xmlwriter.java

解决如何把XML应用到JAVA里问题

     * @param text
     *            is the text to output
     * 
     * @throws IOException
     *             DOCUMENT ME!
     */
    public void write(String text) throws IOException {
        writeString(text);

        if (autoFlush) {
            flush();
        }
    }

    /**
     * Writes the given {@link Text}.
     * 
     * @param text
     *            <code>Text</code> to output.
     * 
     * @throws IOException
     *             DOCUMENT ME!
     */
    public void write(Text text) throws IOException {
        writeString(text.getText());

        if (autoFlush) {
            flush();
        }
    }

    /**
     * Writes the given {@link Node}.
     * 
     * @param node
     *            <code>Node</code> to output.
     * 
     * @throws IOException
     *             DOCUMENT ME!
     */
    public void write(Node node) throws IOException {
        writeNode(node);

        if (autoFlush) {
            flush();
        }
    }

    /**
     * Writes the given object which should be a String, a Node or a List of
     * Nodes.
     * 
     * @param object
     *            is the object to output.
     * 
     * @throws IOException
     *             DOCUMENT ME!
     */
    public void write(Object object) throws IOException {
        if (object instanceof Node) {
            write((Node) object);
        } else if (object instanceof String) {
            write((String) object);
        } else if (object instanceof List) {
            List list = (List) object;

            for (int i = 0, size = list.size(); i < size; i++) {
                write(list.get(i));
            }
        } else if (object != null) {
            throw new IOException("Invalid object: " + object);
        }
    }

    /**
     * <p>
     * Writes the opening tag of an {@link Element}, including its {@link
     * Attribute}s but without its content.
     * </p>
     * 
     * @param element
     *            <code>Element</code> to output.
     * 
     * @throws IOException
     *             DOCUMENT ME!
     */
    public void writeOpen(Element element) throws IOException {
        writer.write("<");
        writer.write(element.getQualifiedName());
        writeAttributes(element);
        writer.write(">");
    }

    /**
     * <p>
     * Writes the closing tag of an {@link Element}
     * </p>
     * 
     * @param element
     *            <code>Element</code> to output.
     * 
     * @throws IOException
     *             DOCUMENT ME!
     */
    public void writeClose(Element element) throws IOException {
        writeClose(element.getQualifiedName());
    }

    // XMLFilterImpl methods
    // -------------------------------------------------------------------------
    public void parse(InputSource source) throws IOException, SAXException {
        installLexicalHandler();
        super.parse(source);
    }

    public void setProperty(String name, Object value)
            throws SAXNotRecognizedException, SAXNotSupportedException {
        for (int i = 0; i < LEXICAL_HANDLER_NAMES.length; i++) {
            if (LEXICAL_HANDLER_NAMES[i].equals(name)) {
                setLexicalHandler((LexicalHandler) value);

                return;
            }
        }

        super.setProperty(name, value);
    }

    public Object getProperty(String name) throws SAXNotRecognizedException,
            SAXNotSupportedException {
        for (int i = 0; i < LEXICAL_HANDLER_NAMES.length; i++) {
            if (LEXICAL_HANDLER_NAMES[i].equals(name)) {
                return getLexicalHandler();
            }
        }

        return super.getProperty(name);
    }

    public void setLexicalHandler(LexicalHandler handler) {
        if (handler == null) {
            throw new NullPointerException("Null lexical handler");
        } else {
            this.lexicalHandler = handler;
        }
    }

    public LexicalHandler getLexicalHandler() {
        return lexicalHandler;
    }

    // ContentHandler interface
    // -------------------------------------------------------------------------
    public void setDocumentLocator(Locator locator) {
        super.setDocumentLocator(locator);
    }

    public void startDocument() throws SAXException {
        try {
            writeDeclaration();
            super.startDocument();
        } catch (IOException e) {
            handleException(e);
        }
    }

    public void endDocument() throws SAXException {
        super.endDocument();

        if (autoFlush) {
            try {
                flush();
            } catch (IOException e) {
            }
        }
    }

    public void startPrefixMapping(String prefix, String uri)
            throws SAXException {
        if (namespacesMap == null) {
            namespacesMap = new HashMap();
        }

        namespacesMap.put(prefix, uri);
        super.startPrefixMapping(prefix, uri);
    }

    public void endPrefixMapping(String prefix) throws SAXException {
        super.endPrefixMapping(prefix);
    }

    public void startElement(String namespaceURI, String localName,
            String qName, Attributes attributes) throws SAXException {
        try {
            charsAdded = false;

            writePrintln();
            indent();
            writer.write("<");
            writer.write(qName);
            writeNamespaces();
            writeAttributes(attributes);
            writer.write(">");
            ++indentLevel;
            lastOutputNodeType = Node.ELEMENT_NODE;
            lastElementClosed = false;

            super.startElement(namespaceURI, localName, qName, attributes);
        } catch (IOException e) {
            handleException(e);
        }
    }

    public void endElement(String namespaceURI, String localName, String qName)
            throws SAXException {
        try {
            charsAdded = false;
            --indentLevel;

            if (lastElementClosed) {
                writePrintln();
                indent();
            }

