Introduces a TermEncoder struct

Will allow configuring term encoding in the future

lib/oxrdf/src/triple.rs

@@ -921,6 +921,23 @@ impl From<BlankNodeRef<'_>> for GraphName {
     }
 }
 
+impl From<NamedOrBlankNode> for GraphName {
+    #[inline]
+    fn from(node: NamedOrBlankNode) -> Self {
+        match node {
+            NamedOrBlankNode::NamedNode(node) => node.into(),
+            NamedOrBlankNode::BlankNode(node) => node.into(),
+        }
+    }
+}
+
+impl From<NamedOrBlankNodeRef<'_>> for GraphName {
+    #[inline]
+    fn from(node: NamedOrBlankNodeRef<'_>) -> Self {
+        node.into_owned().into()
+    }
+}
+
 /// A possible borrowed graph name.
 /// It is the union of [IRIs](https://www.w3.org/TR/rdf11-concepts/#dfn-iri), [blank nodes](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node), and the [default graph name](https://www.w3.org/TR/rdf11-concepts/#dfn-default-graph).
 #[derive(Eq, PartialEq, Debug, Clone, Copy, Hash)]
@@ -995,6 +1012,23 @@ impl<'a> From<&'a BlankNode> for GraphNameRef<'a> {
     }
 }
 
+impl<'a> From<NamedOrBlankNodeRef<'a>> for GraphNameRef<'a> {
+    #[inline]
+    fn from(node: NamedOrBlankNodeRef<'a>) -> Self {
+        match node {
+            NamedOrBlankNodeRef::NamedNode(node) => node.into(),
+            NamedOrBlankNodeRef::BlankNode(node) => node.into(),
+        }
+    }
+}
+
+impl<'a> From<&'a NamedOrBlankNode> for GraphNameRef<'a> {
+    #[inline]
+    fn from(node: &'a NamedOrBlankNode) -> Self {
+        node.as_ref().into()
+    }
+}
+
 impl<'a> From<&'a GraphName> for GraphNameRef<'a> {
     #[inline]
     fn from(node: &'a GraphName) -> Self {

lib/src/sparql/dataset.rs

@@ -1,7 +1,9 @@
 use crate::model::TermRef;
 use crate::sparql::algebra::QueryDataset;
 use crate::sparql::EvaluationError;
-use crate::storage::numeric_encoder::{insert_term, EncodedQuad, EncodedTerm, StrHash, StrLookup};
+use crate::storage::numeric_encoder::{
+    insert_term, EncodedQuad, EncodedTerm, StrHash, StrLookup, TermDecoder,
+};
 use crate::storage::{StorageError, StorageReader};
 use std::cell::RefCell;
 use std::collections::hash_map::Entry;
@@ -16,13 +18,20 @@ pub struct DatasetView {
 
 impl DatasetView {
     pub fn new(reader: StorageReader, dataset: &QueryDataset) -> Self {
+        let encoder = reader.term_encoder();
         let dataset = EncodedDatasetSpec {
-            default: dataset
-                .default_graph_graphs()
-                .map(|graphs| graphs.iter().map(|g| g.as_ref().into()).collect::<Vec<_>>()),
-            named: dataset
-                .available_named_graphs()
-                .map(|graphs| graphs.iter().map(|g| g.as_ref().into()).collect::<Vec<_>>()),
+            default: dataset.default_graph_graphs().map(|graphs| {
+                graphs
+                    .iter()
+                    .map(|g| encoder.encode_graph_name(g))
+                    .collect::<Vec<_>>()
+            }),
+            named: dataset.available_named_graphs().map(|graphs| {
+                graphs
+                    .iter()
+                    .map(|g| encoder.encode_term(g))
+                    .collect::<Vec<_>>()
+            }),
         };
         Self {
             reader,
@@ -150,7 +159,7 @@ impl DatasetView {
 
     pub fn encode_term<'a>(&self, term: impl Into<TermRef<'a>>) -> EncodedTerm {
         let term = term.into();
-        let encoded = term.into();
+        let encoded = self.reader.term_encoder().encode_term(term);
         insert_term(term, &encoded, &mut |key, value| {
             self.insert_str(key, value);
             Ok(())
@@ -159,6 +168,10 @@ impl DatasetView {
         encoded
     }
 
+    pub fn term_decoder(&self) -> TermDecoder<Self> {
+        TermDecoder::new(self)
+    }
+
     pub fn insert_str(&self, key: &StrHash, value: &str) {
         if let Entry::Vacant(e) = self.extra.borrow_mut().entry(*key) {
             if !matches!(self.reader.contains_str(key), Ok(true)) {

