Examples of org.pdf4j.saxon.om.NodeInfo

org.pdf4j.saxon.om.NodeInfo
The NodeInfo interface represents a node in Saxon's implementation of the XPath 2.0 data model.
Note that several NodeInfo objects may represent the same node. To test node identity, the method {@link #isSameNodeInfo(NodeInfo)} should be used. An exception to this rule applies fordocument nodes, where the correspondence between document nodes and DocumentInfo objects is one to one. NodeInfo objects are never reused: a given NodeInfo object represents the same node for its entire lifetime.
This is the primary interface for accessing trees in Saxon, and it forms part of the public Saxon API. The only subclass of NodeInfo that applications should normally use is {@link DocumentInfo}, which represents a document node. Methods that form part of the public API are (since Saxon 8.4) labelled with a JavaDoc "since" tag: classes and methods that have no such label should not be regarded as stable interfaces.
The interface represented by this class is at a slightly higher level than the abstraction described in the W3C data model specification, in that it includes support for the XPath axes, rather than exposing the lower-level properties (such as "parent" and "children") directly. All navigation within trees, except for a few convenience methods, is done by following the axes using the {@link #iterateAxis} method.This allows different implementations of the XPath tree model to implement axis navigation in different ways. Some implementations may choose to use the helper methods provided in class {@link Navigator}.
Note that the stability of this interface applies to classes that use the interface, not to classes that implement it. The interface may be extended in future to add new methods.
New implementations of NodeInfo are advised also to implement the methods in interface ExtendedNodeInfo, which will be moved into this interface at some time in the future. @author Michael H. Kay @since 8.4. Extended with three extra methods, previously in ExtendedNodeInfo, in 9.1

                if (source==null) {
                    r = controller.getStandardURIResolver();
                    source = r.resolve(href, baseURL);
                }
                if (source instanceof NodeInfo || source instanceof DOMSource) {
                    NodeInfo startNode = controller.prepareInputTree(source);
                    source = startNode.getDocumentRoot();
                }
            } catch (TransformerException err) {
                XPathException xerr = XPathException.makeXPathException(err);
                xerr.setLocator(locator);
                if (xerr.getErrorCodeLocalPart() == null) {

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        Configuration config = pipe.getConfiguration();
        if (source == null) {
            throw new NullPointerException("Source supplied to builder cannot be null");
        }


        NodeInfo start;
        if (source instanceof DOMSource || source instanceof NodeInfo) {
            start = config.unravel(source);
            if (stripper != null) {
                DocumentInfo docInfo = start.getDocumentRoot();
                StrippedDocument strippedDoc = new StrippedDocument(docInfo, stripper);
                start = strippedDoc.wrap(start);
            }


        } else {

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        if (select != null && hasChildNodes()) {
            String errorCode = getErrorCodeForSelectPlusContent();
            compileError("An " + getDisplayName() + " element with a select attribute must be empty", errorCode);
        }
        AxisIterator kids = iterateAxis(Axis.CHILD);
        NodeInfo first = (NodeInfo)kids.next();
        if (select == null) {
            if (first == null) {
                // there are no child nodes and no select attribute
                //stringValue = "";
                select = new StringLiteral(StringValue.EMPTY_STRING);
            } else {
                if (kids.next() == null) {
                    // there is exactly one child node
                    if (first.getNodeKind() == Type.TEXT) {
                        // it is a text node: optimize for this case
                        select = new StringLiteral(first.getStringValue());
                    }
                }
            }
        }
    }

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        if (!(parent instanceof SaxonIterate)) {
            compileError("saxon:finally is not allowed as a child of " + parent.getDisplayName(), "XTSE0010");
        }
        AxisIterator sibs = iterateAxis(Axis.FOLLOWING_SIBLING, NodeKindTest.ELEMENT);
        while (true) {
            NodeInfo sib = (NodeInfo)sibs.next();
            if (sib == null) {
                break;
            }
            if (!(sib instanceof XSLFallback)) {
                compileError("saxon:finally must be the last child of saxon:iterate", "XTSE0010");

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    public void validate() throws XPathException {
        super.validate();
        connection = typeCheck("connection", connection);
        AxisIterator kids = iterateAxis(Axis.CHILD);
        while(true) {
            NodeInfo curr = (NodeInfo)kids.next();
            if (curr == null) {
                break;
            }
            if (curr instanceof SQLColumn) {
                // OK
            } else if (curr.getNodeKind() == Type.TEXT && Whitespace.isWhite(curr.getStringValueCS())) {
                // OK
            } else {
                compileError("Only sql:column is allowed as a child of sql:insert", "XTSE0010");
            }
        }

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        StringBuffer statement = new StringBuffer(120);
        statement.append("INSERT INTO " + table + " (");


        AxisIterator kids = iterateAxis(Axis.CHILD);
        NodeInfo child;
    int cols = 0;
    while (true) {
            child = (NodeInfo)kids.next();
            if (child == null) {
                break;

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    public List getColumnInstructions(Executable exec) throws XPathException {
        List list = new ArrayList(10);


        AxisIterator kids = iterateAxis(Axis.CHILD);
        NodeInfo child;
    while (true) {
            child = (NodeInfo)kids.next();
            if (child == null) {
                break;
            }

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     * not well-formed, this returns the first element child of the root if there is one, otherwise
     * null.
     */


    public Element getDocumentElement() {
        NodeInfo root = node.getDocumentRoot();
        if (root==null) {
            return null;
        }
        AxisIterator children =
            root.iterateAxis(Axis.CHILD, NodeKindTest.ELEMENT);
        return (Element)wrap((NodeInfo)children.next());
    }

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     protected static NodeList getElementsByTagName(NodeInfo node, String tagname) {
         AxisIterator allElements = node.iterateAxis(Axis.DESCENDANT);
         ArrayList nodes = new ArrayList(100);
         while(true) {
             NodeInfo next = (NodeInfo)allElements.next();
             if (next == null) {
                 break;
             }
             if (next.getNodeKind()==Type.ELEMENT) {
                 if (tagname.equals("*") || tagname.equals(next.getDisplayName())) {
                     nodes.add(NodeOverNodeInfo.wrap(next));
                 }
             }
         }
         return new DOMNodeList(nodes);

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     public static NodeList getElementsByTagNameNS(NodeInfo node, String namespaceURI, String localName) {
         String ns = (namespaceURI==null ? "" : namespaceURI);
         AxisIterator allElements = node.iterateAxis(Axis.DESCENDANT);
         ArrayList nodes = new ArrayList(100);
         while(true) {
             NodeInfo next = (NodeInfo)allElements.next();
             if (next == null) {
                 break;
             }
             if (next.getNodeKind()==Type.ELEMENT) {
                 if ((ns.equals("*") || ns.equals(next.getURI())) &&
                     (localName.equals("*") || localName.equals(next.getLocalPart()))) {
                     nodes.add(NodeOverNodeInfo.wrap(next));
                 }
             }
         }
         return new DOMNodeList(nodes);

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