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IdentifierUtils.java
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IdentifierUtils.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
*
* 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/>.
*/
package cz.cvut.kbss.ontodriver.util;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import java.net.URI;
import java.net.URL;
import java.util.Objects;
import java.util.Random;
/**
* Utility for automatic identifier generation.
*/
public class IdentifierUtils {
private static final Random RANDOM = new Random();
private IdentifierUtils() {
throw new AssertionError();
}
/**
* Generates a (pseudo) random identifier based on the specified class URI.
* <p>
* The identifier consists of the class URI and then contains the string 'instance' and a random integer to ensure
* uniqueness. The 'instance' part is appended after a slash or a _, if the class URI contains a hash fragment.
*
* @param classUri Class URI used as identifier base
* @return Generated identifier
*/
public static URI generateIdentifier(URI classUri) {
Objects.requireNonNull(classUri);
if (classUri.getFragment() != null) {
return URI.create(classUri + "_instance" + RANDOM.nextInt());
} else {
String base = classUri.toString();
if (base.endsWith("/")) {
return URI.create(base + "instance" + RANDOM.nextInt());
} else {
return URI.create(base + "/instance" + RANDOM.nextInt());
}
}
}
/**
* Resolves whether the specified value is a resource identifier.
* <p>
* Only absolute IRIs are supported (i.e. no blank node identifiers).
*
* @param value The value to check
* @return {@code true} if the value is either an URI or an URL
*/
public static boolean isResourceIdentifier(Object value) {
if (value instanceof NamedResource || value instanceof java.net.URI || value instanceof URL) {
return true;
}
if (!(value instanceof String)) {
return false;
}
try {
final java.net.URI uri = java.net.URI.create(value.toString());
return uri.isAbsolute();
} catch (IllegalArgumentException e) {
return false;
}
}
}