Examples with Expression org.exist.xquery.Expression used on opensource projects

Example 6 with Expression

use of org.exist.xquery.Expression in project exist by eXist-db.

the class PreorderedValueSequence method processAll.

private void processAll() throws XPathException {
    for (int i = 0; i < orderSpecs.length; i++) {
        final Expression expr = orderSpecs[i].getSortExpression();
        final NodeSet result = expr.eval(null).toNodeSet();
        for (final NodeProxy p : result) {
            ContextItem context = p.getContext();
            // TODO : review to consider transverse context
            while (context != null) {
                if (context.getNode() instanceof OrderedNodeProxy) {
                    final OrderedNodeProxy cp = (OrderedNodeProxy) context.getNode();
                    cp.values[i] = p.atomize();
                }
                context = context.getNextDirect();
            }
        }
    }
}

Example 7 with Expression

use of org.exist.xquery.Expression in project exist by eXist-db.

the class XIncludeFilter method processXInclude.

/**
 * @param href     The resource to be xincluded
 * @param xpointer The xpointer
 * @return Optionally a ResourceError if it was not possible to retrieve the resource
 * to be xincluded
 * @throws SAXException              If a SAX processing error occurs
 */
protected Optional<ResourceError> processXInclude(final String href, String xpointer) throws SAXException {
    if (href == null) {
        throw new SAXException("No href attribute found in XInclude include element");
    }
    // save some settings
    DocumentImpl prevDoc = document;
    boolean createContainerElements = serializer.createContainerElements;
    serializer.createContainerElements = false;
    // The following comments are the basis for possible external documents
    XmldbURI docUri = null;
    try {
        docUri = XmldbURI.xmldbUriFor(href);
    /*
               if(!stylesheetUri.toCollectionPathURI().equals(stylesheetUri)) {
                   externalUri = stylesheetUri.getXmldbURI();
               }
               */
    } catch (final URISyntaxException e) {
    // could be an external URI!
    }
    // parse the href attribute
    LOG.debug("found href=\"{}\"", href);
    // String xpointer = null;
    // String docName = href;
    Map<String, String> params = null;
    DocumentImpl doc = null;
    org.exist.dom.memtree.DocumentImpl memtreeDoc = null;
    boolean xqueryDoc = false;
    if (docUri != null) {
        final String fragment = docUri.getFragment();
        if (!(fragment == null || fragment.length() == 0)) {
            throw new SAXException("Fragment identifiers must not be used in an xinclude href attribute. To specify an xpointer, use the xpointer attribute.");
        }
        // extract possible parameters in the URI
        params = null;
        final String paramStr = docUri.getQuery();
        if (paramStr != null) {
            params = processParameters(paramStr);
            // strip query part
            docUri = XmldbURI.create(docUri.getRawCollectionPath());
        }
        // Patch 1520454 start
        if (!docUri.isAbsolute() && document != null) {
            final String base = document.getCollection().getURI() + "/";
            final String child = "./" + docUri.toString();
            final URI baseUri = URI.create(base);
            final URI childUri = URI.create(child);
            final URI uri = baseUri.resolve(childUri);
            docUri = XmldbURI.create(uri);
        }
        // retrieve the document
        try {
            doc = serializer.broker.getResource(docUri, Permission.READ);
        } catch (final PermissionDeniedException e) {
            return Optional.of(new ResourceError("Permission denied to read XInclude'd resource", e));
        }
        /* Check if the document is a stored XQuery */
        if (doc != null && doc.getResourceType() == DocumentImpl.BINARY_FILE) {
            xqueryDoc = "application/xquery".equals(doc.getMimeType());
        }
    }
    // The document could not be found: check if it points to an external resource
    if (docUri == null || (doc == null && !docUri.isAbsolute())) {
        try {
            URI externalUri = new URI(href);
            final String scheme = externalUri.getScheme();
            // XQuery context.
            if (scheme == null && moduleLoadPath != null) {
                final String path = externalUri.getSchemeSpecificPart();
                Path f = Paths.get(path);
                if (!f.isAbsolute()) {
                    if (moduleLoadPath.startsWith(XmldbURI.XMLDB_URI_PREFIX)) {
                        final XmldbURI parentUri = XmldbURI.create(moduleLoadPath);
                        docUri = parentUri.append(path);
                        doc = (DocumentImpl) serializer.broker.getXMLResource(docUri);
                        if (doc != null && !doc.getPermissions().validate(serializer.broker.getCurrentSubject(), Permission.READ)) {
                            throw new PermissionDeniedException("Permission denied to read XInclude'd resource");
                        }
                    } else {
                        f = Paths.get(moduleLoadPath, path);
                        externalUri = f.toUri();
                    }
                }
            }
            if (doc == null) {
                final Either<ResourceError, org.exist.dom.memtree.DocumentImpl> external = parseExternal(externalUri);
                if (external.isLeft()) {
