Simplifies data objects factory

src/model/data.rs

@@ -68,6 +68,39 @@ impl fmt::Display for BlankNode {
     }
 }
 
+/// An utility structure to generate bank node ids in a thread safe way
+#[derive(Debug)]
+struct U64IDProvider {
+    counter: Mutex<u64>,
+}
+
+impl U64IDProvider {
+    pub fn next(&self) -> u64 {
+        let mut id = self.counter.lock().unwrap();
+        *id += 1;
+        *id
+    }
+}
+
+impl Default for U64IDProvider {
+    fn default() -> Self {
+        U64IDProvider {
+            counter: Mutex::new(0),
+        }
+    }
+}
+
+lazy_static! {
+    static ref U64_ID_PROVIDER: U64IDProvider = U64IDProvider::default();
+}
+
+impl Default for BlankNode {
+    /// Builds a new RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a unique id
+    fn default() -> Self {
+        BlankNode::new(U64_ID_PROVIDER.next().to_string())
+    }
+}
+
 /// A RDF [literal](https://www.w3.org/TR/rdf11-concepts/#dfn-literal)
 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 pub enum Literal {
@@ -86,6 +119,30 @@ lazy_static! {
 }
 
 impl Literal {
+    /// Builds a RDF [simple literal](https://www.w3.org/TR/rdf11-concepts/#dfn-simple-literal)
+    pub fn new_simple_literal(value: impl Into<String>) -> Self {
+        Literal::SimpleLiteral(value.into())
+    }
+
+    /// Builds a RDF [literal](https://www.w3.org/TR/rdf11-concepts/#dfn-literal) with a [datatype](https://www.w3.org/TR/rdf11-concepts/#dfn-datatype-iri)
+    pub fn new_typed_literal(value: impl Into<String>, datatype: impl Into<NamedNode>) -> Self {
+        Literal::TypedLiteral {
+            value: value.into(),
+            datatype: datatype.into(),
+        }
+    }
+
+    /// Builds a RDF [language-tagged string](https://www.w3.org/TR/rdf11-concepts/#dfn-language-tagged-string)
+    pub fn new_language_tagged_literal(
+        value: impl Into<String>,
+        language: impl Into<String>,
+    ) -> Self {
+        Literal::LanguageTaggedString {
+            value: value.into(),
+            language: language.into(),
+        }
+    }
+
     /// The literal [lexical form](https://www.w3.org/TR/rdf11-concepts/#dfn-lexical-form)
     pub fn value(&self) -> &str {
         match self {
@@ -453,86 +510,3 @@ impl QuadLike for Quad {
         return self.graph_name;
     }
 }
-
-/// An utility structure to generate bank node ids in a thread safe way
-#[derive(Debug, Clone)]
-struct U64IDProvider {
-    counter: Arc<Mutex<u64>>,
-}
-
-impl U64IDProvider {
-    pub fn next(&self) -> u64 {
-        let mut id = self.counter.lock().unwrap();
-        *id += 1;
-        *id
-    }
-}
-
-impl Default for U64IDProvider {
-    fn default() -> Self {
-        U64IDProvider {
-            counter: Arc::new(Mutex::new(0)),
-        }
-    }
-}
-
-/// A structure creating RDF elements
-#[derive(Debug, Clone)]
-pub struct DataFactory {
-    blank_node_id_provider: U64IDProvider,
-}
-
-impl Default for DataFactory {
-    fn default() -> Self {
-        DataFactory {
-            blank_node_id_provider: U64IDProvider::default(),
-        }
-    }
-}
-
-impl DataFactory {
-    /// Builds a RDF [IRI](https://www.w3.org/TR/rdf11-concepts/#dfn-iri)
-    pub fn named_node(&self, iri: impl Into<Url>) -> NamedNode {
-        NamedNode::new(iri)
-    }
-
-    /// Builds a RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a known id
-    pub fn blank_node(&self, id: impl Into<String>) -> BlankNode {
-        BlankNode::new(id)
-    }
-
-    /// Builds a new RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a unique id
-    pub fn new_blank_node(&self) -> BlankNode {
-        BlankNode::new(self.blank_node_id_provider.next().to_string())
-    }
-
-    /// Builds a RDF [simple literal](https://www.w3.org/TR/rdf11-concepts/#dfn-simple-literal)
-    pub fn simple_literal(&self, value: impl Into<String>) -> Literal {
-        Literal::SimpleLiteral(value.into())
-    }
-
-    /// Builds a RDF [literal](https://www.w3.org/TR/rdf11-concepts/#dfn-literal) with a [datatype](https://www.w3.org/TR/rdf11-concepts/#dfn-datatype-iri)
-    pub fn typed_literal(
-        &self,
-        value: impl Into<String>,
-        datatype: impl Into<NamedNode>,
-    ) -> Literal {
-        //TODO: find the best representation
-        Literal::TypedLiteral {
-            value: value.into(),
-            datatype: datatype.into(),
-        }
-    }
-
-    /// Builds a RDF [language-tagged string](https://www.w3.org/TR/rdf11-concepts/#dfn-language-tagged-string)
-    pub fn language_tagged_literal(
-        &self,
-        value: impl Into<String>,
-        language: impl Into<String>,
-    ) -> Literal {
-        Literal::LanguageTaggedString {
-            value: value.into(),
-            language: language.into(),
-        }
-    }
-}

