Share more common metadata

1 files changed, 162 insertions, 0 deletions

diff --git a/paludis/repositories/e/e_string_set_key.cc b/paludis/repositories/e/e_string_set_key.cc
new file mode 100644
index 000000000..e7362f38c
--- /dev/null
+++ b/paludis/repositories/e/e_string_set_key.cc
@@ -0,0 +1,162 @@
+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2011 Ciaran McCreesh
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis 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 General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <paludis/repositories/e/e_string_set_key.hh>
+#include <paludis/repositories/e/eapi.hh>
+
+#include <paludis/util/singleton-impl.hh>
+#include <paludis/util/hashes.hh>
+#include <paludis/util/singleton-impl.hh>
+#include <paludis/util/pimp-impl.hh>
+#include <paludis/util/join.hh>
+#include <paludis/util/wrapped_output_iterator.hh>
+#include <paludis/util/tokeniser.hh>
+
+#include <paludis/name.hh>
+#include <paludis/pretty_printer.hh>
+#include <paludis/call_pretty_printer.hh>
+
+#include <tuple>
+#include <unordered_map>
+#include <algorithm>
+
+using namespace paludis;
+using namespace paludis::erepository;
+
+namespace
+{
+    struct EStringSetKey :
+        MetadataCollectionKey<Set<std::string> >
+    {
+        const std::shared_ptr<const Set<std::string> > parsed_value;
+        const std::shared_ptr<const EAPIMetadataVariable> variable;
+        const MetadataKeyType key_type;
+
+        EStringSetKey(
+                const std::shared_ptr<const Set<std::string> > & v,
+                const std::shared_ptr<const EAPIMetadataVariable> & m,
+                const MetadataKeyType t) :
+            parsed_value(v),
+            variable(m),
+            key_type(t)
+        {
+        }
+
+        ~EStringSetKey()
+        {
+        }
+
+        const std::shared_ptr<const Set<std::string> > value() const
+        {
+            return parsed_value;
+        }
+
+        const std::string raw_name() const
+        {
+            return variable->name();
+        }
+
+        const std::string human_name() const
+        {
+            return variable->description();
+        }
+
+        virtual MetadataKeyType type() const
+        {
+            return key_type;
+        }
+
+        virtual const std::string pretty_print_value(
+                const PrettyPrinter & p,
+                const PrettyPrintOptions &) const
+        {
+            return join(value()->begin(), value()->end(), " ", CallPrettyPrinter(p));
+        }
+    };
+
+    typedef std::tuple<std::shared_ptr<const EAPIMetadataVariable>, std::shared_ptr<const Set<std::string> >, MetadataKeyType> EStringSetKeyStoreIndex;
+
+    long hash_set(const std::shared_ptr<const Set<std::string> > & v)
+    {
+        int result(0);
+        for (auto s(v->begin()), s_end(v->end()) ;
+                s != s_end ; ++s)
+            result = (result << 4) ^ Hash<std::string>()(*s);
+        return result;
+    }
+
+    struct EStringSetKeyHash
+    {
+        std::size_t operator() (const EStringSetKeyStoreIndex & p) const
+        {
+            return
+                Hash<std::string>()(std::get<0>(p)->description()) ^
+                std::get<0>(p)->flat_list_index() ^
+                Hash<std::string>()(std::get<0>(p)->name()) ^
+                hash_set(std::get<1>(p)) ^
+                static_cast<int>(std::get<2>(p));
+        }
+    };
+
+    struct EStringSetKeyStoreCompare
+    {
+        bool operator() (const EStringSetKeyStoreIndex & a, const EStringSetKeyStoreIndex & b) const
+        {
+            return std::get<0>(a) == std::get<0>(b) && std::get<2>(a) == std::get<2>(b) &&
+                std::get<1>(a)->size() == std::get<1>(b)->size() &&
+                std::get<1>(a)->end() == std::mismatch(std::get<1>(a)->begin(), std::get<1>(a)->end(), std::get<1>(b)->begin()).first;
+        }
+    };
+}
+
+namespace paludis
+{
+    template <>
+    struct Imp<EStringSetKeyStore>
+    {
+        mutable Mutex mutex;
+        mutable std::unordered_map<EStringSetKeyStoreIndex, std::shared_ptr<const EStringSetKey>, EStringSetKeyHash, EStringSetKeyStoreCompare> store;
+    };
+}
+
+EStringSetKeyStore::EStringSetKeyStore() :
+    Pimp<EStringSetKeyStore>()
+{
+}
+
+EStringSetKeyStore::~EStringSetKeyStore() = default;
+
+const std::shared_ptr<const MetadataCollectionKey<Set<std::string> > >
+EStringSetKeyStore::fetch(
+        const std::shared_ptr<const EAPIMetadataVariable> & v,
+        const std::string & s,
+        const MetadataKeyType t) const
+{
+    Lock lock(_imp->mutex);
+
+    auto k(std::make_shared<Set<std::string> >());
+    tokenise_whitespace(s, k->inserter());
+
+    EStringSetKeyStoreIndex x(v, k, t);
+    auto i(_imp->store.find(x));
+    if (i == _imp->store.end())
+        i = _imp->store.insert(std::make_pair(x, std::make_shared<const EStringSetKey>(k, v, t))).first;
+    return i->second;
+}
+