DATAJPA-123 - Added classpath-scanning PersistenceUnitPostProcessor.

Added ClasspathScanningPersistenceUnitPostProcessor that will scan the configured base package for classes annotated with @Entity or @MappedSuperclass and add them to the PersistenceUnit handled.

Beyond that it will scan for JPA XML mapping files if an optional mapping file name pattern is configured on the PUPP instance.

src/test/java/org/springframework/data/jpa/support/ClasspathScanningPersistenceUnitPostProcessorUnitTests.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright 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.data.jpa.support;
+
+import static org.mockito.Mockito.*;
+
+import javax.persistence.Entity;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.orm.jpa.persistenceunit.MutablePersistenceUnitInfo;
+import org.springframework.orm.jpa.persistenceunit.PersistenceUnitPostProcessor;
+
+/**
+ * Unit tests for {@link ClasspathScanningPersistenceUnitPostProcessor}.
+ * 
+ * @author Oliver Gierke
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class ClasspathScanningPersistenceUnitPostProcessorUnitTests {
+
+	@Mock
+	MutablePersistenceUnitInfo pui;
+	String basePackage = getClass().getPackage().getName();
+
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsNullBasePackage() {
+		new ClasspathScanningPersistenceUnitPostProcessor(null);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsEmptyBasePackage() {
+		new ClasspathScanningPersistenceUnitPostProcessor("");
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsNullMappingFileNamePattern() {
+		ClasspathScanningPersistenceUnitPostProcessor processor = new ClasspathScanningPersistenceUnitPostProcessor(
+				basePackage);
+		processor.setMappingFileNamePattern(null);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void rejectsEmptyMappingFileNamePattern() {
+		ClasspathScanningPersistenceUnitPostProcessor processor = new ClasspathScanningPersistenceUnitPostProcessor(
+				basePackage);
+		processor.setMappingFileNamePattern("");
+	}
+
+	@Test
+	public void findsEntityClassesForBasePackage() {
+
+		PersistenceUnitPostProcessor processor = new ClasspathScanningPersistenceUnitPostProcessor(basePackage);
+		processor.postProcessPersistenceUnitInfo(pui);
+
+		verify(pui).addManagedClassName(SampleEntity.class.getName());
+	}
+
+	@Test
+	public void findsMappingFile() {
+
+		DefaultResourceLoader loader = new DefaultResourceLoader();
+		String expected = getClass().getResource("mapping.xml").toString();
+
+		ClasspathScanningPersistenceUnitPostProcessor processor = new ClasspathScanningPersistenceUnitPostProcessor(
+				basePackage);
+		processor.setMappingFileNamePattern("*.xml");
+		processor.setResourceLoader(loader);
+		processor.postProcessPersistenceUnitInfo(pui);
+
+		verify(pui).addManagedClassName(SampleEntity.class.getName());
+		verify(pui).addMappingFileName(expected);
+	}
+
+	@Entity
+	public static class SampleEntity {
+
+	}
+}