Java Code Examples for com.hp.hpl.jena.graph.Node#isLiteral()
The following examples show how to use
com.hp.hpl.jena.graph.Node#isLiteral() .
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Example 1
| Source File: RDFReader.java From marklogic-contentpump with Apache License 2.0 | 5 votes |
|
protected String object(Node node) {
if (node.isLiteral()) {
String text = node.getLiteralLexicalForm();
String type = node.getLiteralDatatypeURI();
String lang = node.getLiteralLanguage();
if (lang == null || "".equals(lang)) {
lang = "";
} else {
lang = " xml:lang='" + escapeXml(lang) + "'";
}
if ("".equals(lang)) {
if (type == null) {
type = "http://www.w3.org/2001/XMLSchema#string";
}
type = " datatype='" + escapeXml(type) + "'";
} else {
type = "";
}
return "<sem:object" + type + lang + ">" + escapeXml(text) + "</sem:object>";
} else if (node.isBlank()) {
return "<sem:object>http://marklogic.com/semantics/blank/" + Long.toHexString(
hash64(fuse(scramble(milliSecs),randomValue), node.getBlankNodeLabel()))
+"</sem:object>";
} else {
return "<sem:object>" + escapeXml(node.toString()) + "</sem:object>";
}
}
Example 2
| Source File: TypeConversion.java From semweb4j with BSD 2-Clause "Simplified" License | 5 votes |
|
/**
* Transforms a Jena node into a java object. Possible node types: uri,
* variable, literal (datatype, languageTag), blank node
*
* @param n The node to transform
* @return A specific java object
* @throws ModelRuntimeException from the underlying model
*/
public static org.ontoware.rdf2go.model.node.Node toRDF2Go(Node n) throws ModelRuntimeException {
// A return of null indicates that the variable is not present in this
// solution.
if(n == null)
return null;
if(n.isURI())
return new URIImpl(n.getURI());
if(n.isVariable())
throw new RuntimeException("Cannot convert a Jena variable to an RDF2Go node");
if(n.isLiteral()) {
LiteralLabel lit = n.getLiteral();
// datatype
if(lit.getDatatypeURI() != null) {
return new DatatypeLiteralImpl(lit.getLexicalForm(), new URIImpl(
lit.getDatatypeURI()));
}
// language tagged
if(lit.language() != null && !lit.language().equals(""))
return new LanguageTagLiteralImpl(lit.getLexicalForm(), lit.language());
// plain
return new PlainLiteralImpl(lit.getLexicalForm());
}
if(n.isBlank())
return new JenaBlankNode(n);
// none of the above - don't know how to transform that
throw new RuntimeException("no transformation defined from " + n + " to java");
}
Example 3
| Source File: NTriples.java From SolRDF with Apache License 2.0 | 5 votes |
|
/**
* Returns a {@link String} representation of the given {@link Node}.
*
* @param node the node.
* @return a {@link String} representation of the given {@link Node}.
*/
public static String asNt(final Node node) {
if (node.isURI()) {
return asNtURI(node);
} else if (node.isBlank()) {
return asNtBlankNode(node);
} else if (node.isLiteral()) {
return asNtLiteral(node);
}
throw new IllegalArgumentException(node.getClass().getName());
}
Example 4
| Source File: LocalGraph.java From SolRDF with Apache License 2.0 | 5 votes |
|
@Override
public void performAdd(final Triple triple) {
updateCommand.clear();
final SolrInputDocument document = new SolrInputDocument();
this.updateCommand.solrDoc = document;
document.setField(Field.C, graphNodeStringified);
document.setField(Field.S, asNt(triple.getSubject()));
document.setField(Field.P, asNtURI(triple.getPredicate()));
document.setField(Field.ID, UUID.nameUUIDFromBytes(
new StringBuilder()
.append(graphNodeStringified)
.append(triple.getSubject())
.append(triple.getPredicate())
.append(triple.getObject())
.toString().getBytes()).toString());
final String o = asNt(triple.getObject());
document.setField(Field.O, o);
