/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.sparql.core.assembler;
import com.hp.hpl.jena.assembler.Assembler ;
import com.hp.hpl.jena.assembler.JA ;
import com.hp.hpl.jena.assembler.assemblers.AssemblerGroup ;
import com.hp.hpl.jena.query.* ;
import com.hp.hpl.jena.rdf.model.Model ;
import com.hp.hpl.jena.rdf.model.Resource ;
import com.hp.hpl.jena.rdf.model.ResourceFactory ;
import com.hp.hpl.jena.shared.PrefixMapping ;
import com.hp.hpl.jena.sparql.ARQException ;
import com.hp.hpl.jena.sparql.mgt.Explain.InfoLevel ;
import com.hp.hpl.jena.sparql.util.Context ;
import com.hp.hpl.jena.sparql.util.MappingRegistry ;
import com.hp.hpl.jena.sparql.util.Symbol ;
import com.hp.hpl.jena.sparql.util.TypeNotUniqueException ;
import com.hp.hpl.jena.sparql.util.graph.GraphUtils ;
import com.hp.hpl.jena.util.FileManager ;
public class AssemblerUtils
{
// Wrappers for reading things form a file - assumes one of the thing per file.
public static PrefixMapping readPrefixMapping(String file)
{
PrefixMapping pm = (PrefixMapping)AssemblerUtils.build(file, JA.PrefixMapping) ;
return pm ;
}
private static boolean initialized = false ;
static { ARQ.init(); init() ; }
static public void init()
{
if ( initialized )
return ;
initialized = true ;
// Wire in the extension assemblers (extensions relative to the Jena assembler framework)
registerWith(Assembler.general) ;
}
static public void registerWith(AssemblerGroup g)
{
// Wire in the extension assemblers (extensions relative to the Jena assembler framework)
g.implementWith(DatasetAssembler.getType(), new DatasetAssembler()) ;
g.implementWith(GraphStoreAssembler.getType(), new GraphStoreAssembler()) ;
g.implementWith(DatasetNullAssembler.getType(), new DatasetNullAssembler()) ;
}
private static void assemblerClass(AssemblerGroup g, Resource r, Assembler a)
{
g.implementWith(r, a) ;
}
public static Object build(String assemblerFile, String typeURI)
{
Resource type = ResourceFactory.createResource(typeURI) ;
return build(assemblerFile, type) ;
}
public static Object build(String assemblerFile, Resource type)
{
if ( assemblerFile == null )
throw new ARQException("No assembler file") ;
Model spec = null ;
try {
spec = FileManager.get().loadModel(assemblerFile) ;
} catch (Exception ex)
{ throw new ARQException("Failed reading assembler description: "+ex.getMessage()) ; }
Resource root = null ;
InfoLevel level = ARQ.getExecutionLogging() ;
ARQ.setExecutionLogging(InfoLevel.NONE) ;
try {
root = GraphUtils.findRootByType(spec, type) ;
if ( root == null )
return null ;
} catch (TypeNotUniqueException ex)
{ throw new ARQException("Multiple types for: "+DatasetAssemblerVocab.tDataset) ; }
finally
{ ARQ.setExecutionLogging(level) ; }
return Assembler.general.open(root) ;
}
public static void setContext(Resource r, Context context)
{
String qs = "PREFIX ja: <"+JA.getURI()+">\nSELECT * { ?x ja:context [ ja:cxtName ?name ; ja:cxtValue ?value ] }" ;
QuerySolutionMap qsm = new QuerySolutionMap() ;
qsm.add("x", r) ;
QueryExecution qExec = QueryExecutionFactory.create(qs, r.getModel(), qsm) ;
ResultSet rs = qExec.execSelect() ;
while ( rs.hasNext() )
{
QuerySolution soln = rs.next() ;
String name = soln.getLiteral("name").getLexicalForm() ;
String value = soln.getLiteral("value").getLexicalForm() ; // Works for numbers as well!
name = MappingRegistry.mapPrefixName(name) ;
Symbol symbol = Symbol.create(name) ;
if ( "undef".equalsIgnoreCase(value) )
context.remove(symbol) ;
else
context.set(symbol, value) ;
}
}
}