importers.cpp

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/* This file is part of KDevelop
    Copyright 2008 David Nolden <[email protected]>
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.
 
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
 
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
 */
 
#include "importers.h"
 
#include "declarationid.h"
#include "duchainpointer.h"
#include "serialization/itemrepository.h"
#include "topducontext.h"
 
namespace KDevelop {
DEFINE_LIST_MEMBER_HASH(ImportersItem, importers, IndexedDUContext)
 
class ImportersItem
{
public:
    ImportersItem()
    {
        initializeAppendedLists();
    }
    ImportersItem(const ImportersItem& rhs, bool dynamic = true) : declaration(rhs.declaration)
    {
        initializeAppendedLists(dynamic);
        copyListsFrom(rhs);
    }
 
    ~ImportersItem()
    {
        freeAppendedLists();
    }
 
    ImportersItem& operator=(const ImportersItem& rhs) = delete;
 
    unsigned int hash() const
    {
        //We only compare the declaration. This allows us implementing a map, although the item-repository
        //originally represents a set.
        return declaration.hash();
    }
 
    unsigned int itemSize() const
    {
        return dynamicSize();
    }
 
    uint classSize() const
    {
        return sizeof(ImportersItem);
    }
 
    DeclarationId declaration;
 
    START_APPENDED_LISTS(ImportersItem);
    APPENDED_LIST_FIRST(ImportersItem, IndexedDUContext, importers);
    END_APPENDED_LISTS(ImportersItem, importers);
};
 
class ImportersRequestItem
{
public:
 
    ImportersRequestItem(const ImportersItem& item) : m_item(item)
    {
    }
    enum {
        AverageSize = 30 //This should be the approximate average size of an Item
    };
 
    unsigned int hash() const
    {
        return m_item.hash();
    }
 
    uint itemSize() const
    {
        return m_item.itemSize();
    }
 
    void createItem(ImportersItem* item) const
    {
        new (item) ImportersItem(m_item, false);
    }
 
    static void destroy(ImportersItem* item, KDevelop::AbstractItemRepository&)
    {
        item->~ImportersItem();
    }
 
    static bool persistent(const ImportersItem* /*item*/)
    {
        return true;
    }
 
    bool equals(const ImportersItem* item) const
    {
        return m_item.declaration == item->declaration;
    }
 
    const ImportersItem& m_item;
};
 
class ImportersPrivate
{
public:
 
    ImportersPrivate() : m_importers(QStringLiteral("Importer Map"))
    {
    }
    //Maps declaration-ids to Importers
    // mutable as things like findIndex are not const
    mutable ItemRepository<ImportersItem, ImportersRequestItem> m_importers;
};
 
Importers::Importers()
    : d_ptr(new ImportersPrivate())
{
}
 
Importers::~Importers() = default;
 
void Importers::addImporter(const DeclarationId& id, const IndexedDUContext& use)
{
    Q_D(Importers);
 
    ImportersItem item;
    item.declaration = id;
    item.importersList().append(use);
    ImportersRequestItem request(item);
 
    uint index = d->m_importers.findIndex(item);
 
    if (index) {
        //Check whether the item is already in the mapped list, else copy the list into the new created item
        const ImportersItem* oldItem = d->m_importers.itemFromIndex(index);
        for (unsigned int a = 0; a < oldItem->importersSize(); ++a) {
            if (oldItem->importers()[a] == use)
                return; //Already there
            item.importersList().append(oldItem->importers()[a]);
        }
 
        d->m_importers.deleteItem(index);
    }
 
    //This inserts the changed item
    d->m_importers.index(request);
}
 
void Importers::removeImporter(const DeclarationId& id, const IndexedDUContext& use)
{
    Q_D(Importers);
 
    ImportersItem item;
    item.declaration = id;
    ImportersRequestItem request(item);
 
    uint index = d->m_importers.findIndex(item);
 
    if (index) {
        //Check whether the item is already in the mapped list, else copy the list into the new created item
        const ImportersItem* oldItem = d->m_importers.itemFromIndex(index);
        for (unsigned int a = 0; a < oldItem->importersSize(); ++a)
            if (!(oldItem->importers()[a] == use))
                item.importersList().append(oldItem->importers()[a]);
 
        d->m_importers.deleteItem(index);
        Q_ASSERT(d->m_importers.findIndex(item) == 0);
 
        //This inserts the changed item
        if (item.importersSize() != 0)
            d->m_importers.index(request);
    }
}
 
KDevVarLengthArray<IndexedDUContext> Importers::importers(const DeclarationId& id) const
{
    Q_D(const Importers);
 
    KDevVarLengthArray<IndexedDUContext> ret;
 
    ImportersItem item;
    item.declaration = id;
    ImportersRequestItem request(item);
 
    uint index = d->m_importers.findIndex(item);
 
    if (index) {
        const ImportersItem* repositoryItem = d->m_importers.itemFromIndex(index);
        FOREACH_FUNCTION(const IndexedDUContext &decl, repositoryItem->importers)
        ret.append(decl);
    }
 
    return ret;
}
 
Importers& Importers::self()
{
    static Importers globalImporters;
    return globalImporters;
}
}