gecko-dev/dom/indexedDB/Key.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Indexed Database.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ben Turner <bent.mozilla@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_dom_indexeddb_key_h__
#define mozilla_dom_indexeddb_key_h__
#include "mozilla/dom/indexedDB/IndexedDatabase.h"
#include "mozIStorageStatement.h"
BEGIN_INDEXEDDB_NAMESPACE
class Key
{
public:
Key()
{
Unset();
}
Key& operator=(const nsAString& aString)
{
SetFromString(aString);
return *this;
}
Key& operator=(PRInt64 aInt)
{
SetFromInteger(aInt);
return *this;
}
bool operator==(const Key& aOther) const
{
NS_ASSERTION(!mBuffer.IsVoid() && !aOther.mBuffer.IsVoid(),
"Don't compare unset keys!");
return mBuffer.Equals(aOther.mBuffer);
}
bool operator!=(const Key& aOther) const
{
NS_ASSERTION(!mBuffer.IsVoid() && !aOther.mBuffer.IsVoid(),
"Don't compare unset keys!");
return !mBuffer.Equals(aOther.mBuffer);
}
bool operator<(const Key& aOther) const
{
NS_ASSERTION(!mBuffer.IsVoid() && !aOther.mBuffer.IsVoid(),
"Don't compare unset keys!");
return Compare(mBuffer, aOther.mBuffer) < 0;
}
bool operator>(const Key& aOther) const
{
NS_ASSERTION(!mBuffer.IsVoid() && !aOther.mBuffer.IsVoid(),
"Don't compare unset keys!");
return Compare(mBuffer, aOther.mBuffer) > 0;
}
bool operator<=(const Key& aOther) const
{
NS_ASSERTION(!mBuffer.IsVoid() && !aOther.mBuffer.IsVoid(),
"Don't compare unset keys!");
return Compare(mBuffer, aOther.mBuffer) <= 0;
}
bool operator>=(const Key& aOther) const
{
NS_ASSERTION(!mBuffer.IsVoid() && !aOther.mBuffer.IsVoid(),
"Don't compare unset keys!");
return Compare(mBuffer, aOther.mBuffer) >= 0;
}
void
Unset()
{
mBuffer.SetIsVoid(true);
}
bool IsUnset() const
{
return mBuffer.IsVoid();
}
bool IsFloat() const
{
return !mBuffer.IsVoid() && mBuffer.First() == eFloat;
}
double ToFloat() const
{
NS_ASSERTION(IsFloat(), "Why'd you call this?");
const unsigned char* pos = BufferStart();
double res = DecodeNumber(pos, BufferEnd());
NS_ASSERTION(pos >= BufferEnd(), "Should consume whole buffer");
return res;
}
void SetFromString(const nsAString& aString)
{
mBuffer.Truncate();
EncodeString(aString, 0);
TrimBuffer();
}
void SetFromInteger(PRInt64 aInt)
{
mBuffer.Truncate();
EncodeNumber(double(aInt), eFloat);
TrimBuffer();
}
nsresult SetFromJSVal(JSContext* aCx,
const jsval aVal)
{
mBuffer.Truncate();
if (JSVAL_IS_NULL(aVal) || JSVAL_IS_VOID(aVal)) {
Unset();
return NS_OK;
}
nsresult rv = EncodeJSVal(aCx, aVal, 0);
if (NS_FAILED(rv)) {
Unset();
return rv;
}
TrimBuffer();
return NS_OK;
}
nsresult ToJSVal(JSContext* aCx,
jsval* aVal) const
{
if (IsUnset()) {
*aVal = JSVAL_VOID;
return NS_OK;
}
const unsigned char* pos = BufferStart();
nsresult rv = DecodeJSVal(pos, BufferEnd(), aCx, 0, aVal);
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(pos >= BufferEnd(),
"Didn't consume whole buffer");
return NS_OK;
}
nsresult AppendArrayItem(JSContext* aCx,
bool aFirst,
const jsval aVal)
{
if (aFirst) {
Unset();
}
nsresult rv = EncodeJSVal(aCx, aVal, aFirst ? eMaxType : 0);
if (NS_FAILED(rv)) {
Unset();
return rv;
}
return NS_OK;
}
void FinishArray()
{
TrimBuffer();
}
const nsCString& GetBuffer() const
{
return mBuffer;
}
nsresult BindToStatement(mozIStorageStatement* aStatement,
const nsACString& aParamName) const
{
nsresult rv = aStatement->BindBlobByName(aParamName,
reinterpret_cast<const PRUint8*>(mBuffer.get()), mBuffer.Length());
return NS_SUCCEEDED(rv) ? NS_OK : NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
}
nsresult SetFromStatement(mozIStorageStatement* aStatement,
PRUint32 aIndex)
{
PRUint8* data;
PRUint32 dataLength = 0;
nsresult rv = aStatement->GetBlob(aIndex, &dataLength, &data);
NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR);
mBuffer.Adopt(
reinterpret_cast<char*>(const_cast<PRUint8*>(data)), dataLength);
return NS_OK;
}
static
PRInt16 CompareKeys(Key& aFirst, Key& aSecond)
{
PRInt32 result = Compare(aFirst.mBuffer, aSecond.mBuffer);
if (result < 0) {
return -1;
}
if (result > 0) {
return 1;
}
return 0;
}
private:
const unsigned char* BufferStart() const
{
return reinterpret_cast<const unsigned char*>(mBuffer.BeginReading());
}
const unsigned char* BufferEnd() const
{
return reinterpret_cast<const unsigned char*>(mBuffer.EndReading());
}
enum {
eTerminator = 0,
eFloat = 1,
eDate = 2,
eString = 3,
eArray = 4,
eMaxType = eArray
};
// Encoding helper. Trims trailing zeros off of mBuffer as a post-processing
// step.
void TrimBuffer()
{
const char* end = mBuffer.EndReading() - 1;
while (!*end) {
--end;
}
mBuffer.Truncate(end + 1 - mBuffer.BeginReading());
}
// Encoding functions. These append the encoded value to the end of mBuffer
nsresult EncodeJSVal(JSContext* aCx, const jsval aVal, PRUint8 aTypeOffset);
void EncodeString(const nsAString& aString, PRUint8 aTypeOffset);
void EncodeNumber(double aFloat, PRUint8 aType);
// Decoding functions. aPos points into mBuffer and is adjusted to point
// past the consumed value.
static nsresult DecodeJSVal(const unsigned char*& aPos,
const unsigned char* aEnd, JSContext* aCx,
PRUint8 aTypeOffset, jsval* aVal);
static void DecodeString(const unsigned char*& aPos,
const unsigned char* aEnd,
nsString& aString);
static double DecodeNumber(const unsigned char*& aPos,
const unsigned char* aEnd);
nsCString mBuffer;
};
END_INDEXEDDB_NAMESPACE
#endif /* mozilla_dom_indexeddb_key_h__ */