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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.ext;

import org.apache.xml.security.exceptions.XMLSecurityException;

import javax.xml.stream.XMLStreamException;

/**
 * Basic interface for Output- and Input-Processor chains
 *
 * @author $Author: giger $
 * @version $Revision: 1544623 $ $Date: 2013-11-22 18:05:02 +0000 (Fri, 22 Nov 2013) $
 */
public interface ProcessorChain {

    /**
     * resets the chain so that the next event will go again to the first processor in the chain.
     */
    void reset();

    /**
     * Will finally be called when the whole document is processed
     * Important note: Every processor in the chain has to call doFinal() in its own doFinal() method.
     * InputProcessors should call it before doing other stuff to keep the processing order. Remember the
     * input-chain is in principle processed in the reverse order since we "leech" the events through the chain.
     * So that means that we should do the same for the doFinal method, otherwise we may run into troubles.
     *
     * @throws XMLStreamException   thrown when a streaming error occurs
     * @throws XMLSecurityException thrown when a Security failure occurs
     */
    void doFinal() throws XMLStreamException, XMLSecurityException;
}