зеркало из https://github.com/mozilla/gecko-dev.git
213 строки
9.7 KiB
C++
213 строки
9.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* John Bandhauer <jband@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* The long avoided variant support for xpcom. */
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#ifndef nsVariant_h
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#define nsVariant_h
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#include "nsIVariant.h"
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#include "nsStringFwd.h"
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#include "xpt_struct.h"
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class nsCycleCollectionTraversalCallback;
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/**
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* Map the nsAUTF8String, nsUTF8String classes to the nsACString and
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* nsCString classes respectively for now. These defines need to be removed
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* once Jag lands his nsUTF8String implementation.
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*/
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#define nsAUTF8String nsACString
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#define nsUTF8String nsCString
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#define PromiseFlatUTF8String PromiseFlatCString
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/**
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* nsDiscriminatedUnion is a type that nsIVariant implementors *may* use
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* to hold underlying data. It has no methods. So, its use requires no linkage
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* to the xpcom module.
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*/
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struct nsDiscriminatedUnion
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{
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union {
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PRInt8 mInt8Value;
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PRInt16 mInt16Value;
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PRInt32 mInt32Value;
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PRInt64 mInt64Value;
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PRUint8 mUint8Value;
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PRUint16 mUint16Value;
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PRUint32 mUint32Value;
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PRUint64 mUint64Value;
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float mFloatValue;
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double mDoubleValue;
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bool mBoolValue;
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char mCharValue;
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PRUnichar mWCharValue;
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nsIID mIDValue;
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nsAString* mAStringValue;
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nsAUTF8String* mUTF8StringValue;
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nsACString* mCStringValue;
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struct {
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nsISupports* mInterfaceValue;
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nsIID mInterfaceID;
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} iface;
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struct {
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nsIID mArrayInterfaceID;
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void* mArrayValue;
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PRUint32 mArrayCount;
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PRUint16 mArrayType;
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} array;
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struct {
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char* mStringValue;
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PRUint32 mStringLength;
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} str;
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struct {
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PRUnichar* mWStringValue;
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PRUint32 mWStringLength;
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} wstr;
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} u;
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PRUint16 mType;
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};
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/**
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* nsVariant implements the generic variant support. The xpcom module registers
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* a factory (see NS_VARIANT_CONTRACTID in nsIVariant.idl) that will create
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* these objects. They are created 'empty' and 'writable'.
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*
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* nsIVariant users won't usually need to see this class.
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*
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* This class also has static helper methods that nsIVariant *implementors* can
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* use to help them do all the 'standard' nsIVariant data conversions.
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*/
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class nsVariant : public nsIWritableVariant
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIVARIANT
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NS_DECL_NSIWRITABLEVARIANT
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nsVariant();
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static nsresult Initialize(nsDiscriminatedUnion* data);
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static nsresult Cleanup(nsDiscriminatedUnion* data);
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static nsresult ConvertToInt8(const nsDiscriminatedUnion& data, PRUint8 *_retval);
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static nsresult ConvertToInt16(const nsDiscriminatedUnion& data, PRInt16 *_retval);
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static nsresult ConvertToInt32(const nsDiscriminatedUnion& data, PRInt32 *_retval);
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static nsresult ConvertToInt64(const nsDiscriminatedUnion& data, PRInt64 *_retval);
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static nsresult ConvertToUint8(const nsDiscriminatedUnion& data, PRUint8 *_retval);
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static nsresult ConvertToUint16(const nsDiscriminatedUnion& data, PRUint16 *_retval);
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static nsresult ConvertToUint32(const nsDiscriminatedUnion& data, PRUint32 *_retval);
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static nsresult ConvertToUint64(const nsDiscriminatedUnion& data, PRUint64 *_retval);
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static nsresult ConvertToFloat(const nsDiscriminatedUnion& data, float *_retval);