lib/src/sparql/eval.rs

@@ -659,7 +659,9 @@ impl SimpleEvaluator {
         let service_name = get_pattern_value(service_name, from)
             .ok_or_else(|| EvaluationError::msg("The SERVICE name is not bound"))?;
         if let QueryResults::Solutions(iter) = self.service_handler.handle(
-            self.dataset.decode_named_node(&service_name)?,
+            self.dataset
+                .term_decoder()
+                .decode_named_node(&service_name)?,
             Query {
                 inner: spargebra::Query::Select {
                     dataset: None,
@@ -2029,7 +2031,7 @@ impl SimpleEvaluator {
                     Rc::new(move |tuple| {
                         let args = args
                             .iter()
-                            .map(|f| dataset.decode_term(&f(tuple)?).ok())
+                            .map(|f| dataset.term_decoder().decode_term(&f(tuple)?).ok())
                             .collect::<Option<Vec<_>>>()?;
                         Some(dataset.encode_term(&function(&args)?))
                     })
@@ -2307,9 +2309,10 @@ fn decode_bindings(
         variables,
         Box::new(iter.map(move |values| {
             let mut result = vec![None; tuple_size];
+            let decoder = dataset.term_decoder();
             for (i, value) in values?.iter().enumerate() {
                 if let Some(term) = value {
-                    result[i] = Some(dataset.decode_term(&term)?)
+                    result[i] = Some(decoder.decode_term(&term)?)
                 }
             }
             Ok(result)
@@ -2569,9 +2572,10 @@ fn cmp_terms(dataset: &DatasetView, a: Option<&EncodedTerm>, b: Option<&EncodedT
                 b => {
                     if let Some(ord) = partial_cmp_literals(dataset, a, b) {
                         ord
-                    } else if let (Ok(Term::Literal(a)), Ok(Term::Literal(b))) =
-                        (dataset.decode_term(a), dataset.decode_term(b))
-                    {
+                    } else if let (Ok(Term::Literal(a)), Ok(Term::Literal(b))) = (
+                        dataset.term_decoder().decode_term(a),
+                        dataset.term_decoder().decode_term(b),
+                    ) {
                         (a.value(), a.datatype(), a.language()).cmp(&(
                             b.value(),
                             b.datatype(),
@@ -3323,7 +3327,7 @@ impl Iterator for ConstructIterator {
                         get_triple_template_value(&template.object, &tuple, &mut self.bnodes),
                     ) {
                         self.buffered_results.push(decode_triple(
-                            &*self.eval.dataset,
+                            &self.eval.dataset.term_decoder(),
                             &subject,
                             &predicate,
                             &object,
@@ -3373,8 +3377,8 @@ fn new_bnode() -> EncodedTerm {
     EncodedTerm::NumericalBlankNode { id: random() }
 }
 
-fn decode_triple<D: Decoder>(
-    decoder: &D,
+fn decode_triple<S: StrLookup>(
+    decoder: &TermDecoder<S>,
     subject: &EncodedTerm,
     predicate: &EncodedTerm,
     object: &EncodedTerm,
@@ -3402,6 +3406,7 @@ impl Iterator for DescribeIterator {
                     Ok(quad) => self
                         .eval
                         .dataset
+                        .term_decoder()
                         .decode_quad(&quad)
                         .map(|q| q.into())
                         .map_err(|e| e.into()),

lib/src/sparql/update.rs

@@ -8,7 +8,7 @@ use crate::sparql::http::Client;
 use crate::sparql::plan::EncodedTuple;
 use crate::sparql::plan_builder::PlanBuilder;
 use crate::sparql::{EvaluationError, Update, UpdateOptions};
-use crate::storage::numeric_encoder::{Decoder, EncodedTerm};
+use crate::storage::numeric_encoder::EncodedTerm;
 use crate::storage::StorageWriter;
 use oxiri::Iri;
 use spargebra::algebra::{GraphPattern, GraphTarget};
@@ -191,11 +191,12 @@ impl<'a, 'b: 'a> SimpleUpdateEvaluator<'a, 'b> {
     fn eval_clear(&mut self, graph: &GraphTarget, silent: bool) -> Result<(), EvaluationError> {
         match graph {
             GraphTarget::NamedNode(graph_name) => {
-                if self
-                    .transaction
-                    .reader()
-                    .contains_named_graph(&graph_name.as_ref().into())?
-                {
+                if self.transaction.reader().contains_named_graph(
+                    &self
+                        .transaction
+                        .term_encoder()
+                        .encode_graph_name(graph_name),
+                )? {
                     Ok(self.transaction.clear_graph(graph_name.into())?)
                 } else if silent {
                     Ok(())
@@ -374,7 +375,7 @@ impl<'a, 'b: 'a> SimpleUpdateEvaluator<'a, 'b> {
                     .map(|t| t.into())
             }
             TermPattern::Variable(v) => Self::lookup_variable(v, variables, values)
-                .map(|node| dataset.decode_term(&node))
+                .map(|node| dataset.term_decoder().decode_term(&node))
                 .transpose()?,
         })
     }
@@ -388,7 +389,7 @@ impl<'a, 'b: 'a> SimpleUpdateEvaluator<'a, 'b> {
         Ok(match term {
             NamedNodePattern::NamedNode(term) => Some(term.clone()),
             NamedNodePattern::Variable(v) => Self::lookup_variable(v, variables, values)
-                .map(|node| dataset.decode_named_node(&node))
+                .map(|node| dataset.term_decoder().decode_named_node(&node))
                 .transpose()?,
         })
     }
@@ -407,7 +408,7 @@ impl<'a, 'b: 'a> SimpleUpdateEvaluator<'a, 'b> {
                     Ok(if node == EncodedTerm::DefaultGraph {
                         OxGraphName::DefaultGraph
                     } else {
-                        dataset.decode_named_node(&node)?.into()
+                        dataset.term_decoder().decode_named_node(&node)?.into()
                     })
                 })
                 .transpose(),
@@ -507,7 +508,7 @@ impl<'a, 'b: 'a> SimpleUpdateEvaluator<'a, 'b> {
                     .map(|t| t.into())
             }
             GroundTermPattern::Variable(v) => Self::lookup_variable(v, variables, values)
-                .map(|node| dataset.decode_term(&node))
+                .map(|node| dataset.term_decoder().decode_term(&node))
                 .transpose()?,
         })
     }

