Removes generics from SPARQL implementation

lib/src/sparql/dataset.rs

@@ -3,47 +3,46 @@ use crate::sparql::EvaluationError;
 use crate::store::numeric_encoder::{
     EncodedQuad, EncodedTerm, ReadEncoder, StrContainer, StrEncodingAware, StrHash, StrLookup,
 };
+use crate::store::storage::Storage;
 use crate::store::ReadableEncodedStore;
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::iter::{empty, once, Once};
 
-pub(crate) struct DatasetView<S: ReadableEncodedStore> {
-    store: S,
+pub(crate) struct DatasetView {
+    storage: Storage,
     extra: RefCell<HashMap<StrHash, String>>,
     dataset: EncodedDatasetSpec,
 }
 
-impl<S: ReadableEncodedStore> DatasetView<S> {
-    pub fn new(store: S, dataset: &QueryDataset) -> Result<Self, EvaluationError> {
+impl DatasetView {
+    pub fn new(storage: Storage, dataset: &QueryDataset) -> Result<Self, EvaluationError> {
         let dataset = EncodedDatasetSpec {
             default: dataset
                 .default_graph_graphs()
                 .map(|graphs| {
                     graphs
                         .iter()
-                        .flat_map(|g| store.get_encoded_graph_name(g.as_ref()).transpose())
+                        .flat_map(|g| storage.get_encoded_graph_name(g.as_ref()).transpose())
                         .collect::<Result<Vec<_>, _>>()
                 })
-                .transpose()
-                .map_err(|e| e.into())?,
+                .transpose()?,
             named: dataset
                 .available_named_graphs()
                 .map(|graphs| {
                     graphs
                         .iter()
                         .flat_map(|g| {
-                            store
+                            storage
                                 .get_encoded_named_or_blank_node(g.as_ref())
                                 .transpose()
                         })
                         .collect::<Result<Vec<_>, _>>()
                 })
-                .transpose()
-                .map_err(|e| e.into())?,
+                .transpose()?,
         };
         Ok(Self {
-            store,
+            storage,
             extra: RefCell::new(HashMap::default()),
             dataset,
         })
@@ -56,25 +55,23 @@ impl<S: ReadableEncodedStore> DatasetView<S> {
         object: Option<EncodedTerm>,
         graph_name: Option<EncodedTerm>,
     ) -> impl Iterator<Item = Result<EncodedQuad, EvaluationError>> + 'static {
-        self.store
-            .encoded_quads_for_pattern(subject, predicate, object, graph_name)
+        self.storage
+            .quads_for_pattern(subject, predicate, object, graph_name)
             .map(|t| t.map_err(|e| e.into()))
     }
 }
 
-impl<S: ReadableEncodedStore> StrEncodingAware for DatasetView<S> {
+impl StrEncodingAware for DatasetView {
     type Error = EvaluationError;
 }
 
-impl<S: ReadableEncodedStore> StrLookup for DatasetView<S> {
+impl StrLookup for DatasetView {
     fn get_str(&self, id: StrHash) -> Result<Option<String>, EvaluationError> {
-        self.extra
-            .borrow()
-            .get(&id)
-            .cloned()
-            .map(Ok)
-            .or_else(|| self.store.get_str(id).map_err(|e| e.into()).transpose())
-            .transpose()
+        Ok(if let Some(value) = self.extra.borrow().get(&id) {
+            Some(value.clone())
+        } else {
+            self.storage.get_str(id)?
+        })
     }
 
     fn get_str_id(&self, value: &str) -> Result<Option<StrHash>, EvaluationError> {
@@ -82,12 +79,12 @@ impl<S: ReadableEncodedStore> StrLookup for DatasetView<S> {
         Ok(if self.extra.borrow().contains_key(&id) {
             Some(id)
         } else {
-            self.store.get_str_id(value).map_err(|e| e.into())?
+            self.storage.get_str_id(value)?
         })
     }
 }
 
-impl<S: ReadableEncodedStore + 'static> ReadableEncodedStore for DatasetView<S> {
+impl ReadableEncodedStore for DatasetView {
     type QuadsIter = Box<dyn Iterator<Item = Result<EncodedQuad, EvaluationError>>>;
     type GraphsIter = Once<Result<EncodedTerm, EvaluationError>>;
 
@@ -198,9 +195,9 @@ impl<S: ReadableEncodedStore + 'static> ReadableEncodedStore for DatasetView<S>
     }
 }
 
