uk.ac.manchester.cs.owl.owlapi.InternalsNoCache 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.Serializable;
import java.util.Locale;

import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAnnotationProperty;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLDataProperty;
import org.semanticweb.owlapi.model.OWLDatatype;
import org.semanticweb.owlapi.model.OWLLiteral;
import org.semanticweb.owlapi.model.OWLNamedIndividual;
import org.semanticweb.owlapi.model.OWLObjectProperty;
import org.semanticweb.owlapi.vocab.OWL2Datatype;
import org.semanticweb.owlapi.vocab.XSDVocabulary;

/** @author ignazio no cache used */
public class InternalsNoCache implements OWLDataFactoryInternals, Serializable {

    private static final long serialVersionUID = 30406L;
    private static final OWLDatatype RDF_PLAIN_LITERAL = OWL2DatatypeImpl
            .getDatatype(OWL2Datatype.RDF_PLAIN_LITERAL);
    private static final OWLDatatype XSD_BOOLEAN = OWL2DatatypeImpl
            .getDatatype(OWL2Datatype.XSD_BOOLEAN);
    private static final OWLDatatype XSD_DOUBLE = OWL2DatatypeImpl
            .getDatatype(OWL2Datatype.XSD_DOUBLE);
    private static final OWLDatatype XSD_FLOAT = OWL2DatatypeImpl
            .getDatatype(OWL2Datatype.XSD_FLOAT);
    private static final OWLDatatype XSD_INTEGER = OWL2DatatypeImpl
            .getDatatype(OWL2Datatype.XSD_INTEGER);
    private static final OWLDatatype RDFS_LITERAL = OWL2DatatypeImpl
            .getDatatype(OWL2Datatype.RDFS_LITERAL);
    private final OWLLiteral trueLiteral;
    private final OWLLiteral falseLiteral;
    private OWLLiteral negativeFloatZero;
    private final boolean useCompression;

    /**
     * @param useCompression
     *        true if compression of literals should be used
     */
    public InternalsNoCache(boolean useCompression) {
        trueLiteral = new OWLLiteralImplBoolean(true);
        falseLiteral = new OWLLiteralImplBoolean(false);
        this.useCompression = useCompression;
    }

    @Override
    public void purge() {}

    @Override
    public OWLClass getOWLClass(IRI iri) {
        return new OWLClassImpl(iri);
    }

    @Override
    public OWLObjectProperty getOWLObjectProperty(IRI iri) {
        return new OWLObjectPropertyImpl(iri);
    }

    @Override
    public OWLDataProperty getOWLDataProperty(IRI iri) {
        return new OWLDataPropertyImpl(iri);
    }

    @Override
    public OWLNamedIndividual getOWLNamedIndividual(IRI iri) {
        return new OWLNamedIndividualImpl(iri);
    }

    @Override
    public OWLDatatype getOWLDatatype(IRI iri) {
        return new OWLDatatypeImpl(iri);
    }

    @Override
    public OWLAnnotationProperty getOWLAnnotationProperty(IRI iri) {
        return new OWLAnnotationPropertyImpl(iri);
    }

    @Override
    public OWLLiteral getOWLLiteral(float value) {
        return new OWLLiteralImplFloat(value, getFloatOWLDatatype());
    }

    @Override
    public OWLLiteral getOWLLiteral(String value) {
        if (useCompression) {
            return new OWLLiteralImpl(value, "",
                    getOWLDatatype(XSDVocabulary.STRING.getIRI()));
        }
        return new OWLLiteralImplString(value);
    }

    @Override
    public OWLLiteral getOWLLiteral(String literal, String lang) {
        String normalisedLang;
        if (lang == null) {
            normalisedLang = "";
        } else {
            normalisedLang = lang.trim().toLowerCase(Locale.ENGLISH);
        }
        if (useCompression) {
            return new OWLLiteralImpl(literal, normalisedLang, null);
        }
        return new OWLLiteralImplPlain(literal, normalisedLang);
    }

    @Override
    public OWLLiteral getOWLLiteral(int value) {
        return new OWLLiteralImplInteger(value, getIntegerOWLDatatype());
    }

    @Override
    public OWLLiteral getOWLLiteral(boolean value) {
        return value ? trueLiteral : falseLiteral;
    }

