pjs/string/public/nsSharedString.h

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2000-03-07 04:02:10 +03:00
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Scott Collins <scc@netscape.com>
*/
#ifndef _nsSharedString_h__
#define _nsSharedString_h__
// WORK IN PROGRESS
#include "nsAReadableString.h"
template <class CharT>
class basic_nsSharedString
: public basic_nsAReadableString<CharT>
/*
...
*/
{
private:
~basic_nsSharedString() { }
// You can't sub-class me, or make an instance of me on the stack
// operator delete
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public:
virtual const CharT* GetReadableFragment( nsReadableFragment<CharT>&, nsFragmentRequest, PRUint32 ) const;
virtual
PRUint32
Length() const
{
return mLength;
}
basic_nsSharedString( const CharT* data, size_t length )
: mRefCount(0), mData(data), mLength(length)
{
// nothing else to do here
}
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nsrefcnt
AddRef() const
{
return ++mRefCount;
}
nsrefcnt
Release() const
{
nsrefcnt result = --mRefCount;
if ( !mRefCount )
delete this;
return result;
}
private:
mutable nsrefcnt mRefCount;
const CharT* mData;
size_t mLength;
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};
NS_DEF_STRING_COMPARISONS(basic_nsSharedString<CharT>)
template <class CharT>
const CharT*
basic_nsSharedString<CharT>::GetReadableFragment( nsReadableFragment<CharT>& aFragment, nsFragmentRequest aRequest, PRUint32 anOffset ) const
{
switch ( aRequest )
{
case kFirstFragment:
case kLastFragment:
case kFragmentAt:
aFragment.mEnd = (aFragment.mStart = mData) + mLength;
return aFragment.mStart + anOffset;
case kPrevFragment:
case kNextFragment:
default:
return 0;
}
}
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template <class CharT>
class nsSharedStringPtr
{
public:
// ...
private:
basic_nsSharedString<CharT>* mPtr;
};
template <class CharT>
basic_nsSharedString<CharT>*
new_nsSharedString( const basic_nsAReadableString<CharT>& aReadable )
{
size_t object_size = ((sizeof(basic_nsSharedString<CharT>) + sizeof(CharT) - 1) / sizeof(CharT)) * sizeof(CharT);
size_t string_length = aReadable.Length();
size_t string_size = string_length * sizeof(CharT);
void* object_ptr = operator new(object_size + string_size);
if ( object_ptr )
{
typedef CharT* CharT_ptr;
CharT* string_ptr = CharT_ptr(NS_STATIC_CAST(unsigned char*, object_ptr) + object_size);
copy_string(aReadable.BeginReading(), aReadable.EndReading(), string_ptr);
return new (object_ptr) basic_nsSharedString<CharT>(string_ptr, string_length);
}
return 0;
}
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typedef basic_nsSharedString<PRUnichar> nsSharedString;
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typedef basic_nsSharedString<char> nsSharedCString;
#endif // !defined(_nsSharedString_h__)