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ArrayFunction.cs
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/
ArrayFunction.cs
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//
// ArrayFunction.cs
//
// Copyright (c) 2017 Couchbase, Inc All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
using Couchbase.Lite.Internal.Logging;
using Couchbase.Lite.Internal.Query;
using Couchbase.Lite.Util;
using JetBrains.Annotations;
namespace Couchbase.Lite.Query
{
/// <summary>
/// A class for generating query functions that operate on
/// array types
/// </summary>
public static class ArrayFunction
{
#region Constants
private const string Tag = nameof(ArrayFunction);
#endregion
#region Public Methods
/// <summary>
/// Creates a function that will query if the given array expression contains
/// the given element
/// </summary>
/// <param name="expression">An expression that evaluates to an array (otherwise the query will
/// fail)</param>
/// <param name="value">The element to search for (either an expression or literal)</param>
/// <returns>A function that will return true if the array contains the element, or false
/// if it does not</returns>
[NotNull]
public static IExpression Contains([NotNull]IExpression expression, [NotNull]IExpression value) =>
new QueryCompoundExpression("ARRAY_CONTAINS()",
CBDebug.MustNotBeNull(WriteLog.To.Query, Tag, nameof(expression), expression),
CBDebug.MustNotBeNull(WriteLog.To.Query, Tag, nameof(value), value));
/// <summary>
/// Creates a function that will get the length of an array
/// in question
/// </summary>
/// <param name="expression">The expression to usem when calculating (must evaluate to an array type)
/// the result</param>
/// <returns>A function that will get the length of the array in question</returns>
[NotNull]
public static IExpression Length([NotNull]IExpression expression) =>
new QueryCompoundExpression("ARRAY_LENGTH()",
CBDebug.MustNotBeNull(WriteLog.To.Query, Tag, nameof(expression), expression));
#endregion
}
}