Add an env accessor to BeanDefinitionContext

Issue: SPR-15755

Author: sdeleuze

spring-context/src/main/kotlin/org/springframework/context/support/BeanDefinitionDsl.kt

@@ -17,7 +17,6 @@
 package org.springframework.context.support
 
 import org.springframework.beans.factory.config.BeanDefinitionCustomizer
-import org.springframework.context.ApplicationContext
 import org.springframework.core.env.ConfigurableEnvironment
 import java.util.function.Supplier
 
@@ -38,12 +37,20 @@ open class BeanDefinitionDsl(val condition: (ConfigurableEnvironment) -> Boolean
 		PROTOTYPE
 	}
 
-	class BeanDefinitionContext(val context: ApplicationContext) {
+	class BeanDefinitionContext(val context: GenericApplicationContext) {
 
+		
 		inline fun <reified T : Any> ref(name: String? = null) : T = when (name) {
 			null -> context.getBean(T::class.java)
 			else -> context.getBean(name, T::class.java)
 		}
+
+		/**
+		 * Get the [ConfigurableEnvironment] associated to the underlying [GenericApplicationContext].
+		 */
+		val env : ConfigurableEnvironment
+			get() = context.environment
+		
 	}
 
 	/**

spring-context/src/test/kotlin/org/springframework/context/support/BeanDefinitionDslTests.kt

@@ -21,6 +21,7 @@ import org.junit.Test
 import org.springframework.beans.factory.NoSuchBeanDefinitionException
 import org.springframework.beans.factory.getBean
 import org.springframework.context.support.BeanDefinitionDsl.*
+import org.springframework.core.env.SimpleCommandLinePropertySource
 
 class BeanDefinitionDslTests {
 
@@ -75,13 +76,16 @@ class BeanDefinitionDslTests {
 		val beans = beans {
 			bean<Foo>()
 			bean<Bar>("bar")
+			bean { FooFoo(it.env.getProperty("name")) }
 			environment({it.activeProfiles.contains("baz")}) {
 				bean { Baz(it.ref()) }
 				bean { Baz(it.ref("bar")) }
 			}
 		}
 
-		val context = GenericApplicationContext()
+		val context = GenericApplicationContext().apply { 
+			environment.propertySources.addFirst(SimpleCommandLinePropertySource("--name=foofoo"))
+		}
 		beans.invoke(context)
 		context.refresh()
 
@@ -92,10 +96,13 @@ class BeanDefinitionDslTests {
 			fail("Expect NoSuchBeanDefinitionException to be thrown")
 		}
 		catch(ex: NoSuchBeanDefinitionException) { null }
+		val foofoo = context.getBean<FooFoo>()
+		assertEquals("foofoo", foofoo.name)
 	}
 
 }
 
 class Foo
 class Bar
 class Baz(val bar: Bar)
+class FooFoo(val name: String)