/*
* Copyright 2002-2014 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.
* 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.orm.jpa.persistenceunit;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.net.URL;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.Embeddable;
import javax.persistence.Entity;
import javax.persistence.MappedSuperclass;
import javax.persistence.PersistenceException;
import javax.persistence.SharedCacheMode;
import javax.persistence.ValidationMode;
import javax.persistence.spi.PersistenceUnitInfo;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.context.weaving.LoadTimeWeaverAware;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternUtils;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.core.type.filter.TypeFilter;
import org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver;
import org.springframework.instrument.classloading.LoadTimeWeaver;
import org.springframework.jdbc.datasource.lookup.DataSourceLookup;
import org.springframework.jdbc.datasource.lookup.JndiDataSourceLookup;
import org.springframework.jdbc.datasource.lookup.MapDataSourceLookup;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.ResourceUtils;
/**
* Default implementation of the {@link PersistenceUnitManager} interface.
* Used as internal default by
* {@link org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean}.
*
* <p>Supports standard JPA scanning for {@code persistence.xml} files,
* with configurable file locations, JDBC DataSource lookup and load-time weaving.
*
* <p>The default XML file location is {@code classpath*:META-INF/persistence.xml},
* scanning for all matching files in the classpath (as defined in the JPA specification).
* DataSource names are by default interpreted as JNDI names, and no load time weaving
* is available (which requires weaving to be turned off in the persistence provider).
*
* <p><b>NOTE: Spring's JPA support requires JPA 2.0 or higher, as of Spring 4.0.</b>
* Spring's persistence unit bootstrapping automatically detects JPA 2.1 at runtime.
*
* @author Juergen Hoeller
* @since 2.0
* @see #setPersistenceXmlLocations
* @see #setDataSourceLookup
* @see #setLoadTimeWeaver
* @see org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean#setPersistenceUnitManager
*/
public class DefaultPersistenceUnitManager
implements PersistenceUnitManager, ResourceLoaderAware, LoadTimeWeaverAware, InitializingBean {
private static final String CLASS_RESOURCE_PATTERN = "/**/*.class";
private static final String PACKAGE_INFO_SUFFIX = ".package-info";
private static final String DEFAULT_ORM_XML_RESOURCE = "META-INF/orm.xml";
private static final String PERSISTENCE_XML_FILENAME = "persistence.xml";
/**
* Default location of the {@code persistence.xml} file:
* "classpath*:META-INF/persistence.xml".
*/
public final static String DEFAULT_PERSISTENCE_XML_LOCATION = "classpath*:META-INF/" + PERSISTENCE_XML_FILENAME;
/**
* Default location for the persistence unit root URL:
* "classpath:", indicating the root of the classpath.
*/
public final static String ORIGINAL_DEFAULT_PERSISTENCE_UNIT_ROOT_LOCATION = "classpath:";
public final static String ORIGINAL_DEFAULT_PERSISTENCE_UNIT_NAME = "default";
private static final Set<TypeFilter> entityTypeFilters;
static {
entityTypeFilters = new LinkedHashSet<TypeFilter>(4);
entityTypeFilters.add(new AnnotationTypeFilter(Entity.class, false));
entityTypeFilters.add(new AnnotationTypeFilter(Embeddable.class, false));
entityTypeFilters.add(new AnnotationTypeFilter(MappedSuperclass.class, false));
try {
@SuppressWarnings("unchecked")
Class<? extends Annotation> converterAnnotation = (Class<? extends Annotation>)
ClassUtils.forName("javax.persistence.Converter", DefaultPersistenceUnitManager.class.getClassLoader());
entityTypeFilters.add(new AnnotationTypeFilter(converterAnnotation, false));
}
catch (ClassNotFoundException ex) {
// JPA 2.1 API not available
}
}
protected final Log logger = LogFactory.getLog(getClass());
private String[] persistenceXmlLocations = new String[] {DEFAULT_PERSISTENCE_XML_LOCATION};
private String defaultPersistenceUnitRootLocation = ORIGINAL_DEFAULT_PERSISTENCE_UNIT_ROOT_LOCATION;
private String defaultPersistenceUnitName = ORIGINAL_DEFAULT_PERSISTENCE_UNIT_NAME;
private String[] packagesToScan;
private String[] mappingResources;
private SharedCacheMode sharedCacheMode;
private ValidationMode validationMode;
private DataSourceLookup dataSourceLookup = new JndiDataSourceLookup();
private DataSource defaultDataSource;
private DataSource defaultJtaDataSource;
private PersistenceUnitPostProcessor[] persistenceUnitPostProcessors;
private LoadTimeWeaver loadTimeWeaver;
private ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
private final Set<String> persistenceUnitInfoNames = new HashSet<String>();
private final Map<String, PersistenceUnitInfo> persistenceUnitInfos = new HashMap<String, PersistenceUnitInfo>();
/**
* Specify the location of the {@code persistence.xml} files to load.