lib/src/storage/binary_encoder.rs

@@ -742,11 +742,13 @@ mod tests {
             )
             .into(),
         ];
+        let decoder = TermDecoder::new(&store);
         for term in terms {
-            let encoded = term.as_ref().into();
+            let encoder = TermEncoder::new();
+            let encoded = encoder.encode_term(&term);
+            assert_eq!(encoded, encoder.encode_term(&term));
             store.insert_term(term.as_ref(), &encoded);
-            assert_eq!(encoded, term.as_ref().into());
-            assert_eq!(term, store.decode_term(&encoded).unwrap());
+            assert_eq!(term, decoder.decode_term(&encoded).unwrap());
 
             let mut buffer = Vec::new();
             write_term(&mut buffer, &encoded);

lib/src/storage/mod.rs

@@ -10,7 +10,7 @@ use crate::storage::binary_encoder::{
 };
 pub use crate::storage::error::{CorruptionError, LoaderError, SerializerError, StorageError};
 use crate::storage::numeric_encoder::{
-    insert_term, Decoder, EncodedQuad, EncodedTerm, StrHash, StrLookup,
+    insert_term, EncodedQuad, EncodedTerm, StrHash, StrLookup, TermDecoder, TermEncoder,
 };
 use backend::{ColumnFamily, ColumnFamilyDefinition, Db, Iter};
 use std::cmp::{max, min};
@@ -294,6 +294,15 @@ pub struct StorageReader {
 }
 
 impl StorageReader {
+    #[allow(clippy::unused_self)]
+    pub fn term_encoder(&self) -> TermEncoder {
+        TermEncoder::new()
+    }
+
+    pub fn term_decoder(&self) -> TermDecoder<Self> {
+        TermDecoder::new(self)
+    }
+
     pub fn len(&self) -> Result<usize, StorageError> {
         Ok(self.reader.len(&self.storage.gspo_cf)? + self.reader.len(&self.storage.dspo_cf)?)
     }
@@ -654,7 +663,7 @@ impl StorageReader {
         }
         for spo in self.dspo_quads(&[]) {
             let spo = spo?;
-            self.decode_quad(&spo)?; // We ensure that the quad is readable
+            self.term_decoder().decode_quad(&spo)?; // We ensure that the quad is readable
             if !self.storage.db.contains_key(
                 &self.storage.dpos_cf,
                 &encode_term_triple(&spo.predicate, &spo.object, &spo.subject),
@@ -684,7 +693,7 @@ impl StorageReader {
         }
         for gspo in self.gspo_quads(&[]) {
             let gspo = gspo?;
-            self.decode_quad(&gspo)?; // We ensure that the quad is readable
+            self.term_decoder().decode_quad(&gspo)?; // We ensure that the quad is readable
             if !self.storage.db.contains_key(
                 &self.storage.gpos_cf,
                 &encode_term_quad(
@@ -848,8 +857,13 @@ impl<'a> StorageWriter<'a> {
         }
     }
 
+    #[allow(clippy::unused_self)]
+    pub fn term_encoder(&self) -> TermEncoder {
+        TermEncoder::new()
+    }
+
     pub fn insert(&mut self, quad: QuadRef<'_>) -> Result<bool, StorageError> {
-        let encoded = quad.into();
+        let encoded = self.term_encoder().encode_quad(quad);
         self.buffer.clear();
         let result = if quad.graph_name.is_default_graph() {
             write_spo_quad(&mut self.buffer, &encoded);
@@ -937,7 +951,7 @@ impl<'a> StorageWriter<'a> {
         &mut self,
         graph_name: NamedOrBlankNodeRef<'_>,
     ) -> Result<bool, StorageError> {
-        let encoded_graph_name = graph_name.into();
+        let encoded_graph_name = self.term_encoder().encode_graph_name(graph_name);
 
         self.buffer.clear();
         write_term(&mut self.buffer, &encoded_graph_name);
@@ -1001,7 +1015,7 @@ impl<'a> StorageWriter<'a> {
     }
 
     pub fn remove(&mut self, quad: QuadRef<'_>) -> Result<bool, StorageError> {
-        self.remove_encoded(&quad.into())
+        self.remove_encoded(&self.term_encoder().encode_quad(quad))
     }
 
     fn remove_encoded(&mut self, quad: &EncodedQuad) -> Result<bool, StorageError> {
@@ -1077,14 +1091,15 @@ impl<'a> StorageWriter<'a> {
                 self.remove_encoded(&quad?)?;
             }
         } else {
+            let graph_name = self.term_encoder().encode_graph_name(graph_name);
             self.buffer.clear();
-            write_term(&mut self.buffer, &graph_name.into());
+            write_term(&mut self.buffer, &graph_name);
             if self
                 .transaction
                 .contains_key_for_update(&self.storage.graphs_cf, &self.buffer)?
             {
                 // The condition is useful to lock the graph itself and ensure no quad is inserted at the same time
-                for quad in self.reader().quads_for_graph(&graph_name.into()) {
+                for quad in self.reader().quads_for_graph(&graph_name) {
                     self.remove_encoded(&quad?)?;
                 }
             }
@@ -1110,7 +1125,7 @@ impl<'a> StorageWriter<'a> {
         &mut self,
         graph_name: NamedOrBlankNodeRef<'_>,
     ) -> Result<bool, StorageError> {
-        self.remove_encoded_named_graph(&graph_name.into())
+        self.remove_encoded_named_graph(&self.term_encoder().encode_graph_name(graph_name))
     }
 