-impl<'a, S: ReadableEncodedStore> StrContainer for &'a DatasetView<S> {
+impl StrContainer for DatasetView {
     fn insert_str(&self, value: &str) -> Result<StrHash, EvaluationError> {
-        if let Some(hash) = self.store.get_str_id(value).map_err(|e| e.into())? {
+        if let Some(hash) = self.storage.get_str_id(value)? {
             Ok(hash)
         } else {
             let hash = StrHash::new(value);

lib/src/sparql/eval.rs

@@ -3,6 +3,7 @@ use crate::model::xsd::*;
 use crate::model::Triple;
 use crate::model::{BlankNode, LiteralRef, NamedNodeRef};
 use crate::sparql::algebra::{Query, QueryDataset};
+use crate::sparql::dataset::DatasetView;
 use crate::sparql::error::EvaluationError;
 use crate::sparql::model::*;
 use crate::sparql::plan::*;
@@ -32,30 +33,17 @@ const REGEX_SIZE_LIMIT: usize = 1_000_000;
 
 type EncodedTuplesIterator = Box<dyn Iterator<Item = Result<EncodedTuple, EvaluationError>>>;
 
-pub(crate) struct SimpleEvaluator<S> {
-    dataset: Rc<S>,
+#[derive(Clone)]
+pub(crate) struct SimpleEvaluator {
+    dataset: Rc<DatasetView>,
     base_iri: Option<Rc<Iri<String>>>,
     now: DateTime,
     service_handler: Rc<dyn ServiceHandler<Error = EvaluationError>>,
 }
 
-impl<S> Clone for SimpleEvaluator<S> {
-    fn clone(&self) -> Self {
-        Self {
-            dataset: self.dataset.clone(),
-            base_iri: self.base_iri.clone(),
-            now: self.now,
-            service_handler: self.service_handler.clone(),
-        }
-    }
-}
-
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> SimpleEvaluator<S>
-where
-    for<'a> &'a S: StrContainer,
-{
+impl SimpleEvaluator {
     pub fn new(
-        dataset: Rc<S>,
+        dataset: Rc<DatasetView>,
         base_iri: Option<Rc<Iri<String>>>,
         service_handler: Rc<dyn ServiceHandler<Error = EvaluationError>>,
     ) -> Self {
@@ -1829,7 +1817,7 @@ where
                 put_variable_value(
                     variable,
                     &variables,
-                    encoder.encode_term(term.as_ref()).map_err(|e| e.into())?,
+                    encoder.encode_term(term.as_ref())?,
                     &mut encoded_terms,
                 )
             }
@@ -2469,17 +2457,14 @@ impl Iterator for AntiJoinIterator {
     }
 }
 
-struct LeftJoinIterator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct LeftJoinIterator {
+    eval: SimpleEvaluator,
     right_plan: Rc<PlanNode>,
     left_iter: EncodedTuplesIterator,
     current_right: EncodedTuplesIterator,
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Iterator for LeftJoinIterator<S>
-where
-    for<'a> &'a S: StrContainer,
-{
+impl Iterator for LeftJoinIterator {
     type Item = Result<EncodedTuple, EvaluationError>;
 
     fn next(&mut self) -> Option<Result<EncodedTuple, EvaluationError>> {
@@ -2500,8 +2485,8 @@ where
     }
 }
 
-struct BadLeftJoinIterator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct BadLeftJoinIterator {
+    eval: SimpleEvaluator,
     right_plan: Rc<PlanNode>,
     left_iter: EncodedTuplesIterator,
     current_left: Option<EncodedTuple>,
@@ -2509,10 +2494,7 @@ struct BadLeftJoinIterator<S: ReadableEncodedStore + 'static> {
     problem_vars: Rc<Vec<usize>>,
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Iterator for BadLeftJoinIterator<S>
-where
-    for<'a> &'a S: StrContainer,
-{
+impl Iterator for BadLeftJoinIterator {
     type Item = Result<EncodedTuple, EvaluationError>;
 
     fn next(&mut self) -> Option<Result<EncodedTuple, EvaluationError>> {
@@ -2555,18 +2537,15 @@ where
     }
 }
 
-struct UnionIterator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct UnionIterator {
+    eval: SimpleEvaluator,
     plans: Vec<Rc<PlanNode>>,
     input: EncodedTuple,
     current_iterator: EncodedTuplesIterator,
     current_plan: usize,
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Iterator for UnionIterator<S>
-where
-    for<'a> &'a S: StrContainer,
-{
+impl Iterator for UnionIterator {
     type Item = Result<EncodedTuple, EvaluationError>;
 
     fn next(&mut self) -> Option<Result<EncodedTuple, EvaluationError>> {
@@ -2585,15 +2564,15 @@ where
     }
 }
 
-struct ConstructIterator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct ConstructIterator {
+    eval: SimpleEvaluator,
     iter: EncodedTuplesIterator,
     template: Vec<TripleTemplate>,
     buffered_results: Vec<Result<Triple, EvaluationError>>,
     bnodes: Vec<EncodedTerm>,
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Iterator for ConstructIterator<S> {
+impl Iterator for ConstructIterator {
     type Item = Result<Triple, EvaluationError>;
 
     fn next(&mut self) -> Option<Result<Triple, EvaluationError>> {
@@ -2660,13 +2639,13 @@ fn decode_triple<D: Decoder>(
     ))
 }
 
