Support Arithmetic function LN

docs/en/jpql-with-kotlin-jdsl/expressions.md

@@ -227,6 +227,7 @@ Use the following functions to build arithmetic functions:
 * CEILING (ceiling)
 * EXP (exp)
 * FLOOR (floor)
+* LN (ln)
 * ROUND (round)
 * SQRT (sqrt)
 
@@ -239,15 +240,15 @@ exp(path(Book::price))
 
 floor(path(Book::price))
 
+ln(path(Book::price))
+
 round(path(Book::price), 2)
 
 sqrt(path(Book::price))
 ```
 
 | Function | DSL function |
 |----------|--------------|
-| FLOOR    | not yet      |
-| LN       | not yet      |
 | MOD      | not yet      |
 | POWER    | not yet      |
 | SIGN     | not yet      |

docs/ko/jpql-with-kotlin-jdsl/expressions.md

@@ -223,6 +223,7 @@ locate("Book", path(Book::title))
 * CEILING (ceiling)
 * EXP (exp)
 * FLOOR (floor)
+* LN (ln)
 * ROUND (round)
 * SQRT (sqrt)
 
@@ -235,15 +236,15 @@ exp(path(Book::price))
 
 floor(path(Book::price))
 
+ln(path(Book::price))
+
 round(path(Book::price), 2)
 
 sqrt(path(Book::price))
 ```
 
 | Function | DSL function |
 |----------|--------------|
-| FLOOR    | not yet      |
-| LN       | not yet      |
 | MOD      | not yet      |
 | POWER    | not yet      |
 | SIGN     | not yet      |

dsl/jpql/src/main/kotlin/com/linecorp/kotlinjdsl/dsl/jpql/Jpql.kt

@@ -600,6 +600,22 @@ open class Jpql : JpqlDsl {
         return Expressions.floor(value.toExpression())
     }
 
+    /**
+     * Creates an expression that represents the natural logarithm of value.
+     */
+    @SinceJdsl("3.4.0")
+    fun <T : Any, V : Number> ln(expr: KProperty1<T, @Exact V>): Expression<Double> {
+        return Expressions.ln(Paths.path(expr))
+    }
+
+    /**
+     * Creates an expression that represents the natural logarithm of value.
+     */
+    @SinceJdsl("3.4.0")
+    fun <T : Number> ln(value: Expressionable<T>): Expression<Double> {
+        return Expressions.ln(value.toExpression())
+    }
+
     /**
      * Creates an expression that represents the rounding of the value to a specified scale.
      */

dsl/jpql/src/test/kotlin/com/linecorp/kotlinjdsl/dsl/jpql/expression/LnDslTest.kt

@@ -0,0 +1,47 @@
+package com.linecorp.kotlinjdsl.dsl.jpql.expression
+
+import com.linecorp.kotlinjdsl.dsl.jpql.entity.book.Book
+import com.linecorp.kotlinjdsl.dsl.jpql.queryPart
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expression
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expressions
+import com.linecorp.kotlinjdsl.querymodel.jpql.path.Paths
+import org.assertj.core.api.WithAssertions
+import org.junit.jupiter.api.Test
+
+class LnDslTest : WithAssertions {
+    private val expression1 = Paths.path(Book::salePrice)
+
+    @Test
+    fun `ln() with a property`() {
+        // when
+        val expression = queryPart {
+            ln(Book::price)
+        }.toExpression()
+
+        val actual: Expression<Double> = expression // for type check
+
+        // then
+        val expected = Expressions.ln(
+            value = Paths.path(Book::price),
+        )
+
+        assertThat(actual).isEqualTo(expected)
+    }
+
+    @Test
+    fun `ln() with a expression`() {
+        // when
+        val expression = queryPart {
+            ln(expression1)
+        }.toExpression()
+
+        val actual: Expression<Double> = expression // for type check
+
+        // then
+        val expected = Expressions.ln(
+            value = expression1,
+        )
+
+        assertThat(actual).isEqualTo(expected)
+    }
+}

query-model/jpql/src/main/kotlin/com/linecorp/kotlinjdsl/querymodel/jpql/expression/Expressions.kt

@@ -21,6 +21,7 @@ import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlFloor
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlFunctionExpression
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLength
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLiteral
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLn
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLocate
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLower
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMax
@@ -244,6 +245,14 @@ object Expressions {
         return JpqlFloor(value)
     }
 
+    /**
+     * Creates an expression that represents the natural logarithm of the value.
+     */
+    @SinceJdsl("3.4.0")
+    fun <T : Number> ln(value: Expression<T>): Expression<Double> {
+        return JpqlLn(value)
+    }
+
     /**
      * Creates an expression that represents the rounding of the specified value to a specified scale.
      */

query-model/jpql/src/main/kotlin/com/linecorp/kotlinjdsl/querymodel/jpql/expression/impl/JpqlLn.kt