     fn remove_encoded_named_graph(
@@ -1323,8 +1338,9 @@ impl FileBulkLoader {
     }
 
     fn encode(&mut self, quads: impl IntoIterator<Item = Quad>) -> Result<(), StorageError> {
+        let encoder = TermEncoder::new();
         for quad in quads {
-            let encoded = EncodedQuad::from(quad.as_ref());
+            let encoded = encoder.encode_quad(&quad);
             if quad.graph_name.is_default_graph() {
                 if self.triples.insert(encoded.clone()) {
                     self.insert_term(quad.subject.as_ref().into(), &encoded.subject)?;

lib/src/storage/numeric_encoder.rs

@@ -429,33 +429,88 @@ impl From<EncodedTriple> for EncodedTerm {
     }
 }
 
-impl From<NamedNodeRef<'_>> for EncodedTerm {
-    fn from(named_node: NamedNodeRef<'_>) -> Self {
-        Self::NamedNode {
-            iri_id: StrHash::new(named_node.as_str()),
+#[derive(Eq, PartialEq, Debug, Clone, Hash)]
+pub struct EncodedTriple {
+    pub subject: EncodedTerm,
+    pub predicate: EncodedTerm,
+    pub object: EncodedTerm,
+}
+
+impl EncodedTriple {
+    pub fn new(subject: EncodedTerm, predicate: EncodedTerm, object: EncodedTerm) -> Self {
+        Self {
+            subject,
+            predicate,
+            object,
         }
     }
 }
 
-impl From<BlankNodeRef<'_>> for EncodedTerm {
-    fn from(blank_node: BlankNodeRef<'_>) -> Self {
+#[derive(Eq, PartialEq, Debug, Clone, Hash)]
+pub struct EncodedQuad {
+    pub subject: EncodedTerm,
+    pub predicate: EncodedTerm,
+    pub object: EncodedTerm,
+    pub graph_name: EncodedTerm,
+}
+
+impl EncodedQuad {
+    pub fn new(
+        subject: EncodedTerm,
+        predicate: EncodedTerm,
+        object: EncodedTerm,
+        graph_name: EncodedTerm,
+    ) -> Self {
+        Self {
+            subject,
+            predicate,
+            object,
+            graph_name,
+        }
+    }
+}
+
+pub struct TermEncoder {}
+
+impl TermEncoder {
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    pub fn encode_term<'a>(&self, term: impl Into<TermRef<'a>>) -> EncodedTerm {
+        match term.into() {
+            TermRef::NamedNode(named_node) => self.encode_named_node(named_node),
+            TermRef::BlankNode(blank_node) => self.encode_blank_node(blank_node),
+            TermRef::Literal(literal) => self.encode_literal(literal),
+            TermRef::Triple(triple) => self.encode_triple(triple.as_ref()).into(),
+        }
+    }
+
+    #[allow(clippy::unused_self)]
+    fn encode_named_node(&self, named_node: NamedNodeRef<'_>) -> EncodedTerm {
+        EncodedTerm::NamedNode {
+            iri_id: StrHash::new(named_node.as_str()),
+        }
+    }
+
+    #[allow(clippy::unused_self)]
+    fn encode_blank_node(&self, blank_node: BlankNodeRef<'_>) -> EncodedTerm {
         if let Some(id) = blank_node.unique_id() {
-            Self::NumericalBlankNode { id }
+            EncodedTerm::NumericalBlankNode { id }
         } else {
             let id = blank_node.as_str();
             if let Ok(id) = id.try_into() {
-                Self::SmallBlankNode(id)
+                EncodedTerm::SmallBlankNode(id)
             } else {
-                Self::BigBlankNode {
+                EncodedTerm::BigBlankNode {
                     id_id: StrHash::new(id),
                 }
             }
         }
     }
-}
 
