Examples of org.w3c.dom.traversal.TreeWalker

org.w3c.dom.traversal.TreeWalker
TreeWalker objects are used to navigate a document tree or subtree using the view of the document defined by its whatToShow flags and any filters that are defined for the TreeWalker . Any function which performs navigation using a TreeWalker will automatically support any view defined by a TreeWalker .
Omitting nodes from the logical view of a subtree can result in a structure that is substantially different from the same subtree in the complete, unfiltered document. Nodes that are siblings in the TreeWalker view may be children of different, widely separated nodes in the original view. For instance, consider a Filter that skips all nodes except for Text nodes and the root node of a document. In the logical view that results, all text nodes will be siblings and appear as direct children of the root node, no matter how deeply nested the structure of the original document. @since DOM Level 2

    public void setUp() throws Exception {
        dom = DOMParser.toDocument(XML).getDocumentElement();
    }


    public void testRootNode() throws Exception {
        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_ALL, null, false);
        assertEquals("a", tw.getRoot().getLocalName());
    }

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        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_ALL, null, false);
        assertEquals("a", tw.getRoot().getLocalName());
    }


    public void testWhatToShow() throws Exception {
        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_COMMENT, null, false);
        assertEquals(NodeFilter.SHOW_COMMENT, tw.getWhatToShow());
        assertEquals(null, tw.nextNode());
    }

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                }
                return NodeFilter.FILTER_SKIP;
            }
        };


        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_ALL, nf, false);
        assertEquals(nf, tw.getFilter());
        assertEquals("b", tw.nextNode().getNodeName());
        assertEquals("f", tw.nextNode().getNodeName());
        assertEquals(null, tw.nextNode());
    }

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        assertEquals("f", tw.nextNode().getNodeName());
        assertEquals(null, tw.nextNode());
    }


    public void testNextNode() throws Exception {
        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_ALL, null, false);
        assertEquals("a", tw.getCurrentNode().getLocalName());


        assertEquals("b", tw.nextNode().getLocalName());
        assertEquals("c", tw.nextNode().getLocalName());
        assertEquals("d", tw.nextNode().getLocalName());
        assertEquals("e", tw.nextNode().getLocalName());
        assertEquals("f", tw.nextNode().getLocalName());
        assertEquals("g", tw.nextNode().getLocalName());
        assertEquals("h", tw.nextNode().getLocalName());
        assertEquals("i", tw.nextNode().getLocalName());
        assertEquals(null, tw.nextNode());
    }

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        assertEquals("i", tw.nextNode().getLocalName());
        assertEquals(null, tw.nextNode());
    }


    public void testPreviousNode() throws Exception {
        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_ALL, null, false);
        tw.setCurrentNode(dom.getLastChild());
        assertEquals("i", tw.getCurrentNode().getLocalName());


        assertEquals("h", tw.previousNode().getLocalName());
        assertEquals("g", tw.previousNode().getLocalName());
        assertEquals("f", tw.previousNode().getLocalName());
        assertEquals("e", tw.previousNode().getLocalName());
        assertEquals("d", tw.previousNode().getLocalName());
        assertEquals("c", tw.previousNode().getLocalName());
        assertEquals("b", tw.previousNode().getLocalName());
        assertEquals("a", tw.previousNode().getLocalName());
        assertEquals(null, tw.previousNode());
    }

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        assertEquals("a", tw.previousNode().getLocalName());
        assertEquals(null, tw.previousNode());
    }


    public void testCurrentNode() throws Exception {
        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_ALL, null, false);


        assertEquals("a", tw.getCurrentNode().getLocalName());
        assertEquals(null, tw.previousNode());
        assertEquals("a", tw.getCurrentNode().getLocalName());


        tw.setCurrentNode(dom.getLastChild());
        assertEquals("i", tw.getCurrentNode().getLocalName());
        assertEquals(null, tw.nextNode());
        assertEquals("i", tw.getCurrentNode().getLocalName());


        try {
            tw.setCurrentNode(null);
            fail("Exception expected");
        } catch (DOMException e) {
        }
        assertEquals("i", tw.getCurrentNode().getLocalName());
    }