                    return Optional.of(external.left().get());
                } else {
                    memtreeDoc = external.right().get();
                }
            }
        } catch (final PermissionDeniedException e) {
            return Optional.of(new ResourceError("Permission denied on XInclude'd resource", e));
        } catch (final ParserConfigurationException | URISyntaxException e) {
            throw new SAXException("XInclude: failed to parse document at URI: " + href + ": " + e.getMessage(), e);
        }
    }
    /* if document has not been found and xpointer is
               * null, throw an exception. If xpointer != null
               * we retry below and interpret docName as
               * a collection.
               */
    if (doc == null && memtreeDoc == null && xpointer == null) {
        return Optional.of(new ResourceError("document " + docUri + " not found"));
    }
    if (xpointer == null && !xqueryDoc) {
        // no xpointer found - just serialize the doc
        if (memtreeDoc == null) {
            serializer.serializeToReceiver(doc, false);
        } else {
            serializer.serializeToReceiver(memtreeDoc, false);
        }
    } else {
        // process the xpointer or the stored XQuery
        Source source = null;
        final XQueryPool pool = serializer.broker.getBrokerPool().getXQueryPool();
        CompiledXQuery compiled = null;
        try {
            if (xpointer == null) {
                source = new DBSource(serializer.broker, (BinaryDocument) doc, true);
            } else {
                xpointer = checkNamespaces(xpointer);
                source = new StringSource(xpointer);
            }
            final XQuery xquery = serializer.broker.getBrokerPool().getXQueryService();
            XQueryContext context;
            compiled = pool.borrowCompiledXQuery(serializer.broker, source);
            if (compiled == null) {
                context = new XQueryContext(serializer.broker.getBrokerPool());
            } else {
                context = compiled.getContext();
                context.prepareForReuse();
            }
            context.declareNamespaces(namespaces);
            context.declareNamespace("xinclude", Namespaces.XINCLUDE_NS);
            // setup the http context if known
            if (serializer.httpContext != null) {
                context.setHttpContext(serializer.httpContext);
            }
            // TODO: change these to putting the XmldbURI in, but we need to warn users!
            if (document != null) {
                context.declareVariable("xinclude:current-doc", document.getFileURI().toString());
                context.declareVariable("xinclude:current-collection", document.getCollection().getURI().toString());
            }
            if (xpointer != null) {
                if (doc != null) {
                    context.setStaticallyKnownDocuments(new XmldbURI[] { doc.getURI() });
                } else if (docUri != null) {
                    context.setStaticallyKnownDocuments(new XmldbURI[] { docUri });
                }
            }
            // pass parameters as variables
            if (params != null) {
                for (final Map.Entry<String, String> entry : params.entrySet()) {
                    context.declareVariable(entry.getKey(), entry.getValue());
                }
            }
            if (compiled == null) {
                try {
                    compiled = xquery.compile(context, source, xpointer != null);
                } catch (final IOException e) {
                    throw new SAXException("I/O error while reading query for xinclude: " + e.getMessage(), e);
                }
            } else {
                compiled.getContext().updateContext(context);
                context.getWatchDog().reset();
            }
            LOG.info("xpointer query: {}", ExpressionDumper.dump((Expression) compiled));
            Sequence contextSeq = null;
            if (memtreeDoc != null) {
                contextSeq = memtreeDoc;
            }
            try {
                final Sequence seq = xquery.execute(serializer.broker, compiled, contextSeq);
                if (Type.subTypeOf(seq.getItemType(), Type.NODE)) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("xpointer found: {}", seq.getItemCount());
                    }
                    NodeValue node;
                    for (final SequenceIterator i = seq.iterate(); i.hasNext(); ) {
                        node = (NodeValue) i.nextItem();
                        serializer.serializeToReceiver(node, false);
                    }
                } else {
                    String val;
                    for (int i = 0; i < seq.getItemCount(); i++) {
                        val = seq.itemAt(i).getStringValue();
                        characters(val);
                    }
                }
            } finally {
                context.runCleanupTasks();
            }
        } catch (final XPathException | PermissionDeniedException e) {
            LOG.warn("xpointer error", e);
            throw new SAXException("Error while processing XInclude expression: " + e.getMessage(), e);
        } finally {
            if (compiled != null) {
                pool.returnCompiledXQuery(source, compiled);
            }
        }
    }
    // restore settings
    document = prevDoc;
    serializer.createContainerElements = createContainerElements;
    return Optional.empty();
}