* These can be specified as Spring resource locations and/or location patterns.
* <p>Default is "classpath*:META-INF/persistence.xml".
*/
public void setPersistenceXmlLocation(String persistenceXmlLocation) {
this.persistenceXmlLocations = new String[] {persistenceXmlLocation};
}
/**
* Specify multiple locations of {@code persistence.xml} files to load.
* These can be specified as Spring resource locations and/or location patterns.
* <p>Default is "classpath*:META-INF/persistence.xml".
* @param persistenceXmlLocations an array of Spring resource Strings
* identifying the location of the {@code persistence.xml} files to read
*/
public void setPersistenceXmlLocations(String... persistenceXmlLocations) {
this.persistenceXmlLocations = persistenceXmlLocations;
}
/**
* Set the default persistence unit root location, to be applied
* if no unit-specific persistence unit root could be determined.
* <p>Default is "classpath:", that is, the root of the current classpath
* (nearest root directory). To be overridden if unit-specific resolution
* does not work and the classpath root is not appropriate either.
*/
public void setDefaultPersistenceUnitRootLocation(String defaultPersistenceUnitRootLocation) {
this.defaultPersistenceUnitRootLocation = defaultPersistenceUnitRootLocation;
}
/**
* Specify the name of the default persistence unit, if any. Default is "default".
* <p>Primarily applied to a scanned persistence unit without {@code persistence.xml}.
* Also applicable to selecting a default unit from several persistence units available.
* @see #setPackagesToScan
* @see #obtainDefaultPersistenceUnitInfo
*/
public void setDefaultPersistenceUnitName(String defaultPersistenceUnitName) {
this.defaultPersistenceUnitName = defaultPersistenceUnitName;
}
/**
* Set whether to use Spring-based scanning for entity classes in the classpath
* instead of using JPA's standard scanning of jar files with {@code persistence.xml}
* markers in them. In case of Spring-based scanning, no {@code persistence.xml}
* is necessary; all you need to do is to specify base packages to search here.
* <p>Default is none. Specify packages to search for autodetection of your entity
* classes in the classpath. This is analogous to Spring's component-scan feature
* ({@link org.springframework.context.annotation.ClassPathBeanDefinitionScanner}).
* <p>Such package scanning defines a "default persistence unit" in Spring, which
* may live next to regularly defined units originating from {@code persistence.xml}.
* Its name is determined by {@link #setDefaultPersistenceUnitName}: by default,
* it's simply "default".
* <p><p>Note: There may be limitations in comparison to regular JPA scanning.</b>
* In particular, JPA providers may pick up annotated packages for provider-specific
* annotations only when driven by {@code persistence.xml}. As of 4.1, Spring's
* scan can detect annotated packages as well if supported by the given
* {@link org.springframework.orm.jpa.JpaVendorAdapter} (e.g. for Hibernate).