            // XXXX: need to determine this using a stack and checking for
            // content / children
            boolean hadContent = true;

            if (hadContent) {
                writeClose(qName);
            } else {
                writeEmptyElementClose(qName);
            }

            lastOutputNodeType = Node.ELEMENT_NODE;
            lastElementClosed = true;

            super.endElement(namespaceURI, localName, qName);
        } catch (IOException e) {
            handleException(e);
        }
    }

    public void characters(char[] ch, int start, int length)
            throws SAXException {
        if ((ch == null) || (ch.length == 0) || (length <= 0)) {
            return;
        }

        try {
            /*
             * we can't use the writeString method here because it's possible we
             * don't receive all characters at once and calling writeString
             * would cause unwanted spaces to be added in between these chunks
             * of character arrays.
             */
            String string = String.valueOf(ch, start, length);

            if (escapeText) {
                string = escapeElementEntities(string);
            }

            if (format.isTrimText()) {
                if ((lastOutputNodeType == Node.TEXT_NODE) && !charsAdded) {
                    writer.write(' ');
                } else if (charsAdded && Character.isWhitespace(lastChar)) {
                    writer.write(' ');
                } else if (lastOutputNodeType == Node.ELEMENT_NODE
                        && format.isPadText() && lastElementClosed
                        && Character.isWhitespace(ch[0])) {
                    writer.write(PAD_TEXT);
                }

                String delim = "";
                StringTokenizer tokens = new StringTokenizer(string);

                while (tokens.hasMoreTokens()) {
                    writer.write(delim);
                    writer.write(tokens.nextToken());
                    delim = " ";
                }
            } else {
                writer.write(string);
            }

            charsAdded = true;
            lastChar = ch[(start + length) - 1];
            lastOutputNodeType = Node.TEXT_NODE;

            super.characters(ch, start, length);
        } catch (IOException e) {
            handleException(e);
        }
    }

    public void ignorableWhitespace(char[] ch, int start, int length)
            throws SAXException {
        super.ignorableWhitespace(ch, start, length);
    }

    public void processingInstruction(String target, String data)
            throws SAXException {
        try {
            indent();
            writer.write("<?");
            writer.write(target);
            writer.write(" ");
            writer.write(data);
            writer.write("?>");
            writePrintln();
            lastOutputNodeType = Node.PROCESSING_INSTRUCTION_NODE;

            super.processingInstruction(target, data);
        } catch (IOException e) {
            handleException(e);
        }
    }

    // DTDHandler interface
    // -------------------------------------------------------------------------
    public void notationDecl(String name, String publicID, String systemID)
            throws SAXException {
        super.notationDecl(name, publicID, systemID);
    }

    public void unparsedEntityDecl(String name, String publicID,
            String systemID, String notationName) throws SAXException {
        super.unparsedEntityDecl(name, publicID, systemID, notationName);
    }

    // LexicalHandler interface
    // -------------------------------------------------------------------------
    public void startDTD(String name, String publicID, String systemID)
            throws SAXException {
        inDTD = true;

        try {
            writeDocType(name, publicID, systemID);
        } catch (IOException e) {
            handleException(e);
        }

        if (lexicalHandler != null) {
            lexicalHandler.startDTD(name, publicID, systemID);
        }
    }

    public void endDTD() throws SAXException {
        inDTD = false;

        if (lexicalHandler != null) {
            lexicalHandler.endDTD();
        }
    }

    public void startCDATA() throws SAXException {
        try {
            writer.write("<![CDATA[");
        } catch (IOException e) {
            handleException(e);
        }

        if (lexicalHandler != null) {
            lexicalHandler.startCDATA();
        }
    }

    public void endCDATA() throws SAXException {
        try {
            writer.write("]]>");
        } catch (IOException e) {
            handleException(e);
        }

        if (lexicalHandler != null) {
            lexicalHandler.endCDATA();
        }
    }

    public void startEntity(String name) throws SAXException {
        try {
            writeEntityRef(name);
        } catch (IOException e) {
            handleException(e);
        }

        if (lexicalHandler != null) {
            lexicalHandler.startEntity(name);
        }
    }

    public void endEntity(String name) throws SAXException {
        if (lexicalHandler != null) {
            lexicalHandler.endEntity(name);
        }
    }

    public void comment(char[] ch, int start, int length) throws SAXException {
        if (showCommentsInDTDs || !inDTD) {
            try {
                charsAdded = false;
                writeComment(new String(ch, start, length));
            } catch (IOException e) {
                handleException(e);
            }
        }

        if (lexicalHandler != null) {
            lexicalHandler.comment(ch, start, length);
        }
    }

    // Implementation methods
    // -------------------------------------------------------------------------
    protected void writeElement(Element element) throws IOException {
        int size = element.nodeCount();
        String qualifiedName = element.getQualifiedName();

        writePrintln();
        indent();

        writer.write("<");
        writer.write(qualifiedName);

        int previouslyDeclaredNamespaces = namespaceStack.size();
        Namespace ns = element.getNamespace();

        if (isNamespaceDeclaration(ns)) {
            namespaceStack.push(ns);
            writeNamespace(ns);
        }

        // Print out additional namespace declarations
        boolean textOnly = true;

        for (int i = 0; i < size; i++) {
            Node node = element.node(i);

            if (node instanceof Namespace) {
                Namespace additional = (Namespace) node;

                if (isNamespaceDeclaration(additional)) {
                    namespaceStack.push(additional);
                    writeNamespace(additional);
                }
            } else if (node instanceof Element) {
                textOnly = false;
            } else if (node instanceof Comment) {
                textOnly = false;
            }
        }

        writeAttributes(element);

        lastOutputNodeType = Node.ELEMENT_NODE;

        if (size <= 0) {
            writeEmptyElementClose(qualifiedName);
        } else {
            writer.write(">");

            if (textOnly) {
                // we have at least one text node so lets assume
                // that its non-empty
                writeElementContent(element);
            } else {
                // we know it's not null or empty from above
                ++indentLevel;

                writeElementContent(element);

                --indentLevel;

                writePrintln();
                indent();
            }

            writer.write("</");
            writer.write(qualifiedName);
            writer.write(">");
        }

        // remove declared namespaceStack from stack
        while (namespaceStack.size() > previouslyDeclaredNamespaces) {