src/rio/ntriples/mod.rs

@@ -10,16 +10,12 @@ use std::io::BufRead;
 use std::io::BufReader;
 use std::io::Read;
 
-pub fn read_ntriples<'a, R: Read + 'a>(
-    source: R,
-    data_factory: &'a DataFactory,
-) -> impl Iterator<Item = RioResult<Triple>> {
-    let factory = data_factory.clone(); //TODO: try to avoid clone here
-                                        //TODO: use read_lines to avoid allocations
+pub fn read_ntriples<'a, R: Read + 'a>(source: R) -> impl Iterator<Item = RioResult<Triple>> {
+    //TODO: use read_lines to avoid allocations
     BufReader::new(source)
         .lines()
         .flat_map(move |line| match line {
-            Ok(line) => match grammar::triple(line.as_str(), &factory) {
+            Ok(line) => match grammar::triple(line.as_str()) {
                 Ok(triple) => Some(Ok(triple?)),
                 Err(error) => Some(Err(RioError::new(error))),
             },

src/rio/ntriples/ntriples_grammar.rustpeg

@@ -5,8 +5,6 @@ use std::char;
 use std::str::FromStr;
 use model::data::*;
 
-#![arguments(data_factory: &DataFactory)]
-
 //[2]
 #[pub]
 triple -> Option<Triple> =
@@ -31,8 +29,8 @@ object -> Term =
 
 //[6]
 literal -> Literal =
-    v: STRING_LITERAL_QUOTE _ "^^" _ t:IRIREF { data_factory.typed_literal(v, t) } /
-    v: STRING_LITERAL_QUOTE _ l:LANGTAG { data_factory.language_tagged_literal(v, l) } /
+    v: STRING_LITERAL_QUOTE _ "^^" _ t:IRIREF { Literal::new_typed_literal(v, t) } /
+    v: STRING_LITERAL_QUOTE _ l:LANGTAG { Literal::new_language_tagged_literal(v, l) } /
     v: STRING_LITERAL_QUOTE { v.into() }
 
 
@@ -62,7 +60,7 @@ STRING_LITERAL_QUOTE_simple_char -> char = c: $([^\u{0022}\u{005c}\u{000a}\u{000
 
 //[141s]
 BLANK_NODE_LABEL -> BlankNode = "_:" b:$(([0-9] / PN_CHARS_U) PN_CHARS* ("."+ PN_CHARS+)*) {
-    data_factory.blank_node(b)
+    BlankNode::new(b)
 }
 
