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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 org.apache.xml.security.stax.ext.stax.XMLSecEvent;

import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;
import java.util.Deque;
import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 */
public class XMLSecurityEventReader implements XMLEventReader {

    private final Iterator xmlSecEventIterator;
    private XMLEvent xmlSecEvent;

    public XMLSecurityEventReader(Deque xmlSecEvents, int fromIndex) {
        this.xmlSecEventIterator = xmlSecEvents.descendingIterator();
        int curIdx = 0;
        while (curIdx++ < fromIndex) {
            this.xmlSecEventIterator.next();
        }
    }

    @Override
    public XMLEvent nextEvent() throws XMLStreamException {
        if (this.xmlSecEvent != null) {
            final XMLEvent currentXMLEvent = this.xmlSecEvent;
            this.xmlSecEvent = null;
            return currentXMLEvent;
        }
        final XMLEvent currentXMLEvent;
        try {
            currentXMLEvent = xmlSecEventIterator.next();
        } catch (NoSuchElementException e) {
            throw new XMLStreamException(e);
        }
        return currentXMLEvent;
    }

    @Override
    public boolean hasNext() {
        if (this.xmlSecEvent != null) {
            return true;
        }
        return xmlSecEventIterator.hasNext();
    }

    @Override
    public XMLEvent peek() throws XMLStreamException {
        if (this.xmlSecEvent != null) {
            return this.xmlSecEvent;
        }
        try {
            this.xmlSecEvent = xmlSecEventIterator.next();
            return this.xmlSecEvent;
        } catch (NoSuchElementException e) {
            return null;
        }
    }

    @Override
    public String getElementText() throws XMLStreamException {
        //ATM not needed and therefore not implemented
        throw new XMLStreamException(new UnsupportedOperationException());
    }

    @Override
    public XMLEvent nextTag() throws XMLStreamException {
        //ATM not needed and therefore not implemented
        throw new XMLStreamException(new UnsupportedOperationException());
    }

    @Override
    public Object getProperty(String name) throws IllegalArgumentException {
        //ATM not needed and therefore not implemented
        throw new IllegalArgumentException(new UnsupportedOperationException());
    }

    @Override
    public void close() throws XMLStreamException {
        //nop
    }

    @Override
    public Object next() {
        try {
            return nextEvent();
        } catch (XMLStreamException e) {
            throw new NoSuchElementException(e.getMessage());
        }
    }

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