extension function for Chatclient.CalLResponseSpec.entity(Class<?>) and Kotlin

spring-ai-core/src/main/kotlin/org/springframework/ai/chat/client/ChatClientExtensions.kt

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+/*
+ * Copyright 2023-2024 the original author or authors.
+ *
+ * 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
+ *
+ *      https://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.
+ */
+
+package org.springframework.ai.chat.client
+
+/**
+ * Extension for [ChatClient] providing a `entity<Foo>()` variant.
+ *
+ * @author Josh Long
+ */
+
+inline fun <reified T> ChatClient.CallResponseSpec.entity(): T = entity(T::class.java) as T

spring-ai-core/src/test/kotlin/org/springframework/ai/chat/client/ChatClientExtensionsTests.kt

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+/*
+ * Copyright 2023-2024 the original author or authors.
+ *
+ * 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
+ *
+ *      https://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.
+ */
+
+package org.springframework.ai.chat.client
+
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+import org.junit.jupiter.api.Test
+
+class ChatClientExtensionsTests {
+
+	private val crs = mockk<ChatClient.CallResponseSpec>()
+
+	data class Joke(val setup: String, val punchline: String)
+
+	@Test
+	fun withEntityType() {
+		val joke = Joke(
+			setup = "Why did the scarecrow win an award?",
+			punchline = "Because he was outstanding in his field!"
+		)
+		every { crs.entity(any<Class<*>>()) } returns joke 
+		crs.entity<Joke>()
+		verify { crs.entity(Joke::class.java) }
+	}
+}