Example 8 with Expression

use of org.exist.xquery.Expression in project exist by eXist-db.

the class FunIdRef method eval.

/**
 * @see org.exist.xquery.Expression#eval(Sequence, Item)
 */
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
    if (context.getProfiler().isEnabled()) {
        context.getProfiler().start(this);
        context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
        if (contextSequence != null) {
            context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);
        }
        if (contextItem != null) {
            context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());
        }
    }
    if (getArgumentCount() < 1) {
        throw new XPathException(this, ErrorCodes.XPST0017, "function id requires one argument");
    }
    if (contextItem != null) {
        contextSequence = contextItem.toSequence();
    }
    Sequence result;
    boolean processInMem = false;
    final Expression arg = getArgument(0);
    final Sequence idrefval = arg.eval(contextSequence);
    if (idrefval.isEmpty()) {
        result = Sequence.EMPTY_SEQUENCE;
    } else {
        String nextId;
        DocumentSet docs = null;
        if (getArgumentCount() == 2) {
            // second argument should be a node, whose owner document will be
            // searched for the id
            final Sequence nodes = getArgument(1).eval(contextSequence);
            if (nodes.isEmpty()) {
                throw new XPathException(this, ErrorCodes.XPDY0002, "no node or context item for fn:idref");
            }
            if (!Type.subTypeOf(nodes.itemAt(0).getType(), Type.NODE)) {
                throw new XPathException(this, ErrorCodes.XPTY0004, "fn:idref() argument is not a node");
            }
            NodeValue node = (NodeValue) nodes.itemAt(0);
            if (node.getImplementationType() == NodeValue.IN_MEMORY_NODE) // TODO : how to enforce this ?
            // If $node, or the context item if the second argument is omitted,
            // is a node in a tree whose root is not a document node [err:FODC0001] is raised                    processInMem = true;
            {
                processInMem = true;
            } else {
                MutableDocumentSet ndocs = new DefaultDocumentSet();
                ndocs.add(((NodeProxy) node).getOwnerDocument());
                docs = ndocs;
            }
            contextSequence = node;
        } else if (contextSequence == null) {
            throw new XPathException(this, ErrorCodes.XPDY0002, "no context item specified");
        } else if (!Type.subTypeOf(contextSequence.getItemType(), Type.NODE)) {
            throw new XPathException(this, ErrorCodes.XPTY0004, "context item is not a node");
        } else {
            if (contextSequence.isPersistentSet()) {
                docs = contextSequence.toNodeSet().getDocumentSet();
            } else {
                processInMem = true;
            }
        }
        if (processInMem) {
            result = new ValueSequence();
        } else {
            result = new ExtArrayNodeSet();
        }
        for (final SequenceIterator i = idrefval.iterate(); i.hasNext(); ) {
            nextId = i.nextItem().getStringValue();
            if (nextId.isEmpty()) {
                continue;
            }
            if (XMLNames.isNCName(nextId)) {
                if (processInMem) {
                    getIdRef(result, contextSequence, nextId);
                } else {
                    getIdRef((NodeSet) result, docs, nextId);
                }
            }
        }
    }
    result.removeDuplicates();
    if (context.getProfiler().isEnabled()) {
        context.getProfiler().end(this, "", result);
    }
    return result;
}

