Add ifPresent utility methods on RuntimeHints

This commit adds a utility method to register a type for reflection if
it is available on the classpath. It also adds a method to register a
resource pattern if a given location is available.

Closes gh-28617

spring-core/src/test/java/org/springframework/aot/hint/ReflectionHintsTests.java

@@ -27,6 +27,8 @@ import org.springframework.lang.Nullable;
 import org.springframework.util.ReflectionUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verifyNoInteractions;
 
 /**
  * Tests for {@link ReflectionHints}.
@@ -45,6 +47,23 @@ class ReflectionHintsTests {
 				typeWithMemberCategories(String.class, MemberCategory.DECLARED_FIELDS));
 	}
 
+	@Test
+	void registerTypeIfPresentRegisterExistingClass() {
+		this.reflectionHints.registerTypeIfPresent(null, String.class.getName(),
+				hint -> hint.withMembers(MemberCategory.DECLARED_FIELDS));
+		assertThat(this.reflectionHints.typeHints()).singleElement().satisfies(
+				typeWithMemberCategories(String.class, MemberCategory.DECLARED_FIELDS));
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void registerTypeIfPresentIgnoreMissingClass() {
+		Consumer<TypeHint.Builder> hintBuilder = mock(Consumer.class);
+		this.reflectionHints.registerTypeIfPresent(null, "com.example.DoesNotExist", hintBuilder);
+		assertThat(this.reflectionHints.typeHints()).isEmpty();
+		verifyNoInteractions(hintBuilder);
+	}
+
 	@Test
 	void getTypeUsingType() {
 		this.reflectionHints.registerType(TypeReference.of(String.class),

spring-core/src/test/java/org/springframework/aot/hint/ResourceHintsTests.java

@@ -26,6 +26,8 @@ import org.junit.jupiter.api.Test;
 import org.springframework.aot.hint.ResourceHintsTests.Nested.Inner;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verifyNoInteractions;
 
 /**
  * Tests for {@link ResourceHints}.
@@ -91,6 +93,23 @@ class ResourceHintsTests {
 				List.of("com/example/to-ignore.properties")));
 	}
 
+	@Test
+	void registerIfPresentRegisterExistingLocation() {
+		this.resourceHints.registerPatternIfPresent(null, "META-INF/",
+				resourceHint -> resourceHint.includes("com/example/*.properties"));
+		assertThat(this.resourceHints.resourcePatterns()).singleElement().satisfies(
+				patternOf("com/example/*.properties"));
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void registerIfPresentIgnoreMissingLocation() {
+		Consumer<ResourcePatternHints.Builder> hintBuilder = mock(Consumer.class);
+		this.resourceHints.registerPatternIfPresent(null, "location/does-not-exist/", hintBuilder);
+		assertThat(this.resourceHints.resourcePatterns()).isEmpty();
+		verifyNoInteractions(hintBuilder);
+	}
+
 	@Test
 	void registerResourceBundle() {
 		this.resourceHints.registerResourceBundle("com.example.message");