Allow bean factory initialization to have a more flexible signature

This commit allows bean factory initialization to use a more flexible
signature than just consuming the DefaultListableBeanFactory. The
environment and the resource loader can now be specified if necessary.

See gh-29005

spring-context/src/test/java/org/springframework/context/aot/ApplicationContextInitializationCodeGeneratorTests.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2002-2022 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.context.aot;
+
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import org.springframework.aot.generate.MethodReference.ArgumentCodeGenerator;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.beans.factory.support.AbstractBeanFactory;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.Environment;
+import org.springframework.core.env.StandardEnvironment;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.javapoet.ClassName;
+import org.springframework.javapoet.CodeBlock;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ApplicationContextInitializationCodeGenerator}.
+ *
+ * @author Stephane Nicoll
+ */
+class ApplicationContextInitializationCodeGeneratorTests {
+
+	private static final ArgumentCodeGenerator argCodeGenerator = ApplicationContextInitializationCodeGenerator.
+			createInitializerMethodArgumentCodeGenerator();
+
+	@ParameterizedTest
+	@MethodSource("methodArguments")
+	void argumentsForSupportedTypesAreResolved(Class<?> target, String expectedArgument) {
+		CodeBlock code = CodeBlock.of(expectedArgument);
+		assertThat(argCodeGenerator.generateCode(ClassName.get(target))).isEqualTo(code);
+	}
+
+	@Test
+	void argumentForUnsupportedBeanFactoryIsNotResolved() {
+		assertThat(argCodeGenerator.generateCode(ClassName.get(AbstractBeanFactory.class))).isNull();
+	}
+
+	@Test
+	void argumentForUnsupportedEnvironmentIsNotResolved() {
+		assertThat(argCodeGenerator.generateCode(ClassName.get(StandardEnvironment.class))).isNull();
+	}
+
+	static Stream<Arguments> methodArguments() {
+		String applicationContext = "applicationContext";
+		String environment = applicationContext + ".getConfigurableEnvironment()";
+		return Stream.of(
+				Arguments.of(DefaultListableBeanFactory.class, "beanFactory"),
+				Arguments.of(ConfigurableListableBeanFactory.class, "beanFactory"),
+				Arguments.of(ConfigurableEnvironment.class, environment),
+				Arguments.of(Environment.class, environment),
+				Arguments.of(ResourceLoader.class, applicationContext));
+	}
+
+}