Example 9 with Expression

use of org.exist.xquery.Expression in project exist by eXist-db.

the class FunSubstringAfter method eval.

public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
    if (context.getProfiler().isEnabled()) {
        context.getProfiler().start(this);
        context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
        if (contextSequence != null) {
            context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);
        }
        if (contextItem != null) {
            context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());
        }
    }
    final Expression arg0 = getArgument(0);
    final Expression arg1 = getArgument(1);
    if (contextItem != null) {
        contextSequence = contextItem.toSequence();
    }
    final Sequence seq1 = arg0.eval(contextSequence);
    final Sequence seq2 = arg1.eval(contextSequence);
    String value;
    String cmp;
    Sequence result;
    if (seq1.isEmpty()) {
        value = StringValue.EMPTY_STRING.getStringValue();
    } else {
        value = seq1.getStringValue();
    }
    if (seq2.isEmpty()) {
        cmp = StringValue.EMPTY_STRING.getStringValue();
    } else {
        cmp = seq2.getStringValue();
    }
    if (cmp.isEmpty()) {
        result = new StringValue(value);
    } else {
        final Collator collator = getCollator(contextSequence, contextItem, 3);
        final int p = Collations.indexOf(collator, value, cmp);
        if (p == Constants.STRING_NOT_FOUND) {
            result = StringValue.EMPTY_STRING;
        } else {
            result = new StringValue(p + cmp.length() < value.length() ? value.substring(p + cmp.length()) : "");
        }
    }
    if (context.getProfiler().isEnabled()) {
        context.getProfiler().end(this, "", result);
    }
    return result;
}

Example 10 with Expression

use of org.exist.xquery.Expression in project exist by eXist-db.

the class FunSubstringBefore method eval.

public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
    if (context.getProfiler().isEnabled()) {
        context.getProfiler().start(this);
        context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
        if (contextSequence != null) {
            context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);
        }
        if (contextItem != null) {
            context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());
        }
    }
    final Expression arg0 = getArgument(0);
    final Expression arg1 = getArgument(1);
    if (contextItem != null) {
        contextSequence = contextItem.toSequence();
    }
    final Sequence seq1 = arg0.eval(contextSequence);
    final Sequence seq2 = arg1.eval(contextSequence);
    String value;
    String cmp;
    Sequence result;
    if (seq1.isEmpty()) {
        value = StringValue.EMPTY_STRING.getStringValue();
    } else {
        value = seq1.getStringValue();
    }
    if (seq2.isEmpty()) {
        cmp = StringValue.EMPTY_STRING.getStringValue();
    } else {
        cmp = seq2.getStringValue();
    }
    if (cmp.isEmpty()) {
        result = StringValue.EMPTY_STRING;
    } else {
        final Collator collator = getCollator(contextSequence, contextItem, 3);
        final int p = Collations.indexOf(collator, value, cmp);
        if (p == Constants.STRING_NOT_FOUND) {
            result = StringValue.EMPTY_STRING;
        } else {
            result = new StringValue(value.substring(0, p));
        }
    }
    if (context.getProfiler().isEnabled()) {
        context.getProfiler().end(this, "", result);
    }
    return result;
}