* <p>If no explicit {@link #setMappingResources mapping resources} have been
* specified in addition to these packages, this manager looks for a default
* {@code META-INF/orm.xml} file in the classpath, registering it as a mapping
* resource for the default unit if the mapping file is not co-located with a
* {@code persistence.xml} file (in which case we assume it is only meant to be
* used with the persistence units defined there, like in standard JPA).
* @see #setDefaultPersistenceUnitName
* @see #setMappingResources
*/
public void setPackagesToScan(String... packagesToScan) {
this.packagesToScan = packagesToScan;
}
/**
* Specify one or more mapping resources (equivalent to {@code <mapping-file>}
* entries in {@code persistence.xml}) for the default persistence unit.
* Can be used on its own or in combination with entity scanning in the classpath,
* in both cases avoiding {@code persistence.xml}.
* <p>Note that mapping resources must be relative to the classpath root,
* e.g. "META-INF/mappings.xml" or "com/mycompany/repository/mappings.xml",
* so that they can be loaded through {@code ClassLoader.getResource}.
* <p>If no explicit mapping resources have been specified next to
* {@link #setPackagesToScan packages to scan}, this manager looks for a default
* {@code META-INF/orm.xml} file in the classpath, registering it as a mapping
* resource for the default unit if the mapping file is not co-located with a
* {@code persistence.xml} file (in which case we assume it is only meant to be
* used with the persistence units defined there, like in standard JPA).
* <p>Note that specifying an empty array/list here suppresses the default
* {@code META-INF/orm.xml} check. On the other hand, explicitly specifying
* {@code META-INF/orm.xml} here will register that file even if it happens
* to be co-located with a {@code persistence.xml} file.
* @see #setDefaultPersistenceUnitName
* @see #setPackagesToScan
*/
public void setMappingResources(String... mappingResources) {
this.mappingResources = mappingResources;
}
/**
* Specify the JPA 2.0 shared cache mode for all of this manager's persistence
* units, overriding any value in {@code persistence.xml} if set.
* @see javax.persistence.spi.PersistenceUnitInfo#getSharedCacheMode()
*/
public void setSharedCacheMode(SharedCacheMode sharedCacheMode) {
this.sharedCacheMode = sharedCacheMode;
}
/**
* Specify the JPA 2.0 validation mode for all of this manager's persistence
* units, overriding any value in {@code persistence.xml} if set.
* @see javax.persistence.spi.PersistenceUnitInfo#getValidationMode()
*/
public void setValidationMode(ValidationMode validationMode) {
this.validationMode = validationMode;
}
/**
* Specify the JDBC DataSources that the JPA persistence provider is supposed
* to use for accessing the database, resolving data source names in
* {@code persistence.xml} against Spring-managed DataSources.
* <p>The specified Map needs to define data source names for specific DataSource
* objects, matching the data source names used in {@code persistence.xml}.
* If not specified, data source names will be resolved as JNDI names instead
* (as defined by standard JPA).
* @see org.springframework.jdbc.datasource.lookup.MapDataSourceLookup
*/
public void setDataSources(Map<String, DataSource> dataSources) {
this.dataSourceLookup = new MapDataSourceLookup(dataSources);
}
/**
* Specify the JDBC DataSourceLookup that provides DataSources for the
* persistence provider, resolving data source names in {@code persistence.xml}
* against Spring-managed DataSource instances.
* <p>Default is JndiDataSourceLookup, which resolves DataSource names as
* JNDI names (as defined by standard JPA). Specify a BeanFactoryDataSourceLookup
* instance if you want DataSource names to be resolved against Spring bean names.
* <p>Alternatively, consider passing in a map from names to DataSource instances
* via the "dataSources" property. If the {@code persistence.xml} file
* does not define DataSource names at all, specify a default DataSource
* via the "defaultDataSource" property.
