statelesssessionimpl.java

hibernate-3.1.3-all-src.zip 面向对象的访问数据库工具

	}
	
	private PersistenceContext temporaryPersistenceContext = new StatefulPersistenceContext(this);
	
	public Object get(Class entityClass, Serializable id) {
		return get( entityClass.getName(), id );
	}
	
	public Object get(Class entityClass, Serializable id, LockMode lockMode) {
		return get( entityClass.getName(), id, lockMode );
	}
	
	public Object get(String entityName, Serializable id) {
		return get(entityName, id, LockMode.NONE);
	}

	public Object get(String entityName, Serializable id, LockMode lockMode) {
		errorIfClosed();
		Object result = getFactory().getEntityPersister(entityName)
				.load(id, null, lockMode, this);
		temporaryPersistenceContext.clear();
		return result;
	}

	public String guessEntityName(Object entity) throws HibernateException {
		errorIfClosed();
		return entity.getClass().getName();
	}

	public Object immediateLoad(String entityName, Serializable id) throws HibernateException {
		throw new SessionException("proxies cannot be fetched by a stateless session");
	}

	public void initializeCollection(PersistentCollection collection, boolean writing) 
	throws HibernateException {
		throw new SessionException("collections cannot be fetched by a stateless session");
	}

	public Object instantiate(String entityName, Serializable id) throws HibernateException {
		errorIfClosed();
		return getFactory().getEntityPersister(entityName).instantiate(id, EntityMode.POJO);
	}

	public Object internalLoad(String entityName, Serializable id, boolean eager, boolean nullable) 
	throws HibernateException {
		errorIfClosed();
		EntityPersister persister = getFactory().getEntityPersister(entityName);
		if ( !eager && persister.hasProxy() ) {
			return persister.createProxy(id, this);
		}
		Object loaded = temporaryPersistenceContext.getEntity( new EntityKey(id, persister, EntityMode.POJO) );
		//TODO: if not loaded, throw an exception
		return loaded==null ? get(entityName, id) : loaded;
	}

	public boolean isConnected() {
		return jdbcContext.getConnectionManager().isCurrentlyConnected();
	}

	public boolean isTransactionInProgress() {
		return jdbcContext.isTransactionInProgress();
	}

	public Iterator iterate(String query, QueryParameters queryParameters) throws HibernateException {
		throw new UnsupportedOperationException();
	}

	public Iterator iterateFilter(Object collection, String filter, QueryParameters queryParameters) 
	throws HibernateException {
		throw new UnsupportedOperationException();
	}

	public List listFilter(Object collection, String filter, QueryParameters queryParameters) 
	throws HibernateException {
		throw new UnsupportedOperationException();
	}

	public void setAutoClear(boolean enabled) {
		throw new UnsupportedOperationException();
	}

	public void setCacheMode(CacheMode cm) {
		throw new UnsupportedOperationException();
	}

	public void setFlushMode(FlushMode fm) {
		throw new UnsupportedOperationException();
	}
	
	public Transaction getTransaction() throws HibernateException {
		errorIfClosed();
		return jdbcContext.getTransaction();
	}
	
	public Transaction beginTransaction() throws HibernateException {
		errorIfClosed();
		Transaction result = getTransaction();
		result.begin();
		return result;
	}
	
	public boolean isEventSource() {
		return false;
	}
	
/////////////////////////////////////////////////////////////////////////////////////////////////////
	
	//TODO: COPY/PASTE FROM SessionImpl, pull up!