@@ -0,0 +1,12 @@
+package com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl
+
+import com.linecorp.kotlinjdsl.Internal
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expression
+
+/**
+ * Expression that applies natural logarithm function to [value].
+ */
+@Internal
+data class JpqlLn<T : Number> internal constructor(
+    val value: Expression<T>,
+) : Expression<Double>

query-model/jpql/src/test/kotlin/com/linecorp/kotlinjdsl/querymodel/jpql/expression/ExpressionsTest.kt

@@ -23,6 +23,7 @@ import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlFloor
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlFunctionExpression
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLength
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLiteral
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLn
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLocate
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLower
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMax
@@ -390,6 +391,19 @@ class ExpressionsTest : WithAssertions {
         assertThat(actual).isEqualTo(expected)
     }
 
+    @Test
+    fun ln() {
+        // when
+        val actual = Expressions.ln(doubleExpression1)
+
+        // then
+        val expected = JpqlLn(
+            doubleExpression1,
+        )
+
+        assertThat(actual).isEqualTo(expected)
+    }
+
     @Test
     fun round() {
         // when

render/jpql/src/main/kotlin/com/linecorp/kotlinjdsl/render/jpql/JpqlRenderContext.kt

@@ -73,6 +73,7 @@ import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLessThanOrEqualTo
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLessThanSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLikeSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLiteralSerializer
+import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLnSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLocateSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLowerSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlMaxSerializer
@@ -324,6 +325,7 @@ private class DefaultModule : JpqlRenderModule {
             JpqlLessThanSerializer(),
             JpqlLikeSerializer(),
             JpqlLiteralSerializer(),
+            JpqlLnSerializer(),
             JpqlLocateSerializer(),
             JpqlLowerSerializer(),
             JpqlMaxSerializer(),

render/jpql/src/main/kotlin/com/linecorp/kotlinjdsl/render/jpql/serializer/impl/JpqlLnSerializer.kt

@@ -0,0 +1,26 @@
+package com.linecorp.kotlinjdsl.render.jpql.serializer.impl
+
+import com.linecorp.kotlinjdsl.Internal
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLn
+import com.linecorp.kotlinjdsl.render.RenderContext
+import com.linecorp.kotlinjdsl.render.jpql.serializer.JpqlRenderSerializer
+import com.linecorp.kotlinjdsl.render.jpql.serializer.JpqlSerializer
+import com.linecorp.kotlinjdsl.render.jpql.writer.JpqlWriter
+import kotlin.reflect.KClass
+
+@Internal
+class JpqlLnSerializer : JpqlSerializer<JpqlLn<*>> {
+    override fun handledType(): KClass<JpqlLn<*>> {
+        return JpqlLn::class
+    }
+
+    override fun serialize(part: JpqlLn<*>, writer: JpqlWriter, context: RenderContext) {
+        val delegate = context.getValue(JpqlRenderSerializer)
+
+        writer.write("LN")
+
+        writer.writeParentheses {
+            delegate.serialize(part.value, writer, context)
+        }
+    }
+}

render/jpql/src/test/kotlin/com/linecorp/kotlinjdsl/render/jpql/serializer/impl/JpqlLnSerializerTest.kt

@@ -0,0 +1,55 @@
+package com.linecorp.kotlinjdsl.render.jpql.serializer.impl
+
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expressions
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLn
+import com.linecorp.kotlinjdsl.querymodel.jpql.path.Paths
+import com.linecorp.kotlinjdsl.render.TestRenderContext
+import com.linecorp.kotlinjdsl.render.jpql.entity.book.Book
+import com.linecorp.kotlinjdsl.render.jpql.serializer.JpqlRenderSerializer
+import com.linecorp.kotlinjdsl.render.jpql.serializer.JpqlSerializerTest
+import com.linecorp.kotlinjdsl.render.jpql.writer.JpqlWriter
+import io.mockk.impl.annotations.MockK
+import io.mockk.verifySequence
+import org.assertj.core.api.WithAssertions
+import org.junit.jupiter.api.Test
+
+@JpqlSerializerTest
+class JpqlLnSerializerTest : WithAssertions {
+    private val sut = JpqlLnSerializer()
+
+    @MockK
+    private lateinit var writer: JpqlWriter
+
+    @MockK
+    private lateinit var serializer: JpqlRenderSerializer
+
+    private val expression1 = Paths.path(Book::price)
+
+    @Test
+    fun handledType() {
+        // when
+        val actual = sut.handledType()
+
+        // then
+        assertThat(actual).isEqualTo(JpqlLn::class)
+    }
+
+    @Test
+    fun serialize() {
+        // given
+        val part = Expressions.ln(
+            value = expression1,
+        )
+        val context = TestRenderContext(serializer)
+
+        // when
+        sut.serialize(part as JpqlLn<*>, writer, context)
+
+        // then
+        verifySequence {
+            writer.write("LN")
+            writer.writeParentheses(any())
+            serializer.serialize(expression1, writer, context)
+        }
+    }
+}