Examples with Item org.apache.jena.sparql.sse.Item used on opensource projects

Example 66 with Item

use of org.apache.jena.sparql.sse.Item in project jena by apache.

the class BuilderExpr method buildItem.

public Expr buildItem(Item item) {
    Expr expr = null;
    if (item.isList()) {
        ItemList list = item.getList();
        if (list.size() == 0)
            BuilderLib.broken(item, "Empty list for expression");
        Item head = list.get(0);
        if (head.isNode()) {
            if (head.getNode().isVariable() && list.size() == 1) {
                // The case of (?z)
                return new ExprVar(Var.alloc(head.getNode()));
            }
            return buildFunctionCall(list);
        } else if (head.isList())
            BuilderLib.broken(item, "Head is a list");
        else if (head.isSymbol()) {
            if (item.isTagged(Tags.tagExpr)) {
                BuilderLib.checkLength(2, list, "Wrong length: " + item.shortString());
                item = list.get(1);
                return buildItem(item);
            }
            return buildKnownFunction(list);
        }
        throw new ARQInternalErrorException();
    }
    if (item.isNode()) {
        if (Var.isVar(item.getNode()))
            return new ExprVar(Var.alloc(item.getNode()));
        return NodeValue.makeNode(item.getNode());
    }
    if (item.isSymbolIgnoreCase(Tags.tagTrue))
        return NodeValue.TRUE;
    if (item.isSymbolIgnoreCase(Tags.tagFalse))
        return NodeValue.FALSE;
    BuilderLib.broken(item, "Not a list or a node or recognized symbol: " + item);
    return null;
}

Example 67 with Item

use of org.apache.jena.sparql.sse.Item in project jena by apache.

the class BuilderGraph method buildGraph.

public static Graph buildGraph(Graph graph, ItemList list) {
    if (!list.isEmpty() && list.get(0).isSymbol()) {
        if (list.get(0).isSymbol(Tags.tagGraph))
            list = list.cdr();
    }
    for (Item item : list) {
        BuilderLib.checkList(item);
        Triple triple = buildTriple(item.getList());
        graph.add(triple);
    }
    return graph;
}

Example 68 with Item

use of org.apache.jena.sparql.sse.Item in project jena by apache.

the class BuilderGraph method loadGraph.

private static void loadGraph(Graph graph, ItemList list) {
    BuilderLib.checkLength(2, list, Tags.tagLoad);
    Item item = list.get(1);
    if (!item.isNode())
        BuilderLib.broken(item, "Expected: (" + Tags.tagLoad + " 'filename')");
    String s = NodeUtils.stringLiteral(item.getNode());
    if (s == null)
        BuilderLib.broken(item, "Expected: (" + Tags.tagLoad + " 'filename')");
    Model model = ModelFactory.createModelForGraph(graph);
    FileManager.get().readModel(model, s);
}

Example 69 with Item

use of org.apache.jena.sparql.sse.Item in project jena by apache.

the class ParseHandlerForm method listFinish.

@Override
public void listFinish(int line, int column) {
    ItemList list = currentList();
    if (!frameStack.isCurrent(list)) {
        // Nothing special - proceed as normal.
        super.listFinish(line, column);
        return;
    }
    if (inDecl)
        throwException("Inconsistent form: Still in DECL at end of the form", line, column);
    // For later: no exception: ensure this is cleared.
    inDecl = false;
    finishForm(list);
    // Frame
    Frame f = frameStack.pop();
    // Drop the form list.
    popList();
    //setCurrentItem(null) ;  // Clear, in case top level item is a form of nothing.
    // Form output skipped if no result registered.
    Item item = f.result;
    // If all forms at least evaluate to nil.
    //        if ( item == null )
    //            item = Item.createNil(list.getLine(), list.getColumn()) ;
    // And emit a result as a listAdd.
    // Must go through our listAdd() here to handle nested forms.
    // item==null : remove nil code above to allow forms that have no output.
    //        if ( item != null )
    listAdd(item);
}

Example 70 with Item

use of org.apache.jena.sparql.sse.Item in project jena by apache.

the class ParseHandlerPlain method emitVar.

@Override
public void emitVar(int line, int column, String varName) {
    Var var = null;
    switch(varName) {
        case "":
            // "?"
            var = varAlloc.allocVar();
            break;
        case ARQConstants.allocVarAnonMarker:
            // "??" -- Allocate a non-distinguished variable
            var = varAllocND.allocVar();
            break;
        case ARQConstants.allocVarMarker:
            // "?." -- Allocate a named variable
            var = varAllocIntern.allocVar();
            break;
        default:
            var = Var.alloc(varName);
            break;
    }
    Item item = Item.createNode(var, line, column);
    listAdd(item);
}