Examples with IndentedWriter org.apache.jena.atlas.io.IndentedWriter used on opensource projects

Example 51 with IndentedWriter

use of org.apache.jena.atlas.io.IndentedWriter in project jena by apache.

the class ExQuerySelect2 method main.

public static void main(String[] args) {
    // Create the data.
    // This wil be the background (unnamed) graph in the dataset.
    Model model = createModel();
    // First part or the query string
    String prolog = "PREFIX dc: <" + DC.getURI() + ">";
    // Query string.
    String queryString = prolog + NL + "SELECT ?title WHERE {?x dc:title ?title}";
    Query query = QueryFactory.create(queryString);
    // Print with line numbers
    query.serialize(new IndentedWriter(System.out, true));
    System.out.println();
    // Or QueryExecutionFactory.create(queryString, model) ;
    try (QueryExecution qexec = QueryExecutionFactory.create(query, model)) {
        // A ResultSet is an iterator - any query solutions returned by .next()
        // are not accessible again.
        // Create a ResultSetRewindable that can be reset to the beginning.
        // Do before first use.
        ResultSetRewindable rewindable = qexec.execSelect().rewindable();
        ResultSetFormatter.out(rewindable);
        rewindable.reset();
        ResultSetFormatter.out(rewindable);
    }
}

Example 52 with IndentedWriter

use of org.apache.jena.atlas.io.IndentedWriter in project jena by apache.

the class ExProg1 method main.

public static void main(String[] args) {
    Model model = createModel();
    Query query = QueryFactory.make();
    query.setQuerySelectType();
    // Build pattern
    ElementGroup elg = new ElementGroup();
    Var varTitle = Var.alloc("title");
    Var varX = Var.alloc("x");
    Triple t1 = new Triple(varX, DC.title.asNode(), varTitle);
    elg.addTriplePattern(t1);
    // Don't use bNodes for anon variables.  The conversion is done in parsing.
    // BNodes here are assumed to be values from the target graph.
    Triple t2 = new Triple(varX, DC.description.asNode(), Var.alloc("desc"));
    elg.addTriplePattern(t2);
    // Attach the group to query.
    query.setQueryPattern(elg);
    // Choose what we want - SELECT *
    // query.setQueryResultStar(true) ;
    query.addResultVar(varTitle);
    // Print query with line numbers
    // Prefix mapping just helps serialization
    query.getPrefixMapping().setNsPrefix("dc", DC.getURI());
    query.serialize(new IndentedWriter(System.out, true));
    System.out.println();
    try (QueryExecution qexec = QueryExecutionFactory.create(query, model)) {
        // Assumption: it's a SELECT query.
        ResultSet rs = qexec.execSelect();
        // The order of results is undefined.
        System.out.println("Titles: ");
        for (; rs.hasNext(); ) {
            QuerySolution rb = rs.nextSolution();
            // Get title - variable names do not include the '?' (or '$')
            RDFNode x = rb.get("title");
            // Check the type of the result value
            if (x instanceof Literal) {
                Literal titleStr = (Literal) x;
                System.out.println("    " + titleStr);
            } else
                System.out.println("Strange - not a literal: " + x);
        }
    }
}

Example 53 with IndentedWriter

use of org.apache.jena.atlas.io.IndentedWriter in project jena by apache.

the class TriGWriterBase method write.

@Override
public void write(Writer out, DatasetGraph dsg, PrefixMap prefixMap, String baseURI, Context context) {
    IndentedWriter iOut = RiotLib.create(out);
    output$(iOut, dsg, prefixMap, baseURI, context);
}

Example 54 with IndentedWriter

use of org.apache.jena.atlas.io.IndentedWriter in project jena by apache.

the class ItemWriter method write.

public static void write(OutputStream out, Item item) {
    IndentedWriter iw = new IndentedWriter(out);
    write(iw, item, null);
    iw.ensureStartOfLine();
    iw.flush();
}

Example 55 with IndentedWriter

use of org.apache.jena.atlas.io.IndentedWriter in project jena by apache.

the class SSE method write.

public static void write(OutputStream out, Triple triple) {
    IndentedWriter iOut = new IndentedWriter(out);
    write(iOut, triple);
    iOut.flush();
}