* @see org.springframework.jdbc.datasource.lookup.JndiDataSourceLookup
* @see org.springframework.jdbc.datasource.lookup.BeanFactoryDataSourceLookup
* @see #setDataSources
* @see #setDefaultDataSource
*/
public void setDataSourceLookup(DataSourceLookup dataSourceLookup) {
this.dataSourceLookup = (dataSourceLookup != null ? dataSourceLookup : new JndiDataSourceLookup());
}
/**
* Return the JDBC DataSourceLookup that provides DataSources for the
* persistence provider, resolving data source names in {@code persistence.xml}
* against Spring-managed DataSource instances.
*/
public DataSourceLookup getDataSourceLookup() {
return this.dataSourceLookup;
}
/**
* Specify the JDBC DataSource that the JPA persistence provider is supposed to use
* for accessing the database if none has been specified in {@code persistence.xml}.
* This variant indicates no special transaction setup, i.e. typical resource-local.
* <p>In JPA speak, a DataSource passed in here will be uses as "nonJtaDataSource"
* on the PersistenceUnitInfo passed to the PersistenceProvider, provided that
* none has been registered before.
* @see javax.persistence.spi.PersistenceUnitInfo#getNonJtaDataSource()
*/
public void setDefaultDataSource(DataSource defaultDataSource) {
this.defaultDataSource = defaultDataSource;
}
/**
* Return the JDBC DataSource that the JPA persistence provider is supposed to use
* for accessing the database if none has been specified in {@code persistence.xml}.
*/
public DataSource getDefaultDataSource() {
return this.defaultDataSource;
}
/**
* Specify the JDBC DataSource that the JPA persistence provider is supposed to use
* for accessing the database if none has been specified in {@code persistence.xml}.
* This variant indicates that JTA is supposed to be used as transaction type.
* <p>In JPA speak, a DataSource passed in here will be uses as "jtaDataSource"
* on the PersistenceUnitInfo passed to the PersistenceProvider, provided that
* none has been registered before.
* @see javax.persistence.spi.PersistenceUnitInfo#getJtaDataSource()
*/
public void setDefaultJtaDataSource(DataSource defaultJtaDataSource) {
this.defaultJtaDataSource = defaultJtaDataSource;
}
/**
* Return the JTA-aware DataSource that the JPA persistence provider is supposed to use
* for accessing the database if none has been specified in {@code persistence.xml}.
*/
public DataSource getDefaultJtaDataSource() {
return this.defaultJtaDataSource;
}
/**
* Set the PersistenceUnitPostProcessors to be applied to each
* PersistenceUnitInfo that has been parsed by this manager.
* <p>Such post-processors can, for example, register further entity classes and
* jar files, in addition to the metadata read from {@code persistence.xml}.
*/
public void setPersistenceUnitPostProcessors(PersistenceUnitPostProcessor... postProcessors) {
this.persistenceUnitPostProcessors = postProcessors;
}
/**
* Return the PersistenceUnitPostProcessors to be applied to each
* PersistenceUnitInfo that has been parsed by this manager.
*/
public PersistenceUnitPostProcessor[] getPersistenceUnitPostProcessors() {
return this.persistenceUnitPostProcessors;
}
/**
* Specify the Spring LoadTimeWeaver to use for class instrumentation according
* to the JPA class transformer contract.
* <p>It is not required to specify a LoadTimeWeaver: Most providers will be able
* to provide a subset of their functionality without class instrumentation as well,
* or operate with their own VM agent specified on JVM startup. Furthermore,
* DefaultPersistenceUnitManager falls back to an InstrumentationLoadTimeWeaver
* if Spring's agent-based instrumentation is available at runtime.
* <p>In terms of Spring-provided weaving options, the most important ones are
* InstrumentationLoadTimeWeaver, which requires a Spring-specific (but very general)
* VM agent specified on JVM startup, and ReflectiveLoadTimeWeaver, which interacts
* with an underlying ClassLoader based on specific extended methods being available
* on it (for example, interacting with Spring's TomcatInstrumentableClassLoader).
