/*
* 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.util;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import org.apache.jena.graph.Node;
import org.apache.jena.graph.Triple;
import org.apache.jena.sparql.core.* ;
public class VarUtils {
public static Set<Var> getVars(Triple triple) {
Set<Var> x = new HashSet<>();
addVarsFromTriple(x, triple);
return x;
}
public static void addVarsFromTriple(Collection<Var> acc, Triple triple) {
addVar(acc, triple.getSubject());
addVar(acc, triple.getPredicate());
addVar(acc, triple.getObject());
}
public static void addVarsFromQuad(Collection<Var> acc, Quad quad) {
addVar(acc, quad.getGraph());
addVar(acc, quad.getSubject());
addVar(acc, quad.getPredicate());
addVar(acc, quad.getObject());
}
public static void addVarsFromTriplePath(Collection<Var> acc, TriplePath tpath) {
addVar(acc, tpath.getSubject());
addVar(acc, tpath.getObject());
}
public static void addVar(Collection<Var> acc, Node n) {
if ( n == null )
return;
if ( n.isVariable() )
acc.add(Var.alloc(n));
}
// Name to avoid erasure clash
public static void addVarNodes(Collection<Var> acc, Collection<Node> nodes) {
if ( nodes == null )
return ;
for ( Node n : nodes )
addVar(acc, n) ;
}
public static void addVarsTriples(Collection<Var> acc, Collection<Triple> triples) {
for ( Triple triple : triples )
addVarsFromTriple(acc, triple);
}
public static void addVars(Collection<Var> acc, BasicPattern pattern) {
addVarsTriples(acc, pattern.getList());
}
public static void addVars(Collection<Var> acc, Node graphNode, BasicPattern triples) {
addVar(acc, graphNode) ;
addVars(acc, triples) ;
}
public static void addVars(Collection<Var> acc, QuadPattern quadPattern) {
for ( Quad quad : quadPattern.getList() ) {
addVarsFromQuad(acc, quad) ;
}
}
}