Revert #processConfigBeanDefinitions to 3.0.x API

Revert signature of
ConfigurationClassPostProcessor#processConfigBeanDefinitions to its form
found in the 3.0.x line.  Refactorings made during 3.1 development
caused otherwise package-private types such as
ConfigurationClassBeanDefinitionReader to escape through this public
method, causing issues for STS as well as being a general design issue.

Upon review, the refactorings could easily be backed out in favor of a
simpler approach, and this has been done.

This also means that ConfigurationClassBeanDefinitionReader can return
to package-private visibility, and this change has been made as well.

Issue: SPR-8200

org.springframework.context/src/main/java/org/springframework/context/annotation/ConfigurationClassBeanDefinitionReader.java

@@ -64,7 +64,7 @@ import org.springframework.util.StringUtils;
  * @since 3.0
  * @see ConfigurationClassParser
  */
-public class ConfigurationClassBeanDefinitionReader {
+class ConfigurationClassBeanDefinitionReader {
 
 	private static final Log logger = LogFactory.getLog(ConfigurationClassBeanDefinitionReader.class);
 

org.springframework.context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -27,8 +27,6 @@ import java.util.Map;
 import java.util.Set;
 import java.util.Stack;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.config.BeanDefinitionHolder;
 import org.springframework.beans.factory.parsing.Location;
@@ -36,9 +34,7 @@ import org.springframework.beans.factory.parsing.Problem;
 import org.springframework.beans.factory.parsing.ProblemReporter;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.core.annotation.AnnotationUtils;
-import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.Environment;
-import org.springframework.core.env.MutablePropertySources;
 import org.springframework.core.env.PropertySource;
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.core.io.ResourcePropertySource;
@@ -70,8 +66,6 @@ import org.springframework.util.StringUtils;
  */
 class ConfigurationClassParser {
 
-	private static final Log logger = LogFactory.getLog(ConfigurationClassParser.class);
-
 	private final MetadataReaderFactory metadataReaderFactory;
 
 	private final ProblemReporter problemReporter;
@@ -333,12 +327,10 @@ class ConfigurationClassParser {
 
 		public CircularImportProblem(ConfigurationClass attemptedImport, Stack<ConfigurationClass> importStack, AnnotationMetadata metadata) {
 			super(String.format("A circular @Import has been detected: " +
-			             "Illegal attempt by @Configuration class '%s' to import class '%s' as '%s' is " +
-			             "already present in the current import stack [%s]",
-			             importStack.peek().getSimpleName(), attemptedImport.getSimpleName(),
-			             attemptedImport.getSimpleName(), importStack),
-			      new Location(importStack.peek().getResource(), metadata)
-			);
+					"Illegal attempt by @Configuration class '%s' to import class '%s' as '%s' is " +
+					"already present in the current import stack [%s]", importStack.peek().getSimpleName(),
+					attemptedImport.getSimpleName(), attemptedImport.getSimpleName(), importStack),
+					new Location(importStack.peek().getResource(), metadata));
 		}
 	}
 

org.springframework.context/src/main/java/org/springframework/context/annotation/ConfigurationClassPostProcessor.java

@@ -196,8 +196,7 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 	 * Find and process all @Configuration classes in the given registry.
 	 */
 	private void processConfigurationClasses(BeanDefinitionRegistry registry) {
-		ConfigurationClassBeanDefinitionReader reader = getConfigurationClassBeanDefinitionReader(registry);
-		processConfigBeanDefinitions(reader, registry);
+		processConfigBeanDefinitions(registry);
 		enhanceConfigurationClasses((ConfigurableListableBeanFactory)registry);
 	}
 
@@ -213,7 +212,7 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 	 * Build and validate a configuration model based on the registry of
 	 * {@link Configuration} classes.
 	 */
-	public void processConfigBeanDefinitions(ConfigurationClassBeanDefinitionReader reader, BeanDefinitionRegistry registry) {
+	public void processConfigBeanDefinitions(BeanDefinitionRegistry registry) {
 		Set<BeanDefinitionHolder> configCandidates = new LinkedHashSet<BeanDefinitionHolder>();
 		for (String beanName : registry.getBeanDefinitionNames()) {
 			BeanDefinition beanDef = registry.getBeanDefinition(beanName);
@@ -262,7 +261,7 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 		}
 
 		// Read the model and create bean definitions based on its content
-		reader.loadBeanDefinitions(parser.getConfigurationClasses());
+		this.getConfigurationClassBeanDefinitionReader(registry).loadBeanDefinitions(parser.getConfigurationClasses());
 
 		// Register the ImportRegistry as a bean in order to support ImportAware @Configuration classes
 		if (registry instanceof SingletonBeanRegistry) {