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#include "DataSource/DataSourceItemMergeHelper.h"
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#include <DataSource/DataSourceItem.h>
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namespace
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{
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/**
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* Finds in a tree an item similar to the item passed in parameter
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* @param item the item for which to find a similar item
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* @param root the root item of the tree
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* @return the similar item if found, nullptr otherwise
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*/
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DataSourceItem* findSimilarItem(const DataSourceItem& item,
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const DataSourceItem& root)
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{
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// An item is considered similar to the another item if:
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// - the items are both nodes AND
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// - the names of the items are identical
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if(item.type() != DataSourceItemType::NODE) { return nullptr; }
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auto similar_item = std::find_if(
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std::cbegin(root), std::cend(root), [&item](const auto& child) {
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return child->type() == DataSourceItemType::NODE &&
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QString::compare(child->name(), item.name(),
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Qt::CaseInsensitive) == 0;
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});
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if(similar_item == std::cend(root)) return nullptr;
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return similar_item->get();
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}
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} // namespace
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void DataSourceItemMergeHelper::merge(const DataSourceItem& source,
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DataSourceItem& dest)
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{
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// Checks if the source item can be merged into the destination item (i.e.
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// there is a child item similar to the source item)
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if(auto subItem = findSimilarItem(source, dest))
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{
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// If there is an item similar to the source item, applies the merge
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// recursively
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std::for_each(std::cbegin(source), std::cend(source),
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[subItem](auto& child) { merge(*child.get(), *subItem); });
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}
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else
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{
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// If no item is similar to the source item, the item is copied as the child
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// of the destination item
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if(std::cend(dest) == std::find_if(std::cbegin(dest), std::cend(dest),
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[&source](const auto& child)
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{return source.type() != DataSourceItemType::NODE && source.name()==child->name() && source.data()==child->data();}))
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dest.appendChild(source.clone());
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}
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}
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