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        }
        assertEquals("i", tw.getCurrentNode().getLocalName());
    }


    public void testParentNode() throws Exception {
        TreeWalker tw = new TreeWalkerImpl(dom, NodeFilter.SHOW_ALL, null, false);
        // Go to F node
        tw.nextNode();
        tw.nextNode();
        tw.nextNode();
        tw.nextNode();
        tw.nextNode();
        assertEquals("f", tw.getCurrentNode().getLocalName());


        assertEquals("d", tw.parentNode().getLocalName());
        assertEquals("c", tw.parentNode().getLocalName());
        assertEquals("a", tw.parentNode().getLocalName());
        assertEquals(null, tw.parentNode());
    }

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                accepted.add(scopeNode);
            }
        }


        // TreeWalker to walk DOM tree starting with the scopeNode. Nodes maybe visited multiple times.
        TreeWalker treeWalker = ((DocumentTraversal) scopeNode.getOwnerDocument())
            .createTreeWalker(scopeNode, NodeFilter.SHOW_ELEMENT, new NodeFilter() {
            @Override
            public short acceptNode(Node node) {
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    NamedNodeMap attributes = node.getAttributes();
                    if (attributes.getNamedItem(ITEMPROP_ATTRIBUTE) != null && !scopeNode.equals(node)) {
                        accepted.add(node);
                    }
                    if (attributes.getNamedItem(ITEMSCOPE_ATTRIBUTE) != null) {
                        // Don't visit descendants of nodes that define a new scope
                        return FILTER_REJECT;
                    }
                }
                return FILTER_ACCEPT;
            }
        }, false);


        // To populate accepted we only need to walk the tree.
      while (treeWalker.nextNode() != null);


        final List<ItemProp> result = new ArrayList<ItemProp>();
        for(Node itemPropNode :  accepted) {
            final String itemProp = DomUtils.readAttribute(itemPropNode, ITEMPROP_ATTRIBUTE, null);
            final String[] propertyNames = itemProp.split(" ");

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                accepted.add(scopeNode);
            }
        }


        // TreeWalker to walk DOM tree starting with the scopeNode. Nodes maybe visited multiple times.
        TreeWalker treeWalker = ((DocumentTraversal) scopeNode.getOwnerDocument())
            .createTreeWalker(scopeNode, NodeFilter.SHOW_ELEMENT, new NodeFilter() {
            @Override
            public short acceptNode(Node node) {
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    NamedNodeMap attributes = node.getAttributes();
                    if (attributes.getNamedItem(ITEMPROP_ATTRIBUTE) != null && !scopeNode.equals(node)) {
                        accepted.add(node);
                    }
                    if (attributes.getNamedItem(ITEMSCOPE_ATTRIBUTE) != null) {
                        // Don't visit descendants of nodes that define a new scope
                        return FILTER_REJECT;
                    }
                }
                return FILTER_ACCEPT;
            }
        }, false);


        // To populate accepted we only need to walk the tree.
      while (treeWalker.nextNode() != null);


        final List<ItemProp> result = new ArrayList<ItemProp>();
        for(Node itemPropNode :  accepted) {
            final String itemProp = DomUtils.readAttribute(itemPropNode, ITEMPROP_ATTRIBUTE, null);
            final String[] propertyNames = itemProp.split(" ");

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        private void parseDocument(Document dasDoc, String chr, List<Feature> features) {


            try {
                DocumentTraversal traversal = (DocumentTraversal) dasDoc;
                TreeWalker treewalker = traversal.createTreeWalker(
                        dasDoc.getDocumentElement(), NodeFilter.SHOW_ELEMENT, null, true);
                parseTree(treewalker, "FEATURE", chr, features);


            } catch (Exception ex) {
                log.error(ex);

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