-impl From<LiteralRef<'_>> for EncodedTerm {
-    fn from(literal: LiteralRef<'_>) -> Self {
+    #[allow(clippy::unused_self)]
+    fn encode_literal(&self, literal: LiteralRef<'_>) -> EncodedTerm {
         let value = literal.value();
         let datatype = literal.datatype().as_str();
         let native_encoding = match datatype {
@@ -463,20 +518,20 @@ impl From<LiteralRef<'_>> for EncodedTerm {
                 literal.language().map(|language| {
                     if let Ok(value) = SmallString::try_from(value) {
                         if let Ok(language) = SmallString::try_from(language) {
-                            Self::SmallSmallLangStringLiteral { value, language }
+                            EncodedTerm::SmallSmallLangStringLiteral { value, language }
                         } else {
-                            Self::SmallBigLangStringLiteral {
+                            EncodedTerm::SmallBigLangStringLiteral {
                                 value,
                                 language_id: StrHash::new(language),
                             }
                         }
                     } else if let Ok(language) = SmallString::try_from(language) {
-                        Self::BigSmallLangStringLiteral {
+                        EncodedTerm::BigSmallLangStringLiteral {
                             value_id: StrHash::new(value),
                             language,
                         }
                     } else {
-                        Self::BigBigLangStringLiteral {
+                        EncodedTerm::BigBigLangStringLiteral {
                             value_id: StrHash::new(value),
                             language_id: StrHash::new(language),
                         }
@@ -487,9 +542,9 @@ impl From<LiteralRef<'_>> for EncodedTerm {
             "http://www.w3.org/2001/XMLSchema#string" => {
                 let value = value;
                 Some(if let Ok(value) = SmallString::try_from(value) {
-                    Self::SmallStringLiteral(value)
+                    EncodedTerm::SmallStringLiteral(value)
                 } else {
-                    Self::BigStringLiteral {
+                    EncodedTerm::BigStringLiteral {
                         value_id: StrHash::new(value),
                     }
                 })
@@ -532,12 +587,12 @@ impl From<LiteralRef<'_>> for EncodedTerm {
             Some(term) => term,
             None => {
                 if let Ok(value) = SmallString::try_from(value) {
-                    Self::SmallTypedLiteral {
+                    EncodedTerm::SmallTypedLiteral {
                         value,
                         datatype_id: StrHash::new(datatype),
                     }
                 } else {
-                    Self::BigTypedLiteral {
+                    EncodedTerm::BigTypedLiteral {
                         value_id: StrHash::new(value),
                         datatype_id: StrHash::new(datatype),
                     }
@@ -545,112 +600,30 @@ impl From<LiteralRef<'_>> for EncodedTerm {
             }
         }
     }
-}
-
-impl From<NamedOrBlankNodeRef<'_>> for EncodedTerm {
-    fn from(term: NamedOrBlankNodeRef<'_>) -> Self {
-        match term {
-            NamedOrBlankNodeRef::NamedNode(named_node) => named_node.into(),
-            NamedOrBlankNodeRef::BlankNode(blank_node) => blank_node.into(),
-        }
-    }
-}
 
-impl From<SubjectRef<'_>> for EncodedTerm {
-    fn from(term: SubjectRef<'_>) -> Self {
-        match term {
-            SubjectRef::NamedNode(named_node) => named_node.into(),
-            SubjectRef::BlankNode(blank_node) => blank_node.into(),
-            SubjectRef::Triple(triple) => triple.as_ref().into(),
+    pub fn encode_graph_name<'a>(&self, name: impl Into<GraphNameRef<'a>>) -> EncodedTerm {
+        match name.into() {
+            GraphNameRef::NamedNode(named_node) => self.encode_named_node(named_node),
+            GraphNameRef::BlankNode(blank_node) => self.encode_blank_node(blank_node),
+            GraphNameRef::DefaultGraph => EncodedTerm::DefaultGraph,
         }
     }
-}
 
-impl From<TermRef<'_>> for EncodedTerm {
-    fn from(term: TermRef<'_>) -> Self {
-        match term {
-            TermRef::NamedNode(named_node) => named_node.into(),
-            TermRef::BlankNode(blank_node) => blank_node.into(),
-            TermRef::Literal(literal) => literal.into(),
-            TermRef::Triple(triple) => triple.as_ref().into(),
+    fn encode_triple(&self, triple: TripleRef<'_>) -> EncodedTriple {
+        EncodedTriple {
+            subject: self.encode_term(triple.subject),
+            predicate: self.encode_term(triple.predicate),
+            object: self.encode_term(triple.object),
         }
     }
-}
 
-impl From<GraphNameRef<'_>> for EncodedTerm {
-    fn from(name: GraphNameRef<'_>) -> Self {
-        match name {
-            GraphNameRef::NamedNode(named_node) => named_node.into(),
-            GraphNameRef::BlankNode(blank_node) => blank_node.into(),
-            GraphNameRef::DefaultGraph => Self::DefaultGraph,
-        }
-    }
-}
-
-impl From<TripleRef<'_>> for EncodedTerm {
-    fn from(triple: TripleRef<'_>) -> Self {
-        Self::Triple(Rc::new(triple.into()))
-    }
-}
-
-#[derive(Eq, PartialEq, Debug, Clone, Hash)]
-pub struct EncodedTriple {
-    pub subject: EncodedTerm,
-    pub predicate: EncodedTerm,
-    pub object: EncodedTerm,
-}
-
-impl EncodedTriple {
-    pub fn new(subject: EncodedTerm, predicate: EncodedTerm, object: EncodedTerm) -> Self {
-        Self {
-            subject,
-            predicate,
-            object,
-        }
-    }
-}
-
-impl From<TripleRef<'_>> for EncodedTriple {
-    fn from(triple: TripleRef<'_>) -> Self {
-        Self {
-            subject: triple.subject.into(),
-            predicate: triple.predicate.into(),
-            object: triple.object.into(),
-        }
-    }
-}
-
-#[derive(Eq, PartialEq, Debug, Clone, Hash)]
-pub struct EncodedQuad {
-    pub subject: EncodedTerm,
-    pub predicate: EncodedTerm,
-    pub object: EncodedTerm,
-    pub graph_name: EncodedTerm,
-}
-
-impl EncodedQuad {
-    pub fn new(
-        subject: EncodedTerm,
-        predicate: EncodedTerm,
-        object: EncodedTerm,
-        graph_name: EncodedTerm,
-    ) -> Self {
-        Self {
-            subject,
-            predicate,
-            object,
-            graph_name,
-        }
-    }
-}
-
-impl From<QuadRef<'_>> for EncodedQuad {
-    fn from(quad: QuadRef<'_>) -> Self {
-        Self {
-            subject: quad.subject.into(),
-            predicate: quad.predicate.into(),
-            object: quad.object.into(),
-            graph_name: quad.graph_name.into(),
+    pub fn encode_quad<'a>(&self, quad: impl Into<QuadRef<'a>>) -> EncodedQuad {
+        let quad = quad.into();
+        EncodedQuad {
+            subject: self.encode_term(quad.subject),
+            predicate: self.encode_term(quad.predicate),
+            object: self.encode_term(quad.object),
+            graph_name: self.encode_graph_name(quad.graph_name),
         }
     }
 }
@@ -819,10 +792,95 @@ pub fn parse_day_time_duration_str(value: &str) -> Option<EncodedTerm> {
     value.parse().map(EncodedTerm::DayTimeDurationLiteral).ok()
 }
 
