package org.apache.clerezza.rdf.core.impl.graphmatching;
/*
*
* 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.
*
*/
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.apache.clerezza.rdf.core.BNode;
import org.apache.clerezza.rdf.core.Triple;
public class Utils {
static Set<BNode> getBNodes(Collection<Triple> s) {
Set<BNode> result = new HashSet<BNode>();
for (Triple triple : s) {
if (triple.getSubject() instanceof BNode) {
result.add((BNode) triple.getSubject());
}
if (triple.getObject() instanceof BNode) {
result.add((BNode) triple.getObject());
}
}
return result;
}
/**
* removes the common grounded triples from s1 and s2. returns false if
* a grounded triple is not in both sets, true otherwise
*/
static boolean removeGrounded(Collection<Triple> s1, Collection<Triple> s2) {
Iterator<Triple> triplesIter = s1.iterator();
while (triplesIter.hasNext()) {
Triple triple = triplesIter.next();
if (!isGrounded(triple)) {
continue;
}
if (!s2.remove(triple)) {
return false;
}
triplesIter.remove();
}
//for efficiency we might skip this (redefine method)
for (Triple triple : s2) {
if (isGrounded(triple)) {
return false;
}
}
return true;
}
private static boolean isGrounded(Triple triple) {
if (triple.getSubject() instanceof BNode) {
return false;
}
if (triple.getObject() instanceof BNode) {
return false;
}
return true;
}
}