staxeventwriter.java

解决如何把XML应用到JAVA里问题

     * @param ns
     *            The {@link Namespace}from which to construct the event.
     * 
     * @return The constructed {@link javax.xml.stream.events.Namespace}event.
     */
    public javax.xml.stream.events.Namespace createNamespace(Namespace ns) {
        String prefix = ns.getPrefix();
        String uri = ns.getURI();

        return factory.createNamespace(prefix, uri);
    }

    /**
     * Writes a DOM4J {@link Text}to the stream.
     * 
     * @param text
     *            The {@link Text}to write to the stream.
     * 
     * @throws XMLStreamException
     *             If an error occurs writing to the stream.
     */
    public void writeText(Text text) throws XMLStreamException {
        consumer.add(createCharacters(text));
    }

    /**
     * Constructs a STAX {@link Characters}event from a DOM4J {@link Text}.
     * 
     * @param text
     *            The {@link Text}from which to construct the event.
     * 
     * @return The constructed {@link Characters}event.
     */
    public Characters createCharacters(Text text) {
        return factory.createCharacters(text.getText());
    }

    /**
     * Writes a DOM4J {@link CDATA}to the event stream.
     * 
     * @param cdata
     *            The {@link CDATA}to write to the stream.
     * 
     * @throws XMLStreamException
     *             If an error occurs writing to the stream.
     */
    public void writeCDATA(CDATA cdata) throws XMLStreamException {
        consumer.add(createCharacters(cdata));
    }

    /**
     * Constructs a STAX {@link Characters}event from a DOM4J {@link CDATA}.
     * 
     * @param cdata
     *            The {@link CDATA}from which to construct the event.
     * 
     * @return The newly constructed {@link Characters}event.
     */
    public Characters createCharacters(CDATA cdata) {
        return factory.createCData(cdata.getText());
    }

    /**
     * Writes a DOM4J {@link Comment}to the stream.
     * 
     * @param comment
     *            The {@link Comment}to write to the stream.
     * 
     * @throws XMLStreamException
     *             If an error occurs writing to the stream.
     */
    public void writeComment(Comment comment) throws XMLStreamException {
        consumer.add(createComment(comment));
    }

    /**
     * Constructs a STAX {@link javax.xml.stream.events.Comment}event from a
     * DOM4J {@link Comment}.
     * 
     * @param comment
     *            The {@link Comment}from which to construct the event.
     * 
     * @return The constructed {@link javax.xml.stream.events.Comment}event.
     */
    public javax.xml.stream.events.Comment createComment(Comment comment) {
        return factory.createComment(comment.getText());
    }

    /**
     * Writes a DOM4J {@link ProcessingInstruction}to the stream.
     * 
     * @param pi
     *            The {@link ProcessingInstruction}to write to the stream.
     * 
     * @throws XMLStreamException
     *             If an error occurs writing to the stream.
     */
    public void writeProcessingInstruction(org.dom4j.ProcessingInstruction pi)
            throws XMLStreamException {
        consumer.add(createProcessingInstruction(pi));
    }

    /**
     * Constructs a STAX {@link javax.xml.stream.events.ProcessingInstruction}
     * event from a DOM4J {@link ProcessingInstruction}.
     * 
     * @param pi
     *            The {@link ProcessingInstruction}from which to construct the
     *            event.
     * 
     * @return The constructed {@link
     *         javax.xml.stream.events.ProcessingInstruction} event.
     */
    public ProcessingInstruction createProcessingInstruction(
            org.dom4j.ProcessingInstruction pi) {
        String target = pi.getTarget();
        String data = pi.getText();

        return factory.createProcessingInstruction(target, data);
    }

    /**
     * Writes a DOM4J {@link Entity}to the stream.
     * 
     * @param entity
     *            The {@link Entity}to write to the stream.
     * 
     * @throws XMLStreamException
     *             If an error occurs writing to the stream.
     */
    public void writeEntity(Entity entity) throws XMLStreamException {
        consumer.add(createEntityReference(entity));
    }