-pub trait Decoder: StrLookup {
-    fn decode_term(&self, encoded: &EncodedTerm) -> Result<Term, StorageError>;
+pub struct TermDecoder<'a, S: StrLookup> {
+    lookup: &'a S,
+}
+
+impl<'a, S: StrLookup> TermDecoder<'a, S> {
+    pub fn new(lookup: &'a S) -> Self {
+        Self { lookup }
+    }
+
+    pub fn decode_term(&self, encoded: &EncodedTerm) -> Result<Term, StorageError> {
+        match encoded {
+            EncodedTerm::DefaultGraph => {
+                Err(CorruptionError::msg("The default graph tag is not a valid term").into())
+            }
+            EncodedTerm::NamedNode { iri_id } => {
+                Ok(NamedNode::new_unchecked(get_required_str(self.lookup, iri_id)?).into())
+            }
+            EncodedTerm::NumericalBlankNode { id } => Ok(BlankNode::new_from_unique_id(*id).into()),
+            EncodedTerm::SmallBlankNode(id) => Ok(BlankNode::new_unchecked(id.as_str()).into()),
+            EncodedTerm::BigBlankNode { id_id } => {
+                Ok(BlankNode::new_unchecked(get_required_str(self.lookup, id_id)?).into())
+            }
+            EncodedTerm::SmallStringLiteral(value) => {
+                Ok(Literal::new_simple_literal(*value).into())
+            }
+            EncodedTerm::BigStringLiteral { value_id } => {
+                Ok(Literal::new_simple_literal(get_required_str(self.lookup, value_id)?).into())
+            }
+            EncodedTerm::SmallSmallLangStringLiteral { value, language } => {
+                Ok(Literal::new_language_tagged_literal_unchecked(*value, *language).into())
+            }
+            EncodedTerm::SmallBigLangStringLiteral { value, language_id } => {
+                Ok(Literal::new_language_tagged_literal_unchecked(
+                    *value,
+                    get_required_str(self.lookup, language_id)?,
+                )
+                .into())
+            }
+            EncodedTerm::BigSmallLangStringLiteral { value_id, language } => {
+                Ok(Literal::new_language_tagged_literal_unchecked(
+                    get_required_str(self.lookup, value_id)?,
+                    *language,
+                )
+                .into())
+            }
+            EncodedTerm::BigBigLangStringLiteral {
+                value_id,
+                language_id,
+            } => Ok(Literal::new_language_tagged_literal_unchecked(
+                get_required_str(self.lookup, value_id)?,
+                get_required_str(self.lookup, language_id)?,
+            )
+            .into()),
+            EncodedTerm::SmallTypedLiteral { value, datatype_id } => {
+                Ok(Literal::new_typed_literal(
+                    *value,
+                    NamedNode::new_unchecked(get_required_str(self.lookup, datatype_id)?),
+                )
+                .into())
+            }
+            EncodedTerm::BigTypedLiteral {
+                value_id,
+                datatype_id,
+            } => Ok(Literal::new_typed_literal(
+                get_required_str(self.lookup, value_id)?,
+                NamedNode::new_unchecked(get_required_str(self.lookup, datatype_id)?),
+            )
+            .into()),
+            EncodedTerm::BooleanLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::FloatLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::DoubleLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::IntegerLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::DecimalLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::DateTimeLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::DateLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::TimeLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::GYearMonthLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::GYearLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::GMonthDayLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::GDayLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::GMonthLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::DurationLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::YearMonthDurationLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::DayTimeDurationLiteral(value) => Ok(Literal::from(*value).into()),
+            EncodedTerm::Triple(triple) => Ok(self.decode_triple(triple)?.into()),
+        }
+    }
 
-    fn decode_subject(&self, encoded: &EncodedTerm) -> Result<Subject, StorageError> {
+    pub fn decode_subject(&self, encoded: &EncodedTerm) -> Result<Subject, StorageError> {
         match self.decode_term(encoded)? {
             Term::NamedNode(named_node) => Ok(named_node.into()),
             Term::BlankNode(blank_node) => Ok(blank_node.into()),
@@ -834,7 +892,7 @@ pub trait Decoder: StrLookup {
         }
     }
 
