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Stax2 API is an extension to basic Stax 1.0 API that adds significant new functionality, such as full-featured bi-direction validation interface and high-performance Typed Access API.
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package org.codehaus.stax2.ri.evt;

import java.io.IOException;
import java.io.Writer;

import javax.xml.stream.*;
import javax.xml.stream.events.StartDocument;

import org.codehaus.stax2.XMLStreamWriter2;

public class StartDocumentEventImpl
    extends BaseEventImpl
    implements StartDocument
{
    private final boolean mStandaloneSet;
    private final boolean mIsStandalone;
    private final String mVersion;
    private final boolean mEncodingSet;
    private final String mEncodingScheme;
    private final String mSystemId;

    public StartDocumentEventImpl(Location loc, XMLStreamReader r)
    {
        super(loc);
        mStandaloneSet = r.standaloneSet();
        mIsStandalone = r.isStandalone();
        /* 06-Aug-2006, TSa: Specs (class javadoc) actually specify that
         *   the default should be "1.0", as opposed to stream reader that
         *   should return null if no declaration exists. So, let's do
         *   defaulting here if needed
         */
        {
            String version = r.getVersion();
            if (version == null || version.length() == 0) {
                version = "1.0";
            }
            mVersion = version;
        }
        mEncodingScheme = r.getCharacterEncodingScheme();
        mEncodingSet = (mEncodingScheme != null && mEncodingScheme.length() > 0);
        mSystemId = (loc != null) ? loc.getSystemId() : "";
    }

    /**
     * Method called by event factory, when constructing start document
     * event.
     */
    public StartDocumentEventImpl(Location loc)
    {
        this(loc, (String) null);
    }

    public StartDocumentEventImpl(Location loc, String encoding)
    {
        this(loc, encoding, null);
    }

    public StartDocumentEventImpl(Location loc, String encoding, String version)
    {
        this(loc, encoding, version, false, false);
    }

    public StartDocumentEventImpl(Location loc, String encoding, String version,
                                  boolean standaloneSet, boolean isStandalone)
    {
        super(loc);
        mEncodingScheme = encoding;
        mEncodingSet = (encoding != null && encoding.length() > 0);
        mVersion = version;
        mStandaloneSet = standaloneSet;
        mIsStandalone = isStandalone;
        mSystemId = "";
    }

    @Override
    public boolean encodingSet() {
        return mEncodingSet;
    }

    @Override
    public String getCharacterEncodingScheme() {
        return mEncodingScheme;
    }

    @Override
    public String getSystemId() {
        return mSystemId;
    }

    @Override
    public String getVersion() {
        return mVersion;
    }

    @Override
    public boolean isStandalone() {
        return mIsStandalone;
    }

    @Override
    public boolean standaloneSet() {
        return mStandaloneSet;
    }

    /*
    /**********************************************************************
    /* Implementation of abstract base methods
    /**********************************************************************
     */

    @Override
    public int getEventType() {
        return START_DOCUMENT;
    }

    @Override
    public boolean isStartDocument() {
        return true;
    }

    @Override
    public void writeAsEncodedUnicode(Writer w)
        throws XMLStreamException
    {
        // Need to output the XML declaration?
        try {
            w.write("");
        } catch (IOException ie) {
            throwFromIOE(ie);
        }
    }

    @Override
    public void writeUsing(XMLStreamWriter2 w) throws XMLStreamException
    {
        w.writeStartDocument();
    }

    /*
    /**********************************************************************
    /* Standard method impl
    /**********************************************************************
     */

    @Override
    public boolean equals(Object o)
    {
        if (o == this) return true;
        if (o == null) return false;
        if (!(o instanceof StartDocument)) return false;

        StartDocument other = (StartDocument) o;

        return (encodingSet() == other.encodingSet())
            && (isStandalone() == other.isStandalone())
            && (standaloneSet() == other.standaloneSet())
            && stringsWithNullsEqual(getCharacterEncodingScheme(), other.getCharacterEncodingScheme())
            && stringsWithNullsEqual(getSystemId(), other.getSystemId())
            && stringsWithNullsEqual(getVersion(), other.getVersion())
            ;
    }

    @Override
    public int hashCode()
    {
        int hash = 0;

        if (encodingSet()) ++hash;
        if (isStandalone()) --hash;
        if (standaloneSet()) hash ^= 1;
        if (mVersion != null) hash ^= mVersion.hashCode();
        if (mEncodingScheme != null) hash ^= mEncodingScheme.hashCode();
        if (mSystemId != null) hash ^= mSystemId.hashCode();
        return hash;
    }
}