 //[10]

src/rio/turtle/mod.rs

@@ -28,10 +28,8 @@ impl ParserState {
 
 pub fn read_turtle<'a, R: Read + 'a>(
     source: R,
-    data_factory: &'a DataFactory,
     base_uri: impl Into<Option<Url>>,
 ) -> RioResult<impl Iterator<Item = Triple>> {
-    let factory = data_factory.clone(); //TODO: try to avoid clone here
     let mut state = ParserState {
         base_uri: base_uri.into(),
         namespaces: HashMap::default(),
@@ -41,8 +39,7 @@ pub fn read_turtle<'a, R: Read + 'a>(
     let mut string_buffer = String::default();
     let mut triple_buffer = Vec::default();
     match BufReader::new(source).read_to_string(&mut string_buffer) {
-        Ok(_) => match grammar::turtleDoc(&string_buffer, &mut state, &mut triple_buffer, &factory)
-        {
+        Ok(_) => match grammar::turtleDoc(&string_buffer, &mut state, &mut triple_buffer) {
             Ok(_) => Ok(triple_buffer.into_iter()),
             Err(error) => Err(RioError::new(error)),
         },

src/rio/turtle/turtle_grammar.rustpeg

@@ -8,7 +8,7 @@ use model::vocab::xsd;
 use std::iter;
 use rio::turtle::ParserState;
 
-#![arguments(state: &mut ParserState, buffer: &mut Vec<Triple>, data_factory: &DataFactory)]
+#![arguments(state: &mut ParserState, buffer: &mut Vec<Triple>)]
 
 //[1]
 #[pub]
@@ -112,14 +112,14 @@ blankNodePropertyList -> NamedOrBlankNode = blankNodePropertyList_open _ predica
     state.cur_subject.pop().ok_or("No subject found in the stack")
 }
 blankNodePropertyList_open -> () = "[" {
-    state.cur_subject.push(data_factory.new_blank_node().into())
+    state.cur_subject.push(BlankNode::default().into())
 }
 
 //[15]
 collection -> NamedOrBlankNode = '(' _ o:(collection_value*) ')' {
     let mut current_list_node = NamedOrBlankNode::from(rdf::NIL.clone());
     for obj in o.into_iter().rev() {
-        let new_blank_node = NamedOrBlankNode::from(data_factory.new_blank_node());
+        let new_blank_node = NamedOrBlankNode::from(BlankNode::default());
         buffer.push(Triple::new(new_blank_node.clone(), rdf::FIRST.clone(), obj));
         buffer.push(Triple::new(new_blank_node.clone(), rdf::REST.clone(), current_list_node));
         current_list_node = new_blank_node;
@@ -130,14 +130,14 @@ collection_value -> Term = o:object_value _ { o }
 
 //[16]
 NumericLiteral -> Literal =
-    d:$(DOUBLE) { data_factory.typed_literal(d, xsd::DOUBLE.clone()) } /
-    d:$(DECIMAL) { data_factory.typed_literal(d, xsd::DECIMAL.clone()) } /
-    i:$(INTEGER) { data_factory.typed_literal(i, xsd::INTEGER.clone()) }
+    d:$(DOUBLE) { Literal::new_typed_literal(d, xsd::DOUBLE.clone()) } /
+    d:$(DECIMAL) { Literal::new_typed_literal(d, xsd::DECIMAL.clone()) } /
+    i:$(INTEGER) { Literal::new_typed_literal(i, xsd::INTEGER.clone()) }
 
 //[128s]
 RDFLiteral -> Literal =
-    v:String _ "^^" _ t:iri { data_factory.typed_literal(v, t) } /
-    v:String _ l:LANGTAG { data_factory.language_tagged_literal(v, l) } /
+    v:String _ "^^" _ t:iri { Literal::new_typed_literal(v, t) } /
+    v:String _ l:LANGTAG { Literal::new_language_tagged_literal(v, l) } /
     v:String { v.into() }
 
 //[133s]
@@ -151,7 +151,7 @@ String -> String = STRING_LITERAL_LONG_SINGLE_QUOTE / STRING_LITERAL_LONG_QUOTE
 //[135s]
 iri -> NamedNode = i:(IRIREF / PrefixedName) {?
     match state.url_parser().parse(&i) {
-       Ok(url) => Ok(data_factory.named_node(url)),
+       Ok(url) => Ok(NamedNode::new(url)),
        Err(error) => Err("IRI parsing failed")
     }
 }
@@ -162,8 +162,8 @@ PrefixedName -> String = PNAME_LN /
 