-struct DescribeIterator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct DescribeIterator {
+    eval: SimpleEvaluator,
     iter: EncodedTuplesIterator,
     quads: Box<dyn Iterator<Item = Result<EncodedQuad, EvaluationError>>>,
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Iterator for DescribeIterator<S> {
+impl Iterator for DescribeIterator {
     type Item = Result<Triple, EvaluationError>;
 
     fn next(&mut self) -> Option<Result<Triple, EvaluationError>> {
@@ -2976,21 +2955,18 @@ impl Accumulator for AvgAccumulator {
 }
 
 #[allow(clippy::option_option)]
-struct MinAccumulator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct MinAccumulator {
+    eval: SimpleEvaluator,
     min: Option<Option<EncodedTerm>>,
 }
 
-impl<S: ReadableEncodedStore + 'static> MinAccumulator<S> {
-    fn new(eval: SimpleEvaluator<S>) -> Self {
+impl MinAccumulator {
+    fn new(eval: SimpleEvaluator) -> Self {
         Self { eval, min: None }
     }
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Accumulator for MinAccumulator<S>
-where
-    for<'a> &'a S: StrContainer,
-{
+impl Accumulator for MinAccumulator {
     fn add(&mut self, element: Option<EncodedTerm>) {
         if let Some(min) = self.min {
             if self.eval.cmp_terms(element, min) == Ordering::Less {
@@ -3007,21 +2983,18 @@ where
 }
 
 #[allow(clippy::option_option)]
-struct MaxAccumulator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct MaxAccumulator {
+    eval: SimpleEvaluator,
     max: Option<Option<EncodedTerm>>,
 }
 
-impl<S: ReadableEncodedStore + 'static> MaxAccumulator<S> {
-    fn new(eval: SimpleEvaluator<S>) -> Self {
+impl MaxAccumulator {
+    fn new(eval: SimpleEvaluator) -> Self {
         Self { eval, max: None }
     }
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Accumulator for MaxAccumulator<S>
-where
-    for<'a> &'a S: StrContainer,
-{
+impl Accumulator for MaxAccumulator {
     fn add(&mut self, element: Option<EncodedTerm>) {
         if let Some(max) = self.max {
             if self.eval.cmp_terms(element, max) == Ordering::Greater {
@@ -3061,15 +3034,15 @@ impl Accumulator for SampleAccumulator {
 }
 
 #[allow(clippy::option_option)]
-struct GroupConcatAccumulator<S: ReadableEncodedStore + 'static> {
-    eval: SimpleEvaluator<S>,
+struct GroupConcatAccumulator {
+    eval: SimpleEvaluator,
     concat: Option<String>,
     language: Option<Option<SmallStringOrId>>,
     separator: Rc<String>,
 }
 
-impl<S: ReadableEncodedStore + 'static> GroupConcatAccumulator<S> {
-    fn new(eval: SimpleEvaluator<S>, separator: Rc<String>) -> Self {
+impl GroupConcatAccumulator {
+    fn new(eval: SimpleEvaluator, separator: Rc<String>) -> Self {
         Self {
             eval,
             concat: Some("".to_owned()),
@@ -3079,11 +3052,7 @@ impl<S: ReadableEncodedStore + 'static> GroupConcatAccumulator<S> {
     }
 }
 
-impl<S: ReadableEncodedStore<Error = EvaluationError> + 'static> Accumulator
-    for GroupConcatAccumulator<S>
-where
-    for<'a> &'a S: StrContainer,
-{
+impl Accumulator for GroupConcatAccumulator {
     fn add(&mut self, element: Option<EncodedTerm>) {
         if let Some(concat) = self.concat.as_mut() {
             if let Some(element) = element {

lib/src/sparql/mod.rs

@@ -30,20 +30,18 @@ use crate::sparql::plan_builder::PlanBuilder;
 pub use crate::sparql::service::ServiceHandler;
 use crate::sparql::service::{EmptyServiceHandler, ErrorConversionServiceHandler};
 use crate::sparql::update::SimpleUpdateEvaluator;
-use crate::store::numeric_encoder::StrContainer;
-use crate::store::{ReadableEncodedStore, StoreOrParseError, WritableEncodedStore};
+use crate::store::storage::Storage;
 pub use spargebra::ParseError;
 use std::convert::TryInto;
-use std::io;
 use std::rc::Rc;
 
