org.coode.owlapi.rdf.model.RDFGraph Maven / Gradle / Ivy
/*
* This file is part of the OWL API.
*
* The contents of this file are subject to the LGPL License, Version 3.0.
*
* Copyright (C) 2011, The University of Manchester
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
*
* Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
* in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
*
* Copyright 2011, University of Manchester
*
* Licensed 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.coode.owlapi.rdf.model;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.coode.owlapi.rdf.renderer.RDFRendererBase;
import org.semanticweb.owlapi.io.RDFResource;
import org.semanticweb.owlapi.io.RDFResourceBlankNode;
import org.semanticweb.owlapi.io.RDFTriple;
import org.semanticweb.owlapi.io.RDFNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Author: Matthew Horridge
* The University Of Manchester
* Bio-Health Informatics Group
* Date: 06-Dec-2006
*
*/
public class RDFGraph {
private static final Logger logger = LoggerFactory.getLogger(RDFGraph.class);
private Map> triplesBySubject;
private Set rootAnonymousNodes;
private Set triples;
@SuppressWarnings("javadoc")
public RDFGraph() {
triples = new HashSet();
triplesBySubject = new HashMap>();
rootAnonymousNodes = null;
}
/** Determines if this graph is empty (i.e. whether or not it contains any
* triples).
*
* @return true if the graph contains triples, otherwise
* false
* @since 3.5 */
public boolean isEmpty() {
return triples.isEmpty();
}
/** @param triple
* triple to add */
public void addTriple(RDFTriple triple) {
// Reset the computation of root anon nodes
rootAnonymousNodes = null;
triples.add(triple);
Set tripleSet = triplesBySubject.get(triple.getSubject());
if (tripleSet == null) {
tripleSet = new HashSet();
triplesBySubject.put(triple.getSubject(), tripleSet);
}
tripleSet.add(triple);
}
/** @param subject
* node to search
* @return triples which have subject as subject
* @deprecated this method makes a defensive copy for each element in the
* map, but most uses of this only iterate over the results. Use
* getSortedTriplesForResult instead */
@Deprecated
public Set getTriplesForSubject(RDFResource subject) {
if (triplesBySubject.containsKey(subject)) {
return new HashSet(triplesBySubject.get(subject));
} else {
return Collections.emptySet();
}
}
/** @param subject
* @param sort
* @return sorted triples */
public List getSortedTriplesForSubject(RDFNode subject, boolean sort) {
List toReturn = new ArrayList();
Set set = triplesBySubject.get(subject);
if (set != null) {
toReturn.addAll(set);
}
if (sort) {
try {
Collections.sort(toReturn);
} catch (IllegalArgumentException e) {
// catch possible sorting misbehaviour
if (!e.getMessage().contains(
"Comparison method violates its general contract!")) {
throw e;
}
// otherwise print a warning and leave the list unsorted
logger.warn(
"Misbehaving triple comparator, leaving triples unsorted: {}",
toReturn, e);
}
}
return toReturn;
}
/**
* @param node node to search
* @return true if the anon node is shared
*/
public boolean isAnonymousNodeSharedSubject(RDFResourceBlankNode node) {
if(!node.isAnonymous()) {
return false;
}
int count = 0;
for(RDFTriple triple : triples) {
if(triple.getObject() instanceof RDFResourceBlankNode) {
RDFResourceBlankNode object = (RDFResourceBlankNode) triple.getObject();
if(object.equals(node)) {
count++;
if (count > 1) {
return true;
}
}
}
}
return false;
}
/** @return root anonymous nodes */
public Set getRootAnonymousNodes() {
if (rootAnonymousNodes == null) {
rebuildAnonRoots();
}
return rootAnonymousNodes;
}
private void rebuildAnonRoots() {
rootAnonymousNodes = new HashSet();
for (RDFTriple triple : triples) {
if(triple.getSubject() instanceof RDFResourceBlankNode) {
rootAnonymousNodes.add((RDFResourceBlankNode)triple.getSubject());
}
}
for (RDFTriple triple : triples) {
if (!triple.getObject().isLiteral()) {
rootAnonymousNodes.remove(triple.getObject());
}
if (!triple.getSubject().isAnonymous()) {
rootAnonymousNodes.remove(triple.getSubject());
}
}
}
/** @param w
* writer to write to
* @throws IOException
* if exceptions happen */
public void dumpTriples(Writer w) throws IOException {
for (Set set : triplesBySubject.values()) {
for (RDFTriple triple : set) {
w.write(triple.toString());
w.write("\n");
}
}
w.flush();
}
public Set getAllTriples()
{
return Collections.unmodifiableSet(triples);
}
}
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