Introduce ClassMetadata#getMemberClassNames

ClassMetadata implementations can now introspect their member (nested)
classes. This will allow for automatic detection of nested
@Configuration types in SPR-8186.

Issue: SPR-8358,SPR-8186

org.springframework.core/src/test/java/org/springframework/core/type/AbstractClassMetadataMemberClassTests.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2002-2011 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
+ *
+ *      http://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.core.type;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+import org.junit.Test;
+
+/**
+ * Abstract base class for testing implementations of
+ * {@link ClassMetadata#getMemberClassNames()}.
+ *
+ * @author Chris Beams
+ * @since 3.1
+ */
+public abstract class AbstractClassMetadataMemberClassTests {
+
+	public abstract ClassMetadata getClassMetadataFor(Class<?> clazz);
+
+	@Test
+	public void withNoMemberClasses() {
+		ClassMetadata metadata = getClassMetadataFor(L0_a.class);
+		String[] nestedClasses = metadata.getMemberClassNames();
+		assertThat(nestedClasses, equalTo(new String[]{}));
+	}
+
+	public static class L0_a {
+	}
+
+
+	@Test
+	public void withPublicMemberClasses() {
+		ClassMetadata metadata = getClassMetadataFor(L0_b.class);
+		String[] nestedClasses = metadata.getMemberClassNames();
+		assertThat(nestedClasses, equalTo(new String[]{L0_b.L1.class.getName()}));
+	}
+
+	public static class L0_b {
+		public static class L1 { }
+	}
+
+
+	@Test
+	public void withNonPublicMemberClasses() {
+		ClassMetadata metadata = getClassMetadataFor(L0_c.class);
+		String[] nestedClasses = metadata.getMemberClassNames();
+		assertThat(nestedClasses, equalTo(new String[]{L0_c.L1.class.getName()}));
+	}
+
+	public static class L0_c {
+		private static class L1 { }
+	}
+
+
+	@Test
+	public void againstMemberClass() {
+		ClassMetadata metadata = getClassMetadataFor(L0_b.L1.class);
+		String[] nestedClasses = metadata.getMemberClassNames();
+		assertThat(nestedClasses, equalTo(new String[]{}));
+	}
+}

org.springframework.core/src/test/java/org/springframework/core/type/StandardClassMetadataMemberClassTests.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2002-2011 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
+ *
+ *      http://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.core.type;
+
+/**
+ * @author Chris Beams
+ * @since 3.1
+ * @see AbstractClassMetadataMemberClassTests
+ */
+public class StandardClassMetadataMemberClassTests
+		extends AbstractClassMetadataMemberClassTests {
+
+	@Override
+	public ClassMetadata getClassMetadataFor(Class<?> clazz) {
+		return new StandardClassMetadata(clazz);
+	}
+
+}

org.springframework.core/src/test/java/org/springframework/core/type/classreading/ClassMetadataReadingVisitorMemberClassTests.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2002-2011 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
+ *
+ *      http://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.core.type.classreading;
+
+import java.io.IOException;
+
+import org.springframework.core.type.AbstractClassMetadataMemberClassTests;
+import org.springframework.core.type.ClassMetadata;
+
+/**
+ * @author Chris Beams
+ * @since 3.1
+ * @see AbstractClassMetadataMemberClassTests
+ */
+public class ClassMetadataReadingVisitorMemberClassTests
+		extends AbstractClassMetadataMemberClassTests {
+
+	@Override
+	public ClassMetadata getClassMetadataFor(Class<?> clazz) {
+		try {
+			MetadataReader reader =
+				new SimpleMetadataReaderFactory().getMetadataReader(clazz.getName());
+			return reader.getAnnotationMetadata();
+		} catch (IOException ex) {
+			throw new IllegalStateException(ex);
+		}
+	}
+
+}