-pub(crate) fn evaluate_query<R: ReadableEncodedStore + 'static>(
-    store: R,
+pub(crate) fn evaluate_query(
+    storage: Storage,
     query: impl TryInto<Query, Error = impl Into<EvaluationError>>,
     options: QueryOptions,
 ) -> Result<QueryResults, EvaluationError> {
     let query = query.try_into().map_err(|e| e.into())?;
-    let dataset = DatasetView::new(store, &query.dataset)?;
+    let dataset = DatasetView::new(storage, &query.dataset)?;
     match query.inner {
         spargebra::Query::Select {
             pattern, base_iri, ..
@@ -179,18 +177,11 @@ impl From<QueryOptions> for UpdateOptions {
     }
 }
 
-pub(crate) fn evaluate_update<
-    R: ReadableEncodedStore + Clone + 'static,
-    W: StrContainer + WritableEncodedStore,
->(
-    read: R,
-    write: &mut W,
+pub(crate) fn evaluate_update(
+    storage: &Storage,
     update: Update,
     options: UpdateOptions,
-) -> Result<(), EvaluationError>
-where
-    io::Error: From<StoreOrParseError<W::Error>>,
-{
-    SimpleUpdateEvaluator::new(read, write, update.inner.base_iri.map(Rc::new), options)
+) -> Result<(), EvaluationError> {
+    SimpleUpdateEvaluator::new(storage, update.inner.base_iri.map(Rc::new), options)
         .eval_all(&update.inner.operations, &update.using_datasets)
 }

lib/src/sparql/plan_builder.rs

@@ -1,4 +1,5 @@
 use crate::model::{LiteralRef, NamedNodeRef};
+use crate::sparql::dataset::DatasetView;
 use crate::sparql::error::EvaluationError;
 use crate::sparql::model::Variable as OxVariable;
 use crate::sparql::plan::*;
@@ -9,17 +10,17 @@ use spargebra::term::*;
 use std::collections::{BTreeSet, HashSet};
 use std::rc::Rc;
 
-pub(crate) struct PlanBuilder<E: WriteEncoder> {
-    encoder: E,
+pub(crate) struct PlanBuilder<'a> {
+    dataset: &'a DatasetView,
 }
 
-impl<E: WriteEncoder<Error = EvaluationError>> PlanBuilder<E> {
+impl<'a> PlanBuilder<'a> {
     pub fn build(
-        encoder: E,
+        dataset: &'a DatasetView,
         pattern: &GraphPattern,
     ) -> Result<(PlanNode, Vec<Variable>), EvaluationError> {
         let mut variables = Vec::default();
-        let plan = PlanBuilder { encoder }.build_for_graph_pattern(
+        let plan = PlanBuilder { dataset }.build_for_graph_pattern(
             pattern,
             &mut variables,
             PatternValue::Constant(EncodedTerm::DefaultGraph),
@@ -28,11 +29,11 @@ impl<E: WriteEncoder<Error = EvaluationError>> PlanBuilder<E> {
     }
 
     pub fn build_graph_template(
-        encoder: E,
+        dataset: &'a DatasetView,
         template: &[TriplePattern],
         mut variables: Vec<Variable>,
     ) -> Result<Vec<TripleTemplate>, EvaluationError> {
-        PlanBuilder { encoder }.build_for_graph_template(template, &mut variables)
+        PlanBuilder { dataset }.build_for_graph_template(template, &mut variables)
     }
 
     fn build_for_graph_pattern(
@@ -1047,12 +1048,12 @@ impl<E: WriteEncoder<Error = EvaluationError>> PlanBuilder<E> {
     }
 
     fn build_named_node(&mut self, node: &NamedNode) -> Result<EncodedTerm, EvaluationError> {
-        self.encoder
+        self.dataset
             .encode_named_node(NamedNodeRef::new_unchecked(node.iri.as_str()))
     }
 
     fn build_literal(&mut self, literal: &Literal) -> Result<EncodedTerm, EvaluationError> {
-        self.encoder.encode_literal(match literal {
+        self.dataset.encode_literal(match literal {
             Literal::Simple { value } => LiteralRef::new_simple_literal(value),
             Literal::LanguageTaggedString { value, language } => {
                 LiteralRef::new_language_tagged_literal_unchecked(value, language.as_str())

lib/src/sparql/update.rs

@@ -8,10 +8,11 @@ use crate::sparql::http::Client;
 use crate::sparql::plan::EncodedTuple;
 use crate::sparql::plan_builder::PlanBuilder;
 use crate::sparql::{EvaluationError, UpdateOptions};
+use crate::store::load_graph;
 use crate::store::numeric_encoder::{
-    EncodedQuad, EncodedTerm, ReadEncoder, StrContainer, StrLookup, WriteEncoder,
+    EncodedQuad, EncodedTerm, ReadEncoder, StrLookup, WriteEncoder,
 };
-use crate::store::{load_graph, ReadableEncodedStore, StoreOrParseError, WritableEncodedStore};
+use crate::store::storage::Storage;
 use http::header::{ACCEPT, CONTENT_TYPE, USER_AGENT};
 use http::{Method, Request, StatusCode};
 use oxiri::Iri;
@@ -25,31 +26,21 @@ use std::collections::HashMap;
 use std::io;
 use std::rc::Rc;
 