    /**
     * Constructs a STAX {@link EntityReference}event from a DOM4J {@link
     * Entity}.
     * 
     * @param entity
     *            The {@link Entity}from which to construct the event.
     * 
     * @return The constructed {@link EntityReference}event.
     */
    private EntityReference createEntityReference(Entity entity) {
        return factory.createEntityReference(entity.getName(), null);
    }

    /**
     * Writes a DOM4J {@link DocumentType}to the stream.
     * 
     * @param docType
     *            The {@link DocumentType}to write to the stream.
     * 
     * @throws XMLStreamException
     *             If an error occurs writing to the stream.
     */
    public void writeDocumentType(DocumentType docType)
            throws XMLStreamException {
        consumer.add(createDTD(docType));
    }

    /**
     * Constructs a STAX {@link DTD}event from a DOM4J {@link DocumentType}.
     * 
     * @param docType
     *            The {@link DocumentType}from which to construct the event.
     * 
     * @return The constructed {@link DTD}event.
     * 
     * @throws RuntimeException
     *             DOCUMENT ME!
     */
    public DTD createDTD(DocumentType docType) {
        StringWriter decl = new StringWriter();

        try {
            docType.write(decl);
        } catch (IOException e) {
            throw new RuntimeException("Error writing DTD", e);
        }

        return factory.createDTD(decl.toString());
    }

    /**
     * Writes a DOM4J {@link Document}node, and all its contents, to the
     * stream.
     * 
     * @param doc
     *            The {@link Document}to write to the stream.
     * 
     * @throws XMLStreamException
     *             If an error occurs writing to the stream.
     */
    public void writeDocument(Document doc) throws XMLStreamException {
        consumer.add(createStartDocument(doc));

        writeChildNodes(doc);

        consumer.add(createEndDocument(doc));
    }

    /**
     * Constructs a STAX {@link StartDocument}event from a DOM4J {@link
     * Document}.
     * 
     * @param doc
     *            The {@link Document}from which to construct the event.
     * 
     * @return The constructed {@link StartDocument}event.
     */
    public StartDocument createStartDocument(Document doc) {
        String encoding = doc.getXMLEncoding();

        if (encoding != null) {
            return factory.createStartDocument(encoding);
        } else {
            return factory.createStartDocument();
        }
    }

    /**
     * Constructs a STAX {@link EndDocument}event from a DOM4J {@link
     * Document}.
     * 
     * @param doc
     *            The {@link Document}from which to construct the event.
     * 
     * @return The constructed {@link EndDocument}event.
     */
    public EndDocument createEndDocument(Document doc) {
        return factory.createEndDocument();
    }

    /**
     * Constructs a STAX {@link QName}from a DOM4J {@link org.dom4j.QName}.
     * 
     * @param qname
     *            The {@link org.dom4j.QName}from which to construct the STAX
     *            {@link QName}.
     * 
     * @return The constructed {@link QName}.
     */
    public QName createQName(org.dom4j.QName qname) {
        return new QName(qname.getNamespaceURI(), qname.getName(), qname
                .getNamespacePrefix());
    }

    /**
     * Internal {@link Iterator}implementation used to pass DOM4J {@link
     * Attribute}s to the stream.
     */
    private class AttributeIterator implements Iterator {
        /** The underlying DOm4J attribute iterator. */
        private Iterator iter;

        public AttributeIterator(Iterator iter) {
            this.iter = iter;
        }

        public boolean hasNext() {
            return iter.hasNext();
        }

        public Object next() {
            Attribute attr = (Attribute) iter.next();
            QName attrName = createQName(attr.getQName());
            String value = attr.getValue();

            return factory.createAttribute(attrName, value);
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    }

    /**
     * Internal {@link Iterator}implementation used to pass DOM4J {@link
     * Namespace}s to the stream.
     */
    private class NamespaceIterator implements Iterator {
        private Iterator iter;

        public NamespaceIterator(Iterator iter) {
            this.iter = iter;
        }

        public boolean hasNext() {
            return iter.hasNext();
        }

        public Object next() {
            Namespace ns = (Namespace) iter.next();
            String prefix = ns.getPrefix();
            String nsURI = ns.getURI();

            return factory.createNamespace(prefix, nsURI);
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    }
}

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