source: Ballon/out/artifacts/geisa_artifact/WEB-INF/lib/mysql-connector-java-5.1.21/src/com/mysql/jdbc/jdbc2/optional/JDBC4StatementWrapper.java @ 848

/*
 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);
                }
        }
}