-pub(crate) struct SimpleUpdateEvaluator<'a, R, W> {
-    read: R,
-    write: &'a mut W,
+pub(crate) struct SimpleUpdateEvaluator<'a> {
+    storage: &'a Storage,
     base_iri: Option<Rc<Iri<String>>>,
     options: UpdateOptions,
     client: Client,
 }
 
-impl<
-        'a,
-        R: ReadableEncodedStore + Clone + 'static,
-        W: StrContainer + WritableEncodedStore + 'a,
-    > SimpleUpdateEvaluator<'a, R, W>
-where
-    io::Error: From<StoreOrParseError<W::Error>>,
-{
+impl<'a> SimpleUpdateEvaluator<'a> {
     pub fn new(
-        read: R,
-        write: &'a mut W,
+        storage: &'a Storage,
         base_iri: Option<Rc<Iri<String>>>,
         options: UpdateOptions,
     ) -> Self {
         Self {
-            read,
-            write,
+            storage,
             base_iri,
             options,
             client: Client::new(),
@@ -102,7 +93,7 @@ where
         let mut bnodes = HashMap::new();
         for quad in data {
             if let Some(quad) = self.encode_quad_for_insertion(quad, &mut bnodes)? {
-                self.write.insert_encoded(&quad).map_err(to_eval_error)?;
+                self.storage.insert(&quad)?;
             }
         }
         Ok(())
@@ -111,7 +102,7 @@ where
     fn eval_delete_data(&mut self, data: &[Quad]) -> Result<(), EvaluationError> {
         for quad in data {
             if let Some(quad) = self.encode_quad_for_deletion(quad)? {
-                self.write.remove_encoded(&quad).map_err(to_eval_error)?;
+                self.storage.remove(&quad)?;
             }
         }
         Ok(())
@@ -124,9 +115,9 @@ where
         using: &QueryDataset,
         algebra: &GraphPattern,
     ) -> Result<(), EvaluationError> {
-        let dataset = Rc::new(DatasetView::new(self.read.clone(), using)?);
+        let dataset = Rc::new(DatasetView::new(self.storage.clone(), using)?);
         let (plan, variables) = PlanBuilder::build(dataset.as_ref(), algebra)?;
-        let evaluator = SimpleEvaluator::<DatasetView<R>>::new(
+        let evaluator = SimpleEvaluator::new(
             dataset.clone(),
             self.base_iri.clone(),
             self.options.query_options.service_handler.clone(),
@@ -138,22 +129,16 @@ where
                 .into_iter()
                 .map(|t| {
                     Ok(if let Some(t) = t {
-                        t.on_each_id(|id| {
-                            self.write
-                                .insert_str(
-                                    &dataset
-                                        .get_str(id)
-                                        .map_err(to_eval_error)?
-                                        .ok_or_else(|| {
-                                            EvaluationError::msg(
-                                                "String not stored in the string store",
-                                            )
-                                        })
-                                        .map_err(to_eval_error)?,
-                                )
-                                .map(|_| ())
-                                .map_err(to_eval_error)
-                        })?;
+                        let r: Result<_, EvaluationError> = t.on_each_id(|id| {
+                            self.storage.insert_str(
+                                id,
+                                &dataset.get_str(id)?.ok_or_else(|| {
+                                    EvaluationError::msg("String not stored in the string store")
+                                })?,
+                            )?;
+                            Ok(())
+                        });
+                        r?;
                         Some(t)
                     } else {
                         None
@@ -165,14 +150,14 @@ where
                 if let Some(quad) =
                     self.encode_quad_pattern_for_deletion(quad, &variables, &tuple)?
                 {
-                    self.write.remove_encoded(&quad).map_err(to_eval_error)?;
+                    self.storage.remove(&quad)?;
                 }
             }
             for quad in insert {
                 if let Some(quad) =
                     self.encode_quad_pattern_for_insertion(quad, &variables, &tuple, &mut bnodes)?
                 {
-                    self.write.insert_encoded(&quad).map_err(to_eval_error)?;
+                    self.storage.insert(&quad)?;
                 }
             }
             bnodes.clear();
@@ -223,7 +208,7 @@ where
             GraphNameRef::DefaultGraph
         };
         load_graph(
-            self.write,
+            self.storage,
             response.into_body(),
             format,
             to_graph_name,
@@ -235,11 +220,7 @@ where
 
     fn eval_create(&mut self, graph: &NamedNode, silent: bool) -> Result<(), EvaluationError> {
         let encoded_graph_name = self.encode_named_node_for_insertion(graph)?;
-        if self
-            .read
-            .contains_encoded_named_graph(encoded_graph_name)
-            .map_err(to_eval_error)?
-        {
+        if self.storage.contains_named_graph(encoded_graph_name)? {
             if silent {
                 Ok(())
             } else {
@@ -249,9 +230,8 @@ where
                 )))
             }
         } else {
-            self.write
-                .insert_encoded_named_graph(encoded_graph_name)
-                .map_err(to_eval_error)
+            self.storage.insert_named_graph(encoded_graph_name)?;
+            Ok(())
         }
     }
 