* Consider using the {@code context:load-time-weaver} XML tag for creating
* such a shared LoadTimeWeaver (autodetecting the environment by default).
* @see org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver
* @see org.springframework.instrument.classloading.ReflectiveLoadTimeWeaver
*/
@Override
public void setLoadTimeWeaver(LoadTimeWeaver loadTimeWeaver) {
this.loadTimeWeaver = loadTimeWeaver;
}
/**
* Return the Spring LoadTimeWeaver to use for class instrumentation according
* to the JPA class transformer contract.
*/
public LoadTimeWeaver getLoadTimeWeaver() {
return this.loadTimeWeaver;
}
@Override
public void setResourceLoader(ResourceLoader resourceLoader) {
this.resourcePatternResolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
}
@Override
public void afterPropertiesSet() {
if (this.loadTimeWeaver == null && InstrumentationLoadTimeWeaver.isInstrumentationAvailable()) {
this.loadTimeWeaver = new InstrumentationLoadTimeWeaver(this.resourcePatternResolver.getClassLoader());
}
preparePersistenceUnitInfos();
}
/**
* Prepare the PersistenceUnitInfos according to the configuration
* of this manager: scanning for {@code persistence.xml} files,
* parsing all matching files, configuring and post-processing them.
* <p>PersistenceUnitInfos cannot be obtained before this preparation
* method has been invoked.
* @see #obtainDefaultPersistenceUnitInfo()
* @see #obtainPersistenceUnitInfo(String)
*/
public void preparePersistenceUnitInfos() {
this.persistenceUnitInfoNames.clear();
this.persistenceUnitInfos.clear();
List<SpringPersistenceUnitInfo> puis = readPersistenceUnitInfos();
for (SpringPersistenceUnitInfo pui : puis) {
if (pui.getPersistenceUnitRootUrl() == null) {
pui.setPersistenceUnitRootUrl(determineDefaultPersistenceUnitRootUrl());
}
if (pui.getJtaDataSource() == null) {
pui.setJtaDataSource(this.defaultJtaDataSource);
}
if (pui.getNonJtaDataSource() == null) {
pui.setNonJtaDataSource(this.defaultDataSource);
}
if (this.sharedCacheMode != null) {
pui.setSharedCacheMode(this.sharedCacheMode);
}
if (this.validationMode != null) {
pui.setValidationMode(this.validationMode);
}
if (this.loadTimeWeaver != null) {
pui.init(this.loadTimeWeaver);
}
else {
pui.init(this.resourcePatternResolver.getClassLoader());
}
postProcessPersistenceUnitInfo(pui);
String name = pui.getPersistenceUnitName();
if (!this.persistenceUnitInfoNames.add(name) && !isPersistenceUnitOverrideAllowed()) {
StringBuilder msg = new StringBuilder();
msg.append("Conflicting persistence unit definitions for name '").append(name).append("': ");
msg.append(pui.getPersistenceUnitRootUrl()).append(", ");
msg.append(this.persistenceUnitInfos.get(name).getPersistenceUnitRootUrl());
throw new IllegalStateException(msg.toString());
}
this.persistenceUnitInfos.put(name, pui);
}
}
/**
* Read all persistence unit infos from {@code persistence.xml},
* as defined in the JPA specification.
