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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.processor.output;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.AbstractOutputProcessor;
import org.apache.xml.security.stax.ext.OutputProcessorChain;
import org.apache.xml.security.stax.ext.XMLSecurityConstants;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;
import org.apache.xml.security.stax.impl.XMLSecurityEventWriter;

import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import java.io.OutputStream;

/**
 * Processor which outputs the XMLEvents to an outputStream
 * This Processor can be extended to allow to write to a StAX writer instead of directly to an output stream
 *
 * @author $Author: giger $
 * @version $Revision: 1398806 $ $Date: 2012-10-16 15:01:40 +0100 (Tue, 16 Oct 2012) $
 */
public class FinalOutputProcessor extends AbstractOutputProcessor {

    private XMLEventWriter xmlEventWriter;

    public FinalOutputProcessor(OutputStream outputStream, String encoding) throws XMLSecurityException {
        super();
        setPhase(XMLSecurityConstants.Phase.POSTPROCESSING);
        try {
            xmlEventWriter = new XMLSecurityEventWriter(XMLSecurityConstants.xmlOutputFactory.createXMLStreamWriter(outputStream, encoding));
        } catch (XMLStreamException e) {
            throw new XMLSecurityException(e);
        }
    }

    public FinalOutputProcessor(XMLStreamWriter xmlStreamWriter) throws XMLSecurityException {
        super();
        setPhase(XMLSecurityConstants.Phase.POSTPROCESSING);
        this.xmlEventWriter = new XMLSecurityEventWriter(xmlStreamWriter);
    }

    @Override
    public void processEvent(XMLSecEvent xmlSecEvent, OutputProcessorChain outputProcessorChain) throws XMLStreamException, XMLSecurityException {
        xmlEventWriter.add(xmlSecEvent);
    }

    @Override
    public void doFinal(OutputProcessorChain outputProcessorChain) throws XMLSecurityException {
        try {
            xmlEventWriter.flush();
            xmlEventWriter.close();
        } catch (XMLStreamException e) {
            throw new XMLSecurityException(e);
        }
    }
}