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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
* third-party contributors as indicated by either @author tags or express
* copyright attribution statements applied by the authors. All
* third-party contributions are distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.engine.jdbc;
import java.sql.Blob;
import java.sql.SQLException;
import java.sql.Clob;
import java.sql.Connection;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import org.hibernate.HibernateException;
import org.hibernate.JDBCException;
/**
* {@link LobCreator} implementation using contextual creation against the JDBC {@link java.sql.Connection} class's LOB creation
* methods.
*
* @author Steve Ebersole
* @author Gail Badner
*/
public class ContextualLobCreator extends AbstractLobCreator implements LobCreator {
private LobCreationContext lobCreationContext;
public ContextualLobCreator(LobCreationContext lobCreationContext) {
this.lobCreationContext = lobCreationContext;
}
/**
* Create the basic contextual BLOB reference.
*
* @return The created BLOB reference.
*/
public Blob createBlob() {
return ( Blob ) lobCreationContext.execute( CREATE_BLOB_CALLBACK );
}
/**
* {@inheritDoc}
*/
public Blob createBlob(byte[] bytes) {
try {
Blob blob = createBlob();
blob.setBytes( 1, bytes );
return blob;
}
catch ( SQLException e ) {
throw new JDBCException( "Unable to set BLOB bytes after creation", e );
}
}
/**
* {@inheritDoc}
*/
public Blob createBlob(InputStream inputStream, long length) {
try {
Blob blob = createBlob();
OutputStream byteStream = blob.setBinaryStream( 1 );
StreamUtils.copy( inputStream, byteStream );
byteStream.flush();
byteStream.close();
// todo : validate length written versus length given?
return blob;
}
catch ( SQLException e ) {
throw new JDBCException( "Unable to prepare BLOB binary stream for writing",e );
}
catch ( IOException e ) {
throw new HibernateException( "Unable to write stream contents to BLOB", e );
}
}
/**
* Create the basic contextual CLOB reference.
*
* @return The created CLOB reference.
*/
public Clob createClob() {
return ( Clob ) lobCreationContext.execute( CREATE_CLOB_CALLBACK );
}
/**
* {@inheritDoc}
*/
public Clob createClob(String string) {
try {
Clob clob = createClob();
clob.setString( 1, string );
return clob;
}
catch ( SQLException e ) {
throw new JDBCException( "Unable to set CLOB string after creation", e );
}
}
/**
* {@inheritDoc}
*/
public Clob createClob(Reader reader, long length) {
try {
Clob clob = createClob();
Writer writer = clob.setCharacterStream( 1 );
StreamUtils.copy( reader, writer );
writer.flush();
writer.close();
return clob;
}
catch ( SQLException e ) {
throw new JDBCException( "Unable to prepare CLOB stream for writing", e );
}
catch ( IOException e ) {
throw new HibernateException( "Unable to write CLOB stream content", e );
}
}
/**
* Create the basic contextual NCLOB reference.
*
* @return The created NCLOB reference.
*/
public Clob createNClob() {
return ( Clob ) lobCreationContext.execute( CREATE_NCLOB_CALLBACK );
}
/**
* {@inheritDoc}
*/
public Clob createNClob(String string) {
try {
Clob clob = createNClob();
clob.setString( 1, string );
return clob;
}
catch ( SQLException e ) {
throw new JDBCException( "Unable to set NCLOB string after creation", e );
}
}
/**
* {@inheritDoc}
*/
public Clob createNClob(Reader reader, long length) {
try {
Clob clob = createNClob();
Writer writer = clob.setCharacterStream( 1 );
StreamUtils.copy( reader, writer );
writer.flush();
writer.close();
return clob;
}
catch ( SQLException e ) {
throw new JDBCException( "Unable to prepare NCLOB stream for writing", e );
}
catch ( IOException e ) {
throw new HibernateException( "Unable to write NCLOB stream content", e );
}
}
private static final Class[] CREATION_METHOD_SIG = new Class[0];
private static final Object[] CREATION_METHOD_ARGS = new Object[0];
private static final LobCreationContext.Callback CREATE_BLOB_CALLBACK;
private static final LobCreationContext.Callback CREATE_CLOB_CALLBACK;
private static final LobCreationContext.Callback CREATE_NCLOB_CALLBACK;
static {
CREATE_BLOB_CALLBACK = new CallbackImpl( getConnectionlobCreationMethod( "createBlob" ) );
CREATE_CLOB_CALLBACK = new CallbackImpl( getConnectionlobCreationMethod( "createClob" ) );
CREATE_NCLOB_CALLBACK = new CallbackImpl( getConnectionlobCreationMethod( "createNClob" ) );
}
private static class CallbackImpl implements LobCreationContext.Callback {
private final Method creationMethod;
private CallbackImpl(Method creationMethod) {
this.creationMethod = creationMethod;
}
public Object executeOnConnection(Connection connection) throws SQLException {
try {
return creationMethod.invoke( connection, CREATION_METHOD_ARGS );
}
catch ( InvocationTargetException e ) {
if ( e.getTargetException() instanceof SQLException ) {
throw ( SQLException ) e.getTargetException();
}
else {
throw new HibernateException( "Exception invoking " + creationMethod.getName(), e.getTargetException() );
}
}
catch ( AbstractMethodError e ) {
// this again is a big big error...
throw new IllegalStateException( "Useable implementation of " + creationMethod.getName() + " not found." );
}
catch ( IllegalAccessException e ) {
// this again is a big big error...
throw new IllegalStateException( "Illegal access attempt on JDBC method " + creationMethod.getName() );
}
}
}
private static Method getConnectionlobCreationMethod(String methodName) {
try {
return Connection.class.getMethod( methodName, CREATION_METHOD_SIG );
}
catch ( NoSuchMethodException e ) {
// this is a big big error if we get here and these methods are not part of the Connection interface...
throw new IllegalStateException( "JDBC driver did not implement " + methodName);
}
}
}
