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Spring Framework example source code file (TopLinkTemplate.java)

This example Spring Framework source code file (TopLinkTemplate.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

class, dataaccessexception, dataaccessexception, list, list, object, object, objectcopyingpolicy, sessionreadcallback, string, toplinkexception, toplinkexception, toplinktemplate, unitofworkcallback, util

The Spring Framework TopLinkTemplate.java source code

/*
 * Copyright 2002-2007 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.toplink;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

import oracle.toplink.exceptions.TopLinkException;
import oracle.toplink.expressions.Expression;
import oracle.toplink.queryframework.Call;
import oracle.toplink.queryframework.DatabaseQuery;
import oracle.toplink.queryframework.ReadObjectQuery;
import oracle.toplink.sessions.ObjectCopyingPolicy;
import oracle.toplink.sessions.Session;
import oracle.toplink.sessions.UnitOfWork;

import org.springframework.dao.DataAccessException;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * Helper class that simplifies TopLink data access code, and converts
 * TopLinkExceptions into unchecked DataAccessExceptions, following the
 * <code>org.springframework.dao exception hierarchy.
 *
 * <p>The central method is execute, supporting TopLink access code
 * implementing the {@link TopLinkCallback} interface. It provides TopLink Session
 * handling such that neither the TopLinkCallback implementation nor the calling
 * code needs to explicitly care about retrieving/closing TopLink Sessions,
 * or handling Session lifecycle exceptions. For typical single step actions,
 * there are various convenience methods (read, readAll, merge, delete, etc).
 *
 * <p>Can be used within a service implementation via direct instantiation
 * with a SessionFactory reference, or get prepared in an application context
 * and given to services as bean reference. Note: The SessionFactory should
 * always be configured as bean in the application context, in the first case
 * given to the service directly, in the second case to the prepared template.
 *
 * <p>This class can be considered as direct alternative to working with the raw
 * TopLink Session API (through <code>SessionFactoryUtils.getSession()).
 * The major advantage is its automatic conversion to DataAccessExceptions, the
 * major disadvantage that no checked application exceptions can get thrown from
 * within data access code. Corresponding checks and the actual throwing of such
 * exceptions can often be deferred to after callback execution, though.
 *
 * <p>{@link LocalSessionFactoryBean} is the preferred way of obtaining a reference
 * to a specific TopLink SessionFactory. It will usually be configured to
 * create ClientSessions for a ServerSession held by it, allowing for seamless
 * multi-threaded execution. The Spring application context will manage its lifecycle,
 * initializing and shutting down the factory as part of the application.
 *
 * <p>Thanks to Slavik Markovich for implementing the initial TopLink support prototype!
 *
 * @author Juergen Hoeller
 * @author <a href="mailto:james.x.clark@oracle.com">James Clark
 * @since 1.2
 * @see #setSessionFactory
 * @see TopLinkCallback
 * @see oracle.toplink.sessions.Session
 * @see TopLinkInterceptor
 * @see LocalSessionFactoryBean
 * @see TopLinkTransactionManager
 * @see org.springframework.transaction.jta.JtaTransactionManager
 */
public class TopLinkTemplate extends TopLinkAccessor implements TopLinkOperations {

	private boolean allowCreate = true;


	/**
	 * Create a new TopLinkTemplate instance.
	 */
	public TopLinkTemplate() {
	}

	/**
	 * Create a new TopLinkTemplate instance.
	 */
	public TopLinkTemplate(SessionFactory sessionFactory) {
		setSessionFactory(sessionFactory);
		afterPropertiesSet();
	}

	/**
	 * Create a new TopLinkTemplate instance.
	 * @param allowCreate if a new Session should be created if no thread-bound found
	 */
	public TopLinkTemplate(SessionFactory sessionFactory, boolean allowCreate) {
		setSessionFactory(sessionFactory);
		setAllowCreate(allowCreate);
		afterPropertiesSet();
	}

	/**
	 * Set if a new Session should be created when no transactional Session
	 * can be found for the current thread.
	 * <p>TopLinkTemplate is aware of a corresponding Session bound to the
	 * current thread, for example when using TopLinkTransactionManager.
	 * If allowCreate is true, a new non-transactional Session will be created
	 * if none found, which needs to be closed at the end of the operation.
	 * If false, an IllegalStateException will get thrown in this case.
	 * @see SessionFactoryUtils#getSession(SessionFactory, boolean)
	 */
	public void setAllowCreate(boolean allowCreate) {
		this.allowCreate = allowCreate;
	}

	/**
	 * Return if a new Session should be created if no thread-bound found.
	 */
	public boolean isAllowCreate() {
		return this.allowCreate;
	}


	public Object execute(TopLinkCallback action) throws DataAccessException {
		Assert.notNull(action, "Callback object must not be null");

