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/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* John Bandhauer <jband@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 ***** */
/* The long avoided variant support for xpcom. */
#include "nsIVariant.h"
#include "nsStringFwd.h"
#include "xpt_struct.h"
/**
* Map the nsAUTF8String, nsUTF8String classes to the nsACString and
* nsCString classes respectively for now. These defines need to be removed
* once Jag lands his nsUTF8String implementation.
*/
#define nsAUTF8String nsACString
#define nsUTF8String nsCString
#define PromiseFlatUTF8String PromiseFlatCString
/**
* nsDiscriminatedUnion is a type that nsIVariant implementors *may* use
* to hold underlying data. It has no methods. So, its use requires no linkage
* to the xpcom module.
*/
struct nsDiscriminatedUnion
{
union {
PRInt8 mInt8Value;
PRInt16 mInt16Value;
PRInt32 mInt32Value;
PRInt64 mInt64Value;
PRUint8 mUint8Value;
PRUint16 mUint16Value;
PRUint32 mUint32Value;
PRUint64 mUint64Value;
float mFloatValue;
double mDoubleValue;
PRBool mBoolValue;
char mCharValue;
PRUnichar mWCharValue;
nsIID mIDValue;
nsAString* mAStringValue;
nsAUTF8String* mUTF8StringValue;
nsACString* mCStringValue;
struct {
nsISupports* mInterfaceValue;
nsIID mInterfaceID;
} iface;
struct {
nsIID mArrayInterfaceID;
void* mArrayValue;
PRUint32 mArrayCount;
PRUint16 mArrayType;
} array;
struct {
char* mStringValue;
PRUint32 mStringLength;
} str;
struct {
PRUnichar* mWStringValue;
PRUint32 mWStringLength;
} wstr;
} u;
PRUint16 mType;
};
/**
* nsVariant implements the generic variant support. The xpcom module registers
* a factory (see NS_VARIANT_CONTRACTID in nsIVariant.idl) that will create
* these objects. They are created 'empty' and 'writable'.
*
* nsIVariant users won't usually need to see this class.
*
* This class also has static helper methods that nsIVariant *implementors* can
* use to help them do all the 'standard' nsIVariant data conversions.
*/
class NS_COM nsVariant : public nsIWritableVariant
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIVARIANT
NS_DECL_NSIWRITABLEVARIANT
nsVariant();
static nsresult Initialize(nsDiscriminatedUnion* data);
static nsresult Cleanup(nsDiscriminatedUnion* data);
static nsresult ConvertToInt8(const nsDiscriminatedUnion& data, PRUint8 *_retval);
static nsresult ConvertToInt16(const nsDiscriminatedUnion& data, PRInt16 *_retval);
static nsresult ConvertToInt32(const nsDiscriminatedUnion& data, PRInt32 *_retval);
static nsresult ConvertToInt64(const nsDiscriminatedUnion& data, PRInt64 *_retval);
static nsresult ConvertToUint8(const nsDiscriminatedUnion& data, PRUint8 *_retval);
static nsresult ConvertToUint16(const nsDiscriminatedUnion& data, PRUint16 *_retval);
static nsresult ConvertToUint32(const nsDiscriminatedUnion& data, PRUint32 *_retval);
static nsresult ConvertToUint64(const nsDiscriminatedUnion& data, PRUint64 *_retval);
static nsresult ConvertToFloat(const nsDiscriminatedUnion& data, float *_retval);
static nsresult ConvertToDouble(const nsDiscriminatedUnion& data, double *_retval);
static nsresult ConvertToBool(const nsDiscriminatedUnion& data, PRBool *_retval);
static nsresult ConvertToChar(const nsDiscriminatedUnion& data, char *_retval);
static nsresult ConvertToWChar(const nsDiscriminatedUnion& data, PRUnichar *_retval);
static nsresult ConvertToID(const nsDiscriminatedUnion& data, nsID * _retval);
static nsresult ConvertToAString(const nsDiscriminatedUnion& data, nsAString & _retval);