final Node object = triple.getObject();
if (object.isLiteral()) {
final String language = object.getLiteralLanguage();
document.setField(Field.LANG, isNotNullOrEmptyString(language) ? language : NULL_LANGUAGE);
final RDFDatatype dataType = object.getLiteralDatatype();
final Object value = object.getLiteralValue();
registry.get(dataType != null ? dataType.getURI() : null).inject(document, value);
} else {
registry.catchAllFieldInjector.inject(document, o);
}
try {
updateProcessor.processAdd(updateCommand);
} catch (final Exception exception) {
LOGGER.error(MessageCatalog._00113_NWS_FAILURE, exception);
throw new AddDeniedException(exception.getMessage(), triple);
}
}
Example 5
| Source File: CloudGraph.java From SolRDF with Apache License 2.0 | 5 votes |
|
@Override
public void performAdd(final Triple triple) {
final SolrInputDocument document = new SolrInputDocument();
document.setField(Field.C, graphNodeStringified);
document.setField(Field.S, asNt(triple.getSubject()));
document.setField(Field.P, asNtURI(triple.getPredicate()));
document.setField(Field.ID, UUID.nameUUIDFromBytes(
new StringBuilder()
.append(graphNodeStringified)
.append(triple.getSubject())
.append(triple.getPredicate())
.append(triple.getObject())
.toString().getBytes()).toString());
final Node object = triple.getObject();
final String o = asNt(object);
document.setField(Field.O, o);
if (object.isLiteral()) {
final String language = object.getLiteralLanguage();
document.setField(Field.LANG, isNotNullOrEmptyString(language) ? language : NULL_LANGUAGE);
final RDFDatatype dataType = object.getLiteralDatatype();
final Object value = object.getLiteralValue();
registry.get(dataType != null ? dataType.getURI() : null).inject(document, value);
} else {
registry.catchAllFieldInjector.inject(document, o);
}
try {
cloud.add(document);
} catch (final Exception exception) {
LOGGER.error(MessageCatalog._00113_NWS_FAILURE, exception);
throw new AddDeniedException(exception.getMessage(), triple);
}
}
Example 6
| Source File: CloudGraph.java From SolRDF with Apache License 2.0 | 5 votes |
|
/**
* Builds a DELETE query.
*
* @param triple the triple (maybe a pattern?) that must be deleted.
* @return a DELETE query.
*/
String deleteQuery(final Triple triple) {
final StringBuilder builder = new StringBuilder();
if (triple.getSubject().isConcrete()) {
and(builder).append(fq(Field.S, asNt(triple.getSubject())));
}
if (triple.getPredicate().isConcrete()) {
and(builder).append(fq(Field.P, asNtURI(triple.getPredicate())));
}
if (triple.getObject().isConcrete()) {
and(builder);
final Node o = triple.getObject();
if (o.isLiteral()) {
final String language = o.getLiteralLanguage();
if (Strings.isNotNullOrEmptyString(language)) {
builder
.append(fq(Field.LANG, language))
.append(" AND ");
}
final String literalValue = o.getLiteralLexicalForm();
final RDFDatatype dataType = o.getLiteralDatatype();
registry.get(dataType != null ? dataType.getURI() : null).addConstraint(builder, literalValue);
} else {
registry.catchAllInjector().addConstraint(builder, asNt(o));
}
}
return and(builder).append(fq(Field.C, graphNodeStringified)).toString();
}
Example 7
| Source File: TypedNodeMaker.java From GeoTriples with Apache License 2.0 | 4 votes |
|
public boolean matches(Node node) {
return node.isLiteral()
&& this.language.equals(node.getLiteralLanguage())
&& ((this.datatype == null && node.getLiteralDatatype() == null)
|| (this.datatype != null && this.datatype.equals(node.getLiteralDatatype())));
}
Example 8
| Source File: LocalGraph.java From SolRDF with Apache License 2.0 | 4 votes |
|
/**
* Builds a DELETE query.
*
* @param triple the triple (maybe a pattern?) that must be deleted.
* @return a DELETE query.