		Session session = SessionFactoryUtils.getSession(getSessionFactory(), this.allowCreate);
		try {
			return action.doInTopLink(session);
		}
		catch (TopLinkException ex) {
			throw convertTopLinkAccessException(ex);
		}
		catch (RuntimeException ex) {
			// callback code threw application exception
			throw ex;
		}
		finally {
			SessionFactoryUtils.releaseSession(session, getSessionFactory());
		}
	}

	public List executeFind(TopLinkCallback action) throws DataAccessException {
		Object result = execute(action);
		if (result != null && !(result instanceof List)) {
			throw new InvalidDataAccessApiUsageException(
					"Result object returned from TopLinkCallback isn't a List: [" + result + "]");
		}
		return (List) result;
	}


	//-------------------------------------------------------------------------
	// Convenience methods for executing generic queries
	//-------------------------------------------------------------------------

	public Object executeNamedQuery(Class entityClass, String queryName) throws DataAccessException {
		return executeNamedQuery(entityClass, queryName, null, false);
	}

	public Object executeNamedQuery(Class entityClass, String queryName, boolean enforceReadOnly)
			throws DataAccessException {

		return executeNamedQuery(entityClass, queryName, null, enforceReadOnly);
	}

	public Object executeNamedQuery(Class entityClass, String queryName, Object[] args)
			throws DataAccessException {

		return executeNamedQuery(entityClass, queryName, args, false);
	}

	public Object executeNamedQuery(
			final Class entityClass, final String queryName, final Object[] args, final boolean enforceReadOnly)
			throws DataAccessException {

		return execute(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				if (args != null) {
					return session.executeQuery(queryName, entityClass, new Vector(Arrays.asList(args)));
				}
				else {
					return session.executeQuery(queryName, entityClass, new Vector());
				}
			}
		});
	}

	public Object executeQuery(DatabaseQuery query) throws DataAccessException {
		return executeQuery(query, null, false);
	}

	public Object executeQuery(DatabaseQuery query, boolean enforceReadOnly) throws DataAccessException {
		return executeQuery(query, null, enforceReadOnly);
	}

	public Object executeQuery(DatabaseQuery query, Object[] args) throws DataAccessException {
		return executeQuery(query, args, false);
	}

	public Object executeQuery(final DatabaseQuery query, final Object[] args, final boolean enforceReadOnly)
			throws DataAccessException {

		return execute(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				if (args != null) {
					return session.executeQuery(query, new Vector(Arrays.asList(args)));
				}
				else {
					return session.executeQuery(query);
				}
			}
		});
	}


	//-------------------------------------------------------------------------
	// Convenience methods for reading a specific set of objects
	//-------------------------------------------------------------------------

	public List readAll(Class entityClass) throws DataAccessException {
		return readAll(entityClass, false);
	}

	public List readAll(final Class entityClass, final boolean enforceReadOnly) throws DataAccessException {
		return executeFind(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				return session.readAllObjects(entityClass);
			}
		});
	}

	public List readAll(Class entityClass, Expression expression) throws DataAccessException {
		return readAll(entityClass, expression, false);
	}

	public List readAll(final Class entityClass, final Expression expression, final boolean enforceReadOnly)
			throws DataAccessException {

		return executeFind(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				return session.readAllObjects(entityClass, expression);
			}
		});
	}

	public List readAll(Class entityClass, Call call) throws DataAccessException {
		return readAll(entityClass, call, false);
	}

	public List readAll(final Class entityClass, final Call call, final boolean enforceReadOnly)
			throws DataAccessException {

		return executeFind(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				return session.readAllObjects(entityClass, call);
			}
		});
	}

	public Object read(Class entityClass, Expression expression) throws DataAccessException {
		return read(entityClass, expression, false);
	}

	public Object read(final Class entityClass, final Expression expression, final boolean enforceReadOnly)
			throws DataAccessException {

		return execute(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				return session.readObject(entityClass, expression);
			}
		});
	}

	public Object read(Class entityClass, Call call) throws DataAccessException {
		return read(entityClass, call, false);
	}

	public Object read(final Class entityClass, final Call call, final boolean enforceReadOnly)
			throws DataAccessException {

		return execute(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				return session.readObject(entityClass, call);
			}
		});
	}


	//-------------------------------------------------------------------------
	// Convenience methods for reading an individual object by id
	//-------------------------------------------------------------------------

	public Object readById(Class entityClass, Object id) throws DataAccessException {
		return readById(entityClass, id, false);
	}

	public Object readById(Class entityClass, Object id, boolean enforceReadOnly) throws DataAccessException {
		return readById(entityClass, new Object[] {id}, enforceReadOnly);
	}

	public Object readById(Class entityClass, Object[] keys) throws DataAccessException {
		return readById(entityClass, keys, false);
	}

	public Object readById(final Class entityClass, final Object[] keys, final boolean enforceReadOnly)
			throws DataAccessException {

		Assert.isTrue(keys != null && keys.length > 0, "Non-empty keys or id is required");