 //[137s]
 BlankNode -> BlankNode =
-    b:BLANK_NODE_LABEL { data_factory.blank_node(b) } /
-    ANON { data_factory.new_blank_node() }
+    b:BLANK_NODE_LABEL { BlankNode::new(b) } /
+    ANON { BlankNode::default() }
 
 //[18]
 IRIREF -> String = "<" i:((_IRIREF_simple_char / UCHAR)*) ">" {

tests/rdf_test_cases.rs

@@ -1,29 +1,27 @@
-#[macro_use]
-extern crate lazy_static;
 extern crate reqwest;
 extern crate rudf;
 extern crate url;
 
 use reqwest::Client;
 use rudf::model::data::*;
+use rudf::model::vocab::rdf;
 use rudf::rio::RioError;
 use rudf::rio::RioResult;
 use rudf::rio::ntriples::read_ntriples;
 use rudf::rio::turtle::read_turtle;
 use std::collections::HashSet;
 use std::iter::FromIterator;
+use std::str::FromStr;
 use url::Url;
 
 struct RDFClient {
     client: Client,
-    data_factory: DataFactory,
 }
 
 impl Default for RDFClient {
     fn default() -> Self {
         Self {
             client: Client::new(),
-            data_factory: DataFactory::default(),
         }
     }
 }
@@ -31,18 +29,14 @@ impl Default for RDFClient {
 impl RDFClient {
     fn load_turtle(&self, uri: Url) -> RioResult<HashSet<Triple>> {
         match self.client.get(uri.clone()).send() {
-            Ok(response) => Ok(HashSet::from_iter(read_turtle(
-                response,
-                &self.data_factory,
-                Some(uri),
-            )?)),
+            Ok(response) => Ok(HashSet::from_iter(read_turtle(response, Some(uri))?)),
             Err(error) => Err(RioError::new(error)),
         }
     }
 
     fn load_ntriples(&self, uri: Url) -> RioResult<HashSet<Triple>> {
         match self.client.get(uri).send() {
-            Ok(response) => read_ntriples(response, &self.data_factory).collect(),
+            Ok(response) => read_ntriples(response).collect(),
             Err(error) => Err(RioError::new(error)),
         }
     }
@@ -89,27 +83,21 @@ fn subject_for_predicate_object<'a>(
 #[test]
 fn turtle_w3c_testsuite() {
     let client = RDFClient::default();
-    let data_factory = &client.data_factory;
     let manifest = client
         .load_turtle(Url::parse("https://www.w3.org/2013/TurtleTests/manifest.ttl").unwrap())
         .unwrap();
-    let rdf_type = data_factory
-        .named_node(Url::parse("http://www.w3.org/1999/02/22-rdf-syntax-ns#type").unwrap());
-    let mf_action = data_factory.named_node(
-        Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#action").unwrap(),
+    let mf_action = NamedNode::from_str(
+        "http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#action",
+    ).unwrap();
+    let rdfs_comment = NamedNode::from_str("http://www.w3.org/2000/01/rdf-schema#comment").unwrap();
+    let rdft_test_turtle_positive_syntax = Term::from(
+        NamedNode::from_str("http://www.w3.org/ns/rdftest#TestTurtlePositiveSyntax").unwrap(),
+    );
+    let rdft_test_turtle_negative_syntax = Term::from(
+        NamedNode::from_str("http://www.w3.org/ns/rdftest#TestTurtleNegativeSyntax").unwrap(),
     );
-    let rdfs_comment = data_factory
-        .named_node(Url::parse("http://www.w3.org/2000/01/rdf-schema#comment").unwrap());
-    let rdft_test_turtle_positive_syntax =
-        Term::from(data_factory.named_node(
-            Url::parse("http://www.w3.org/ns/rdftest#TestTurtlePositiveSyntax").unwrap(),
-        ));
-    let rdft_test_turtle_negative_syntax =
-        Term::from(data_factory.named_node(
-            Url::parse("http://www.w3.org/ns/rdftest#TestTurtleNegativeSyntax").unwrap(),
-        ));
 
