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package org.codehaus.stax2.validation;

import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;

/**
 * Specialized sub-class of {@link XMLStreamException}, to be used for
 * indicating fatal validation problems (when in mode in which exceptions
 * are to be thrown).
 *
 * Note: constructors are protected, since direct instantiation should
 * be done using factory methods. Reason for this is that the base
 * {@link XMLStreamException} has less than robust handling of optional
 * arguments, and thus factory methods of this class can take care to
 * choose appropriate constructors to call, to make sure super-class does
 * not barf (NPE or such).
 */
public class XMLValidationException
    extends XMLStreamException
{
    private static final long serialVersionUID = 1L;

    protected XMLValidationProblem mCause;

    // // Constructors are protected; sub-classes need to know what
    // // they are doing

    protected XMLValidationException(XMLValidationProblem cause)
    {
        super();
        if (cause == null) {
            throwMissing();
        }
        mCause = cause;
    }

    protected XMLValidationException(XMLValidationProblem cause, String msg)
    {
        super(msg);
        if (cause == null) {
            throwMissing();
        }
        mCause = cause;
    }

    protected XMLValidationException(XMLValidationProblem cause, String msg,
                                     Location loc)
    {
        super(msg, loc);
        if (cause == null) {
            throwMissing();
        }
        mCause = cause;
    }

    // // // Factory methods

    public static XMLValidationException createException(XMLValidationProblem cause)
    {
        String msg = cause.getMessage();
        if (msg == null) {
            return new XMLValidationException(cause);
        }
        Location loc = cause.getLocation();
        if (loc == null) {
            return new XMLValidationException(cause, msg);
        }
        return new XMLValidationException(cause, msg, loc);
    }

    // // // Accessors

    /**
     * @return Object that has all information about details of the
     *   validation problem
     */
    public XMLValidationProblem getValidationProblem() {
        return mCause;
    }

    // // // Internal

    protected static void throwMissing()
        throws RuntimeException
    {
        throw new IllegalArgumentException("Validation problem argument can not be null");
    }
}