		ReadObjectQuery query = new ReadObjectQuery(entityClass);
		query.setSelectionKey(new Vector(Arrays.asList(keys)));
		Object result = executeQuery(query, enforceReadOnly);

		if (result == null) {
			Object identifier = (keys.length == 1 ? keys[0] : StringUtils.arrayToCommaDelimitedString(keys));
			throw new ObjectRetrievalFailureException(entityClass, identifier);
		}
		return result;
	}

	public Object readAndCopy(Class entityClass, Object id) throws DataAccessException {
		return readAndCopy(entityClass, id, false);
	}

	public Object readAndCopy(Class entityClass, Object id, boolean enforceReadOnly)
			throws DataAccessException {

		Object entity = readById(entityClass, id, enforceReadOnly);
		return copy(entity);
	}

	public Object readAndCopy(Class entityClass, Object[] keys) throws DataAccessException {
		return readAndCopy(entityClass, keys, false);
	}

	public Object readAndCopy(Class entityClass, Object[] keys, boolean enforceReadOnly)
			throws DataAccessException {

		Object entity = readById(entityClass, keys, enforceReadOnly);
		return copy(entity);
	}


	//-------------------------------------------------------------------------
	// Convenience methods for copying and refreshing objects
	//-------------------------------------------------------------------------

	public Object copy(Object entity) throws DataAccessException {
		ObjectCopyingPolicy copyingPolicy = new ObjectCopyingPolicy();
		copyingPolicy.cascadeAllParts();
		copyingPolicy.setShouldResetPrimaryKey(false);
		return copy(entity, copyingPolicy);
	}

	public Object copy(final Object entity, final ObjectCopyingPolicy copyingPolicy)
			throws DataAccessException {

		return execute(new TopLinkCallback() {
			public Object doInTopLink(Session session) throws TopLinkException {
				return session.copyObject(entity, copyingPolicy);
			}
		});
	}

	public List copyAll(Collection entities) throws DataAccessException {
		ObjectCopyingPolicy copyingPolicy = new ObjectCopyingPolicy();
		copyingPolicy.cascadeAllParts();
		copyingPolicy.setShouldResetPrimaryKey(false);
		return copyAll(entities, copyingPolicy);
	}

	public List copyAll(final Collection entities, final ObjectCopyingPolicy copyingPolicy)
			throws DataAccessException {

		return (List) execute(new TopLinkCallback() {
			public Object doInTopLink(Session session) throws TopLinkException {
				List result = new ArrayList(entities.size());
				for (Iterator it = entities.iterator(); it.hasNext();) {
					Object entity = it.next();
					result.add(session.copyObject(entity, copyingPolicy));
				}
				return result;
			}
		});
	}

	public Object refresh(Object entity) throws DataAccessException {
		return refresh(entity, false);
	}

	public Object refresh(final Object entity, final boolean enforceReadOnly) throws DataAccessException {
		return execute(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				return session.refreshObject(entity);
			}
		});
	}

	public List refreshAll(Collection entities) throws DataAccessException {
		return refreshAll(entities, false);
	}

	public List refreshAll(final Collection entities, final boolean enforceReadOnly) throws DataAccessException {
		return (List) execute(new SessionReadCallback(enforceReadOnly) {
			protected Object readFromSession(Session session) throws TopLinkException {
				List result = new ArrayList(entities.size());
				for (Iterator it = entities.iterator(); it.hasNext();) {
					Object entity = it.next();
					result.add(session.refreshObject(entity));
				}
				return result;
			}
		});
	}


	//-------------------------------------------------------------------------
	// Convenience methods for persisting and deleting objects
	//-------------------------------------------------------------------------

	public Object register(final Object entity) {
		return execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.registerObject(entity);
			}
		});
	}

	public List registerAll(final Collection entities) {
		return (List) execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.registerAllObjects(entities);
			}
		});
	}

	public void registerNew(final Object entity) {
		execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.registerNewObject(entity);
			}
		});
	}

	public Object registerExisting(final Object entity) {
		return execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.registerExistingObject(entity);
			}
		});
	}

	public Object merge(final Object entity) throws DataAccessException {
		return execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.mergeClone(entity);
			}
		});
	}

	public Object deepMerge(final Object entity) throws DataAccessException {
		return execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.deepMergeClone(entity);
			}
		});
	}

	public Object shallowMerge(final Object entity) throws DataAccessException {
		return execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.shallowMergeClone(entity);
			}
		});
	}

	public Object mergeWithReferences(final Object entity) throws DataAccessException {
		return execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.mergeCloneWithReferences(entity);
			}
		});
	}

	public void delete(final Object entity) throws DataAccessException {
		execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				return unitOfWork.deleteObject(entity);
			}
		});
	}

	public void deleteAll(final Collection entities) throws DataAccessException {
		execute(new UnitOfWorkCallback() {
			protected Object doInUnitOfWork(UnitOfWork unitOfWork) throws TopLinkException {
				unitOfWork.deleteAllObjects(entities);
				return null;
			}
		});
	}

}

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