changeset 365:25513e53e909

+ RDB2RDF2RDF using SPARQL Construct rewritting
author Alexandre Bertails <bertails@w3.org>
date Fri, 18 Mar 2011 18:37:43 -0400
parents 4098449a4008
children 242b3c1e0944
files rdf2rdf/src/main/scala/RDF2RDF.scala rdf2rdf/src/test/scala/RDF2RDFTest.scala
diffstat 2 files changed, 93 insertions(+), 23 deletions(-) [+]
line wrap: on
line diff
--- a/rdf2rdf/src/main/scala/RDF2RDF.scala	Tue Mar 15 11:58:27 2011 -0400
+++ b/rdf2rdf/src/main/scala/RDF2RDF.scala	Fri Mar 18 18:37:43 2011 -0400
@@ -4,15 +4,20 @@
 import com.hp.hpl.jena.query._
 import com.hp.hpl.jena.rdf.model._
 
+object RDF2RDFModule {
+  val base = "dm:"
+}
+
+import RDF2RDFModule._
+
 trait RDF2RDFModule extends JenaModel {
 
   case class Construct(query:Query) {
     assert(query.getQueryType == Query.QueryTypeConstruct, "You must provide a valid SPARQL 1.1 Construct query")
-      
   }
 
   object Construct {
-    def apply(query:String, base:String = null):Construct = {
+    def apply(query:String, base:String = base):Construct = {
       val construct = QueryFactory.create(query, base, Syntax.syntaxSPARQL_11)
       Construct(construct)
     }
@@ -21,11 +26,22 @@
 
   case class RDF2RDF(graph:Graph) {
 
+    val model = {
+      val m1 = ModelFactory.createModelForGraph(graph.jenaGraph)
+      val buffer = new java.io.ByteArrayOutputStream
+      m1.write(buffer, "TURTLE", base)
+      // m1.write(System.out, "TURTLE", base)
+      val m2 = ModelFactory.createDefaultModel()
+      m2.read(new java.io.StringReader(buffer.toString("UTF-8")), base, "TURTLE")
+      // m2.write(System.out, "TURTLE", null)
+      m2
+    }
+
     def | (construct:Construct):Graph = {
-      val model = ModelFactory.createModelForGraph(graph.jenaGraph)
       val qe = QueryExecutionFactory.create(construct.query, model)
       val resultModel = qe.execConstruct
-      new Graph(resultModel.getGraph)
+      val g1 = new Graph(resultModel.getGraph)
+      g1
     }
 
   }
@@ -34,4 +50,59 @@
     implicit def graph2RDF2RDF(graph:Graph):RDF2RDF = RDF2RDF(graph)
   }
 
+  import com.hp.hpl.jena.rdf.model._
+
+  def getGraph(s:String, base:String = null):Graph = {
+    val model = ModelFactory.createDefaultModel()
+    model.read(new java.io.StringReader(s), base, "TURTLE")
+    return new Graph(model.getGraph)
+  }
+
+  def dumpCutingBase(g:Graph):Unit = {
+    val model = ModelFactory.createModelForGraph(g.jenaGraph)
+    val buffer = new java.io.ByteArrayOutputStream
+    model.write(buffer, "TURTLE", base)
+    val result = buffer.toString("UTF-8").replaceAll("<"+base, "<")
+    println(result)
+  }
+
 }
+
+
+object Main {
+
+  import com.hp.hpl.jena.rdf.model._
+
+  def main(args: Array[String]): Unit = {
+
+    val turtleString = """
+<a> <b> <c> .
+"""
+
+    val queryString = """
+CONSTRUCT {
+  <otherA> ?p <otherC>
+} WHERE {
+  <a> ?p <c>
+}
+"""
+
+    val base = "/"
+
+    val model:Model = ModelFactory.createDefaultModel()
+    model.read(new java.io.StringReader(turtleString), base, "TURTLE")
+    // val s = model.createResource("a")
+    // val p = model.createResource("b")
+    // val o = model.createResource("c")
+    // val statement = model.create
+    model.write(System.out, "TURTLE", base)
+
+    val query:Query = QueryFactory.create(queryString, base)
+    val qexec:QueryExecution = QueryExecutionFactory.create(query, model)
+    val resultModel:Model = qexec.execConstruct()
+
+    resultModel.write(System.out, "TURTLE", base)
+
+  }
+
+}
--- a/rdf2rdf/src/test/scala/RDF2RDFTest.scala	Tue Mar 15 11:58:27 2011 -0400
+++ b/rdf2rdf/src/test/scala/RDF2RDFTest.scala	Fri Mar 18 18:37:43 2011 -0400
@@ -5,24 +5,11 @@
 import org.w3.rdf.jena._
 import org.w3.directmapping._
 
-trait Util extends JenaModel {
-
-  // TODO move that elsewhere
-  def getGraph(s:String, base:String = null):Graph = {
-    import com.hp.hpl.jena.rdf.model._
-    val model = ModelFactory.createDefaultModel()
-    model.read(new java.io.StringReader(s), base, "TURTLE")
-    return new Graph(model.getGraph)
-  }
-
-}
-
-class RDF2RDFTest extends FunSuite with ShouldMatchers with RDF2RDFModule with Util {
+class RDF2RDFTest extends FunSuite with ShouldMatchers with RDF2RDFModule {
 
   test("http://ivan-herman.name/2010/11/19/my-first-mapping-from-direct-mapping/") {
 
     val graph = getGraph("""
-@base <http://book.example/> .
 <Book/ID=0006511409X#_> a <Book> ;
   <Book#ISBN> "0006511409X" ;
   <Book#Title> "The Glass Palace" ;
@@ -33,7 +20,7 @@
   <Author#ID> "id_xyz" ;
   <Author#Name> "Ghosh, Amitav" ;
   <Author#Homepage> "http://www.amitavghosh.com" .
-""")
+""", base="http://book.example/")
 
 
     val construct = Construct("""
@@ -66,13 +53,12 @@
     val resultGraph = RDF2RDF(graph) | construct
 
     val expectedGraph = getGraph("""
-@base <http://ivan.book.example/> .
 <0006511409X> <title> "The Glass Palace" ;
               <year>  "2000" ;
               <author> _:y .
 _:y <name> "Ghosh, Amitav" ;
     <homepage> <http://www.amitavghosh.com> .
-""")
+""", base="http://ivan.book.example/")
 
     assert(expectedGraph === resultGraph)
 
@@ -84,7 +70,7 @@
 import org.w3.sql
 import org.w3.rdf.turtle.TurtleModule
 
-class RDB2RDF2RDFTest extends FunSuite with ShouldMatchers with RDF2RDFModule with DirectMappingModule with Util with TurtleModule {
+class RDB2RDF2RDFTest extends FunSuite with ShouldMatchers with RDF2RDFModule with DirectMappingModule with TurtleModule {
 
   import DirectMapping._
 
@@ -112,8 +98,21 @@
 
     val graph = databaseSemantics(db)
 
-    println(graph)
+    val construct = Construct("""
+CONSTRUCT {
+  ?s <p> ?o
+} WHERE {
+  ?s <Address#ID> ?o
+}
+""")
+
+    println(construct)
+
+    val resultGraph = RDF2RDF(graph) | construct
+
+    dumpCutingBase(resultGraph)
 
   }
 
 }
+
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