static nsresult ConvertToAUTF8String(const nsDiscriminatedUnion& data, nsAUTF8String & _retval);
static nsresult ConvertToACString(const nsDiscriminatedUnion& data, nsACString & _retval);
static nsresult ConvertToString(const nsDiscriminatedUnion& data, char **_retval);
static nsresult ConvertToWString(const nsDiscriminatedUnion& data, PRUnichar **_retval);
static nsresult ConvertToISupports(const nsDiscriminatedUnion& data, nsISupports **_retval);
static nsresult ConvertToInterface(const nsDiscriminatedUnion& data, nsIID * *iid, void * *iface);
static nsresult ConvertToArray(const nsDiscriminatedUnion& data, PRUint16 *type, nsIID* iid, PRUint32 *count, void * *ptr);
static nsresult ConvertToStringWithSize(const nsDiscriminatedUnion& data, PRUint32 *size, char **str);
static nsresult ConvertToWStringWithSize(const nsDiscriminatedUnion& data, PRUint32 *size, PRUnichar **str);
static nsresult SetFromVariant(nsDiscriminatedUnion* data, nsIVariant* aValue);
static nsresult SetFromInt8(nsDiscriminatedUnion* data, PRUint8 aValue);
static nsresult SetFromInt16(nsDiscriminatedUnion* data, PRInt16 aValue);
static nsresult SetFromInt32(nsDiscriminatedUnion* data, PRInt32 aValue);
static nsresult SetFromInt64(nsDiscriminatedUnion* data, PRInt64 aValue);
static nsresult SetFromUint8(nsDiscriminatedUnion* data, PRUint8 aValue);
static nsresult SetFromUint16(nsDiscriminatedUnion* data, PRUint16 aValue);
static nsresult SetFromUint32(nsDiscriminatedUnion* data, PRUint32 aValue);
static nsresult SetFromUint64(nsDiscriminatedUnion* data, PRUint64 aValue);
static nsresult SetFromFloat(nsDiscriminatedUnion* data, float aValue);
static nsresult SetFromDouble(nsDiscriminatedUnion* data, double aValue);
static nsresult SetFromBool(nsDiscriminatedUnion* data, PRBool aValue);
static nsresult SetFromChar(nsDiscriminatedUnion* data, char aValue);
static nsresult SetFromWChar(nsDiscriminatedUnion* data, PRUnichar aValue);
static nsresult SetFromID(nsDiscriminatedUnion* data, const nsID & aValue);
static nsresult SetFromAString(nsDiscriminatedUnion* data, const nsAString & aValue);
static nsresult SetFromAUTF8String(nsDiscriminatedUnion* data, const nsAUTF8String & aValue);
static nsresult SetFromACString(nsDiscriminatedUnion* data, const nsACString & aValue);
static nsresult SetFromString(nsDiscriminatedUnion* data, const char *aValue);
static nsresult SetFromWString(nsDiscriminatedUnion* data, const PRUnichar *aValue);
static nsresult SetFromISupports(nsDiscriminatedUnion* data, nsISupports *aValue);
static nsresult SetFromInterface(nsDiscriminatedUnion* data, const nsIID& iid, nsISupports *aValue);
static nsresult SetFromArray(nsDiscriminatedUnion* data, PRUint16 type, const nsIID* iid, PRUint32 count, void * aValue);
static nsresult SetFromStringWithSize(nsDiscriminatedUnion* data, PRUint32 size, const char *aValue);
static nsresult SetFromWStringWithSize(nsDiscriminatedUnion* data, PRUint32 size, const PRUnichar *aValue);
static nsresult SetToVoid(nsDiscriminatedUnion* data);
static nsresult SetToEmpty(nsDiscriminatedUnion* data);
static nsresult SetToEmptyArray(nsDiscriminatedUnion* data);
private:
~nsVariant();
protected:
nsDiscriminatedUnion mData;
PRBool mWritable;
};
/**
* Users of nsIVariant should be using the contractID and not this CID.
* - see NS_VARIANT_CONTRACTID in nsIVariant.idl.
*/
#define NS_VARIANT_CID \
{ /* 0D6EA1D0-879C-11d5-90EF-0010A4E73D9A */ \
0xd6ea1d0, \
0x879c, \
0x11d5, \
{0x90, 0xef, 0x0, 0x10, 0xa4, 0xe7, 0x3d, 0x9a}}
#define NS_VARIANT_CLASSNAME "Variant"
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