uk.ac.manchester.cs.owl.owlapi.OWLLiteralImpl 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 uk.ac.manchester.cs.owl.owlapi;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Serializable;
import java.io.Writer;
import java.util.Arrays;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import org.semanticweb.owlapi.model.OWLAnnotationValueVisitor;
import org.semanticweb.owlapi.model.OWLAnnotationValueVisitorEx;
import org.semanticweb.owlapi.model.OWLDataVisitor;
import org.semanticweb.owlapi.model.OWLDataVisitorEx;
import org.semanticweb.owlapi.model.OWLDatatype;
import org.semanticweb.owlapi.model.OWLLiteral;
import org.semanticweb.owlapi.model.OWLObject;
import org.semanticweb.owlapi.model.OWLObjectVisitor;
import org.semanticweb.owlapi.model.OWLObjectVisitorEx;
import org.semanticweb.owlapi.model.OWLRuntimeException;
import org.semanticweb.owlapi.vocab.OWL2Datatype;
/**
* Implementation of {@link OWLLiteral} that uses compression of strings. See
* also {@link OWLLiteralImplNoCompression}
*
* @author Matthew Horridge, The University Of Manchester, Bio-Health
* Informatics Group, Date: 26-Oct-2006
*/
public class OWLLiteralImpl extends OWLObjectImpl implements OWLLiteral {
private static final long serialVersionUID = 30406L;
private static final int COMPRESSION_LIMIT = 160;
private static final OWLDatatype RDF_PLAIN_LITERAL = OWL2DatatypeImpl
.getDatatype(OWL2Datatype.RDF_PLAIN_LITERAL);
private final LiteralWrapper literal;
private final OWLDatatype datatype;
private final String lang;
private final int hashcode;
/**
* @param literal
* the lexical form
* @param lang
* the language; can be null or an empty string, in which case
* datatype can be any datatype but not null
* @param datatype
* the datatype; if lang is null or the empty string, it can be null
* or it MUST be RDFPlainLiteral
*/
public OWLLiteralImpl(String literal, String lang, OWLDatatype datatype) {
super();
this.literal = new LiteralWrapper(literal);
if (lang == null || lang.length() == 0) {
this.lang = "";
if (datatype == null) {
this.datatype = RDF_PLAIN_LITERAL;
} else {
this.datatype = datatype;
}
} else {
if (datatype != null && !datatype.isRDFPlainLiteral()) {
// ERROR: attempting to build a literal with a language tag and
// type different from plain literal
throw new OWLRuntimeException(
"Error: cannot build a literal with type: "
+ datatype.getIRI() + " and language: " + lang);
}
this.lang = lang;
this.datatype = RDF_PLAIN_LITERAL;
}
hashcode = getHashCode();
}
@Override
public String getLiteral() {
return literal.get();
}
@Override
public boolean isRDFPlainLiteral() {
return datatype.getIRI()
.equals(OWL2Datatype.RDF_PLAIN_LITERAL.getIRI());
}
@Override
public boolean isInteger() {
return datatype.getIRI().equals(OWL2Datatype.XSD_INTEGER.getIRI());
}
@Override
public boolean isBoolean() {
return datatype.getIRI().equals(OWL2Datatype.XSD_BOOLEAN.getIRI());
}
@Override
public boolean isDouble() {
return datatype.getIRI().equals(OWL2Datatype.XSD_DOUBLE.getIRI());
}
@Override
public boolean isFloat() {
return datatype.getIRI().equals(OWL2Datatype.XSD_FLOAT.getIRI());
}
@Override
public boolean hasLang() {
return !lang.equals("");
}
@Override
public int parseInteger() throws NumberFormatException {
return Integer.parseInt(literal.get());
}
@Override
public boolean parseBoolean() throws NumberFormatException {
if (literal.get().equals("0")) {
return false;
}
if (literal.get().equals("1")) {
return true;
}
if (literal.get().equals("true")) {
return true;
}
if (literal.get().equals("false")) {
return false;
}
