/*
Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FLOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
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 General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc.jdbc2.optional;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.NClob;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import com.mysql.jdbc.ConnectionImpl;
import com.mysql.jdbc.SQLError;
import com.mysql.jdbc.jdbc2.optional.ConnectionWrapper;
import com.mysql.jdbc.jdbc2.optional.MysqlPooledConnection;
/**
*/
public class JDBC4StatementWrapper extends StatementWrapper {
public JDBC4StatementWrapper(ConnectionWrapper c,
MysqlPooledConnection conn,
Statement toWrap) {
super(c, conn, toWrap);
}
public void close() throws SQLException {
try {
super.close();
} finally {
this.unwrappedInterfaces = null;
}
}
public boolean isClosed() throws SQLException {
try {
if (this.wrappedStmt != null) {
return this.wrappedStmt.isClosed();
} else {
throw SQLError.createSQLException("Statement already closed",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
} catch (SQLException sqlEx) {
checkAndFireConnectionError(sqlEx);
}
return false; // We never get here, compiler can't tell
}
public void setPoolable(boolean poolable) throws SQLException {
try {
if (this.wrappedStmt != null) {
this.wrappedStmt.setPoolable(poolable);
} else {
throw SQLError.createSQLException("Statement already closed",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
} catch (SQLException sqlEx) {
checkAndFireConnectionError(sqlEx);
}
}
public boolean isPoolable() throws SQLException {
try {
if (this.wrappedStmt != null) {
return this.wrappedStmt.isPoolable();
} else {
throw SQLError.createSQLException("Statement already closed",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
} catch (SQLException sqlEx) {
checkAndFireConnectionError(sqlEx);
}
return false; // We never get here, compiler can't tell
}
/**
* Returns true if this either implements the interface argument or is
* directly or indirectly a wrapper for an object that does. Returns false
* otherwise. If this implements the interface then return true, else if
* this is a wrapper then return the result of recursively calling
* <code>isWrapperFor</code> on the wrapped object. If this does not
* implement the interface and is not a wrapper, return false. This method
* should be implemented as a low-cost operation compared to
* <code>unwrap</code> so that callers can use this method to avoid
* expensive <code>unwrap</code> calls that may fail. If this method
* returns true then calling <code>unwrap</code> with the same argument
* should succeed.
*
* @param interfaces
* a Class defining an interface.
* @return true if this implements the interface or directly or indirectly
* wraps an object that does.
* @throws java.sql.SQLException
* if an error occurs while determining whether this is a
* wrapper for an object with the given interface.
* @since 1.6
*/
public boolean isWrapperFor(Class<?> iface) throws SQLException {
boolean isInstance = iface.isInstance(this);
if (isInstance) {
return true;
}
String interfaceClassName = iface.getName();
return (interfaceClassName.equals("com.mysql.jdbc.Statement")
|| interfaceClassName.equals("java.sql.Statement")
|| interfaceClassName.equals("java.sql.Wrapper"));
}
/**
* Returns an object that implements the given interface to allow access to
* non-standard methods, or standard methods not exposed by the proxy. The
* result may be either the object found to implement the interface or a
* proxy for that object. If the receiver implements the interface then that
* is the object. If the receiver is a wrapper and the wrapped object
* implements the interface then that is the object. Otherwise the object is
* the result of calling <code>unwrap</code> recursively on the wrapped
* object. If the receiver is not a wrapper and does not implement the
* interface, then an <code>SQLException</code> is thrown.
*
* @param iface
* A Class defining an interface that the result must implement.
* @return an object that implements the interface. May be a proxy for the
* actual implementing object.
* @throws java.sql.SQLException
* If no object found that implements the interface
* @since 1.6
*/
public synchronized <T> T unwrap(java.lang.Class<T> iface)
throws java.sql.SQLException {
try {
if ("java.sql.Statement".equals(iface.getName())
|| "java.sql.Wrapper.class".equals(iface.getName())) {
return iface.cast(this);
}
if (unwrappedInterfaces == null) {
unwrappedInterfaces = new HashMap();
}
Object cachedUnwrapped = unwrappedInterfaces.get(iface);
if (cachedUnwrapped == null) {
cachedUnwrapped = Proxy.newProxyInstance(
this.wrappedStmt.getClass().getClassLoader(),
new Class[] { iface },
new ConnectionErrorFiringInvocationHandler(this.wrappedStmt));
unwrappedInterfaces.put(iface, cachedUnwrapped);
}
return iface.cast(cachedUnwrapped);
} catch (ClassCastException cce) {
throw SQLError.createSQLException("Unable to unwrap to "
+ iface.toString(), SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
}
}