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330 lines
14 KiB
C++
330 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 sts=2 expandtab
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_storage_StorageBaseStatementInternal_h_
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#define mozilla_storage_StorageBaseStatementInternal_h_
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#include "nsISupports.h"
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#include "nsCOMPtr.h"
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#include "nsAutoPtr.h"
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struct sqlite3_stmt;
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class mozIStorageError;
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class mozIStorageBindingParamsArray;
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class mozIStorageBindingParams;
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class mozIStorageStatementCallback;
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class mozIStoragePendingStatement;
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namespace mozilla {
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namespace storage {
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#define STORAGEBASESTATEMENTINTERNAL_IID \
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{0xd18856c9, 0xbf07, 0x4ae2, {0x94, 0x5b, 0x1a, 0xdd, 0x49, 0x19, 0x55, 0x2a}}
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class Connection;
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class StatementData;
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class AsyncStatementFinalizer;
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/**
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* Implementation-only interface and shared logix mix-in corresponding to
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* mozIStorageBaseStatement. Both Statement and AsyncStatement inherit from
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* this. The interface aspect makes them look the same to implementation innards
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* that aren't publicly accessible. The mix-in avoids code duplication in
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* common implementations of mozIStorageBaseStatement, albeit with some minor
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* performance/space overhead because we have to use defines to officially
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* implement the methods on Statement/AsyncStatement (and proxy to this base
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* class.)
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*/
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class StorageBaseStatementInternal : public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(STORAGEBASESTATEMENTINTERNAL_IID)
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/**
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* @return the connection that this statement belongs to.
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*/
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Connection *getOwner()
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{
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return mDBConnection;
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}
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/**
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* Return the asynchronous statement, creating it if required.
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*
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* This is for use by the asynchronous execution code for StatementData
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* created by AsyncStatements. Statement internally uses this method to
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* prepopulate StatementData with the sqlite3_stmt.
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*
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* @param[out] stmt
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* The sqlite3_stmt for asynchronous use.
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* @return The SQLite result code for creating the statement if created,
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* SQLITE_OK if creation was not required.
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*/
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virtual int getAsyncStatement(sqlite3_stmt **_stmt) = 0;
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/**
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* Obtains the StatementData needed for asynchronous execution.
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*
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* This is for use by Connection to retrieve StatementData from statements
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* when executeAsync is invoked.
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*
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* @param[out] _data
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* A reference to a StatementData object that will be populated
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* upon successful execution of this method.
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* @return NS_OK if we were able to assemble the data, failure otherwise.
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*/
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virtual nsresult getAsynchronousStatementData(StatementData &_data) = 0;
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/**
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* Construct a new BindingParams to be owned by the provided binding params
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* array. This method exists so that BindingParamsArray does not need
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* factory logic to determine what type of BindingParams to instantiate.
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*
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* @param aOwner
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* The binding params array to own the newly created binding params.
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* @return The new mozIStorageBindingParams instance appropriate to the
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* underlying statement type.
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*/
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virtual already_AddRefed<mozIStorageBindingParams> newBindingParams(
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mozIStorageBindingParamsArray *aOwner
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) = 0;
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protected: // mix-in bits are protected
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StorageBaseStatementInternal();
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nsRefPtr<Connection> mDBConnection;
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/**
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* Our asynchronous statement.
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*
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* For Statement this is populated by the first invocation to
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* getAsyncStatement.
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*
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* For AsyncStatement, this is null at creation time and initialized by the
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* async thread when it calls getAsyncStatement the first time the statement
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* is executed. (Or in the event of badly formed SQL, every time.)
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*/
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sqlite3_stmt *mAsyncStatement;
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/**
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* Initiate asynchronous finalization by dispatching an event to the
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* asynchronous thread to finalize mAsyncStatement. This acquires a reference
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* to this statement and proxies it back to the connection's owning thread
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* for release purposes.
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*
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* In the event the asynchronous thread is already gone or we otherwise fail
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* to dispatch an event to it we failover to invoking internalAsyncFinalize
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* directly. (That's what the asynchronous finalizer would have called.)
