domnodehelper.java

解决如何把XML应用到JAVA里问题

                int length = text.length();

                if ((offset < 0) || (offset > length)) {
                    throw new DOMException(DOMException.INDEX_SIZE_ERR,
                            "No text at offset: " + offset);
                } else {
                    StringBuffer buffer = new StringBuffer(text);
                    buffer.insert(offset, arg);
                    data.setText(buffer.toString());
                }
            }
        }
    }

    public static void deleteData(CharacterData charData, int offset, int count)
            throws DOMException {
        if (charData.isReadOnly()) {
            throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR,
                    "CharacterData node is read only: " + charData);
        } else {
            if (count < 0) {
                throw new DOMException(DOMException.INDEX_SIZE_ERR,
                        "Illegal value for count: " + count);
            }

            String text = charData.getText();

            if (text != null) {
                int length = text.length();

                if ((offset < 0) || (offset >= length)) {
                    throw new DOMException(DOMException.INDEX_SIZE_ERR,
                            "No text at offset: " + offset);
                } else {
                    StringBuffer buffer = new StringBuffer(text);
                    buffer.delete(offset, offset + count);
                    charData.setText(buffer.toString());
                }
            }
        }
    }

    public static void replaceData(CharacterData charData, int offset,
            int count, String arg) throws DOMException {
        if (charData.isReadOnly()) {
            throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR,
                    "CharacterData node is read only: " + charData);
        } else {
            if (count < 0) {
                throw new DOMException(DOMException.INDEX_SIZE_ERR,
                        "Illegal value for count: " + count);
            }

            String text = charData.getText();

            if (text != null) {
                int length = text.length();

                if ((offset < 0) || (offset >= length)) {
                    throw new DOMException(DOMException.INDEX_SIZE_ERR,
                            "No text at offset: " + offset);
                } else {
                    StringBuffer buffer = new StringBuffer(text);
                    buffer.replace(offset, offset + count, arg);
                    charData.setText(buffer.toString());
                }
            }
        }
    }

    // Branch API
    // -------------------------------------------------------------------------
    public static void appendElementsByTagName(List list, Branch parent,
            String name) {
        final boolean isStar = "*".equals(name);

        for (int i = 0, size = parent.nodeCount(); i < size; i++) {
            Node node = parent.node(i);

            if (node instanceof Element) {
                Element element = (Element) node;

                if (isStar || name.equals(element.getName())) {
                    list.add(element);
                }

                appendElementsByTagName(list, element, name);
            }
        }
    }

    public static void appendElementsByTagNameNS(List list, Branch parent,
            String namespace, String localName) {
        final boolean isStarNS = "*".equals(namespace);
        final boolean isStar = "*".equals(localName);

        for (int i = 0, size = parent.nodeCount(); i < size; i++) {
            Node node = parent.node(i);

            if (node instanceof Element) {
                Element element = (Element) node;

                if ((isStarNS
                        || (((namespace == null) 
                                || (namespace.length() == 0)) && ((element
                                .getNamespaceURI() == null) || (element
                                .getNamespaceURI().length() == 0))) 
                                || ((namespace != null) && namespace
                        .equals(element.getNamespaceURI())))
                        && (isStar || localName.equals(element.getName()))) {
                    list.add(element);
                }

                appendElementsByTagNameNS(list, element, namespace, localName);
            }
        }
    }

    // Helper methods
    // -------------------------------------------------------------------------
    public static NodeList createNodeList(final List list) {
        return new NodeList() {
            public org.w3c.dom.Node item(int index) {
                if (index >= getLength()) {
                    /*
                     * From the NodeList specification: If index is greater than
                     * or equal to the number of nodes in the list, this returns
                     * null.
                     */
                    return null;
                } else {
                    return DOMNodeHelper.asDOMNode((Node) list.get(index));
                }
            }

            public int getLength() {
                return list.size();
            }
        };
    }

    public static org.w3c.dom.Node asDOMNode(Node node) {
        if (node == null) {
            return null;
        }

        if (node instanceof org.w3c.dom.Node) {
            return (org.w3c.dom.Node) node;
        } else {
            // Use DOMWriter?
            System.out.println("Cannot convert: " + node
                    + " into a W3C DOM Node");
            notSupported();

            return null;
        }
    }

    public static org.w3c.dom.Document asDOMDocument(Document document) {
        if (document == null) {
            return null;
        }

        if (document instanceof org.w3c.dom.Document) {
            return (org.w3c.dom.Document) document;
        } else {
            // Use DOMWriter?
            notSupported();

            return null;
        }
    }

    public static org.w3c.dom.DocumentType asDOMDocumentType(DocumentType dt) {
        if (dt == null) {
            return null;
        }

        if (dt instanceof org.w3c.dom.DocumentType) {
            return (org.w3c.dom.DocumentType) dt;
        } else {
            // Use DOMWriter?
            notSupported();

            return null;
        }
    }

    public static org.w3c.dom.Text asDOMText(CharacterData text) {
        if (text == null) {
            return null;
        }

        if (text instanceof org.w3c.dom.Text) {
            return (org.w3c.dom.Text) text;
        } else {
            // Use DOMWriter?
            notSupported();

            return null;
        }
    }

    public static org.w3c.dom.Element asDOMElement(Node element) {
        if (element == null) {
            return null;
        }

        if (element instanceof org.w3c.dom.Element) {
            return (org.w3c.dom.Element) element;
        } else {
            // Use DOMWriter?
            notSupported();

            return null;
        }
    }

    public static org.w3c.dom.Attr asDOMAttr(Node attribute) {
        if (attribute == null) {
            return null;
        }

        if (attribute instanceof org.w3c.dom.Attr) {
            return (org.w3c.dom.Attr) attribute;
        } else {
            // Use DOMWriter?
            notSupported();

            return null;
        }
    }

    /**
     * Called when a method has not been implemented yet
     * 
     * @throws DOMException
     *             DOCUMENT ME!
     */
    public static void notSupported() {
        throw new DOMException(DOMException.NOT_SUPPORTED_ERR,
                "Not supported yet");
    }

    public static class EmptyNodeList implements NodeList {
        public org.w3c.dom.Node item(int index) {
            return null;
        }

        public int getLength() {
            return 0;
        }
    }
}

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 * 
 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
 */