*/
private List<SpringPersistenceUnitInfo> readPersistenceUnitInfos() {
List<SpringPersistenceUnitInfo> infos = new LinkedList<SpringPersistenceUnitInfo>();
String defaultName = this.defaultPersistenceUnitName;
boolean buildDefaultUnit = (this.packagesToScan != null || this.mappingResources != null);
boolean foundDefaultUnit = false;
PersistenceUnitReader reader = new PersistenceUnitReader(this.resourcePatternResolver, this.dataSourceLookup);
SpringPersistenceUnitInfo[] readInfos = reader.readPersistenceUnitInfos(this.persistenceXmlLocations);
for (SpringPersistenceUnitInfo readInfo : readInfos) {
infos.add(readInfo);
if (defaultName != null && defaultName.equals(readInfo.getPersistenceUnitName())) {
foundDefaultUnit = true;
}
}
if (buildDefaultUnit) {
if (foundDefaultUnit) {
if (logger.isInfoEnabled()) {
logger.info("Found explicit default unit with name '" + defaultName + "' in persistence.xml - " +
"overriding local default unit settings ('packagesToScan'/'mappingResources')");
}
}
else {
infos.add(buildDefaultPersistenceUnitInfo());
}
}
return infos;
}
/**
* Perform Spring-based scanning for entity classes.
* @see #setPackagesToScan
*/
private SpringPersistenceUnitInfo buildDefaultPersistenceUnitInfo() {
SpringPersistenceUnitInfo scannedUnit = new SpringPersistenceUnitInfo();
scannedUnit.setPersistenceUnitName(this.defaultPersistenceUnitName);
scannedUnit.setExcludeUnlistedClasses(true);
if (this.packagesToScan != null) {
for (String pkg : this.packagesToScan) {
try {
String pattern = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +
ClassUtils.convertClassNameToResourcePath(pkg) + CLASS_RESOURCE_PATTERN;
Resource[] resources = this.resourcePatternResolver.getResources(pattern);
MetadataReaderFactory readerFactory = new CachingMetadataReaderFactory(this.resourcePatternResolver);
for (Resource resource : resources) {
if (resource.isReadable()) {
MetadataReader reader = readerFactory.getMetadataReader(resource);
String className = reader.getClassMetadata().getClassName();
if (matchesFilter(reader, readerFactory)) {
scannedUnit.addManagedClassName(className);
if (scannedUnit.getPersistenceUnitRootUrl() == null) {
URL url = resource.getURL();
if (ResourceUtils.isJarURL(url)) {
scannedUnit.setPersistenceUnitRootUrl(ResourceUtils.extractJarFileURL(url));
}
}
}
else if (className.endsWith(PACKAGE_INFO_SUFFIX)) {
scannedUnit.addManagedPackage(
className.substring(0, className.length() - PACKAGE_INFO_SUFFIX.length()));
}
}
}
}
catch (IOException ex) {
throw new PersistenceException("Failed to scan classpath for unlisted entity classes", ex);
}
}
}
if (this.mappingResources != null) {
for (String mappingFileName : this.mappingResources) {
scannedUnit.addMappingFileName(mappingFileName);
}
}
else if (useOrmXmlForDefaultPersistenceUnit()) {
scannedUnit.addMappingFileName(DEFAULT_ORM_XML_RESOURCE);
}
return scannedUnit;
}
/**
* Check whether any of the configured entity type filters matches
* the current class descriptor contained in the metadata reader.
*/
private boolean matchesFilter(MetadataReader reader, MetadataReaderFactory readerFactory) throws IOException {
for (TypeFilter filter : entityTypeFilters) {
if (filter.match(reader, readerFactory)) {
return true;
}
}
return false;
}
/**
* Try to determine the persistence unit root URL based on the given
* "defaultPersistenceUnitRootLocation".
* @return the persistence unit root URL to pass to the JPA PersistenceProvider
* @see #setDefaultPersistenceUnitRootLocation
*/
private URL determineDefaultPersistenceUnitRootUrl() {
if (this.defaultPersistenceUnitRootLocation == null) {
return null;
}
try {
Resource res = this.resourcePatternResolver.getResource(this.defaultPersistenceUnitRootLocation);
return res.getURL();
}
catch (IOException ex) {
throw new PersistenceException("Unable to resolve persistence unit root URL", ex);
}
}
/**
* Determine whether to register JPA's default "META-INF/orm.xml" with
* Spring's default persistence unit, if any.
* <p>Checks whether a "META-INF/orm.xml" file exists in the classpath and
* uses it if it is not co-located with a "META-INF/persistence.xml" file.