@@ -259,15 +239,8 @@ where
         match graph {
             GraphTarget::NamedNode(graph_name) => {
                 if let Some(graph_name) = self.encode_named_node_for_deletion(graph_name)? {
-                    if self
-                        .read
-                        .contains_encoded_named_graph(graph_name)
-                        .map_err(to_eval_error)?
-                    {
-                        return self
-                            .write
-                            .clear_encoded_graph(graph_name)
-                            .map_err(to_eval_error);
+                    if self.storage.contains_named_graph(graph_name)? {
+                        return Ok(self.storage.clear_graph(graph_name)?);
                     }
                 }
                 if silent {
@@ -279,29 +252,20 @@ where
                     )))
                 }
             }
-            GraphTarget::DefaultGraph => self
-                .write
-                .clear_encoded_graph(EncodedTerm::DefaultGraph)
-                .map_err(to_eval_error),
+            GraphTarget::DefaultGraph => Ok(self.storage.clear_graph(EncodedTerm::DefaultGraph)?),
             GraphTarget::NamedGraphs => {
                 // TODO: optimize?
-                for graph in self.read.encoded_named_graphs() {
-                    self.write
-                        .clear_encoded_graph(graph.map_err(to_eval_error)?)
-                        .map_err(to_eval_error)?;
+                for graph in self.storage.named_graphs() {
+                    self.storage.clear_graph(graph?)?;
                 }
                 Ok(())
             }
             GraphTarget::AllGraphs => {
                 // TODO: optimize?
-                for graph in self.read.encoded_named_graphs() {
-                    self.write
-                        .clear_encoded_graph(graph.map_err(to_eval_error)?)
-                        .map_err(to_eval_error)?;
+                for graph in self.storage.named_graphs() {
+                    self.storage.clear_graph(graph?)?;
                 }
-                self.write
-                    .clear_encoded_graph(EncodedTerm::DefaultGraph)
-                    .map_err(to_eval_error)
+                Ok(self.storage.clear_graph(EncodedTerm::DefaultGraph)?)
             }
         }
     }
@@ -310,15 +274,9 @@ where
         match graph {
             GraphTarget::NamedNode(graph_name) => {
                 if let Some(graph_name) = self.encode_named_node_for_deletion(graph_name)? {
-                    if self
-                        .read
-                        .contains_encoded_named_graph(graph_name)
-                        .map_err(to_eval_error)?
-                    {
-                        return self
-                            .write
-                            .remove_encoded_named_graph(graph_name)
-                            .map_err(to_eval_error);
+                    if self.storage.contains_named_graph(graph_name)? {
+                        self.storage.remove_named_graph(graph_name)?;
+                        return Ok(());
                     }
                 }
                 if silent {
@@ -330,20 +288,15 @@ where
                     )))
                 }
             }
-            GraphTarget::DefaultGraph => self
-                .write
-                .clear_encoded_graph(EncodedTerm::DefaultGraph)
-                .map_err(to_eval_error),
+            GraphTarget::DefaultGraph => Ok(self.storage.clear_graph(EncodedTerm::DefaultGraph)?),
             GraphTarget::NamedGraphs => {
                 // TODO: optimize?
-                for graph in self.read.encoded_named_graphs() {
-                    self.write
-                        .remove_encoded_named_graph(graph.map_err(to_eval_error)?)
-                        .map_err(to_eval_error)?;
+                for graph in self.storage.named_graphs() {
+                    self.storage.remove_named_graph(graph?)?;
                 }
                 Ok(())
             }
-            GraphTarget::AllGraphs => self.write.clear().map_err(to_eval_error),
+            GraphTarget::AllGraphs => Ok(self.storage.clear()?),
         }
     }
 
