property.
		 * @return This object.
		 */
		public Builder serializer(Class<? extends HttpPartSerializer> value) {
			this.serializer = value;
			return this;
		}

		/**
		 * Sets the {@link Query#value} property on this annotation.
		 *
		 * @param value The new value for this property.
		 * @return This object.
		 */
		public Builder value(String value) {
			this.value = value;
			return this;
		}

		// <FluentSetters>

		@Override /* GENERATED - TargetedAnnotationBuilder */
		public Builder on(String...values) {
			super.on(values);
			return this;
		}

		@Override /* GENERATED - TargetedAnnotationTBuilder */
		public Builder on(java.lang.Class<?>...value) {
			super.on(value);
			return this;
		}

		@Override /* GENERATED - TargetedAnnotationTBuilder */
		public Builder onClass(java.lang.Class<?>...value) {
			super.onClass(value);
			return this;
		}

		@Override /* GENERATED - TargetedAnnotationTMFBuilder */
		public Builder on(Field...value) {
			super.on(value);
			return this;
		}

		@Override /* GENERATED - TargetedAnnotationTMFBuilder */
		public Builder on(Method...value) {
			super.on(value);
			return this;
		}

		// </FluentSetters>
	}

	//-----------------------------------------------------------------------------------------------------------------
	// Implementation
	//-----------------------------------------------------------------------------------------------------------------

	private static class Impl extends TargetedAnnotationTImpl implements Query {

		private final Class<? extends HttpPartParser> parser;
		private final Class<? extends HttpPartSerializer> serializer;
		private final String name, value;
		private final Schema schema;

		Impl(Builder b) {
			super(b);
			this.name = b.name;
			this.parser = b.parser;
			this.schema = b.schema;
			this.serializer = b.serializer;
			this.value = b.value;
			postConstruct();
		}

		@Override /* Query */
		public String name() {
			return name;
		}

		@Override /* Query */
		public Class<? extends HttpPartParser> parser() {
			return parser;
		}

		@Override /* Query */
		public Schema schema() {
			return schema;
		}

		@Override /* Query */
		public Class<? extends HttpPartSerializer> serializer() {
			return serializer;
		}

		@Override /* Query */
		public String value() {
			return value;
		}
	}

	//-----------------------------------------------------------------------------------------------------------------
	// Appliers
	//-----------------------------------------------------------------------------------------------------------------

	/**
	 * Applies targeted {@link Query} annotations to a {@link org.apache.juneau.BeanContext.Builder}.
	 */
	public static class Applier extends AnnotationApplier<Query,BeanContext.Builder> {

		/**
		 * Constructor.
		 *
		 * @param vr The resolver for resolving values in annotations.
		 */
		public Applier(VarResolverSession vr) {
			super(Query.class, BeanContext.Builder.class, vr);
		}

		@Override
		public void apply(AnnotationInfo<Query> ai, BeanContext.Builder b) {
			Query a = ai.inner();
			if (isEmptyArray(a.on(), a.onClass()))
				return;
			b.annotations(a);
		}
	}

	//-----------------------------------------------------------------------------------------------------------------
	// Other
	//-----------------------------------------------------------------------------------------------------------------

	/**
	 * A collection of {@link Query @Query annotations}.
	 */
	@Documented
	@Target({METHOD,TYPE})
	@Retention(RUNTIME)
	@Inherited
	public static @interface Array {

		/**
		 * The child annotations.
		 *
		 * @return The annotation value.
		 */
		Query[] value();
	}
}