-    fn decode_named_or_blank_node(
+    pub fn decode_named_or_blank_node(
         &self,
         encoded: &EncodedTerm,
     ) -> Result<NamedOrBlankNode, StorageError> {
@@ -852,7 +910,7 @@ pub trait Decoder: StrLookup {
         }
     }
 
-    fn decode_named_node(&self, encoded: &EncodedTerm) -> Result<NamedNode, StorageError> {
+    pub fn decode_named_node(&self, encoded: &EncodedTerm) -> Result<NamedNode, StorageError> {
         match self.decode_term(encoded)? {
             Term::NamedNode(named_node) => Ok(named_node),
             Term::BlankNode(_) => Err(CorruptionError::msg(
@@ -868,7 +926,7 @@ pub trait Decoder: StrLookup {
         }
     }
 
-    fn decode_triple(&self, encoded: &EncodedTriple) -> Result<Triple, StorageError> {
+    pub fn decode_triple(&self, encoded: &EncodedTriple) -> Result<Triple, StorageError> {
         Ok(Triple::new(
             self.decode_subject(&encoded.subject)?,
             self.decode_named_node(&encoded.predicate)?,
@@ -876,7 +934,7 @@ pub trait Decoder: StrLookup {
         ))
     }
 
-    fn decode_quad(&self, encoded: &EncodedQuad) -> Result<Quad, StorageError> {
+    pub fn decode_quad(&self, encoded: &EncodedQuad) -> Result<Quad, StorageError> {
         Ok(Quad::new(
             self.decode_subject(&encoded.subject)?,
             self.decode_named_node(&encoded.predicate)?,
@@ -903,87 +961,6 @@ pub trait Decoder: StrLookup {
     }
 }
 
-impl<S: StrLookup> Decoder for S {
-    fn decode_term(&self, encoded: &EncodedTerm) -> Result<Term, StorageError> {
-        match encoded {
-            EncodedTerm::DefaultGraph => {
-                Err(CorruptionError::msg("The default graph tag is not a valid term").into())
-            }
-            EncodedTerm::NamedNode { iri_id } => {
-                Ok(NamedNode::new_unchecked(get_required_str(self, iri_id)?).into())
-            }
-            EncodedTerm::NumericalBlankNode { id } => Ok(BlankNode::new_from_unique_id(*id).into()),
-            EncodedTerm::SmallBlankNode(id) => Ok(BlankNode::new_unchecked(id.as_str()).into()),
-            EncodedTerm::BigBlankNode { id_id } => {
-                Ok(BlankNode::new_unchecked(get_required_str(self, id_id)?).into())
-            }
-            EncodedTerm::SmallStringLiteral(value) => {
-                Ok(Literal::new_simple_literal(*value).into())
-            }
-            EncodedTerm::BigStringLiteral { value_id } => {
-                Ok(Literal::new_simple_literal(get_required_str(self, value_id)?).into())
-            }
-            EncodedTerm::SmallSmallLangStringLiteral { value, language } => {
-                Ok(Literal::new_language_tagged_literal_unchecked(*value, *language).into())
-            }
-            EncodedTerm::SmallBigLangStringLiteral { value, language_id } => {
-                Ok(Literal::new_language_tagged_literal_unchecked(
-                    *value,
-                    get_required_str(self, language_id)?,
-                )
-                .into())
-            }
-            EncodedTerm::BigSmallLangStringLiteral { value_id, language } => {
-                Ok(Literal::new_language_tagged_literal_unchecked(
-                    get_required_str(self, value_id)?,
-                    *language,
-                )
-                .into())
-            }
-            EncodedTerm::BigBigLangStringLiteral {
-                value_id,
-                language_id,
-            } => Ok(Literal::new_language_tagged_literal_unchecked(
-                get_required_str(self, value_id)?,
-                get_required_str(self, language_id)?,
-            )
-            .into()),
-            EncodedTerm::SmallTypedLiteral { value, datatype_id } => {
-                Ok(Literal::new_typed_literal(
-                    *value,
-                    NamedNode::new_unchecked(get_required_str(self, datatype_id)?),
-                )
-                .into())
-            }
-            EncodedTerm::BigTypedLiteral {
-                value_id,
-                datatype_id,
-            } => Ok(Literal::new_typed_literal(
-                get_required_str(self, value_id)?,
-                NamedNode::new_unchecked(get_required_str(self, datatype_id)?),
-            )
-            .into()),
-            EncodedTerm::BooleanLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::FloatLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::DoubleLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::IntegerLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::DecimalLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::DateTimeLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::DateLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::TimeLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::GYearMonthLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::GYearLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::GMonthDayLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::GDayLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::GMonthLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::DurationLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::YearMonthDurationLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::DayTimeDurationLiteral(value) => Ok(Literal::from(*value).into()),
-            EncodedTerm::Triple(triple) => Ok(self.decode_triple(triple)?.into()),
-        }
-    }
-}
-
 fn get_required_str<L: StrLookup>(lookup: &L, id: &StrHash) -> Result<String, StorageError> {
     Ok(lookup.get_str(id)?.ok_or_else(|| {
         CorruptionError::new(format!(