	public List list(String query, QueryParameters queryParameters) throws HibernateException {
		errorIfClosed();
		queryParameters.validateParameters();
		HQLQueryPlan plan = getHQLQueryPlan( query, false );
		boolean success = false;
		List results = CollectionHelper.EMPTY_LIST;
		try {
			results = plan.performList( queryParameters, this );
			success = true;
		}
		finally {
			afterOperation(success);
		}
		temporaryPersistenceContext.clear();
		return results;
	}

	public void afterOperation(boolean success) {
		if ( !jdbcContext.isTransactionInProgress() ) {
			jdbcContext.afterNontransactionalQuery(success);
		}
	}

	public Criteria createCriteria(Class persistentClass, String alias) {
		errorIfClosed();
		return new CriteriaImpl( persistentClass.getName(), alias, this );
	}

	public Criteria createCriteria(String entityName, String alias) {
		errorIfClosed();
		return new CriteriaImpl(entityName, alias, this);
	}

	public Criteria createCriteria(Class persistentClass) {
		errorIfClosed();
		return new CriteriaImpl( persistentClass.getName(), this );
	}

	public Criteria createCriteria(String entityName) {
		errorIfClosed();
		return new CriteriaImpl(entityName, this);
	}

	public ScrollableResults scroll(CriteriaImpl criteria, ScrollMode scrollMode) {
		errorIfClosed();
		String entityName = criteria.getEntityOrClassName();
		CriteriaLoader loader = new CriteriaLoader(
				getOuterJoinLoadable(entityName),
				factory,
				criteria,
				entityName,
		        getEnabledFilters()
			);
		return loader.scroll(this, scrollMode);
	}

	public List list(CriteriaImpl criteria) throws HibernateException {
		errorIfClosed();
		String[] implementors = factory.getImplementors( criteria.getEntityOrClassName() );
		int size = implementors.length;

		CriteriaLoader[] loaders = new CriteriaLoader[size];
		Set spaces = new HashSet();
		for( int i=0; i <size; i++ ) {

			loaders[i] = new CriteriaLoader(
					getOuterJoinLoadable( implementors[i] ),
					factory,
					criteria,
					implementors[i],
			        getEnabledFilters()
			);

			spaces.addAll( loaders[i].getQuerySpaces() );

		}


		List results = Collections.EMPTY_LIST;
		boolean success = false;
		try {
			for( int i=0; i<size; i++ ) {
				final List currentResults = loaders[i].list(this);
				currentResults.addAll(results);
				results = currentResults;
			}
			success = true;
		}
		finally {
			afterOperation(success);
		}
		temporaryPersistenceContext.clear();
		return results;
	}

	private OuterJoinLoadable getOuterJoinLoadable(String entityName) throws MappingException {
		EntityPersister persister = factory.getEntityPersister(entityName);
		if ( !(persister instanceof OuterJoinLoadable) ) {
			throw new MappingException( "class persister is not OuterJoinLoadable: " + entityName );
		}
		return ( OuterJoinLoadable ) persister;
	}

	public List listCustomQuery(CustomQuery customQuery, QueryParameters queryParameters) 
	throws HibernateException {
		errorIfClosed();
		CustomLoader loader = new CustomLoader( customQuery, getFactory() );

		boolean success = false;
		List results;
		try {
			results = loader.list(this, queryParameters);
			success = true;
		}
		finally {
			afterOperation(success);
		}
		temporaryPersistenceContext.clear();
		return results;
	}

	public ScrollableResults scrollCustomQuery(CustomQuery customQuery, QueryParameters queryParameters) 
	throws HibernateException {
		errorIfClosed();
		CustomLoader loader = new CustomLoader( customQuery, getFactory() );
		return loader.scroll(queryParameters, this);
	}

	public ScrollableResults scroll(String query, QueryParameters queryParameters) throws HibernateException {
		errorIfClosed();
		HQLQueryPlan plan = getHQLQueryPlan( query, false );
		return plan.performScroll( queryParameters, this );
	}

	public void afterScrollOperation() {
		temporaryPersistenceContext.clear();
	}

	public void flush() {}

	public String getFetchProfile() {
		return null;
	}

	public JDBCContext getJDBCContext() {
		return jdbcContext;
	}

	public void setFetchProfile(String name) {}

	public void afterTransactionBegin(Transaction tx) {}

	protected boolean autoFlushIfRequired(Set querySpaces) throws HibernateException {
		// no auto-flushing to support in stateless session
		return false;
	}
}