*/
String deleteQuery(final Triple triple) {
final StringBuilder builder = new StringBuilder();
if (triple.getSubject().isConcrete()) {
builder
.append(Field.S)
.append(":\"")
.append(asNt(triple.getSubject()))
.append("\"");
}
if (triple.getPredicate().isConcrete()) {
if (builder.length() != 0) {
builder.append(" AND ");
}
builder
.append(Field.P)
.append(":\"")
.append(asNtURI(triple.getPredicate()))
.append("\"");
}
if (triple.getObject().isConcrete()) {
if (builder.length() != 0) {
builder.append(" AND ");
}
final Node o = triple.getObject();
if (o.isLiteral()) {
final String language = o.getLiteralLanguage();
builder
.append(Field.LANG)
.append(":")
.append(isNotNullOrEmptyString(language) ? language : NULL_LANGUAGE)
.append(" AND ");
final String literalValue = o.getLiteralLexicalForm();
final RDFDatatype dataType = o.getLiteralDatatype();
registry.get(dataType != null ? dataType.getURI() : null).addConstraint(builder, literalValue);
} else {
registry.catchAllInjector().addConstraint(builder, asNt(o));
}
}
return builder
.append(" AND ")
.append(Field.C)
.append(":\"")
.append(graphNodeStringified)
.append("\"")
.toString();
}
Example 9
| Source File: LocalGraph.java From SolRDF with Apache License 2.0 | 4 votes |
|
SolrIndexSearcher.QueryCommand queryCommand(final Triple pattern, final SortSpec sortSpec) throws SyntaxError {
final SolrIndexSearcher.QueryCommand cmd = new SolrIndexSearcher.QueryCommand();
cmd.setQuery(new MatchAllDocsQuery());
cmd.setSort(sortSpec.getSort());
cmd.setLen(queryFetchSize);
cmd.setFlags(cmd.getFlags() | SolrIndexSearcher.GET_DOCSET);
final List<Query> filters = new ArrayList<Query>();
final Node s = pattern.getMatchSubject();
final Node p = pattern.getMatchPredicate();
final Node o = pattern.getMatchObject();
if (s != null) {
filters.add(new TermQuery(new Term(Field.S, asNt(s))));
}
if (p != null) {
filters.add(new TermQuery(new Term(Field.P, asNtURI(p))));
}
if (o != null) {
if (o.isLiteral()) {
final String language = o.getLiteralLanguage();
filters.add(
isNotNullOrEmptyString(language)
? languageTermQuery(language)
: NULL_LANGUAGE_TERM_QUERY);
final String literalValue = o.getLiteralLexicalForm();
final RDFDatatype dataType = o.getLiteralDatatype();
registry.get(
dataType != null
? dataType.getURI()
: null).addFilterConstraint(filters, literalValue, request);
} else {
filters.add(new TermQuery(new Term(Field.TEXT_OBJECT, asNt(o))));
}
}
filters.add(graphTermQuery);
cmd.setFilterList(filters);
return cmd;
}
Example 10
| Source File: SPARQLEndPoint.java From LodView with MIT License | 4 votes |
|
private List<TripleBean> moreThenOneQuery(QueryExecution qe, List<TripleBean> results, int retry, String overrideProperty) throws Exception {
try {
ResultSet rs = qe.execSelect();
while (rs.hasNext()) {
TripleBean rb = new TripleBean();
QuerySolution qs = rs.next();
String property = "";
if (overrideProperty != null) {
property = overrideProperty;
} else if (qs.get("p") != null) {
property = qs.get("p").asNode().toString();
}
try {
if (qs.get("s") != null && !qs.get("s").asNode().toString().startsWith("http://")) { // probably
// a
// bn
rb.setIRI(qs.get("s").asNode().toString());
rb.setNsIRI("_:" + rb.getIRI());
} else if (qs.get("s") != null && qs.get("s").asNode().toString().startsWith("http://")) {
rb.setIRI(qs.get("s").asNode().toString());
rb.setNsIRI(Misc.toNsResource(rb.getIRI(), conf));
rb.setUrl(Misc.toBrowsableUrl(rb.getIRI(), conf));
}
PropertyBean p = new PropertyBean();
p.setNsProperty(Misc.toNsResource(property, conf));
p.setProperty(property);
if (ontoBean != null) {
p.setLabel(ontoBean.getEscapedValue("label", locale, property));
p.setComment(ontoBean.getEscapedValue("comment", locale, property));
}
p.setPropertyUrl(Misc.toBrowsableUrl(property, conf));
rb.setProperty(p);
if (qs.get("o") != null) {
Node object = qs.get("o").asNode();
if (object.isURI()) {
rb.setType("iri");
rb.setValue(object.toString(false));
} else if (object.isLiteral()) {
rb.setType("literal");
rb.setDataType(object.getLiteralDatatypeURI());
rb.setNsDataType(Misc.toNsResource(object.getLiteralDatatypeURI(), conf));
rb.setLang(object.getLiteralLanguage());
rb.setValue(object.getLiteralLexicalForm());
} else if (object.isBlank()) {
rb.setType("bnode");
rb.setValue(object.toString(false));
}
} else {
rb.setType("literal");
rb.setValue("");
}
results.add(rb);
} catch (Exception e) {
System.err.println("error? " + e.getMessage());
// e.printStackTrace();
}
}
} catch (Exception ez) {
if (retry < 3) {
retry++;
// System.out.println("query failed (" + ez.getMessage() +
// "), I'm giving another chance (" + retry + "/3)");
return moreThenOneQuery(qe, results, retry, overrideProperty);
}
ez.printStackTrace();
throw new Exception("connection refused");
}
return results;
}