return false;
}
@Override
public double parseDouble() throws NumberFormatException {
return Double.parseDouble(literal.get());
}
@Override
public float parseFloat() throws NumberFormatException {
return Float.parseFloat(literal.get());
}
@Override
public String getLang() {
return lang;
}
@Override
public boolean hasLang(String l) {
if (l == null && lang == null) {
return true;
}
if (l == null) {
l = "";
}
return lang != null && lang.equalsIgnoreCase(l.trim());
}
@Override
public OWLDatatype getDatatype() {
return datatype;
}
@Override
public int hashCode() {
return hashcode;
}
private int getHashCode() {
int hashCode = 277;
hashCode = hashCode * 37 + getDatatype().hashCode();
hashCode = hashCode * 37;
if (literal.l != null) {
hashCode += literal.l.hashCode();
} else {
hashCode += Arrays.hashCode(literal.bytes);
}
if (hasLang()) {
hashCode = hashCode * 37 + getLang().hashCode();
}
return hashCode;
}
@Override
public boolean equals(Object obj) {
if (super.equals(obj)) {
if (!(obj instanceof OWLLiteral)) {
return false;
}
OWLLiteral other = (OWLLiteral) obj;
return literal.get().equals(other.getLiteral())
&& datatype.equals(other.getDatatype())
&& lang.equals(other.getLang());
}
return false;
}
@Override
public void accept(OWLDataVisitor visitor) {
visitor.visit(this);
}
@Override
public O accept(OWLDataVisitorEx visitor) {
return visitor.visit(this);
}
@Override
public void accept(OWLAnnotationValueVisitor visitor) {
visitor.visit(this);
}
@Override
public O accept(OWLAnnotationValueVisitorEx visitor) {
return visitor.visit(this);
}
@Override
protected int compareObjectOfSameType(OWLObject object) {
OWLLiteral other = (OWLLiteral) object;
int diff = literal.get().compareTo(other.getLiteral());
if (diff != 0) {
return diff;
}
diff = datatype.compareTo(other.getDatatype());
if (diff != 0) {
return diff;
}
return lang.compareTo(other.getLang());
}
@Override
public void accept(OWLObjectVisitor visitor) {
visitor.visit(this);
}
@Override
public O accept(OWLObjectVisitorEx visitor) {
return visitor.visit(this);
}
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// /////
// ///// Literal Wraper
// /////
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
private static final class LiteralWrapper implements Serializable {
private static final long serialVersionUID = 30406L;
String l;
byte[] bytes;
LiteralWrapper(String s) {
if (s.length() > COMPRESSION_LIMIT) {
try {
bytes = compress(s);
l = null;
} catch (IOException e) {
// some problem happened - defaulting to no compression
l = s;
bytes = null;
}
} else {
bytes = null;
l = s;
}
}
String get() {
if (l != null) {
return l;
}
try {
return decompress(bytes);
} catch (IOException e) {
// some problem has happened - cannot recover from this
e.printStackTrace();
return null;
}
}
byte[] compress(String s) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
GZIPOutputStream zipout;
zipout = new GZIPOutputStream(out);
Writer writer = new OutputStreamWriter(zipout, COMPRESSED_ENCODING);
writer.write(s);
writer.flush();
zipout.finish();
zipout.flush();
return out.toByteArray();
}
String decompress(byte[] result) throws IOException {
ByteArrayInputStream in = new ByteArrayInputStream(result);
GZIPInputStream zipin = new GZIPInputStream(in);
Reader reader = new InputStreamReader(zipin, COMPRESSED_ENCODING);
StringBuilder b = new StringBuilder();
int c = reader.read();
while (c > -1) {
b.append((char) c);
c = reader.read();
}
return b.toString();
}
private static final String COMPRESSED_ENCODING = "UTF-16";
}
}
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