Java Code Examples for org.w3c.dom.Node#getLastChild()

/** Finds and returns the last visible child element node. */
public static Element getLastVisibleChildElement(Node parent) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE &&
                !isHidden(child)) {
            return (Element)child;
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** Finds and returns the last child element node.
 *  Overload previous method for non-Xerces node impl.
 */
public static Element getLastChildElement(Node parent) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            return (Element)child;
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** Finds and returns the last visible child element node.
 *  Overload previous method for non-Xerces node impl
 */
public static Element getLastVisibleChildElement(Node parent, Hashtable hiddenNodes) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE &&
                !isHidden(child, hiddenNodes)) {
            return (Element)child;
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** Finds and returns the last visible child element node. */
public static Element getLastVisibleChildElement(Node parent) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE &&
                !isHidden(child)) {
            return (Element)child;
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** Finds and returns the last visible child element node.
 *  Overload previous method for non-Xerces node impl
 */
public static Element getLastVisibleChildElement(Node parent, Map<Node, String> hiddenNodes) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE &&
                !isHidden(child, hiddenNodes)) {
            return (Element)child;
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** Finds and returns the last visible child element node. */
public static Element getLastVisibleChildElement(Node parent) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE &&
                !isHidden(child)) {
            return (Element)child;
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** Finds and returns the last child node with the given name. */
public static Element getLastChildElement(Node parent, String elemName) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            if (child.getNodeName().equals(elemName)) {
                return (Element)child;
            }
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** Finds and returns the last child node with the given qualified name. */
public static Element getLastChildElementNS(Node parent,
        String uri, String localpart) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            String childURI = child.getNamespaceURI();
            if (childURI != null && childURI.equals(uri) &&
                    child.getLocalName().equals(localpart)) {
                return (Element)child;
            }
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/**
 * Finds and returns the last child node with the given name and
 * attribute name, value pair.
 */
public static Element getLastChildElement(Node   parent,
        String elemName,
        String attrName,
        String attrValue) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            Element element = (Element)child;
            if (element.getNodeName().equals(elemName) &&
                    element.getAttribute(attrName).equals(attrValue)) {
                return element;
            }
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

private Element getLastElementChild(Node n) {
    final Node top = n;
    while (n != null) {
        if (n.getNodeType() == Node.ELEMENT_NODE) {
            return (Element) n;
        }
        Node next = n.getLastChild();
        while (next == null) {
            if (top == n) {
                break;
            }
            next = n.getPreviousSibling();
            if (next == null) {
                n = n.getParentNode();
                if (n == null || top == n) {
                    return null;
                }
            }
        }
        n = next;
    }
    return null;
}
 

/** Finds and returns the last child node with the given qualified name. */
public static Element getLastChildElementNS(Node parent,
        String[][] elemNames) {

    // search for node
    Node child = parent.getLastChild();
    while (child != null) {
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            for (int i = 0; i < elemNames.length; i++) {
                String uri = child.getNamespaceURI();
                if (uri != null && uri.equals(elemNames[i][0]) &&
                        child.getLocalName().equals(elemNames[i][1])) {
                    return (Element)child;
                }
            }
        }
        child = child.getPreviousSibling();
    }

    // not found
    return null;

}
 

/** The method previousNode(Node) returns the previous node
 *  from the actual DOM tree.
 */
Node previousNode(Node node) {

    Node result;

    // if we're at the root, return null.
    if (node == fRoot) return null;

    // get sibling
    result = node.getPreviousSibling();
    if (result == null) {
        //if 1st sibling, return parent
        result = node.getParentNode();
        return result;
    }

    // if sibling has children, keep getting last child of child.
    if (result.hasChildNodes()
        && !(!fEntityReferenceExpansion
            && result != null
            && result.getNodeType() == Node.ENTITY_REFERENCE_NODE))

    {
        while (result.hasChildNodes()) {
            result = result.getLastChild();
        }
    }

    return result;
}
 

/** The method previousNode(Node) returns the previous node
 *  from the actual DOM tree.
 */
Node previousNode(Node node) {

    Node result;

    // if we're at the root, return null.
    if (node == fRoot) return null;

    // get sibling
    result = node.getPreviousSibling();
    if (result == null) {
        //if 1st sibling, return parent
        result = node.getParentNode();
        return result;
    }

    // if sibling has children, keep getting last child of child.
    if (result.hasChildNodes()
        && !(!fEntityReferenceExpansion
            && result != null
            && result.getNodeType() == Node.ENTITY_REFERENCE_NODE))