@@ -358,20 +311,17 @@ where
                     self.encode_named_node_for_insertion(subject)?
                 }
                 NamedOrBlankNode::BlankNode(subject) => self
-                    .write
-                    .encode_blank_node(bnodes.entry(subject.clone()).or_default().as_ref())
-                    .map_err(to_eval_error)?,
+                    .storage
+                    .encode_blank_node(bnodes.entry(subject.clone()).or_default().as_ref())?,
             },
             predicate: self
-                .write
-                .encode_named_node(NamedNodeRef::new_unchecked(&quad.predicate.iri))
-                .map_err(to_eval_error)?,
+                .storage
+                .encode_named_node(NamedNodeRef::new_unchecked(&quad.predicate.iri))?,
             object: match &quad.object {
                 Term::NamedNode(object) => self.encode_named_node_for_insertion(object)?,
                 Term::BlankNode(object) => self
-                    .write
-                    .encode_blank_node(bnodes.entry(object.clone()).or_default().as_ref())
-                    .map_err(to_eval_error)?,
+                    .storage
+                    .encode_blank_node(bnodes.entry(object.clone()).or_default().as_ref())?,
                 Term::Literal(object) => self.encode_literal_for_insertion(object)?,
             },
             graph_name: match &quad.graph_name {
@@ -446,9 +396,8 @@ where
             TermOrVariable::Term(term) => Some(match term {
                 Term::NamedNode(term) => self.encode_named_node_for_insertion(term)?,
                 Term::BlankNode(bnode) => self
-                    .write
-                    .encode_blank_node(bnodes.entry(bnode.clone()).or_default().as_ref())
-                    .map_err(to_eval_error)?,
+                    .storage
+                    .encode_blank_node(bnodes.entry(bnode.clone()).or_default().as_ref())?,
                 Term::Literal(term) => self.encode_literal_for_insertion(term)?,
             }),
             TermOrVariable::Variable(v) => {
@@ -501,17 +450,16 @@ where
         &mut self,
         term: &NamedNode,
     ) -> Result<EncodedTerm, EvaluationError> {
-        self.write
-            .encode_named_node(NamedNodeRef::new_unchecked(&term.iri))
-            .map_err(to_eval_error)
+        Ok(self
+            .storage
+            .encode_named_node(NamedNodeRef::new_unchecked(&term.iri))?)
     }
 
     fn encode_literal_for_insertion(
         &mut self,
         term: &Literal,
     ) -> Result<EncodedTerm, EvaluationError> {
-        self.write
-            .encode_literal(match term {
+        Ok(self.storage.encode_literal(match term {
             Literal::Simple { value } => LiteralRef::new_simple_literal(value),
             Literal::LanguageTaggedString { value, language } => {
                 LiteralRef::new_language_tagged_literal_unchecked(value, language)
@@ -519,8 +467,7 @@ where
             Literal::Typed { value, datatype } => {
                 LiteralRef::new_typed_literal(value, NamedNodeRef::new_unchecked(&datatype.iri))
             }
-            })
-            .map_err(to_eval_error)
+        })?)
     }
 
     fn encode_quad_for_deletion(
@@ -675,17 +622,16 @@ where
         &self,
         term: &NamedNode,
     ) -> Result<Option<EncodedTerm>, EvaluationError> {
-        self.read
-            .get_encoded_named_node(NamedNodeRef::new_unchecked(&term.iri))
-            .map_err(to_eval_error)
+        Ok(self
+            .storage
+            .get_encoded_named_node(NamedNodeRef::new_unchecked(&term.iri))?)
     }
 
     fn encode_literal_for_deletion(
         &self,
         term: &Literal,
     ) -> Result<Option<EncodedTerm>, EvaluationError> {
-        self.read
-            .get_encoded_literal(match term {
+        Ok(self.storage.get_encoded_literal(match term {
             Literal::Simple { value } => LiteralRef::new_simple_literal(value),
             Literal::LanguageTaggedString { value, language } => {
                 LiteralRef::new_language_tagged_literal_unchecked(value, language)
@@ -693,11 +639,6 @@ where
             Literal::Typed { value, datatype } => {
                 LiteralRef::new_typed_literal(value, NamedNodeRef::new_unchecked(&datatype.iri))
             }
-            })
-            .map_err(to_eval_error)
-    }
+        })?)
     }
-
-fn to_eval_error(e: impl Into<EvaluationError>) -> EvaluationError {
-    e.into()
 }

lib/src/store/mod.rs

@@ -14,6 +14,7 @@ use crate::error::invalid_input_error;
 use crate::io::{DatasetFormat, DatasetSerializer, GraphFormat, GraphSerializer};
 use crate::model::*;
 use crate::store::numeric_encoder::*;
+use crate::store::storage::StorageLike;
 use oxiri::Iri;
 use rio_api::parser::{QuadsParser, TriplesParser};
 use rio_turtle::{NQuadsParser, NTriplesParser, TriGParser, TurtleError, TurtleParser};
@@ -55,8 +56,8 @@ pub(crate) trait WritableEncodedStore: StrEncodingAware {
     fn clear(&mut self) -> Result<(), Self::Error>;
 }
 
