edu.cornell.mannlib.vitro.webapp.utils.jena.URIUtils.java Source code

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Here is the source code for edu.cornell.mannlib.vitro.webapp.utils.jena.URIUtils.java

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/* $This file is distributed under the terms of the license in /doc/license.txt$ */

package edu.cornell.mannlib.vitro.webapp.utils.jena;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.rdf.model.Property;
import com.hp.hpl.jena.rdf.model.RDFNode;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.ResourceFactory;
import com.hp.hpl.jena.rdf.model.StmtIterator;
import com.hp.hpl.jena.shared.Lock;

public class URIUtils {

    private static final Log log = LogFactory.getLog(URIUtils.class.getName());

    public static boolean hasExistingURI(String uriStr, OntModel ontModel) {
        boolean existingURI = false;
        ontModel.enterCriticalSection(Lock.READ);
        try {
            boolean validPropertyURI = true;
            String localName = uriStr.substring(uriStr.lastIndexOf("/") + 1);
            //if local name is only numbers, this is not a valid uri for a property
            if (localName.matches("\\d+")) {
                validPropertyURI = false;
            }
            Resource newURIAsRes = ResourceFactory.createResource(uriStr);

            StmtIterator closeIt = ontModel.listStatements(newURIAsRes, null, (RDFNode) null);
            if (closeIt.hasNext()) {
                existingURI = true;

            }
            //if not in the subject position, check in object position
            if (!existingURI) {
                closeIt = ontModel.listStatements(null, null, newURIAsRes);
                if (closeIt.hasNext()) {
                    existingURI = true;
                }
            }
            //Check for property
            if (validPropertyURI && !existingURI) {
                Property newURIAsProp = ResourceFactory.createProperty(uriStr);
                closeIt = ontModel.listStatements(null, newURIAsProp, (RDFNode) null);
                if (closeIt.hasNext()) {
                    existingURI = true;
                }
            }
        } finally {
            ontModel.leaveCriticalSection();
        }

        return existingURI;
    }
}