Examples with Expr org.apache.jena.sparql.expr.Expr used on opensource projects

Example 31 with Expr

use of org.apache.jena.sparql.expr.Expr in project jena by apache.

the class AggGroupConcat method prefixGroupConcatString.

protected static String prefixGroupConcatString(boolean isDistinct, String separator, ExprList exprs) {
    IndentedLineBuffer x = new IndentedLineBuffer();
    x.append("(");
    x.append("group_concat");
    if (isDistinct)
        x.append(" distinct");
    if (separator != null) {
        String y = StrUtils.escapeString(separator);
        x.append("(separator '");
        x.append(y);
        x.append("')");
    }
    x.incIndent();
    for (Expr e : exprs) {
        x.append(" ");
        WriterExpr.output(x, e, null);
    }
    x.decIndent();
    x.append(")");
    return x.asString();
}

Example 32 with Expr

use of org.apache.jena.sparql.expr.Expr in project jena by apache.

the class TestUserDefinedFunctionFactory method test_user_defined_function_factory_add_03.

@Test
public void test_user_defined_function_factory_add_03() throws ParseException {
    Expr e = new E_Multiply(new ExprVar("x"), new ExprVar("x"));
    //Instead of registering the pre-built expression register using a string for the expression
    UserDefinedFunctionFactory.getFactory().add("http://example/square", "?x * ?x", new ArrayList<>(e.getVarsMentioned()));
    Assert.assertTrue(UserDefinedFunctionFactory.getFactory().isRegistered("http://example/square"));
    Assert.assertEquals(e, UserDefinedFunctionFactory.getFactory().get("http://example/square").getBaseExpr());
}

Example 33 with Expr

use of org.apache.jena.sparql.expr.Expr in project jena by apache.

the class SelectClauseTest method testAddStringVar.

@ContractTest
public void testAddStringVar() throws Exception {
    SelectClause<?> selectClause = getProducer().newInstance();
    AbstractQueryBuilder<?> aqb = selectClause.addVar("rand()", Var.alloc("foo"));
    Query query = getQuery(aqb);
    VarExprList expr = query.getProject();
    assertEquals(1, expr.size());
    Expr e = expr.getExpr(Var.alloc("foo"));
    assertNotNull("expression should not be null", e);
    assertTrue("Should be an E_Random", e instanceof E_Random);
}

Example 34 with Expr

use of org.apache.jena.sparql.expr.Expr in project jena by apache.

the class SelectClauseTest method testAddExprVar.

@ContractTest
public void testAddExprVar() throws Exception {
    SelectClause<?> selectClause = getProducer().newInstance();
    AbstractQueryBuilder<?> aqb = selectClause.addVar(new E_Random(), Var.alloc("foo"));
    Query query = getQuery(aqb);
    VarExprList expr = query.getProject();
    assertEquals(1, expr.size());
    Expr e = expr.getExpr(Var.alloc("foo"));
    assertNotNull("expression should not be null", e);
    assertTrue("Should be an E_Random", e instanceof E_Random);
}

Example 35 with Expr

use of org.apache.jena.sparql.expr.Expr in project jena by apache.

the class SolutionModifierTest method testAddOrderByExprAscending.

@ContractTest
public void testAddOrderByExprAscending() {
    SolutionModifierClause<?> solutionModifier = getProducer().newInstance();
    Expr e = new E_Random();
    AbstractQueryBuilder<?> builder = solutionModifier.addOrderBy(e, Order.ASCENDING);
    assertContainsRegex(ORDER_BY + "ASC" + OPEN_PAREN + "rand" + OPEN_PAREN + CLOSE_PAREN + CLOSE_PAREN, builder.buildString());
    builder = solutionModifier.addOrderBy("bar");
    assertContainsRegex(ORDER_BY + "ASC" + OPEN_PAREN + "rand" + OPEN_PAREN + CLOSE_PAREN + CLOSE_PAREN + SPACE + var("bar"), builder.buildString());
}