org.coode.owlapi.rdf.model.RDFLiteralNode 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 org.semanticweb.owlapi.model.IRI;
/**
* @author Matthew Horridge, The University Of Manchester, Bio-Health Informatics
* Group, Date: 06-Dec-2006
*/
public class RDFLiteralNode extends RDFNode implements Comparable {
private String literal;
private String lang;
private IRI datatype;
private int hashCode = 0;
@Override
public IRI getIRI() {
return null;
}
@Override
public boolean isAnonymous() {
return false;
}
/**
* @param literal
* lexical form
* @param datatype
* type
*/
public RDFLiteralNode(String literal, IRI datatype) {
this.literal = literal;
this.datatype = datatype;
}
/**
* @param literal
* lexical form
* @param lang
* language tag
*/
public RDFLiteralNode(String literal, String lang) {
this.literal = literal;
this.lang = lang;
}
/**
* Gets the lexical form of this literal.
*
* @return The lexical form
*/
public String getLiteral() {
return literal;
}
/**
* Gets the lang
*
* @return The lang, or {@code null} if there is no lang
*/
public String getLang() {
return lang;
}
/** @return the datatype, or {@code null} if there is no datatype */
public IRI getDatatype() {
return datatype;
}
/** @return true if the node has a datatype */
public boolean isTyped() {
return datatype != null;
}
@Override
public boolean isLiteral() {
return true;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("\"");
sb.append(literal);
sb.append("\"");
if (datatype != null) {
sb.append("^^<");
sb.append(datatype);
sb.append(">");
} else if (lang != null) {
sb.append("@");
sb.append(lang);
}
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof RDFLiteralNode)) {
return false;
}
RDFLiteralNode other = (RDFLiteralNode) obj;
if (!other.literal.equals(literal)) {
return false;
}
if (datatype != null) {
if (!datatype.equals(other.datatype)) {
return false;
}
} else if (other.getDatatype() != null) {
return false;
}
if (lang != null) {
return lang.equals(other.lang);
} else if (other.lang != null) {
return false;
}
return true;
}
@Override
public int hashCode() {
if (hashCode == 0) {
hashCode = 37;
hashCode = hashCode * 37 + literal.hashCode();
if (lang != null) {
hashCode = hashCode * 37 + lang.hashCode();
}
if (datatype != null) {
hashCode = hashCode * 37 + datatype.hashCode();
}
}
return hashCode;
}
@Override
public int compareTo(RDFNode b) {
if (!b.isLiteral()) {
return -1;
}
if (equals(b)) {
return 0;
}
int diff = 0;
RDFLiteralNode lit2 = (RDFLiteralNode) b;
if (isTyped()) {
if (lit2.isTyped()) {
diff = getLiteral().compareTo(lit2.getLiteral());
if (diff == 0) {
diff = getDatatype().compareTo(lit2.getDatatype());
}
} else {
diff = -1;
}
} else {
if (lit2.isTyped()) {
diff = 1;
} else {
if (getLang() != null) {
if (lit2.getLang() != null) {
diff = getLang().compareTo(lit2.getLang());
}
} else {
diff = -1;
}
if (diff == 0) {
diff = getLiteral().compareTo(lit2.getLiteral());
}
}
}
return diff;
}
}