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JDBC4StatementWrapper.java

/*
 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;

/**
 */
00056 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
       */
00137       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
       */
00171       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);
            }
      }
}

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