lib/src/store.rs

@@ -32,7 +32,6 @@ use crate::sparql::{
     evaluate_query, evaluate_update, EvaluationError, Query, QueryOptions, QueryResults, Update,
     UpdateOptions,
 };
-use crate::storage::numeric_encoder::{Decoder, EncodedQuad, EncodedTerm};
 #[cfg(not(target_arch = "wasm32"))]
 use crate::storage::StorageBulkLoader;
 use crate::storage::{
@@ -184,12 +183,13 @@ impl Store {
         graph_name: Option<GraphNameRef<'_>>,
     ) -> QuadIter {
         let reader = self.storage.snapshot();
+        let encoder = reader.term_encoder();
         QuadIter {
             iter: reader.quads_for_pattern(
-                subject.map(EncodedTerm::from).as_ref(),
-                predicate.map(EncodedTerm::from).as_ref(),
-                object.map(EncodedTerm::from).as_ref(),
-                graph_name.map(EncodedTerm::from).as_ref(),
+                subject.map(|t| encoder.encode_term(t)).as_ref(),
+                predicate.map(|t| encoder.encode_term(t)).as_ref(),
+                object.map(|t| encoder.encode_term(t)).as_ref(),
+                graph_name.map(|t| encoder.encode_graph_name(t)).as_ref(),
             ),
             reader,
         }
@@ -236,8 +236,9 @@ impl Store {
     /// # Result::<_, Box<dyn std::error::Error>>::Ok(())
     /// ```
     pub fn contains<'a>(&self, quad: impl Into<QuadRef<'a>>) -> Result<bool, StorageError> {
-        let quad = EncodedQuad::from(quad.into());
-        self.storage.snapshot().contains(&quad)
+        let reader = self.storage.snapshot();
+        let quad = reader.term_encoder().encode_quad(quad);
+        reader.contains(&quad)
     }
 
     /// Returns the number of quads in the store.
@@ -611,8 +612,9 @@ impl Store {
         &self,
         graph_name: impl Into<NamedOrBlankNodeRef<'a>>,
     ) -> Result<bool, StorageError> {
-        let graph_name = EncodedTerm::from(graph_name.into());
-        self.storage.snapshot().contains_named_graph(&graph_name)
+        let reader = self.storage.snapshot();
+        let graph_name = reader.term_encoder().encode_graph_name(graph_name.into());
+        reader.contains_named_graph(&graph_name)
     }
 
     /// Inserts a graph into this store.
@@ -899,12 +901,13 @@ impl<'a> Transaction<'a> {
         graph_name: Option<GraphNameRef<'_>>,
     ) -> QuadIter {
         let reader = self.writer.reader();
+        let encoder = reader.term_encoder();
         QuadIter {
             iter: reader.quads_for_pattern(
-                subject.map(EncodedTerm::from).as_ref(),
-                predicate.map(EncodedTerm::from).as_ref(),
-                object.map(EncodedTerm::from).as_ref(),
-                graph_name.map(EncodedTerm::from).as_ref(),
+                subject.map(|t| encoder.encode_term(t)).as_ref(),
+                predicate.map(|t| encoder.encode_term(t)).as_ref(),
+                object.map(|t| encoder.encode_term(t)).as_ref(),
+                graph_name.map(|t| encoder.encode_graph_name(t)).as_ref(),
             ),
             reader,
         }
@@ -917,8 +920,9 @@ impl<'a> Transaction<'a> {
 
     /// Checks if this store contains a given quad.
     pub fn contains<'b>(&self, quad: impl Into<QuadRef<'b>>) -> Result<bool, StorageError> {
-        let quad = EncodedQuad::from(quad.into());
-        self.writer.reader().contains(&quad)
+        let reader = self.writer.reader();
+        let quad = reader.term_encoder().encode_quad(quad);
+        reader.contains(&quad)
     }
 
     /// Returns the number of quads in the store.
@@ -1125,9 +1129,9 @@ impl<'a> Transaction<'a> {
         &self,
         graph_name: impl Into<NamedOrBlankNodeRef<'b>>,
     ) -> Result<bool, StorageError> {
-        self.writer
-            .reader()
-            .contains_named_graph(&EncodedTerm::from(graph_name.into()))
+        let reader = self.writer.reader();
+        let graph_name = reader.term_encoder().encode_graph_name(graph_name.into());
+        reader.contains_named_graph(&graph_name)
     }
 
     /// Inserts a graph into this store.
@@ -1238,7 +1242,7 @@ impl Iterator for QuadIter {
 
     fn next(&mut self) -> Option<Result<Quad, StorageError>> {
         Some(match self.iter.next()? {
-            Ok(quad) => self.reader.decode_quad(&quad),
+            Ok(quad) => self.reader.term_decoder().decode_quad(&quad),
             Err(error) => Err(error),
         })
     }
@@ -1254,11 +1258,11 @@ impl Iterator for GraphNameIter {
     type Item = Result<NamedOrBlankNode, StorageError>;
 
     fn next(&mut self) -> Option<Result<NamedOrBlankNode, StorageError>> {
-        Some(
-            self.iter
-                .next()?
-                .and_then(|graph_name| self.reader.decode_named_or_blank_node(&graph_name)),
-        )
+        Some(self.iter.next()?.and_then(|graph_name| {
+            self.reader
+                .term_decoder()
+                .decode_named_or_blank_node(&graph_name)
+        }))
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {