/*
 * 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 org.apache.jena.ttl.turtle;

import org.apache.jena.graph.Graph ;
import org.apache.jena.graph.Node ;
import org.apache.jena.graph.Triple ;


public class TurtleRDFGraphInserter implements TurtleEventHandler
{
    Graph graph = null ;
    public TurtleRDFGraphInserter(Graph graph) { this.graph = graph ; }
    
    @Override
    public void triple(int line, int col, Triple triple)
    {
        //Check it's valid triple.
        Node s = triple.getSubject() ;
        Node p = triple.getPredicate() ;
        Node o = triple.getObject() ;
        
        if ( ! ( s.isURI() || s.isBlank() ) )
            throw new TurtleParseException("["+line+", "+col+"] : Error: Subject is not a URI or blank node") ;
        if ( ! p.isURI() )
            throw new TurtleParseException("["+line+", "+col+"] : Error: Predicate is not a URI") ;
        if ( ! ( o.isURI() || o.isBlank() || o.isLiteral() ) ) 
            throw new TurtleParseException("["+line+", "+col+"] : Error: Object is not a URI, blank node or literal") ;
        
        graph.add(triple) ;
    }

    @Override
    public void startFormula(int line, int col)
    { throw new TurtleParseException("["+line+", "+col+"] : Error: Formula found") ; }

    @Override
    public void endFormula(int line, int col)
    { throw new TurtleParseException("["+line+", "+col+"] : Error: Formula found") ; }

    @Override
    public void prefix(int line, int col, String prefix, String iri)
    { graph.getPrefixMapping().setNsPrefix(prefix, iri) ; }
}
