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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.io;

import java.io.*;
import java.net.URL;

/**
 * This is the mid-level abstract base class for {@link Stax2Source}s
 * that an be used to access fixed-length in-memory data sources, such
 * as byte and char arrays, Strings, StringBuffers and so forth.
 * The main reason for using such a source object (instead of constructing
 * wrapper Readers or InputStreams) is that concrete implementations
 * usually also allow more direct access to the underlying data, so
 * that stream reader implementations may be able to do more optimal
 * access.
 */
public abstract class Stax2BlockSource
    extends Stax2Source
{
    protected Stax2BlockSource() { }

    /*
    /////////////////////////////////////////
    // Public API, simple accessors/mutators
    /////////////////////////////////////////
     */

    /**
     * Usually there is no way to refer to the underlying data source,
     * since they are in-memory data structures. Because of this, the
     * base implementation just returns null.
     */
    public URL getReference() {
        return null;
    }

    public abstract Reader constructReader() throws IOException;

    public abstract InputStream constructInputStream() throws IOException;
}