Java Code Examples for com.hp.hpl.jena.graph.Node#getLiteralLexicalForm()

/**
 * Pretty-prints an RDF node and shortens URIs into QNames according to a
 * {@link PrefixMapping}.
 * @param n An RDF node
 * @return An N-Triples style textual representation with URIs shortened to QNames
 */
public static String toString(Node n, PrefixMapping prefixes) {
	if (n.isURI()) {
		return qNameOrURI(n.getURI(), prefixes);
	}
	if (n.isBlank()) {
		return "_:" + n.getBlankNodeLabel();
	}
	if (n.isVariable()) {
		return "?" + n.getName();
	}
	if (Node.ANY.equals(n)) {
		return "?ANY";
	}
	// Literal
	String s = "\"" + n.getLiteralLexicalForm() + "\"";
	if (!"".equals(n.getLiteralLanguage())) {
		s += "@" + n.getLiteralLanguage();
	}
	if (n.getLiteralDatatype() != null) {
		s += "^^" + qNameOrURI(n.getLiteralDatatypeURI(), prefixes);
	}
	return s;
}
 

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>";
    }
}
 

/**
 * 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();
}
 

public String extractValue(Node node) {
	return node.getLiteralLexicalForm();
}
 

/**
 * 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();
}
 

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;
}