Examples with ASTUpdateContainer org.eclipse.rdf4j.query.parser.sparql.ast.ASTUpdateContainer used on opensource projects

Example 1 with ASTUpdateContainer

use of org.eclipse.rdf4j.query.parser.sparql.ast.ASTUpdateContainer in project rdf4j by eclipse.

the class SPARQLParser method parseUpdate.

@Override
public ParsedUpdate parseUpdate(String updateStr, String baseURI) throws MalformedQueryException {
    try {
        ParsedUpdate update = new ParsedUpdate(updateStr);
        ASTUpdateSequence updateSequence = SyntaxTreeBuilder.parseUpdateSequence(updateStr);
        List<ASTUpdateContainer> updateOperations = updateSequence.getUpdateContainers();
        List<ASTPrefixDecl> sharedPrefixDeclarations = null;
        Node node = updateSequence.jjtGetChild(0);
        Set<String> globalUsedBNodeIds = new HashSet<String>();
        for (int i = 0; i < updateOperations.size(); i++) {
            ASTUpdateContainer uc = updateOperations.get(i);
            if (uc.jjtGetNumChildren() == 0 && i > 0 && i < updateOperations.size() - 1) {
                // empty update in the middle of the sequence
                throw new MalformedQueryException("empty update in sequence not allowed");
            }
            StringEscapesProcessor.process(uc);
            BaseDeclProcessor.process(uc, baseURI);
            WildcardProjectionProcessor.process(uc);
            if (uc.getBaseDecl() != null) {
                baseURI = uc.getBaseDecl().getIRI();
            }
            // do a special dance to handle prefix declarations in sequences: if
            // the current
            // operation has its own prefix declarations, use those. Otherwise,
            // try and use
            // prefix declarations from a previous operation in this sequence.
            List<ASTPrefixDecl> prefixDeclList = uc.getPrefixDeclList();
            if (prefixDeclList == null || prefixDeclList.size() == 0) {
                if (sharedPrefixDeclarations != null) {
                    for (ASTPrefixDecl prefixDecl : sharedPrefixDeclarations) {
                        uc.jjtAppendChild(prefixDecl);
                    }
                }
            } else {
                sharedPrefixDeclarations = prefixDeclList;
            }
            PrefixDeclProcessor.process(uc);
            Set<String> usedBNodeIds = BlankNodeVarProcessor.process(uc);
            if (uc.getUpdate() instanceof ASTInsertData || uc.getUpdate() instanceof ASTInsertData) {
                if (Collections.disjoint(usedBNodeIds, globalUsedBNodeIds)) {
                    globalUsedBNodeIds.addAll(usedBNodeIds);
                } else {
                    throw new MalformedQueryException("blank node identifier may not be shared across INSERT/DELETE DATA operations");
                }
            }
            UpdateExprBuilder updateExprBuilder = new UpdateExprBuilder(SimpleValueFactory.getInstance());
            ASTUpdate updateNode = uc.getUpdate();
            if (updateNode != null) {
                UpdateExpr updateExpr = (UpdateExpr) updateNode.jjtAccept(updateExprBuilder, null);
                // add individual update expression to ParsedUpdate sequence
                // container
                update.addUpdateExpr(updateExpr);
                // associate updateExpr with the correct dataset (if any)
                Dataset dataset = DatasetDeclProcessor.process(uc);
                update.map(updateExpr, dataset);
            }
        }
        return update;
    } catch (ParseException e) {
        throw new MalformedQueryException(e.getMessage(), e);
    } catch (TokenMgrError e) {
        throw new MalformedQueryException(e.getMessage(), e);
    } catch (VisitorException e) {
        throw new MalformedQueryException(e.getMessage(), e);
    }
}