    {
        while (result.hasChildNodes()) {
            result = result.getLastChild();
        }
    }

    return result;
}
 

/**
 * Writes out the contents of this buffer as DOM node and append that to the given node.
 *
 * Faster implementation would be desirable.
 *
 * @return
 *      The newly added child node.
 */
public final Node writeTo(Node n) throws XMLStreamBufferException {
    try {
        Transformer t = trnsformerFactory.get().newTransformer();
        t.transform(new XMLStreamBufferSource(this), new DOMResult(n));
        return n.getLastChild();
    } catch (TransformerException e) {
        throw new XMLStreamBufferException(e);
    }
}
 

/**
 * Writes out the contents of this buffer as DOM node and append that to the given node.
 *
 * Faster implementation would be desirable.
 *
 * @return
 *      The newly added child node.
 */
public final Node writeTo(Node n) throws XMLStreamBufferException {
    try {
        Transformer t = trnsformerFactory.get().newTransformer();
        t.transform(new XMLStreamBufferSource(this), new DOMResult(n));
        return n.getLastChild();
    } catch (TransformerException e) {
        throw new XMLStreamBufferException(e);
    }
}
 

/** The method previousNode(Node) returns the previous node
 *  from the actual DOM tree.
 */
Node previousNode(Node node) {

    Node result;

    // if we're at the root, return null.
    if (node == fRoot) return null;

    // get sibling
    result = node.getPreviousSibling();
    if (result == null) {
        //if 1st sibling, return parent
        result = node.getParentNode();
        return result;
    }

    // if sibling has children, keep getting last child of child.
    if (result.hasChildNodes()
        && !(!fEntityReferenceExpansion
            && result != null
            && result.getNodeType() == Node.ENTITY_REFERENCE_NODE))

    {
        while (result.hasChildNodes()) {
            result = result.getLastChild();
        }
    }

    return result;
}
 

/** Synchronizes the node's data. */
protected void synchronizeData() {

    // no need to sync in the future
    needsSyncData(false);

    // fluff up enough nodes to fill identifiers hash
    if (fIdElement != null) {

        // REVISIT: There has to be a more efficient way of
        //          doing this. But keep in mind that the
        //          tree can have been altered and re-ordered
        //          before all of the element nodes with ID
        //          attributes have been registered. For now
        //          this is reasonable and safe. -Ac

        IntVector path = new IntVector();
        for (int i = 0; i < fIdCount; i++) {

            // ignore if it's already been registered
            int elementNodeIndex = fIdElement[i];
            String idName      = fIdName[i];
            if (idName == null) {
                continue;
            }

            // find path from this element to the root
            path.removeAllElements();
            int index = elementNodeIndex;
            do {
                path.addElement(index);
                int pchunk = index >> CHUNK_SHIFT;
                int pindex = index & CHUNK_MASK;
                index = getChunkIndex(fNodeParent, pchunk, pindex);
            } while (index != -1);

            // Traverse path (backwards), fluffing the elements
            // along the way. When this loop finishes, "place"
            // will contain the reference to the element node
            // we're interested in. -Ac
            Node place = this;
            for (int j = path.size() - 2; j >= 0; j--) {
                index = path.elementAt(j);
                Node child = place.getLastChild();
                while (child != null) {
                    if (child instanceof DeferredNode) {
                        int nodeIndex =
                            ((DeferredNode)child).getNodeIndex();
                        if (nodeIndex == index) {
                            place = child;
                            break;
                        }
                    }
                    child = child.getPreviousSibling();
                }
            }

            // register the element
            Element element = (Element)place;
            putIdentifier0(idName, element);
            fIdName[i] = null;

            // see if there are more IDs on this element
            while (i + 1 < fIdCount &&
                fIdElement[i + 1] == elementNodeIndex) {
                idName = fIdName[++i];
                if (idName == null) {
                    continue;
                }
                putIdentifier0(idName, element);
            }
        }

    } // if identifiers

}
 

/**
 * If any EntityReference to be removed has descendants that are not
 * EntityReference, Text, or CDATASection nodes, the replaceWholeText method
 * must fail before performing any modification of the document, raising a
 * DOMException with the code NO_MODIFICATION_ALLOWED_ERR. Traverse previous
 * siblings of the node to be replaced. If a previous sibling is an
 * EntityReference node, get it's last child. If the last child was a Text
 * or CDATASection node and its previous siblings are neither a replaceable
 * EntityReference or Text or CDATASection nodes, return false. IF the last
 * child was neither Text nor CDATASection nor a replaceable EntityReference
 * Node, then return true. If the last child was a Text or CDATASection node
 * any its previous sibling was not or was an EntityReference that did not
 * contain only Text or CDATASection nodes, return false. Check this
 * recursively for EntityReference nodes.
 *
 * @param node
 * @return true - can replace text false - can't replace exception must be
 *         raised
 */
private boolean canModifyPrev(Node node) {
    boolean textLastChild = false;

