DATACMNS-456 - Introduced getAttribute(String) on RepositoryConfigurationSupport.

RepositoryConfigurationSupport now has a getAttribute(String) method to lookup String attributes on XML elements and annotations. The XML implementation converts the given attribute name in a lower-case, dashed representation for the lookup.

RepositoryConfigurationExtensionSupport now ha a generic postProcess(…) method to allow implementations that only need to work with String attributes unify their customizations into that single method.

src/main/java/org/springframework/data/repository/config/AnnotationRepositoryConfigurationSource.java

@@ -257,6 +257,17 @@ public class AnnotationRepositoryConfigurationSource extends RepositoryConfigura
 		return attributes.containsKey(CONSIDER_NESTED_REPOSITORIES) && attributes.getBoolean(CONSIDER_NESTED_REPOSITORIES);
 	}
 
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.config.RepositoryConfigurationSource#getAttribute(java.lang.String)
+	 */
+	@Override
+	public String getAttribute(String name) {
+
+		String attribute = attributes.getString(name);
+		return StringUtils.hasText(attribute) ? attribute : null;
+	}
+
 	/**
 	 * Safely reads the {@code pattern} attribute from the given {@link AnnotationAttributes} and returns an empty list if
 	 * the attribute is not present.

src/main/java/org/springframework/data/repository/config/RepositoryConfigurationDelegate.java

@@ -90,6 +90,8 @@ public class RepositoryConfigurationDelegate {
 
 			BeanDefinitionBuilder definitionBuilder = builder.build(configuration);
 
+			extension.postProcess(definitionBuilder, configurationSource);
+
 			if (isXml) {
 				extension.postProcess(definitionBuilder, (XmlRepositoryConfigurationSource) configurationSource);
 			} else {

src/main/java/org/springframework/data/repository/config/RepositoryConfigurationExtension.java

@@ -64,6 +64,14 @@ public interface RepositoryConfigurationExtension {
 	 */
 	void registerBeansForRoot(BeanDefinitionRegistry registry, RepositoryConfigurationSource configurationSource);
 
+	/**
+	 * Callback to post process the {@link BeanDefinition} and tweak the configuration if necessary.
+	 * 
+	 * @param builder will never be {@literal null}.
+	 * @param config will never be {@literal null}.
+	 */
+	void postProcess(BeanDefinitionBuilder builder, RepositoryConfigurationSource config);
+
 	/**
 	 * Callback to post process the {@link BeanDefinition} built from annotations and tweak the configuration if
 	 * necessary.

src/main/java/org/springframework/data/repository/config/RepositoryConfigurationExtensionSupport.java

@@ -84,6 +84,14 @@ public abstract class RepositoryConfigurationExtensionSupport implements Reposit
 	 */
 	protected abstract String getModulePrefix();
 
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.config.RepositoryConfigurationExtension#postProcess(org.springframework.beans.factory.support.BeanDefinitionBuilder, org.springframework.data.repository.config.RepositoryConfigurationSource)
+	 */
+	public void postProcess(BeanDefinitionBuilder builder, RepositoryConfigurationSource source) {
+
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see org.springframework.data.repository.config.RepositoryConfigurationExtension#postProcess(org.springframework.beans.factory.support.BeanDefinitionBuilder, org.springframework.data.repository.config.AnnotationRepositoryConfigurationSource)

src/main/java/org/springframework/data/repository/config/RepositoryConfigurationSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2014 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.
@@ -78,4 +78,14 @@ public interface RepositoryConfigurationSource {
 	 * @return
 	 */
 	Collection<BeanDefinition> getCandidates(ResourceLoader loader);
+
+	/**
+	 * Returns the value for the {@link String} attribute with the given name. The name is expected to be handed in
+	 * camel-case.
+	 * 
+	 * @param name must not be {@literal null} or empty.
+	 * @return the attribute with the given name or {@literal null} if not configured or empty.
+	 * @since 1.8
+	 */
+	String getAttribute(String name);
 }

src/main/java/org/springframework/data/repository/config/XmlRepositoryConfigurationSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2014 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.
@@ -16,6 +16,8 @@
 package org.springframework.data.repository.config;
 
 import java.util.Arrays;
+import java.util.List;
+import java.util.regex.Pattern;
 
 import org.springframework.beans.factory.xml.ParserContext;
 import org.springframework.core.env.Environment;
@@ -42,6 +44,8 @@ public class XmlRepositoryConfigurationSource extends RepositoryConfigurationSou
 	private static final String REPOSITORY_FACTORY_BEAN_CLASS_NAME = "factory-class";
 	private static final String CONSIDER_NESTED_REPOSITORIES = "consider-nested-repositories";
 
+	private static final Pattern CAMEL_CASE_PARTS = Pattern.compile("(?<!(^|[A-Z]))(?=[A-Z])|(?<!^)(?=[A-Z][a-z])");
+
 	private final Element element;
 	private final ParserContext context;
 
@@ -161,4 +165,18 @@ public class XmlRepositoryConfigurationSource extends RepositoryConfigurationSou
 		String attribute = getNullDefaultedAttribute(element, CONSIDER_NESTED_REPOSITORIES);
 		return attribute != null && Boolean.parseBoolean(attribute);
 	}
+
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.config.RepositoryConfigurationSource#getAttribute(java.lang.String)
+	 */
+	@Override
+	public String getAttribute(String name) {
+
+		List<String> parts = Arrays.asList(CAMEL_CASE_PARTS.split(name));
+		String xmlAttributeName = StringUtils.collectionToDelimitedString(parts, "-");
+		String attribute = element.getAttribute(xmlAttributeName);
+
+		return StringUtils.hasText(attribute) ? attribute : null;
+	}
 }