-pub(crate) fn load_graph<S: WritableEncodedStore + StrContainer>(
-    store: &mut S,
+pub(crate) fn load_graph<S: StorageLike>(
+    storage: &S,
     reader: impl BufRead,
     format: GraphFormat,
     to_graph_name: GraphNameRef<'_>,
@@ -69,19 +70,19 @@ pub(crate) fn load_graph<S: WritableEncodedStore + StrContainer>(
     };
     match format {
         GraphFormat::NTriples => {
-            load_from_triple_parser(store, NTriplesParser::new(reader), to_graph_name)
+            load_from_triple_parser(storage, NTriplesParser::new(reader), to_graph_name)
         }
         GraphFormat::Turtle => {
-            load_from_triple_parser(store, TurtleParser::new(reader, base_iri), to_graph_name)
+            load_from_triple_parser(storage, TurtleParser::new(reader, base_iri), to_graph_name)
         }
         GraphFormat::RdfXml => {
-            load_from_triple_parser(store, RdfXmlParser::new(reader, base_iri), to_graph_name)
+            load_from_triple_parser(storage, RdfXmlParser::new(reader, base_iri), to_graph_name)
         }
     }
 }
 
-fn load_from_triple_parser<S: WritableEncodedStore + StrContainer, P: TriplesParser>(
-    store: &mut S,
+fn load_from_triple_parser<S: StorageLike, P: TriplesParser>(
+    storage: &S,
     mut parser: P,
     to_graph_name: GraphNameRef<'_>,
 ) -> Result<(), StoreOrParseError<S::Error>>
@@ -89,16 +90,14 @@ where
     StoreOrParseError<S::Error>: From<P::Error>,
 {
     let mut bnode_map = HashMap::default();
-    let to_graph_name = store
+    let to_graph_name = storage
         .encode_graph_name(to_graph_name)
         .map_err(StoreOrParseError::Store)?;
     parser.parse_all(&mut move |t| {
-        let quad = store
+        let quad = storage
             .encode_rio_triple_in_graph(t, to_graph_name, &mut bnode_map)
             .map_err(StoreOrParseError::Store)?;
-        store
-            .insert_encoded(&quad)
-            .map_err(StoreOrParseError::Store)?;
+        storage.insert(&quad).map_err(StoreOrParseError::Store)?;
         Ok(())
     })
 }

lib/src/store/sled.rs

@@ -112,7 +112,7 @@ impl SledStore {
         query: impl TryInto<Query, Error = impl Into<EvaluationError>>,
         options: QueryOptions,
     ) -> Result<QueryResults, EvaluationError> {
-        evaluate_query(self.clone(), query, options)
+        evaluate_query(self.storage.clone(), query, options)
     }
 
     /// Retrieves quads with a filter on each quad component
@@ -213,8 +213,7 @@ impl SledStore {
         options: UpdateOptions,
     ) -> Result<(), EvaluationError> {
         evaluate_update(
-            self.clone(),
-            &mut &*self,
+            &self.storage,
             update.try_into().map_err(|e| e.into())?,
             options,
         )
@@ -290,8 +289,13 @@ impl SledStore {
         to_graph_name: impl Into<GraphNameRef<'a>>,
         base_iri: Option<&str>,
     ) -> Result<(), io::Error> {
-        let mut this = self;
-        load_graph(&mut this, reader, format, to_graph_name.into(), base_iri)?;
+        load_graph(
+            &self.storage,
+            reader,
+            format,
+            to_graph_name.into(),
+            base_iri,
+        )?;
         Ok(())
     }
 
@@ -698,8 +702,13 @@ impl SledTransaction<'_> {
         to_graph_name: impl Into<GraphNameRef<'a>>,
         base_iri: Option<&str>,
     ) -> Result<(), SledUnabortableTransactionError> {
-        let mut this = self;
-        load_graph(&mut this, reader, format, to_graph_name.into(), base_iri)?;
+        load_graph(
+            &self.storage,
+            reader,
+            format,
+            to_graph_name.into(),
+            base_iri,
+        )?;
         Ok(())
     }
 

lib/src/store/storage.rs

@@ -1029,3 +1029,29 @@ impl<'a> StrContainer for StorageTransaction<'a> {
         Ok(key)
     }
 }
+
+pub(crate) trait StorageLike: StrLookup + StrContainer {
+    fn insert(&self, quad: &EncodedQuad) -> Result<bool, Self::Error>;
+
+    fn remove(&self, quad: &EncodedQuad) -> Result<bool, Self::Error>;
+}
+
+impl StorageLike for Storage {
+    fn insert(&self, quad: &EncodedQuad) -> Result<bool, Self::Error> {
+        self.insert(quad)
+    }
+
+    fn remove(&self, quad: &EncodedQuad) -> Result<bool, Self::Error> {
+        self.remove(quad)
+    }
+}
+
+impl<'a> StorageLike for StorageTransaction<'a> {
+    fn insert(&self, quad: &EncodedQuad) -> Result<bool, Self::Error> {
+        self.insert(quad)
+    }
+
+    fn remove(&self, quad: &EncodedQuad) -> Result<bool, Self::Error> {
+        self.remove(quad)
+    }
+}