    Node prev = node.getPreviousSibling();

    while (prev != null) {

        short type = prev.getNodeType();

        if (type == Node.ENTITY_REFERENCE_NODE) {
            //If the previous sibling was entityreference
            //check if its content is replaceable
            Node lastChild = prev.getLastChild();

            //if the entity reference has no children
            //return false
            if (lastChild == null) {
                return false;
            }

            //The replacement text of the entity reference should
            //be either only text,cadatsections or replaceable entity
            //reference nodes or the last child should be neither of these
            while (lastChild != null) {
                short lType = lastChild.getNodeType();

                if (lType == Node.TEXT_NODE
                        || lType == Node.CDATA_SECTION_NODE) {
                    textLastChild = true;
                } else if (lType == Node.ENTITY_REFERENCE_NODE) {
                    if (!canModifyPrev(lastChild)) {
                        return false;
                    } else {
                        //If the EntityReference child contains
                        //only text, or non-text or ends with a
                        //non-text node.
                        textLastChild = true;
                    }
                } else {
                    //If the last child was replaceable and others are not
                    //Text or CDataSection or replaceable EntityRef nodes
                    //return false.
                    if (textLastChild) {
                        return false;
                    } else {
                        return true;
                    }
                }
                lastChild = lastChild.getPreviousSibling();
            }
        } else if (type == Node.TEXT_NODE
                || type == Node.CDATA_SECTION_NODE) {
            //If the previous sibling was text or cdatasection move to next
        } else {
            //If the previous sibling was anything but text or
            //cdatasection or an entity reference, stop search and
            //return true
            return true;
        }

        prev = prev.getPreviousSibling();
    }

    return true;
}
 

/** Synchronizes the node's data. */
protected void synchronizeData() {

    // no need to sync in the future
    needsSyncData(false);

    // fluff up enough nodes to fill identifiers hash
    if (fIdElement != null) {

        // REVISIT: There has to be a more efficient way of
        //          doing this. But keep in mind that the
        //          tree can have been altered and re-ordered
        //          before all of the element nodes with ID
        //          attributes have been registered. For now
        //          this is reasonable and safe. -Ac

        IntVector path = new IntVector();
        for (int i = 0; i < fIdCount; i++) {

            // ignore if it's already been registered
            int elementNodeIndex = fIdElement[i];
            String idName      = fIdName[i];
            if (idName == null) {
                continue;
            }

            // find path from this element to the root
            path.removeAllElements();
            int index = elementNodeIndex;
            do {
                path.addElement(index);
                int pchunk = index >> CHUNK_SHIFT;
                int pindex = index & CHUNK_MASK;
                index = getChunkIndex(fNodeParent, pchunk, pindex);
            } while (index != -1);

            // Traverse path (backwards), fluffing the elements
            // along the way. When this loop finishes, "place"
            // will contain the reference to the element node
            // we're interested in. -Ac
            Node place = this;
            for (int j = path.size() - 2; j >= 0; j--) {
                index = path.elementAt(j);
                Node child = place.getLastChild();
                while (child != null) {
                    if (child instanceof DeferredNode) {
                        int nodeIndex =
                            ((DeferredNode)child).getNodeIndex();
                        if (nodeIndex == index) {
                            place = child;
                            break;
                        }
                    }
                    child = child.getPreviousSibling();
                }
            }

            // register the element
            Element element = (Element)place;
            putIdentifier0(idName, element);
            fIdName[i] = null;

            // see if there are more IDs on this element
            while (i + 1 < fIdCount &&
                fIdElement[i + 1] == elementNodeIndex) {
                idName = fIdName[++i];
                if (idName == null) {
                    continue;
                }
                putIdentifier0(idName, element);
            }
        }

    } // if identifiers

}
 

/**
 * Returns the last child element of the specified node, or null if there
 * is no such element.
 *
 * @param node the node
 * @return the last child element of the specified node, or null if there
 *    is no such element
 * @throws NullPointerException if <code>node == null</code>
 */
public static Element getLastChildElement(Node node) {
    Node child = node.getLastChild();
    while (child != null && child.getNodeType() != Node.ELEMENT_NODE) {
        child = child.getPreviousSibling();
    }
    return (Element)child;
}