/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @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.internal.proxy;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.engine.jdbc.spi.JdbcResourceRegistry;
import org.hibernate.engine.jdbc.spi.JdbcServices;
import org.hibernate.engine.jdbc.spi.LogicalConnectionImplementor;
import org.jboss.logging.Logger;
/**
* Basic support for building {@link Statement}-based proxy handlers
*
* @author Steve Ebersole
*/
public abstract class AbstractStatementProxyHandler extends AbstractProxyHandler {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class,
AbstractStatementProxyHandler.class.getName());
private ConnectionProxyHandler connectionProxyHandler;
private Connection connectionProxy;
private Statement statement;
protected AbstractStatementProxyHandler(
Statement statement,
ConnectionProxyHandler connectionProxyHandler,
Connection connectionProxy) {
super( statement.hashCode() );
this.statement = statement;
this.connectionProxyHandler = connectionProxyHandler;
this.connectionProxy = connectionProxy;
}
protected ConnectionProxyHandler getConnectionProxy() {
errorIfInvalid();
return connectionProxyHandler;
}
protected JdbcServices getJdbcServices() {
return getConnectionProxy().getJdbcServices();
}
protected JdbcResourceRegistry getResourceRegistry() {
return getConnectionProxy().getResourceRegistry();
}
protected Statement getStatement() {
errorIfInvalid();
return statement;
}
protected Statement getStatementWithoutChecks() {
return statement;
}
@Override
protected Object continueInvocation(Object proxy, Method method, Object[] args) throws Throwable {
String methodName = method.getName();
LOG.trace("Handling invocation of statement method [" + methodName + "]");
// other methods allowed while invalid ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if ( "close".equals( methodName ) ) {
explicitClose( ( Statement ) proxy );
return null;
}
if ( "invalidate".equals( methodName ) ) {
invalidateHandle();
return null;
}
errorIfInvalid();
// handle the JDBC 4 Wrapper#isWrapperFor and Wrapper#unwrap calls
// these cause problems to the whole proxy scheme though as we need to return the raw objects
if ( "isWrapperFor".equals( methodName ) && args.length == 1 ) {
return method.invoke( getStatementWithoutChecks(), args );
}
if ( "unwrap".equals( methodName ) && args.length == 1 ) {
return method.invoke( getStatementWithoutChecks(), args );
}
if ( "getWrappedObject".equals( methodName ) ) {
return getStatementWithoutChecks();
}
if ( "getConnection".equals( methodName ) ) {
return connectionProxy;
}
beginningInvocationHandling( method, args );
try {
Object result = method.invoke( statement, args );
result = wrapIfNecessary( result, proxy, method );
return result;
}
catch ( InvocationTargetException e ) {
Throwable realException = e.getTargetException();
if ( SQLException.class.isInstance( realException ) ) {
throw connectionProxyHandler.getJdbcServices().getSqlExceptionHelper()
.convert( ( SQLException ) realException, realException.getMessage() );
}
else {
throw realException;
}
}
}
private Object wrapIfNecessary(Object result, Object proxy, Method method) {
if ( !( ResultSet.class.isAssignableFrom( method.getReturnType() ) ) ) {
return result;
}
final ResultSet wrapper;
if ( "getGeneratedKeys".equals( method.getName() ) ) {
wrapper = ProxyBuilder.buildImplicitResultSet( ( ResultSet ) result, connectionProxyHandler, connectionProxy, ( Statement ) proxy );
}
else {
wrapper = ProxyBuilder.buildResultSet( ( ResultSet ) result, this, ( Statement ) proxy );
}
getResourceRegistry().register( wrapper );
return wrapper;
}
protected void beginningInvocationHandling(Method method, Object[] args) {
}
private void explicitClose(Statement proxy) {
if ( isValid() ) {
LogicalConnectionImplementor lc = getConnectionProxy().getLogicalConnection();
getResourceRegistry().release( proxy );
lc.afterStatementExecution();
}
}
private void invalidateHandle() {
connectionProxyHandler = null;
statement = null;
invalidate();
}
}