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/*
SPDX-FileCopyrightText: 2008 David Nolden <david.nolden.kdevelop@art-master.de>
SPDX-License-Identifier: LGPL-2.0-only
*/
#ifndef KDEVPLATFORM_STRINGREPOSITORY_H
#define KDEVPLATFORM_STRINGREPOSITORY_H
#include <QString>
#include "itemrepository.h"
#include "indexedstring.h"
namespace Repositories {
using namespace KDevelop;
struct StringData
{
unsigned short length;
StringData& operator=(const StringData& rhs) = delete;
unsigned int itemSize() const
{
return sizeof(StringData) + length;
}
unsigned int hash() const
{
IndexedString::RunningHash running;
const char* str = reinterpret_cast<const char*>(this) + sizeof(StringData);
for (int a = length - 1; a >= 0; --a) {
running.append(*str);
++str;
}
return running.hash;
}
};
struct StringRepositoryItemRequest
{
//The text is supposed to be utf8 encoded
StringRepositoryItemRequest(const char* text, unsigned int hash, unsigned short length) : m_hash(hash)
, m_length(length)
, m_text(text)
{
}
enum {
AverageSize = 10 //This should be the approximate average size of an Item
};
using HashType = unsigned int;
//Should return the hash-value associated with this request(For example the hash of a string)
HashType hash() const
{
return m_hash;
}
//Should return the size of an item created with createItem
uint itemSize() const
{
return sizeof(StringData) + m_length;
}
//Should create an item where the information of the requested item is permanently stored. The pointer
//@param item equals an allocated range with the size of itemSize().
void createItem(StringData* item) const
{
item->length = m_length;
void* itemText = reinterpret_cast<void*>(item + 1);
memcpy(itemText, m_text, m_length);
}
static void destroy(StringData*, KDevelop::AbstractItemRepository&)
{
}
static bool persistent(const StringData*)
{
//Reference-counting not supported in the normal string repository
return true;
}
//Should return whether the here requested item equals the given item
bool equals(const StringData* item) const
{
return item->length == m_length && (memcmp(++item, m_text, m_length) == 0);
}
unsigned int m_hash;
unsigned short m_length;
const char* m_text;
};
using StringRepository = ItemRepository<StringData, StringRepositoryItemRequest, false>;
///@param item must be valid(nonzero)
inline QString stringFromItem(const StringData* item)
{
const unsigned short* textPos = ( unsigned short* )(item + 1);
return QString::fromUtf8(reinterpret_cast<const char*>(textPos), item->length);
}
inline QByteArray arrayFromItem(const StringData* item)
{
const unsigned short* textPos = ( unsigned short* )(item + 1);
return QByteArray(reinterpret_cast<const char*>(textPos), item->length);
}
}
#endif
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