storage/src/mozStorageAsyncStatement.h
author Karl Tomlinson <karlt+@karlt.net>
Tue, 30 Nov 2010 15:44:35 +0000
changeset 58371 3e3726fc8083971b223952a29cf2289ed0915867
parent 39769 9f3391b5ca0ca5e00b39f440639dd7c9009e63cc
child 94475 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
bug 615121 - fix operator precedence error in glyph yoffset. r=jfkthame a=blocking-betaN

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 * for the specific language governing rights and limitations under the
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 * The Original Code is Oracle Corporation code.
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 * The Initial Developer of the Original Code is
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 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir.vukicevic@oracle.com>
 *   Andrew Sutherland <asutherland@asutherland.org>
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#ifndef mozilla_storage_mozStorageAsyncStatement_h_
#define mozilla_storage_mozStorageAsyncStatement_h_

#include "nsAutoPtr.h"
#include "nsString.h"

#include "nsTArray.h"

#include "mozStorageBindingParamsArray.h"
#include "mozStorageStatementData.h"
#include "mozIStorageAsyncStatement.h"
#include "StorageBaseStatementInternal.h"

class nsIXPConnectJSObjectHolder;
struct sqlite3_stmt;

namespace mozilla {
namespace storage {

class AsyncStatementJSHelper;
class Connection;

class AsyncStatement : public mozIStorageAsyncStatement
                     , public StorageBaseStatementInternal
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_MOZISTORAGEASYNCSTATEMENT
  NS_DECL_MOZISTORAGEBASESTATEMENT
  NS_DECL_MOZISTORAGEBINDINGPARAMS
  NS_DECL_STORAGEBASESTATEMENTINTERNAL

  AsyncStatement();

  /**
   * Initializes the object on aDBConnection by preparing the SQL statement
   * given by aSQLStatement.
   *
   * @param aDBConnection
   *        The Connection object this statement is associated with.
   * @param aSQLStatement
   *        The SQL statement to prepare that this object will represent.
   */
  nsresult initialize(Connection *aDBConnection,
                      const nsACString &aSQLStatement);

  /**
   * Obtains and transfers ownership of the array of parameters that are bound
   * to this statment.  This can be null.
   */
  inline already_AddRefed<BindingParamsArray> bindingParamsArray()
  {
    return mParamsArray.forget();
  }


private:
  ~AsyncStatement();

  /**
   * Clean up the references JS helpers hold to us.  For cycle-avoidance reasons
   * they do not hold reference-counted references to us, so it is important
   * we do this.
   */
  void cleanupJSHelpers();

  /**
   * @return a pointer to the BindingParams object to use with our Bind*
   *         method.
   */
  mozIStorageBindingParams *getParams();

  /**
   * The SQL string as passed by the user.  We store it because we create the
   * async statement on-demand on the async thread.
   */
  nsCString mSQLString;

  /**
   * Holds the array of parameters to bind to this statement when we execute
   * it asynchronously.
   */
  nsRefPtr<BindingParamsArray> mParamsArray;

  /**
   * Caches the JS 'params' helper for this statement.
   */
  nsCOMPtr<nsIXPConnectJSObjectHolder> mStatementParamsHolder;

  /**
   * Have we been explicitly finalized by the user?
   */
  bool mFinalized;

  /**
   * Required for access to private mStatementParamsHolder field by
   * AsyncStatementJSHelper::getParams.
   */
  friend class AsyncStatementJSHelper;
};

} // storage
} // mozilla

#endif // mozilla_storage_mozStorageAsyncStatement_h_