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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.stax.impl;

import java.util.List;

import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.Comment;
import javax.xml.stream.events.DTD;
import javax.xml.stream.events.EntityReference;
import javax.xml.stream.events.Namespace;
import javax.xml.stream.events.ProcessingInstruction;
import javax.xml.stream.events.StartDocument;
import javax.xml.stream.events.XMLEvent;

import org.apache.xml.security.stax.ext.stax.XMLSecAttribute;
import org.apache.xml.security.stax.ext.stax.XMLSecCharacters;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;
import org.apache.xml.security.stax.ext.stax.XMLSecNamespace;
import org.apache.xml.security.stax.ext.stax.XMLSecStartElement;

/**
 */
public class XMLSecurityEventWriter implements XMLEventWriter {

    private final XMLStreamWriter xmlStreamWriter;

    public XMLSecurityEventWriter(XMLStreamWriter xmlStreamWriter) {
        this.xmlStreamWriter = xmlStreamWriter;
    }

    @Override
    public void add(XMLEvent event) throws XMLStreamException {
        if (!(event instanceof XMLSecEvent)) {
            throw new IllegalArgumentException("XMLEvent must be an instance of XMLSecEvent");
        }

        XMLSecEvent xmlSecEvent = (XMLSecEvent)event;
        switch (xmlSecEvent.getEventType()) {
            case XMLStreamConstants.START_ELEMENT:
                XMLSecStartElement xmlSecStartElement = xmlSecEvent.asStartElement();
                QName n = xmlSecStartElement.getName();
                this.xmlStreamWriter.writeStartElement(n.getPrefix(), n.getLocalPart(), n.getNamespaceURI());

                List xmlSecNamespaces = xmlSecStartElement.getOnElementDeclaredNamespaces();
                for (XMLSecNamespace namespace : xmlSecNamespaces) {
                    add(namespace);
                }

                List xmlSecAttributes = xmlSecStartElement.getOnElementDeclaredAttributes();
                for (XMLSecAttribute xmlSecAttribute : xmlSecAttributes) {
                    add(xmlSecAttribute);
                }
                break;

            case XMLStreamConstants.END_ELEMENT:
                this.xmlStreamWriter.writeEndElement();
                break;

            case XMLStreamConstants.PROCESSING_INSTRUCTION:
                ProcessingInstruction pi = (ProcessingInstruction) xmlSecEvent;
                this.xmlStreamWriter.writeProcessingInstruction(pi.getTarget(), pi.getData());
                break;

            case XMLStreamConstants.CHARACTERS:
                XMLSecCharacters characters = xmlSecEvent.asCharacters();
                if (!characters.isCData()) {
                    final char[] text = characters.getText();
                    this.xmlStreamWriter.writeCharacters(text, 0, text.length);
                } else {
                    this.xmlStreamWriter.writeCData(characters.getData());
                }
                break;

            case XMLStreamConstants.COMMENT:
                this.xmlStreamWriter.writeComment(((Comment) xmlSecEvent).getText());
                break;

            case XMLStreamConstants.START_DOCUMENT:
                StartDocument startDocument = (StartDocument) xmlSecEvent;
                if (!startDocument.encodingSet()) {
                    this.xmlStreamWriter.writeStartDocument(startDocument.getVersion());
                } else {
                    this.xmlStreamWriter.writeStartDocument(startDocument.getCharacterEncodingScheme(), startDocument.getVersion());
                }
                break;

            case XMLStreamConstants.END_DOCUMENT:
                this.xmlStreamWriter.writeEndDocument();
                break;

            case XMLStreamConstants.ENTITY_REFERENCE:
                this.xmlStreamWriter.writeEntityRef(((EntityReference) xmlSecEvent).getName());
                break;

            case XMLStreamConstants.ATTRIBUTE:
                Attribute attribute = (Attribute) xmlSecEvent;
                QName name = attribute.getName();
                this.xmlStreamWriter.writeAttribute(name.getPrefix(), name.getNamespaceURI(), name.getLocalPart(), attribute.getValue());
                break;

            case XMLStreamConstants.DTD:
                this.xmlStreamWriter.writeDTD(((DTD) xmlSecEvent).getDocumentTypeDeclaration());
                break;

            case XMLStreamConstants.CDATA:
                this.xmlStreamWriter.writeCData(xmlSecEvent.asCharacters().getData());
                break;

            case XMLStreamConstants.NAMESPACE:
                Namespace ns = (Namespace) xmlSecEvent;
                this.xmlStreamWriter.writeNamespace(ns.getPrefix(), ns.getNamespaceURI());
                break;

            case XMLStreamConstants.SPACE:
            case XMLStreamConstants.NOTATION_DECLARATION:
            case XMLStreamConstants.ENTITY_DECLARATION:
            default:
                throw new XMLStreamException("Illegal event");
        }
    }

    @Override
    public void add(XMLEventReader reader) throws XMLStreamException {
        while (reader.hasNext()) {
            add(reader.nextEvent());
        }
    }

    @Override
    public void close() throws XMLStreamException {
        this.xmlStreamWriter.close();
    }

    @Override
    public void flush() throws XMLStreamException {
        this.xmlStreamWriter.flush();
    }

    @Override
    public NamespaceContext getNamespaceContext() {
        return this.xmlStreamWriter.getNamespaceContext();
    }

    @Override
    public String getPrefix(String uri) throws XMLStreamException {
        return this.xmlStreamWriter.getPrefix(uri);
    }

    @Override
    public void setDefaultNamespace(String uri) throws XMLStreamException {
        this.xmlStreamWriter.setDefaultNamespace(uri);
    }

    @Override
    public void setNamespaceContext(NamespaceContext namespaceContext) throws XMLStreamException {
        this.xmlStreamWriter.setNamespaceContext(namespaceContext);
    }

    @Override
    public void setPrefix(String prefix, String uri) throws XMLStreamException {
        this.xmlStreamWriter.setPrefix(prefix, uri);
    }
}