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

     * @return the root of the tree that is currently being built, or that has been most recently built
     *         using this builder
     */


    public NodeInfo getCurrentRoot() {
        NodeInfo physicalRoot = currentRoot;
        if (physicalRoot instanceof DocumentImpl && ((DocumentImpl)physicalRoot).isImaginary()) {
            return ((DocumentImpl)physicalRoot).getDocumentElement();
        } else {
            return physicalRoot;
        }

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        return true;
    }


    public void validate() throws XPathException {


        NodeInfo parent = getParent();
        global = (parent instanceof XSLStylesheet);


        if (!((parent instanceof StyleElement) && ((StyleElement)parent).mayContainParam())) {
            compileError("xsl:param must be immediately within a template, function or stylesheet", "XTSE0010");
        }


        if (!global) {
            AxisIterator preceding = iterateAxis(Axis.PRECEDING_SIBLING);
            while (true) {
                NodeInfo node = (NodeInfo)preceding.next();
                if (node == null) {
                    break;
                }
                if (node instanceof XSLParam) {
                    if (this.getVariableQName().equals(((XSLParam)node).getVariableQName())) {
                        compileError("The name of the parameter is not unique", "XTSE0580");
                    }
                } else if (node instanceof StyleElement) {
                    compileError("xsl:param must be the first element within a template or function", "XTSE0010");
                } else {
                    // it must be a text node; allow it if all whitespace
                    if (!Whitespace.isWhite(node.getStringValueCS())) {
                        compileError("xsl:param must not be preceded by text", "XTSE0010");
                    }
                }
            }

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    public void namespaceFixup() {
        NamePool pool = pipe.getConfiguration().getNamePool();
        nameCode = fixup(pool, nameCode, 0);
        if (attributes != null) {
            for (int a=0; a<attributes.size(); a++) {
                NodeInfo oldAtt = (NodeInfo)attributes.get(a);
                int oldCode = oldAtt.getNameCode();
                int newCode = fixup(pool, oldCode, a);
                if (oldCode != newCode) {
                    Orphan att = new Orphan(oldAtt.getConfiguration());
                    att.setNodeKind(Type.ATTRIBUTE);
                    att.setNameCode(newCode);
                    att.setStringValue(oldAtt.getStringValue());
                    att.setTypeAnnotation(oldAtt.getTypeAnnotation());
                    att.setSystemId(oldAtt.getSystemId());
                    attributes.set(a, att);
                }
            }
        }
    }

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    public static void main(String[] args) throws Exception {
        XPathEvaluator xpe = new XPathEvaluator();
//        XPathVariable in = xpe.declareVariable("", "in");
        XPathExpression exp = xpe.createExpression(
                "for $v in distinct-values(tokenize($in, '/')) return concat(' +', $v)");
        NodeInfo doc = xpe.getConfiguration().buildDocument(new StreamSource(new File(args[0])));
        XPathDynamicContext context = exp.createDynamicContext(doc);
        //context.setVariable(in, new StringValue(args[1]));
        SequenceIterator results = exp.iterate(context);
        while (true) {
            Item item = results.next();

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    public void stripTypeAnnotations() {
        setTypeCode(StandardNames.XS_UNTYPED);
        if (attributes != null) {
            for (int i=0; i<attributes.size(); i++) {
                NodeInfo att = (NodeInfo)attributes.get(i);
                if (att.getTypeAnnotation() != StandardNames.XS_UNTYPED_ATOMIC) {
                    Orphan o = new Orphan(att.getConfiguration());
                    o.setNodeKind(Type.ATTRIBUTE);
                    o.setNameCode(att.getNameCode());
                    o.setStringValue(att.getStringValue());
                    o.setSystemId(att.getSystemId());
                    o.setTypeAnnotation(StandardNames.XS_UNTYPED_ATOMIC);
                    attributes.set(i, o);
                }
            }
        }

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                }
                String href = hrefVal.getStringValue();
                if (href.indexOf('#') >= 0) {
                    return this;
                }
                NodeInfo item = Document.preLoadDoc(href, expressionBaseURI, config, this);
                if (item!=null) {
                    return new Literal(new SingletonNode(item));
                }
            } catch (Exception err) {
                // ignore the exception and try again at run-time

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        AtomicValue hrefVal = (AtomicValue)argument[0].evaluateItem(context);
        if (hrefVal==null) {
            return null;
        }
        String href = hrefVal.getStringValue();
        NodeInfo item = Document.makeDoc(href, expressionBaseURI, context, this);
        if (item==null) {
            // we failed to read the document
            dynamicError("Failed to load document " + href, "FODC0005", context);
            return null;
        }

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    /**
    * Evaluate in a general context
    */


    public Item evaluateItem(XPathContext c) throws XPathException {
        NodeInfo start = (NodeInfo)argument[0].evaluateItem(c);
        if (start==null) {
            return null;
        }
        return start.getRoot();
    }

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    /**
    * Evaluate in a general context
    */


    public Item evaluateItem(XPathContext c) throws XPathException {
        NodeInfo target;
        if (argument.length > 1) {
            target = (NodeInfo)argument[1].evaluateItem(c);
        } else {
            Item current = c.getContextItem();
            if (current==null) {

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    public static boolean isLang(String arglang, NodeInfo target) {




        String doclang = null;
        NodeInfo node = target;


        while(node!=null) {
            doclang = node.getAttributeValue(StandardNames.XML_LANG);
            if (doclang!=null) break;
            node = node.getParent();
            if (node==null) return false;
        }


        if (doclang==null) return false;

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