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/*
* 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.semanticweb.owlapi.model;
import java.io.Serializable;
import java.util.concurrent.atomic.AtomicInteger;
/**
* An object that identifies an ontology. Since OWL 2, ontologies do not have to
* have an ontology IRI, or if they have an ontology IRI then they can
* optionally also have a version IRI. Instances of this OWLOntologyID class
* bundle identifying information of an ontology together. If an ontology
* doesn't have an ontology IRI then we say that it is "anonymous".
*
* @author Matthew Horridge, The University of Manchester, Information
* Management Group, Date: 18-Jan-2009
*/
public final class OWLOntologyID implements Comparable,
Serializable {
private static final long serialVersionUID = 30406L;
private static final AtomicInteger counter = new AtomicInteger();
private static final String ANON_PREFIX = "Anonymous-";
private String internalID;
private final IRI ontologyIRI;
private final IRI versionIRI;
private int hashCode;
/**
* Constructs an ontology identifier specifying the ontology IRI.
*
* @param ontologyIRI
* The ontology IRI used to indentify the ontology
*/
public OWLOntologyID(IRI ontologyIRI) {
this(ontologyIRI, null);
}
/**
* Constructs an ontology identifier specifiying the ontology IRI and
* version IRI.
*
* @param iri
* The ontology IRI (may be {@code null})
* @param versionIRI
* The version IRI (must be {@code null} if the ontologyIRI is null)
*/
public OWLOntologyID(IRI iri, IRI versionIRI) {
ontologyIRI = NodeID.isAnonymousNodeIRI(iri) ? null : iri;
hashCode = 17;
if (ontologyIRI != null) {
internalID = null;
hashCode += 37 * ontologyIRI.hashCode();
}
if (versionIRI != null) {
if (ontologyIRI == null) {
throw new IllegalArgumentException(
"If the ontology IRI is null then it is not possible to specify a version IRI");
}
this.versionIRI = versionIRI;
hashCode += 37 * versionIRI.hashCode();
} else {
this.versionIRI = null;
}
if (ontologyIRI == null) {
internalID = ANON_PREFIX + counter.getAndIncrement();
hashCode += 37 * internalID.hashCode();
}
}
/**
* Constructs an ontology identifier specifying that the ontology IRI (and
* hence the version IRI) is not present.
*/
public OWLOntologyID() {
this(null, null);
}
/**
* Determines if this is a valid OWL 2 DL ontology ID. To be a valid OWL 2
* DL ID, the ontology IRI and version IRI must not be reserved vocabulary.
*
* @return {@code true} if this is a valid OWL 2 DL ontology ID, otherwise
* {@code false}
* @see org.semanticweb.owlapi.model.IRI#isReservedVocabulary()
*/
public boolean isOWL2DLOntologyID() {
return ontologyIRI == null || !ontologyIRI.isReservedVocabulary()
&& (versionIRI == null || !versionIRI.isReservedVocabulary());
}
@Override
public int compareTo(OWLOntologyID o) {
return toString().compareTo(o.toString());
}
/**
* Gets the ontology IRI.
*
* @return the ontology IRI, or {@code null} if there is no ontology IRI.
*/
public IRI getOntologyIRI() {
return ontologyIRI;
}
/**
* Gets the version IRI.
*
* @return the version IRI, or {@code null} if there is no version IRI.
*/
public IRI getVersionIRI() {
return versionIRI;
}
/**
* Gets the IRI which is used as a default for the document that contain a
* representation of an ontology with this ID. This will be the version IRI
* if there is an ontology IRI and version IRI, else it will be the ontology
* IRI if there is an ontology IRI but no version IRI, else it will be
* {@code null} if there is no ontology IRI. See Ontology
* Documents in the OWL 2 Structural Specification.
*
* @return The IRI that can be used as a default for an ontology document
* containing an ontology as identified by this ontology ID. Returns
* the default IRI or {@code null}.
*/
public IRI getDefaultDocumentIRI() {
if (ontologyIRI != null) {
if (versionIRI != null) {
return versionIRI;
} else {
return ontologyIRI;
}
} else {
return null;
}
}
/**
* Determines if this ID names an ontology or whether it is an ID for an
* ontology without an IRI.
*
* @return {@code true} if this ID is an ID for an ontology without an IRI,
* or {@code false} if this ID is an ID for an ontology with an IRI.
*/
public boolean isAnonymous() {
return ontologyIRI == null || NodeID.isAnonymousNodeIRI(ontologyIRI);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder("OntologyID(");
if (ontologyIRI != null) {
sb.append("OntologyIRI(");
sb.append(ontologyIRI.toQuotedString());
sb.append(")");
if (versionIRI != null) {
sb.append(" VersionIRI(");
sb.append(versionIRI.toQuotedString());
sb.append(")");
}
} else {
sb.append(internalID);
}
sb.append(")");
return sb.toString();
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (obj == this) {
return true;
}
if (!(obj instanceof OWLOntologyID)) {
return false;
}
OWLOntologyID other = (OWLOntologyID) obj;
if (isAnonymous() && other.isAnonymous()) {
// both anonymous: check the anon version
return internalID.equals(other.internalID);
}
if (isAnonymous() != other.isAnonymous()) {
// one anonymous, one not: equals is false
return false;
}
if (!isAnonymous()) {
boolean toReturn = ontologyIRI.equals(other.ontologyIRI);
if (!toReturn) {
return toReturn;
}
// if toReturn is true, compare the version iris
if (versionIRI != null) {
toReturn = versionIRI.equals(other.versionIRI);
} else {
toReturn = other.versionIRI == null;
}
return toReturn;
}
// else this is anonymous and the other cannot be anonymous, so return
// false
return false;
}
}
