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DatatypeTransformer.java
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DatatypeTransformer.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
* <p>
* 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.
* <p>
* 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/>.
*/
package cz.cvut.kbss.jopa.owlapi;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLDatatype;
import org.semanticweb.owlapi.model.OWLLiteral;
import org.semanticweb.owlapi.vocab.OWL2Datatype;
import uk.ac.manchester.cs.owl.owlapi.OWLDataFactoryImpl;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URI;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.EnumMap;
import java.util.Map;
import java.util.Objects;
/**
* Contains utility functions for transformations between OWL2 datatypes (usually based on XSD types) and Java types.
* <p>
* Mostly based on <a href="https://xmlbeans.apache.org/docs/3.0.0/guide/conXMLBeansSupportBuiltInSchemaTypes.html">https://xmlbeans.apache.org/docs/3.0.0/guide/conXMLBeansSupportBuiltInSchemaTypes.html</a>
*/
public class DatatypeTransformer {
private static final String DATE_TIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS";
private static final Map<OWL2Datatype, Class<?>> DATATYPE_MAP = new EnumMap<>(OWL2Datatype.class);
private static final OWLDataFactory DATA_FACTORY = new OWLDataFactoryImpl();
static {
DATATYPE_MAP.put(OWL2Datatype.RDF_PLAIN_LITERAL, String.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_STRING, String.class);
DATATYPE_MAP.put(OWL2Datatype.RDF_XML_LITERAL, String.class);
DATATYPE_MAP.put(OWL2Datatype.RDF_LANG_STRING, String.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_INT, Integer.class);
// technically, this is not correct, as XSD integer should be mapped to BigInteger, because it is unbound
// But OWL API maps it to integer, so we have to keep it this way too
DATATYPE_MAP.put(OWL2Datatype.XSD_INTEGER, Integer.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_NON_NEGATIVE_INTEGER, Integer.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_POSITIVE_INTEGER, Integer.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_NON_POSITIVE_INTEGER, Integer.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_NEGATIVE_INTEGER, Integer.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_UNSIGNED_INT, Long.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_DOUBLE, Double.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_FLOAT, Float.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_BOOLEAN, Boolean.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_DATE_TIME, Date.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_DATE_TIME_STAMP, Date.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_SHORT, Short.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_UNSIGNED_SHORT, Integer.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_LONG, Long.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_UNSIGNED_LONG, BigInteger.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_BYTE, Byte.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_UNSIGNED_BYTE, Short.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_ANY_URI, URI.class);
DATATYPE_MAP.put(OWL2Datatype.XSD_DECIMAL, BigDecimal.class);
}
private DatatypeTransformer() {
throw new AssertionError();
}
public static Class<?> transformOWLType(final OWLDatatype dt) {
Class<?> type = null;
if (dt.isBuiltIn()) {
type = DATATYPE_MAP.get(dt.getBuiltInDatatype());
}
if (type == null) {
throw new IllegalArgumentException("Unsupported datatype: " + dt);
}
return type;
}
public static boolean isSupportedJavaType(Class<?> dt) {
return DATATYPE_MAP.containsValue(dt);
}
/**
* Transforms the specified {@link OWLLiteral} to the corresponding Java type (if possible).
* <p>
* For instance, literals of type {@code xsd:int} are transformed to Java {@link Integer}s.
*
* @param literal Literal to transform
* @return Java object corresponding to the literal
*/
public static Object transform(final OWLLiteral literal) {
if (literal.isRDFPlainLiteral()) {
return literal.getLiteral();
} else if (literal.getDatatype().isBuiltIn()) {
switch (literal.getDatatype().getBuiltInDatatype()) {
case XSD_SHORT:
case XSD_UNSIGNED_BYTE:
return Short.parseShort(literal.getLiteral());
case XSD_LONG:
case XSD_UNSIGNED_INT:
return Long.parseLong(literal.getLiteral());
case XSD_INT:
case XSD_INTEGER:
case XSD_NON_NEGATIVE_INTEGER:
case XSD_NON_POSITIVE_INTEGER:
case XSD_POSITIVE_INTEGER:
case XSD_NEGATIVE_INTEGER:
case XSD_UNSIGNED_SHORT:
return Integer.parseInt(literal.getLiteral());
case XSD_DOUBLE:
return Double.parseDouble(literal.getLiteral());
case XSD_FLOAT:
return Float.parseFloat(literal.getLiteral());
case XSD_DECIMAL:
return new BigDecimal(literal.getLiteral());
case XSD_STRING:
case RDF_XML_LITERAL:
case RDF_LANG_STRING:
return literal.getLiteral();
case XSD_BOOLEAN:
return Boolean.parseBoolean(literal.getLiteral());
case XSD_ANY_URI:
return URI.create(literal.getLiteral());
case XSD_DATE_TIME_STAMP:
case XSD_DATE_TIME:
try {
return new SimpleDateFormat(DATE_TIME_FORMAT).parse(literal.getLiteral());
} catch (ParseException e) {
throw new IllegalArgumentException(
"The date time '" + literal.getLiteral() + "' cannot be parsed using format " +
DATE_TIME_FORMAT + ".");
}
default:
break;
}
}
throw new IllegalArgumentException("Unsupported datatype: " + literal.getDatatype());
}
/**
* Transforms the specified Java object to an {@link OWLLiteral}.
* <p>
* The datatype is determined from the object's type.
*
* @param value Value to transform
* @param lang Optional language for string literals
* @return {@code OWLiteral}
*/
public static OWLLiteral transform(Object value, String lang) {
Objects.requireNonNull(value);
if (value instanceof Integer) {
// Java implementations map int/Integer to xsd:int, because xsd:integer is unbounded, whereas xsd:int is 32-bit signed, same as Java
return DATA_FACTORY.getOWLLiteral(value.toString(), OWL2Datatype.XSD_INT);
} else if (value instanceof BigInteger) {
return DATA_FACTORY.getOWLLiteral(value.toString(), OWL2Datatype.XSD_INTEGER);
} else if (value instanceof Long) {
return DATA_FACTORY.getOWLLiteral(value.toString(), OWL2Datatype.XSD_LONG);
} else if (value instanceof Boolean) {
return DATA_FACTORY.getOWLLiteral((Boolean) value);
} else if (value instanceof Double) {
return DATA_FACTORY.getOWLLiteral((Double) value);
} else if (value instanceof Float) {
return DATA_FACTORY.getOWLLiteral((Float) value);
} else if (value instanceof BigDecimal) {
return DATA_FACTORY.getOWLLiteral(((BigDecimal) value).toPlainString(), OWL2Datatype.XSD_DECIMAL);
} else if (value instanceof String) {
return lang != null ? DATA_FACTORY.getOWLLiteral((String) value, lang) :
DATA_FACTORY.getOWLLiteral((String) value);
} else if (value instanceof Date) {
SimpleDateFormat sdf = new SimpleDateFormat(DATE_TIME_FORMAT);
return DATA_FACTORY.getOWLLiteral(sdf.format((Date) value),
DATA_FACTORY.getOWLDatatype(OWL2Datatype.XSD_DATE_TIME.getIRI()));
} else if (value.getClass().isEnum()) {
return DATA_FACTORY.getOWLLiteral(value.toString());
} else {
throw new IllegalArgumentException("Unsupported value " + value + " of type " + value.getClass());
}
}
}