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*
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* @note You must not call this method from your destructor because its
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* operation assumes we are still alive. Call internalAsyncFinalize
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* directly in that case.
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*/
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void asyncFinalize();
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/**
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* Cleanup the async sqlite3_stmt stored in mAsyncStatement if it exists by
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* attempting to dispatch to the asynchronous thread if available, finalizing
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* on this thread if it is not.
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*
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* @note Call this from your destructor, call asyncFinalize otherwise.
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*/
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void destructorAsyncFinalize();
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NS_IMETHOD NewBindingParamsArray(mozIStorageBindingParamsArray **_array);
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NS_IMETHOD ExecuteAsync(mozIStorageStatementCallback *aCallback,
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mozIStoragePendingStatement **_stmt);
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NS_IMETHOD EscapeStringForLIKE(const nsAString &aValue,
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const PRUnichar aEscapeChar,
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nsAString &_escapedString);
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// Needs access to internalAsyncFinalize
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friend class AsyncStatementFinalizer;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(StorageBaseStatementInternal,
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STORAGEBASESTATEMENTINTERNAL_IID)
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#define NS_DECL_STORAGEBASESTATEMENTINTERNAL \
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virtual Connection *getOwner(); \
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virtual int getAsyncStatement(sqlite3_stmt **_stmt); \
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virtual nsresult getAsynchronousStatementData(StatementData &_data); \
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virtual already_AddRefed<mozIStorageBindingParams> newBindingParams( \
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mozIStorageBindingParamsArray *aOwner);
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/**
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* Helper macro to implement the proxying implementations. Because we are
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* implementing methods that are part of mozIStorageBaseStatement and the
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* implementation classes already use NS_DECL_MOZISTORAGEBASESTATEMENT we don't
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* need to provide declaration support.
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*/
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#define MIX_IMPL(_class, _optionalGuard, _method, _declArgs, _invokeArgs) \
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NS_IMETHODIMP _class::_method _declArgs \
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{ \
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_optionalGuard \
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return StorageBaseStatementInternal::_method _invokeArgs; \
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}
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/**
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* Define proxying implementation for the given _class. If a state invariant
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* needs to be checked and an early return possibly performed, pass the clause
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* to use as _optionalGuard.
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*/
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#define MIXIN_IMPL_STORAGEBASESTATEMENTINTERNAL(_class, _optionalGuard) \
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MIX_IMPL(_class, _optionalGuard, \
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NewBindingParamsArray, \
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(mozIStorageBindingParamsArray **_array), \
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(_array)) \
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MIX_IMPL(_class, _optionalGuard, \
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ExecuteAsync, \
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(mozIStorageStatementCallback *aCallback, \
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mozIStoragePendingStatement **_stmt), \
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(aCallback, _stmt)) \
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MIX_IMPL(_class, _optionalGuard, \
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EscapeStringForLIKE, \
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(const nsAString &aValue, const PRUnichar aEscapeChar, \
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nsAString &_escapedString), \
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(aValue, aEscapeChar, _escapedString))
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/**
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* Name-building helper for BIND_GEN_IMPL.
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*/
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#define BIND_NAME_CONCAT(_nameBit, _concatBit) \
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Bind##_nameBit##_concatBit
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/**
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* We have type-specific convenience methods for C++ implementations in
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* 3 different forms; 2 by index, 1 by name. The following macro allows
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* us to avoid having to define repetitive things by hand.
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*
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* Because of limitations of macros and our desire to avoid requiring special
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* permutations for the null and blob cases (whose argument count varies),
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* we require that the argument declarations and corresponding invocation
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* usages are passed in.
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*
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* @param _class
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* The class name.
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* @param _guard
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* The guard clause to inject.
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* @param _declName
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* The argument list (with parens) for the ByName variants.
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* @param _declIndex
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* The argument list (with parens) for the index variants.
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* @param _invArgs
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* The invocation argumment list.
