Add String functions(lower)

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

@@ -1042,6 +1042,22 @@ open class Jpql : JpqlDsl {
         return Expressions.type(path.toPath())
     }
 
+    /**
+     * Creates an expression that represents the string in lowercase.
+     */
+    @SinceJdsl("3.0.0")
+    fun lower(string: String): Expression<String> {
+        return Expressions.lower(Expressions.value(string))
+    }
+
+    /**
+     * Creates an expression that represents the string in lowercase.
+     */
+    @SinceJdsl("3.0.0")
+    fun lower(string: Expressionable<String>): Expression<String> {
+        return Expressions.lower(string.toExpression())
+    }
+
     /**
      * Creates an expression that represents the length of the string as an integer.
      */

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

@@ -0,0 +1,47 @@
+package com.linecorp.kotlinjdsl.dsl.jpql.expression
+
+import com.linecorp.kotlinjdsl.dsl.jpql.queryPart
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expression
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expressions
+import org.assertj.core.api.WithAssertions
+import org.junit.jupiter.api.Test
+
+class LowerDslTest : WithAssertions {
+    private val string1 = "string1"
+
+    private val stringExpression1 = Expressions.value("string1")
+
+    @Test
+    fun `lower() with a string`() {
+        // when
+        val expression = queryPart {
+            lower(string1)
+        }.toExpression()
+
+        val actual: Expression<String> = expression // for type check
+
+        // then
+        val expected = Expressions.lower(
+            Expressions.value(string1),
+        )
+
+        assertThat(actual).isEqualTo(expected)
+    }
+
+    @Test
+    fun `lower() with a string expression`() {
+        // when
+        val expression = queryPart {
+            lower(stringExpression1)
+        }.toExpression()
+
+        val actual: Expression<String> = expression // for type check
+
+        // then
+        val expected = Expressions.lower(
+            stringExpression1,
+        )
+
+        assertThat(actual).isEqualTo(expected)
+    }
+}

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

@@ -17,6 +17,7 @@ import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlFunction
 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.JpqlLocate
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLower
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMax
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMin
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMinus
@@ -414,6 +415,14 @@ object Expressions {
         return JpqlPathType(path)
     }
 
+    /**
+     * Creates an expression that represents the string in lowercase.
+     */
+    @SinceJdsl("3.0.0")
+    fun lower(string: Expression<String>): Expression<String> {
+        return JpqlLower(string)
+    }
+
     /**
      * Creates an expression that represents the length of the string as an integer.
      */

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

@@ -0,0 +1,9 @@
+package com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl
+
+import com.linecorp.kotlinjdsl.Internal
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expression
+
+@Internal
+data class JpqlLower internal constructor(
+    val string: Expression<String>,
+) : Expression<String>

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

@@ -19,6 +19,7 @@ import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlFunction
 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.JpqlLocate
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLower
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMax
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMin
 import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlMinus
@@ -598,6 +599,19 @@ class ExpressionsTest : WithAssertions {
         assertThat(actual).isEqualTo(expected)
     }
 
+    @Test
+    fun lower() {
+        // when
+        val actual = Expressions.lower(stringExpression1)
+
+        // then
+        val expected = JpqlLower(
+            stringExpression1,
+        )
+
+        assertThat(actual).isEqualTo(expected)
+    }
+
     @Test
     fun length() {
         // when

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

@@ -66,6 +66,7 @@ import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLessThanSerialize
 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.JpqlLocateSerializer
+import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlLowerSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlMaxSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlMinSerializer
 import com.linecorp.kotlinjdsl.render.jpql.serializer.impl.JpqlMinusSerializer
@@ -299,6 +300,7 @@ private class DefaultModule : JpqlRenderModule {
             JpqlLikeSerializer(),
             JpqlLiteralSerializer(),
             JpqlLocateSerializer(),
+            JpqlLowerSerializer(),
             JpqlMaxSerializer(),
             JpqlMinSerializer(),
             JpqlMinusSerializer(),

render/jpql/src/main/kotlin/com/linecorp/kotlinjdsl/render/jpql/serializer/impl/JpqlLowerSerializer.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.JpqlLower
+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 JpqlLowerSerializer : JpqlSerializer<JpqlLower> {
+    override fun handledType(): KClass<JpqlLower> {
+        return JpqlLower::class
+    }
+
+    override fun serialize(part: JpqlLower, writer: JpqlWriter, context: RenderContext) {
+        val delegate = context.getValue(JpqlRenderSerializer)
+
+        writer.write("LOWER")
+
+        writer.writeParentheses {
+            delegate.serialize(part.string, writer, context)
+        }
+    }
+}

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

@@ -0,0 +1,53 @@
+package com.linecorp.kotlinjdsl.render.jpql.serializer.impl
+
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.Expressions
+import com.linecorp.kotlinjdsl.querymodel.jpql.expression.impl.JpqlLower
+import com.linecorp.kotlinjdsl.render.TestRenderContext
+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 JpqlLowerSerializerTest : WithAssertions {
+    private val sut = JpqlLowerSerializer()
+
+    @MockK
+    private lateinit var writer: JpqlWriter
+
+    @MockK
+    private lateinit var serializer: JpqlRenderSerializer
+
+    private val stringExpression1 = Expressions.value("string1")
+
+    @Test
+    fun handledType() {
+        // when
+        val actual = sut.handledType()
+
+        // then
+        assertThat(actual).isEqualTo(JpqlLower::class)
+    }
+
+    @Test
+    fun serialize() {
+        // given
+        val part = Expressions.lower(
+            stringExpression1,
+        )
+        val context = TestRenderContext(serializer)
+
+        // when
+        sut.serialize(part as JpqlLower, writer, context)
+
+        // then
+        verifySequence {
+            writer.write("LOWER")
+            writer.writeParentheses(any())
+            serializer.serialize(stringExpression1, writer, context)
+        }
+    }
+}