*/
private boolean useOrmXmlForDefaultPersistenceUnit() {
Resource ormXml = this.resourcePatternResolver.getResource(
this.defaultPersistenceUnitRootLocation + DEFAULT_ORM_XML_RESOURCE);
if (ormXml.exists()) {
try {
Resource persistenceXml = ormXml.createRelative(PERSISTENCE_XML_FILENAME);
if (!persistenceXml.exists()) {
return true;
}
}
catch (IOException ex) {
// Cannot resolve relative persistence.xml file - let's assume it's not there.
return true;
}
}
return false;
}
/**
* Return the specified PersistenceUnitInfo from this manager's cache
* of processed persistence units, keeping it in the cache (i.e. not
* 'obtaining' it for use but rather just accessing it for post-processing).
* <p>This can be used in {@link #postProcessPersistenceUnitInfo} implementations,
* detecting existing persistence units of the same name and potentially merging them.
* @param persistenceUnitName the name of the desired persistence unit
* @return the PersistenceUnitInfo in mutable form, or {@code null} if not available
*/
protected final MutablePersistenceUnitInfo getPersistenceUnitInfo(String persistenceUnitName) {
PersistenceUnitInfo pui = this.persistenceUnitInfos.get(persistenceUnitName);
return (MutablePersistenceUnitInfo) pui;
}
/**
* Hook method allowing subclasses to customize each PersistenceUnitInfo.
* <p>The default implementation delegates to all registered PersistenceUnitPostProcessors.
* It is usually preferable to register further entity classes, jar files etc there
* rather than in a subclass of this manager, to be able to reuse the post-processors.
* @param pui the chosen PersistenceUnitInfo, as read from {@code persistence.xml}.
* Passed in as MutablePersistenceUnitInfo.
* @see #setPersistenceUnitPostProcessors
*/
protected void postProcessPersistenceUnitInfo(MutablePersistenceUnitInfo pui) {
PersistenceUnitPostProcessor[] postProcessors = getPersistenceUnitPostProcessors();
if (postProcessors != null) {
for (PersistenceUnitPostProcessor postProcessor : postProcessors) {
postProcessor.postProcessPersistenceUnitInfo(pui);
}
}
}
/**
* Return whether an override of a same-named persistence unit is allowed.
* <p>Default is {@code false}. May be overridden to return {@code true},
* for example if {@link #postProcessPersistenceUnitInfo} is able to handle that case.
*/
protected boolean isPersistenceUnitOverrideAllowed() {
return false;
}
@Override
public PersistenceUnitInfo obtainDefaultPersistenceUnitInfo() {
if (this.persistenceUnitInfoNames.isEmpty()) {
throw new IllegalStateException("No persistence units parsed from " +
ObjectUtils.nullSafeToString(this.persistenceXmlLocations));
}
if (this.persistenceUnitInfos.isEmpty()) {
throw new IllegalStateException("All persistence units from " +
ObjectUtils.nullSafeToString(this.persistenceXmlLocations) + " already obtained");
}
if (this.persistenceUnitInfos.size() > 1) {
return obtainPersistenceUnitInfo(this.defaultPersistenceUnitName);
}
PersistenceUnitInfo pui = this.persistenceUnitInfos.values().iterator().next();
this.persistenceUnitInfos.clear();
return pui;
}
@Override
public PersistenceUnitInfo obtainPersistenceUnitInfo(String persistenceUnitName) {
PersistenceUnitInfo pui = this.persistenceUnitInfos.remove(persistenceUnitName);
if (pui == null) {
if (!this.persistenceUnitInfoNames.contains(persistenceUnitName)) {
throw new IllegalArgumentException(
"No persistence unit with name '" + persistenceUnitName + "' found");
}
else {
throw new IllegalStateException(
"Persistence unit with name '" + persistenceUnitName + "' already obtained");
}
}
return pui;
}
}