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ARQ is a SPARQL 1.1 query engine for Apache Jena
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/*
 * 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.sparql.graph;

import org.apache.jena.datatypes.RDFDatatype ;
import org.apache.jena.datatypes.xsd.XSDDatatype ;
import org.apache.jena.graph.Node ;
import org.apache.jena.graph.NodeFactory ;
import org.apache.jena.vocabulary.OWL ;
import org.apache.jena.vocabulary.RDF ;

/** Some node constants */
public class NodeConst
{
    private static Node literal(String lex, RDFDatatype dt) {
        return NodeFactory.createLiteral(lex, dt) ;
    }
    
    private static Node uri(String uriStr) {
        return NodeFactory.createURI(uriStr) ;
    }
    
    public static final Node nodeTrue       = literal("true",  XSDDatatype.XSDboolean) ; 
    public static final Node nodeFalse      = literal("false", XSDDatatype.XSDboolean) ; 
    public static final Node nodeZero       = literal("0",     XSDDatatype.XSDinteger) ;
    public static final Node nodeOne        = literal("1",     XSDDatatype.XSDinteger) ;
    public static final Node nodeTwo        = literal("2",     XSDDatatype.XSDinteger) ;
    public static final Node nodeTen        = literal("10",    XSDDatatype.XSDinteger) ;
    public static final Node nodeMinusOne   = literal("-1",    XSDDatatype.XSDinteger) ;
    public static final Node emptyString    = NodeFactory.createLiteral("") ;
    
    // It should be safe to use RDF.Nodes.
    // Falback code "just in case"
    public static final Node nodeRDFType    = RDF.Nodes.type ;  //uri(RDF.uri+"type") ;
    public static final Node nodeFirst      = RDF.Nodes.first ; //uri(RDF.uri+"first") ;
    public static final Node nodeRest       = RDF.Nodes.rest ;  //uri(RDF.uri+"rest") ;
    public static final Node nodeNil        = RDF.Nodes.nil;    //uri(RDF.uri+"nil") ;
    public static final Node nodeANY        = Node.ANY ;
    
    public static final Node nodeOwlSameAs          = OWL.sameAs.asNode() ; //NodeFactory.createURI("http://www.w3.org/2002/07/owl#sameAs") ;
    public static final Node rdfLangString          = RDF.Nodes.langString ;
    public static final RDFDatatype dtLangString    = RDF.dtLangString ;
}