-    subjects_for_predicate_object(&manifest, &rdf_type, &rdft_test_turtle_positive_syntax)
+    subjects_for_predicate_object(&manifest, &rdf::TYPE, &rdft_test_turtle_positive_syntax)
         .for_each(|test| {
             let comment = object_for_subject_predicate(&manifest, test, &rdfs_comment).unwrap();
             if let Some(Term::NamedNode(file)) =
@@ -124,7 +112,7 @@ fn turtle_w3c_testsuite() {
                 }
             }
         });
-    subjects_for_predicate_object(&manifest, &rdf_type, &rdft_test_turtle_negative_syntax)
+    subjects_for_predicate_object(&manifest, &rdf::TYPE, &rdft_test_turtle_negative_syntax)
         .for_each(|test| {
             let comment = object_for_subject_predicate(&manifest, test, &rdfs_comment).unwrap();
             if let Some(Term::NamedNode(file)) =
@@ -143,25 +131,21 @@ fn turtle_w3c_testsuite() {
 #[test]
 fn ntriples_w3c_testsuite() {
     let client = RDFClient::default();
-    let data_factory = &client.data_factory;
     let manifest = client
         .load_turtle(Url::parse("https://www.w3.org/2013/N-TriplesTests/manifest.ttl").unwrap())
         .unwrap();
-    let rdf_type = data_factory
-        .named_node(Url::parse("http://www.w3.org/1999/02/22-rdf-syntax-ns#type").unwrap());
-    let mf_action = data_factory.named_node(
-        Url::parse("http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#action").unwrap(),
+    let mf_action = NamedNode::from_str(
+        "http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#action",
+    ).unwrap();
+    let rdfs_comment = NamedNode::from_str("http://www.w3.org/2000/01/rdf-schema#comment").unwrap();
+    let rdft_test_ntriples_positive_syntax = Term::from(
+        NamedNode::from_str("http://www.w3.org/ns/rdftest#TestNTriplesPositiveSyntax").unwrap(),
+    );
+    let rdft_test_ntriples_negative_syntax = Term::from(
+        NamedNode::from_str("http://www.w3.org/ns/rdftest#TestNTriplesNegativeSyntax").unwrap(),
     );
-    let rdfs_comment = data_factory
-        .named_node(Url::parse("http://www.w3.org/2000/01/rdf-schema#comment").unwrap());
-    let rdft_test_turtle_positive_syntax = Term::from(data_factory.named_node(
-        Url::parse("http://www.w3.org/ns/rdftest#TestNTriplesPositiveSyntax").unwrap(),
-    ));
-    let rdft_test_turtle_negative_syntax = Term::from(data_factory.named_node(
-        Url::parse("http://www.w3.org/ns/rdftest#TestNTriplesNegativeSyntax").unwrap(),
-    ));
 
-    subjects_for_predicate_object(&manifest, &rdf_type, &rdft_test_turtle_positive_syntax)
+    subjects_for_predicate_object(&manifest, &rdf::TYPE, &rdft_test_ntriples_positive_syntax)
         .for_each(|test| {
             let comment = object_for_subject_predicate(&manifest, test, &rdfs_comment).unwrap();
             if let Some(Term::NamedNode(file)) =
@@ -176,7 +160,7 @@ fn ntriples_w3c_testsuite() {
                 }
             }
         });
-    subjects_for_predicate_object(&manifest, &rdf_type, &rdft_test_turtle_negative_syntax)
+    subjects_for_predicate_object(&manifest, &rdf::TYPE, &rdft_test_ntriples_negative_syntax)
         .for_each(|test| {
             let comment = object_for_subject_predicate(&manifest, test, &rdfs_comment).unwrap();
             if let Some(Term::NamedNode(file)) =