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*/
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#define BIND_GEN_IMPL(_class, _guard, _name, _declName, _declIndex, _invArgs) \
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NS_IMETHODIMP _class::BIND_NAME_CONCAT(_name, ByName) _declName \
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{ \
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_guard \
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mozIStorageBindingParams *params = getParams(); \
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NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \
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return params->BIND_NAME_CONCAT(_name, ByName) _invArgs; \
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} \
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NS_IMETHODIMP _class::BIND_NAME_CONCAT(_name, ByIndex) _declIndex \
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{ \
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_guard \
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mozIStorageBindingParams *params = getParams(); \
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NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \
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return params->BIND_NAME_CONCAT(_name, ByIndex) _invArgs; \
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} \
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NS_IMETHODIMP _class::BIND_NAME_CONCAT(_name, Parameter) _declIndex \
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{ \
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_guard \
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mozIStorageBindingParams *params = getParams(); \
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NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \
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return params->BIND_NAME_CONCAT(_name, ByIndex) _invArgs; \
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}
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/**
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* Implement BindByName/BindByIndex for the given class.
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*
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* @param _class The class name.
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* @param _optionalGuard The guard clause to inject.
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*/
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#define BIND_BASE_IMPLS(_class, _optionalGuard) \
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NS_IMETHODIMP _class::BindByName(const nsACString &aName, \
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nsIVariant *aValue) \
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{ \
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_optionalGuard \
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mozIStorageBindingParams *params = getParams(); \
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NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \
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return params->BindByName(aName, aValue); \
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} \
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NS_IMETHODIMP _class::BindByIndex(uint32_t aIndex, \
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nsIVariant *aValue) \
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{ \
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_optionalGuard \
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mozIStorageBindingParams *params = getParams(); \
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NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY); \
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return params->BindByIndex(aIndex, aValue); \
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}
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/**
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* Define the various Bind*Parameter, Bind*ByIndex, Bind*ByName stubs that just
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* end up proxying to the params object.
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*/
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#define BOILERPLATE_BIND_PROXIES(_class, _optionalGuard) \
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BIND_BASE_IMPLS(_class, _optionalGuard) \
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BIND_GEN_IMPL(_class, _optionalGuard, \
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UTF8String, \
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(const nsACString &aWhere, \
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const nsACString &aValue), \
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(uint32_t aWhere, \
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const nsACString &aValue), \
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(aWhere, aValue)) \
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BIND_GEN_IMPL(_class, _optionalGuard, \
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String, \
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(const nsACString &aWhere, \
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const nsAString &aValue), \
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(uint32_t aWhere, \
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const nsAString &aValue), \
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(aWhere, aValue)) \
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BIND_GEN_IMPL(_class, _optionalGuard, \
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Double, \
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(const nsACString &aWhere, \
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double aValue), \
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(uint32_t aWhere, \
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double aValue), \
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(aWhere, aValue)) \
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BIND_GEN_IMPL(_class, _optionalGuard, \
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Int32, \
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(const nsACString &aWhere, \
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int32_t aValue), \
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(uint32_t aWhere, \
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int32_t aValue), \
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(aWhere, aValue)) \
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BIND_GEN_IMPL(_class, _optionalGuard, \
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Int64, \
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(const nsACString &aWhere, \
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int64_t aValue), \
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(uint32_t aWhere, \
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int64_t aValue), \
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(aWhere, aValue)) \
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BIND_GEN_IMPL(_class, _optionalGuard, \
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Null, \
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(const nsACString &aWhere), \
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(uint32_t aWhere), \
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(aWhere)) \
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BIND_GEN_IMPL(_class, _optionalGuard, \
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Blob, \
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(const nsACString &aWhere, \
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const uint8_t *aValue, \
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uint32_t aValueSize), \
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(uint32_t aWhere, \
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const uint8_t *aValue, \
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uint32_t aValueSize), \
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(aWhere, aValue, aValueSize))
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} // storage
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} // mozilla
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#endif // mozilla_storage_StorageBaseStatementInternal_h_
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