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package org.codehaus.stax2;

import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLStreamException;

/**
 * Extended interface that implements functionality that is missing
 * from {@link XMLEventReader}, based on findings on trying to
 * implement Stax API v1.0.
 */
public interface XMLEventReader2
    extends XMLEventReader
{
    /**
     * Method that is similar to {@link #hasNext}, except that it can
     * throw a {@link XMLStreamException}. This is important distinction,
     * since the underlying stream reader is NOT allowed to throw such an
     * exception when its
     * hasNext() gets called; but the underlying parser
     * may well need to advance the input stream and in doing so may
     * encounter an exception. This exception should be propagated to
     * the caller, as it may signal a problem with the input stream
     * or xml content.
     */
    public boolean hasNextEvent() throws XMLStreamException;

    /*
    ///////////////////////////////////////////////////////////
    // Configuration
    ///////////////////////////////////////////////////////////
    */

    /**
     * Method similar to {@link javax.xml.stream.XMLInputFactory#isPropertySupported}, used
     * to determine whether a property is supported by the Reader
     * instance. This means that this method may return false
     * for some properties that the input factory does support: specifically,
     * it should only return true if the value is mutable on per-instance
     * basis. False means that either the property is not recognized, or
     * is not mutable via reader instance.
     *
     * @since 3.0
     */
    public boolean isPropertySupported(String name);

    /**
     * Method that can be used to set per-reader properties; a subset of
     * properties one can set via matching
     * {@link org.codehaus.stax2.XMLInputFactory2}
     * instance. Exactly which methods are mutable is implementation
     * specific.
     *
     * @param name Name of the property to set
     * @param value Value to set property to.
     *
     * @return True, if the specified property was succesfully
     *    set to specified value; false if its value was not changed
     *
     * @throws InvalidArgumentException if the property is not supported
     *   (or recognized) by the stream reader implementation
     *
     * @since 3.0
     */
    public boolean setProperty(String name, Object value);
}