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NamespaceResolver.java
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NamespaceResolver.java
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/**
* Copyright (C) 2016 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.utils;
import cz.cvut.kbss.jopa.vocabulary.RDF;
import cz.cvut.kbss.jopa.vocabulary.RDFS;
import cz.cvut.kbss.jopa.vocabulary.XSD;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
/**
* Holds mapping of prefixes to namespaces and allows resolution of prefixed IRIs.
* <p>
* Prefixes for RDF (rdf:), RDFS (rdfs:) and XSD (xsd:) are pre-registered.
*/
public class NamespaceResolver {
private final Map<String, String> namespaces = new HashMap<>();
public NamespaceResolver() {
registerDefaultPrefixes();
}
private void registerDefaultPrefixes() {
registerNamespace(RDF.PREFIX, RDF.NAMESPACE);
registerNamespace(RDFS.PREFIX, RDFS.NAMESPACE);
registerNamespace(XSD.PREFIX, XSD.NAMESPACE);
}
/**
* Registers the specified namespace with the specified prefix.
*
* @param prefix Prefix representing the namespace
* @param namespace Namespace to represent
*/
public void registerNamespace(String prefix, String namespace) {
Objects.requireNonNull(prefix);
Objects.requireNonNull(namespace);
namespaces.put(prefix, namespace);
}
/**
* Replaces prefix in the specified IRI with a full namespace IRI, if the IRI contains a prefix and it is registered
* in this resolver.
*
* @param iri The IRI to resolve
* @return Full IRI, if this resolver was able to resolve it, or the original IRI
*/
public String resolveFullIri(String iri) {
Objects.requireNonNull(iri);
final int colonIndex = iri.indexOf(':');
if (colonIndex == -1 || colonIndex > iri.length()) {
return iri;
}
final String prefix = iri.substring(0, colonIndex);
if (!namespaces.containsKey(prefix)) {
return iri;
}
final String localName = iri.substring(colonIndex + 1);
return namespaces.get(prefix) + localName;
}
}