Reintroduce fluent API for RangeQuery

src/Elastic.Clients.Elasticsearch.Shared/Types/QueryDsl/RangeQuery.cs

@@ -0,0 +1,90 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+#if ELASTICSEARCH_SERVERLESS
+using Elastic.Clients.Elasticsearch.Serverless.Fluent;
+#else
+using Elastic.Clients.Elasticsearch.Fluent;
+#endif
+
+#if ELASTICSEARCH_SERVERLESS
+namespace Elastic.Clients.Elasticsearch.Serverless.QueryDsl;
+#else
+namespace Elastic.Clients.Elasticsearch.QueryDsl;
+#endif
+
+// TODO: This should be removed after implementing descriptor generation for union types
+
+public sealed partial class QueryDescriptor<TDocument>
+{
+	public QueryDescriptor<TDocument> Range(Action<RangeQueryDescriptor<TDocument>> configure) => ProxiedSet(configure, "range");
+
+	private QueryDescriptor<TDocument> ProxiedSet<T>(Action<T> descriptorAction, string variantName) where T : ProxiedDescriptor<T>
+	{
+		var descriptor = (T)Activator.CreateInstance(typeof(T), true);
+		descriptorAction?.Invoke(descriptor);
+
+		return Set(descriptor.Result, variantName);
+	}
+}
+
+public sealed partial class QueryDescriptor
+{
+	public QueryDescriptor Range(Action<RangeQueryDescriptor> configure) => ProxiedSet(configure, "range");
+	public QueryDescriptor Range<TDocument>(Action<RangeQueryDescriptor<TDocument>> configure) => ProxiedSet(configure, "range");
+
+	private QueryDescriptor ProxiedSet<T>(Action<T> descriptorAction, string variantName) where T : ProxiedDescriptor<T>
+	{
+		var descriptor = (T)Activator.CreateInstance(typeof(T), true);
+		descriptorAction?.Invoke(descriptor);
+
+		return Set(descriptor.Result, variantName);
+	}
+}
+
+public abstract class ProxiedDescriptor<T> : Descriptor<T>
+	where T : Descriptor<T>
+{
+	internal Descriptor Result { get; set; }
+
+	protected T SetResult<TD>(Action<TD> descriptorAction) where TD : Descriptor
+	{
+		var descriptor = (TD)Activator.CreateInstance(typeof(TD), true);
+		descriptorAction?.Invoke(descriptor);
+		Result = descriptor;
+		return Self;
+	}
+}
+
+public sealed class RangeQueryDescriptor<TDocument> : ProxiedDescriptor<RangeQueryDescriptor<TDocument>>
+{
+	public RangeQueryDescriptor<TDocument> NumberRange(Action<NumberRangeQueryDescriptor<TDocument>> configure) =>
+		SetResult(configure);
+
+	public RangeQueryDescriptor<TDocument> DateRange(Action<DateRangeQueryDescriptor<TDocument>> configure) =>
+		SetResult(configure);
+}
+
+public sealed class RangeQueryDescriptor : ProxiedDescriptor<RangeQueryDescriptor>
+{
+	public RangeQueryDescriptor NumberRange(Action<NumberRangeQueryDescriptor> configure) => SetResult(configure);
+
+	public RangeQueryDescriptor NumberRange<TDocument>(Action<NumberRangeQueryDescriptor<TDocument>> configure) => SetResult(configure);
+
+	public RangeQueryDescriptor DateRange(Action<DateRangeQueryDescriptor> configure) => SetResult(configure);
+
+	public RangeQueryDescriptor DateRange<TDocument>(Action<DateRangeQueryDescriptor<TDocument>> configure) => SetResult(configure);
+}
+
+public sealed partial class NumberRangeQuery
+{
+	public static implicit operator Query(NumberRangeQuery numberRangeQuery) => Query.Range(new RangeQuery(numberRangeQuery));
+}
+
+public sealed partial class DateRangeQuery
+{
+	public static implicit operator Query(DateRangeQuery dateRangeQuery) => Query.Range(new RangeQuery(dateRangeQuery));
+}