StringFilter IsEmpty and IsNotEmpty checks.

enisn · Jan 28, 2022 · 1851ded · 1851ded
1 parent a363044
commit 1851ded
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diff --git a/src/AutoFilterer/Types/StringFilter.cs b/src/AutoFilterer/Types/StringFilter.cs
@@ -66,6 +66,16 @@ public class StringFilter : IFilterableType
     /// Provides parameter to check is not null.
     /// </summary>
     public virtual bool? IsNotNull { get; set; }
+
+    /// <summary>
+    /// Provides parameter to check is empty string.
+    /// </summary>
+    public virtual bool? IsEmpty { get; set; }
+
+    /// <summary>
+    /// Provides parameter to check is not empty string.
+    /// </summary>
+    public virtual bool? IsNotEmpty { get; set; }
 
     /// <summary>
     /// <inheritdoc />
@@ -114,6 +124,31 @@ public virtual Expression BuildExpression(Expression expressionBody, PropertyInf
         if (NotEndsWith != null)
             expression = expression.Combine(Expression.Not(new StringFilterOptionsAttribute(StringFilterOption.EndsWith) { Comparison = Compare }.BuildExpression(expressionBody, targetProperty, filterProperty, NotEndsWith)), CombineWith);
 
+
+        if (IsEmpty != null)
+        {
+            if (IsEmpty.Value)
+            { 
+                expression = expression.Combine(new StringFilterOptionsAttribute(StringFilterOption.Equals) { Comparison = Compare }.BuildExpression(expressionBody, targetProperty, filterProperty, ""), CombineWith);
+            }
+            else
+            {
+                expression = expression.Combine(Expression.Not(new StringFilterOptionsAttribute(StringFilterOption.Equals) { Comparison = Compare }.BuildExpression(expressionBody, targetProperty, filterProperty, "")), CombineWith);
+            }
+        }
+
+        if (IsNotEmpty != null)
+        {
+            if (IsNotEmpty.Value)
+            {
+                expression = expression.Combine(Expression.Not(new StringFilterOptionsAttribute(StringFilterOption.Equals) { Comparison = Compare }.BuildExpression(expressionBody, targetProperty, filterProperty, "")), CombineWith);
+            }
+            else
+            {
+                expression = expression.Combine(new StringFilterOptionsAttribute(StringFilterOption.Equals) { Comparison = Compare }.BuildExpression(expressionBody, targetProperty, filterProperty, ""), CombineWith);
+            }
+        }
+
         return expression;
     }
 }
diff --git a/tests/AutoFilterer.Tests/Types/StringFilterTests.cs b/tests/AutoFilterer.Tests/Types/StringFilterTests.cs
@@ -171,4 +171,66 @@ public void BuildExpression_TitleWithIsNotNull_ShouldMatchCount(List<Book> data)
         foreach (var item in actualResult)
             Assert.Contains(item, result);
     }
+
+    [Theory, AutoMoqData(count: 64)]
+    public void BuildExpression_TitleWithIsEmpty_ShouldMatchCount(List<Book> data)
+    {
+        for (var i = 0; i < 5; i++)
+        {
+            data[i].Title = "";
+        }
+
+        // Arrange
+        var filter = new BookFilter_StringFilter_Title
+        {
+            Title = new StringFilter
+            {
+                IsEmpty = true
+            }
+        };
+
+        // Act
+        var query = data.AsQueryable().ApplyFilter(filter);
+        var result = query.ToList();
+
+        // Assert
+        var actualResult = data.AsQueryable().Where(x => x.Title == "").ToList();
+
+        Assert.Equal(actualResult.Count, result.Count);
+        Assert.Equal(5, actualResult.Count);
+        Assert.Equal(5, result.Count);
+        foreach (var item in actualResult)
+            Assert.Contains(item, result);
+    }
+
+    [Theory, AutoMoqData(count: 64)]
+    public void BuildExpression_TitleWithIsNotEmpty_ShouldMatchCount(List<Book> data)
+    {
+        for (var i = 0; i < 5; i++)
+        {
+            data[i].Title = "";
+        }
+
+        // Arrange
+        var filter = new BookFilter_StringFilter_Title
+        {
+            Title = new StringFilter
+            {
+                IsNotEmpty = true
+            }
+        };
+
+        // Act
+        var query = data.AsQueryable().ApplyFilter(filter);
+        var result = query.ToList();
+
+        // Assert
+        var actualResult = data.AsQueryable().Where(x => x.Title != "").ToList();
+
+        Assert.Equal(actualResult.Count, result.Count);
+        Assert.Equal(64 - 5, actualResult.Count);
+        Assert.Equal(64 - 5, result.Count);
+        foreach (var item in actualResult)
+            Assert.Contains(item, result);
+    }
 }