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Spring Framework example source code file (AbstractLobType.java)

This example Spring Framework source code file (AbstractLobType.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

abstractlobtype, hibernateexception, hibernateexception, i/o, illegalstateexception, io, ioexception, ioexception, jdbc, lobhandler, no, object, object, serializable, sql, sqlexception, sqlexception, transaction

The Spring Framework AbstractLobType.java source code

/*
 * Copyright 2002-2006 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.hibernate3.support;

import java.io.IOException;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.transaction.Status;
import javax.transaction.TransactionManager;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
import org.hibernate.util.EqualsHelper;

import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.jdbc.support.lob.JtaLobCreatorSynchronization;
import org.springframework.jdbc.support.lob.LobCreator;
import org.springframework.jdbc.support.lob.LobHandler;
import org.springframework.jdbc.support.lob.SpringLobCreatorSynchronization;
import org.springframework.jdbc.support.lob.LobCreatorUtils;
import org.springframework.orm.hibernate3.LocalSessionFactoryBean;
import org.springframework.transaction.support.TransactionSynchronizationManager;

/**
 * Abstract base class for Hibernate UserType implementations that map to LOBs.
 * Retrieves the LobHandler to use from LocalSessionFactoryBean at config time.
 *
 * <p>For writing LOBs, either an active Spring transaction synchronization
 * or an active JTA transaction (with "jtaTransactionManager" specified on
 * LocalSessionFactoryBean or a Hibernate TransactionManagerLookup configured
 * through the corresponding Hibernate property) is required.
 *
 * <p>Offers template methods for setting parameters and getting result values,
 * passing in the LobHandler or LobCreator to use.
 *
 * @author Juergen Hoeller
 * @since 1.2
 * @see org.springframework.jdbc.support.lob.LobHandler
 * @see org.springframework.jdbc.support.lob.LobCreator
 * @see org.springframework.orm.hibernate3.LocalSessionFactoryBean#setLobHandler
 * @see org.springframework.orm.hibernate3.LocalSessionFactoryBean#setJtaTransactionManager
 */
public abstract class AbstractLobType implements UserType {

	protected final Log logger = LogFactory.getLog(getClass());

	private final LobHandler lobHandler;

	private final TransactionManager jtaTransactionManager;


	/**
	 * Constructor used by Hibernate: fetches config-time LobHandler and
	 * config-time JTA TransactionManager from LocalSessionFactoryBean.
	 * @see org.springframework.orm.hibernate3.LocalSessionFactoryBean#getConfigTimeLobHandler
	 * @see org.springframework.orm.hibernate3.LocalSessionFactoryBean#getConfigTimeTransactionManager
	 */
	protected AbstractLobType() {
		this(LocalSessionFactoryBean.getConfigTimeLobHandler(),
		    LocalSessionFactoryBean.getConfigTimeTransactionManager());
	}

	/**
	 * Constructor used for testing: takes an explicit LobHandler
	 * and an explicit JTA TransactionManager (can be <code>null).
	 */
	protected AbstractLobType(LobHandler lobHandler, TransactionManager jtaTransactionManager) {
		this.lobHandler = lobHandler;
		this.jtaTransactionManager = jtaTransactionManager;
	}


	/**
	 * This implementation returns false.
	 */
	public boolean isMutable() {
		return false;
	}

	/**
	 * This implementation delegates to the Hibernate EqualsHelper.
	 * @see org.hibernate.util.EqualsHelper#equals
	 */
	public boolean equals(Object x, Object y) throws HibernateException {
		return EqualsHelper.equals(x, y);
	}

	/**
	 * This implementation returns the hashCode of the given objectz.
	 */
	public int hashCode(Object x) throws HibernateException {
		return x.hashCode();
	}

	/**
	 * This implementation returns the passed-in value as-is.
	 */
	public Object deepCopy(Object value) throws HibernateException {
		return value;
	}

	/**
	 * This implementation returns the passed-in value as-is.
	 */
	public Serializable disassemble(Object value) throws HibernateException {
		return (Serializable) value;
	}

	/**
	 * This implementation returns the passed-in value as-is.
	 */
	public Object assemble(Serializable cached, Object owner) throws HibernateException {
		return cached;
	}

	/**
	 * This implementation returns the passed-in original as-is.
	 */
	public Object replace(Object original, Object target, Object owner) throws HibernateException {
		return original;
	}


	/**
	 * This implementation delegates to nullSafeGetInternal,
	 * passing in the LobHandler of this type.
	 * @see #nullSafeGetInternal
	 */
	public final Object nullSafeGet(ResultSet rs, String[] names, Object owner)
			throws HibernateException, SQLException {

		if (this.lobHandler == null) {
			throw new IllegalStateException("No LobHandler found for configuration - " +
			    "lobHandler property must be set on LocalSessionFactoryBean");
		}

		try {
			return nullSafeGetInternal(rs, names, owner, this.lobHandler);
		}
		catch (IOException ex) {
			throw new HibernateException("I/O errors during LOB access", ex);
		}
	}

	/**
	 * This implementation delegates to nullSafeSetInternal,
	 * passing in a transaction-synchronized LobCreator for the
	 * LobHandler of this type.
	 * @see #nullSafeSetInternal
	 */
	public final void nullSafeSet(PreparedStatement st, Object value, int index)
			throws HibernateException, SQLException {

		if (this.lobHandler == null) {
			throw new IllegalStateException("No LobHandler found for configuration - " +
			    "lobHandler property must be set on LocalSessionFactoryBean");
		}

		LobCreator lobCreator = this.lobHandler.getLobCreator();
		try {
			nullSafeSetInternal(st, index, value, lobCreator);
		}
		catch (IOException ex) {
			throw new HibernateException("I/O errors during LOB access", ex);
		}
		LobCreatorUtils.registerTransactionSynchronization(lobCreator, this.jtaTransactionManager);
	}

	/**
	 * Template method to extract a value from the given result set.
	 * @param rs the ResultSet to extract from
	 * @param names the column names
	 * @param owner the containing entity
	 * @param lobHandler the LobHandler to use
	 * @return the extracted value
	 * @throws SQLException if thrown by JDBC methods
	 * @throws IOException if thrown by streaming methods
	 * @throws HibernateException in case of any other exceptions
	 */
	protected abstract Object nullSafeGetInternal(
			ResultSet rs, String[] names, Object owner, LobHandler lobHandler)
			throws SQLException, IOException, HibernateException;

	/**
	 * Template method to set the given parameter value on the given statement.
	 * @param ps the PreparedStatement to set on
	 * @param index the statement parameter index
	 * @param value the value to set
	 * @param lobCreator the LobCreator to use
	 * @throws SQLException if thrown by JDBC methods
	 * @throws IOException if thrown by streaming methods
	 * @throws HibernateException in case of any other exceptions
	 */
	protected abstract void nullSafeSetInternal(
	    PreparedStatement ps, int index, Object value, LobCreator lobCreator)
			throws SQLException, IOException, HibernateException;

}

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