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"
BEGIN_INDEXEDDB_NAMESPACE
class Key
{
public:
enum Type { UNSETKEY, STRINGKEY, INTKEY };
Key()
: mType(UNSETKEY), mInt(0)
{ }
Key(const Key& aOther)
{
*this = aOther;
}
Key& operator=(const Key& aOther)
{
if (this != &aOther) {
mType = aOther.mType;
mString = aOther.mString;
mInt = aOther.mInt;
}
return *this;
}
Key& operator=(Type aType)
{
NS_ASSERTION(aType == UNSETKEY ,
"Use one of the other operators to assign your value!");
mType = aType;
mString.Truncate();
mInt = 0;
return *this;
}
Key& operator=(const nsAString& aString)
{
mType = STRINGKEY;
mString = aString;
mInt = 0;
return *this;
}
Key& operator=(PRInt64 aInt)
{
mType = INTKEY;
mString.Truncate();
mInt = aInt;
return *this;
}
bool operator==(const Key& aOther) const
{
if (mType == aOther.mType) {
switch (mType) {
case UNSETKEY:
return true;
case STRINGKEY:
return mString == aOther.mString;
case INTKEY:
return mInt == aOther.mInt;
default:
NS_NOTREACHED("Unknown type!");
}
}
return false;
}
bool operator!=(const Key& aOther) const
{
return !(*this == aOther);
}
bool operator<(const Key& aOther) const
{
switch (mType) {
case UNSETKEY:
if (aOther.mType == UNSETKEY) {
return false;
}
return true;
case STRINGKEY:
if (aOther.mType == UNSETKEY ||
aOther.mType == INTKEY) {
return false;
}
NS_ASSERTION(aOther.mType == STRINGKEY, "Unknown type!");
return mString < aOther.mString;
case INTKEY:
if (aOther.mType == UNSETKEY) {
return false;
}
if (aOther.mType == STRINGKEY) {
return true;
}
NS_ASSERTION(aOther.mType == INTKEY, "Unknown type!");
return mInt < aOther.mInt;
default:
NS_NOTREACHED("Unknown type!");
}
return false;
}
bool operator>(const Key& aOther) const
{
return !(*this == aOther || *this < aOther);
}
bool operator<=(const Key& aOther) const
{
return (*this == aOther || *this < aOther);
}
bool operator>=(const Key& aOther) const
{
return (*this == aOther || !(*this < aOther));
}
bool IsUnset() const { return mType == UNSETKEY; }
bool IsString() const { return mType == STRINGKEY; }
bool IsInt() const { return mType == INTKEY; }
const nsString& StringValue() const {
NS_ASSERTION(IsString(), "Wrong type!");
return mString;
}
PRInt64 IntValue() const {
NS_ASSERTION(IsInt(), "Wrong type!");
return mInt;
}
nsAString& ToString() {
mType = STRINGKEY;
mInt = 0;
return mString;
}
PRInt64* ToIntPtr() {
mType = INTKEY;
mString.Truncate();
return &mInt;
}
static
JSBool CanBeConstructedFromJSVal(jsval aVal) {
return JSVAL_IS_VOID(aVal) || JSVAL_IS_NULL(aVal) || JSVAL_IS_INT(aVal) ||
JSVAL_IS_DOUBLE(aVal) || JSVAL_IS_STRING(aVal);
}
private:
Type mType;
nsString mString;
PRInt64 mInt;
};
END_INDEXEDDB_NAMESPACE
#endif /* mozilla_dom_indexeddb_key_h__ */