Xapian based fulltext indexing

This cuts into the sync performance by about 40%,
but gives us fast fulltext searching for all local content.

1 files changed, 39 insertions, 0 deletions

diff --git a/common/fulltextindex.h b/common/fulltextindex.h
new file mode 100644
index 0000000..e06f29d
--- /dev/null
+++ b/common/fulltextindex.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include "sink_export.h"
+
+#include <string>
+#include <functional>
+#include <QString>
+#include <memory>
+#include "storage.h"
+#include "log.h"
+
+namespace Xapian {
+    class Database;
+    class WritableDatabase;
+};
+
+class SINK_EXPORT FulltextIndex
+{
+public:
+    FulltextIndex(const QByteArray &resourceInstanceIdentifier, Sink::Storage::DataStore::AccessMode mode = Sink::Storage::DataStore::ReadOnly);
+    ~FulltextIndex();
+
+    void add(const QByteArray &key, const QString &value);
+    void add(const QByteArray &key, const QList<QPair<QString, QString>> &values);
+    void remove(const QByteArray &key);
+
+    void commitTransaction();
+    void abortTransaction();
+
+    QVector<QByteArray> lookup(const QString &key);
+
+private:
+    Xapian::WritableDatabase* writableDatabase();
+    Q_DISABLE_COPY(FulltextIndex);
+    Xapian::Database *mDb{nullptr};
+    QString mName;
+    QString mDbPath;
+    bool mHasTransactionOpen{false};
+};