    @Override
    public OWLLiteral getOWLLiteral(double value) {
        return new OWLLiteralImplDouble(value, getDoubleOWLDatatype());
    }

    @Override
    public OWLLiteral getOWLLiteral(String lexicalValue, OWLDatatype datatype) {
        OWLLiteral literal;
        if (datatype.isRDFPlainLiteral()) {
            int sep = lexicalValue.lastIndexOf('@');
            if (sep != -1) {
                String lex = lexicalValue.substring(0, sep);
                String lang = lexicalValue.substring(sep + 1);
                literal = getBasicLiteral(lex, lang, getRDFPlainLiteral());
            } else {
                literal = getBasicLiteral(lexicalValue, datatype);
            }
        } else {
            // check the special cases
            try {
                if (datatype.isString()) {
                    literal = getOWLLiteral(lexicalValue);
                } else if (datatype.isBoolean()) {
                    literal = getOWLLiteral(isBooleanTrueValue(lexicalValue
                            .trim()));
                } else if (datatype.isFloat()) {
                    if (lexicalValue.trim().equals("-0.0")) {
                        // according to some W3C test, this needs to be
                        // different from 0.0; Java floats disagree
                        if (negativeFloatZero == null) {
                            negativeFloatZero = getBasicLiteral("-0.0",
                                    XSD_FLOAT);
                        }
                        literal = negativeFloatZero;
                    } else {
                        try {
                            float f = Float.parseFloat(lexicalValue);
                            literal = getOWLLiteral(f);
                        } catch (NumberFormatException e) {
                            literal = getBasicLiteral(lexicalValue, datatype);
                        }
                    }
                } else if (datatype.isDouble()) {
                    literal = getOWLLiteral(Double.parseDouble(lexicalValue));
                } else if (datatype.isInteger()) {
                    // again, some W3C tests require padding zeroes to make
                    // literals different
                    if (lexicalValue.trim().charAt(0) == '0') {
                        literal = getBasicLiteral(lexicalValue,
                                getIntegerOWLDatatype());
                    } else {
                        try {
                            // this is fine for values that can be parsed as
                            // ints - not all values are
                            literal = getOWLLiteral(Integer
                                    .parseInt(lexicalValue));
                        } catch (NumberFormatException ex) {
                            // try as a big decimal
                            literal = getBasicLiteral(lexicalValue, datatype);
                        }
                    }
                } else {
                    literal = getBasicLiteral(lexicalValue, datatype);
                }
            } catch (NumberFormatException e) {
                // some literal is malformed, i.e., wrong format
                literal = getBasicLiteral(lexicalValue, datatype);
            }
        }
        return literal;
    }

    protected OWLLiteral getBasicLiteral(String lexicalValue,
            OWLDatatype datatype) {
        return getBasicLiteral(lexicalValue, "", datatype);
    }

    protected OWLLiteral getBasicLiteral(String lexicalValue, String lang,
            OWLDatatype datatype) {
        OWLLiteral literal = null;
        if (useCompression) {
            if (datatype == null || datatype.isRDFPlainLiteral()) {
                literal = new OWLLiteralImplPlain(lexicalValue, lang);
            } else {
                literal = new OWLLiteralImpl(lexicalValue, lang, datatype);
            }
        } else {
            literal = new OWLLiteralImplNoCompression(lexicalValue, lang,
                    datatype);
        }
        return literal;
    }

    // private boolean isBooleanFalseValue(String lexicalValue) {
    // return lexicalValue.equals("0") || lexicalValue.equals("false");
    // }
    private static boolean isBooleanTrueValue(String lexicalValue) {
        return lexicalValue.equals("1") || lexicalValue.equals("true");
    }

    @Override
    public OWLDatatype getTopDatatype() {
        return RDFS_LITERAL;
    }

    @Override
    public OWLDatatype getIntegerOWLDatatype() {
        return XSD_INTEGER;
    }

    @Override
    public OWLDatatype getFloatOWLDatatype() {
        return XSD_FLOAT;
    }

    @Override
    public OWLDatatype getDoubleOWLDatatype() {
        return XSD_DOUBLE;
    }

    @Override
    public OWLDatatype getBooleanOWLDatatype() {
        return XSD_BOOLEAN;
    }

    @Override
    public OWLDatatype getRDFPlainLiteral() {
        return RDF_PLAIN_LITERAL;
    }
}