/**
* 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.core;
import java.util.Collection ;
import org.apache.jena.graph.Node ;
import org.apache.jena.graph.Triple ;
/** Useful operations involving Var */
public class Vars {
public static void addVarsFromTriple(Collection<Var> acc, Triple t) {
addVar(acc, t.getSubject()) ;
addVar(acc, t.getPredicate()) ;
addVar(acc, t.getObject()) ;
}
public static void addVarsFromQuad(Collection<Var> acc, Quad q) {
addVar(acc, q.getSubject()) ;
addVar(acc, q.getPredicate()) ;
addVar(acc, q.getObject()) ;
addVar(acc, q.getGraph()) ;
}
public static void addVar(Collection<Var> acc, Node n) {
if (n == null)
return ;
if (n.isVariable())
acc.add(Var.alloc(n)) ;
}
}