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static nsresult ConvertToDouble(const nsDiscriminatedUnion& data, double *_retval);
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static nsresult ConvertToBool(const nsDiscriminatedUnion& data, bool *_retval);
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static nsresult ConvertToChar(const nsDiscriminatedUnion& data, char *_retval NS_OUTPARAM);
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static nsresult ConvertToWChar(const nsDiscriminatedUnion& data, PRUnichar *_retval NS_OUTPARAM);
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static nsresult ConvertToID(const nsDiscriminatedUnion& data, nsID * _retval NS_OUTPARAM);
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static nsresult ConvertToAString(const nsDiscriminatedUnion& data, nsAString & _retval NS_OUTPARAM);
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static nsresult ConvertToAUTF8String(const nsDiscriminatedUnion& data, nsAUTF8String & _retval);
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static nsresult ConvertToACString(const nsDiscriminatedUnion& data, nsACString & _retval);
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static nsresult ConvertToString(const nsDiscriminatedUnion& data, char **_retval);
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static nsresult ConvertToWString(const nsDiscriminatedUnion& data, PRUnichar **_retval);
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static nsresult ConvertToISupports(const nsDiscriminatedUnion& data, nsISupports **_retval);
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static nsresult ConvertToInterface(const nsDiscriminatedUnion& data, nsIID * *iid NS_OUTPARAM, void * *iface NS_OUTPARAM);
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static nsresult ConvertToArray(const nsDiscriminatedUnion& data, PRUint16 *type NS_OUTPARAM, nsIID* iid NS_OUTPARAM, PRUint32 *count NS_OUTPARAM, void * *ptr);
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static nsresult ConvertToStringWithSize(const nsDiscriminatedUnion& data, PRUint32 *size NS_OUTPARAM, char **str);
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static nsresult ConvertToWStringWithSize(const nsDiscriminatedUnion& data, PRUint32 *size NS_OUTPARAM, PRUnichar **str);
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static nsresult SetFromVariant(nsDiscriminatedUnion* data, nsIVariant* aValue);
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static nsresult SetFromInt8(nsDiscriminatedUnion* data, PRUint8 aValue);
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static nsresult SetFromInt16(nsDiscriminatedUnion* data, PRInt16 aValue);
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static nsresult SetFromInt32(nsDiscriminatedUnion* data, PRInt32 aValue);
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static nsresult SetFromInt64(nsDiscriminatedUnion* data, PRInt64 aValue);
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static nsresult SetFromUint8(nsDiscriminatedUnion* data, PRUint8 aValue);
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static nsresult SetFromUint16(nsDiscriminatedUnion* data, PRUint16 aValue);
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static nsresult SetFromUint32(nsDiscriminatedUnion* data, PRUint32 aValue);
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static nsresult SetFromUint64(nsDiscriminatedUnion* data, PRUint64 aValue);
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static nsresult SetFromFloat(nsDiscriminatedUnion* data, float aValue);
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static nsresult SetFromDouble(nsDiscriminatedUnion* data, double aValue);
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static nsresult SetFromBool(nsDiscriminatedUnion* data, bool aValue);
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static nsresult SetFromChar(nsDiscriminatedUnion* data, char aValue);
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static nsresult SetFromWChar(nsDiscriminatedUnion* data, PRUnichar aValue);
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static nsresult SetFromID(nsDiscriminatedUnion* data, const nsID & aValue);
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static nsresult SetFromAString(nsDiscriminatedUnion* data, const nsAString & aValue);
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static nsresult SetFromAUTF8String(nsDiscriminatedUnion* data, const nsAUTF8String & aValue);
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static nsresult SetFromACString(nsDiscriminatedUnion* data, const nsACString & aValue);
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static nsresult SetFromString(nsDiscriminatedUnion* data, const char *aValue);
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static nsresult SetFromWString(nsDiscriminatedUnion* data, const PRUnichar *aValue);
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static nsresult SetFromISupports(nsDiscriminatedUnion* data, nsISupports *aValue);
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static nsresult SetFromInterface(nsDiscriminatedUnion* data, const nsIID& iid, nsISupports *aValue);
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static nsresult SetFromArray(nsDiscriminatedUnion* data, PRUint16 type, const nsIID* iid, PRUint32 count, void * aValue);
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static nsresult SetFromStringWithSize(nsDiscriminatedUnion* data, PRUint32 size, const char *aValue);
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static nsresult SetFromWStringWithSize(nsDiscriminatedUnion* data, PRUint32 size, const PRUnichar *aValue);
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static nsresult SetToVoid(nsDiscriminatedUnion* data);
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static nsresult SetToEmpty(nsDiscriminatedUnion* data);
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static nsresult SetToEmptyArray(nsDiscriminatedUnion* data);
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static void Traverse(const nsDiscriminatedUnion& data,
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nsCycleCollectionTraversalCallback &cb);
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private:
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~nsVariant();
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protected:
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nsDiscriminatedUnion mData;
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bool mWritable;
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};
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/**
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* Users of nsIVariant should be using the contractID and not this CID.
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* - see NS_VARIANT_CONTRACTID in nsIVariant.idl.
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*/
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#define NS_VARIANT_CID \
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{ /* 0D6EA1D0-879C-11d5-90EF-0010A4E73D9A */ \
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0xd6ea1d0, \
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0x879c, \
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0x11d5, \
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{0x90, 0xef, 0x0, 0x10, 0xa4, 0xe7, 0x3d, 0x9a}}
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#define NS_VARIANT_CLASSNAME "Variant"
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#endif // nsVariant_h
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