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 *

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package javax.sql.rowset.spi;

import java.sql.SQLException;

import javax.sql.rowset.*;

/**

 * Indicates an error with the <code>SyncProvider</code> mechanism. This exception

 * is created by a <code>SyncProvider</code> abstract class extension if it

 * encounters violations in reading from or writing to the originating data source.

 * <P>

 * If it is implemented to do so, the <code>SyncProvider</code> object may also create a

 * <code>SyncResolver</code> object and either initialize the <code>SyncProviderException</code>

 * object with it at construction time or set it with the <code>SyncProvider</code> object at

 * a later time.

 * <P>

 * The method <code>acceptChanges</code> will throw this exception after the writer

 * has finished checking for conflicts and has found one or more conflicts. An

 * application may catch a <code>SyncProviderException</code> object and call its

 * <code>getSyncResolver</code> method to get its <code>SyncResolver</code> object.

 * See the code fragment in the interface comment for

 * <a href="SyncResolver.html"><code>SyncResolver</code></a> for an example.

 * This <code>SyncResolver</code> object will mirror the <code>RowSet</code>

 * object that generated the exception, except that it will contain only the values

 * from the data source that are in conflict.  All other values in the <code>SyncResolver</code>

 * object will be <code>null</code>.

 * <P>

 * The <code>SyncResolver</code> object may be used to examine and resolve

 * each conflict in a row and then go to the next row with a conflict to

 * repeat the procedure.

 * <P>

 * A <code>SyncProviderException</code> object may or may not contain a description of the

 * condition causing the exception.  The inherited method <code>getMessage</code> may be

 * called to retrieve the description if there is one.

 *

 * @author Jonathan Bruce

 * @see javax.sql.rowset.spi.SyncFactory

 * @see javax.sql.rowset.spi.SyncResolver

 * @see javax.sql.rowset.spi.SyncFactoryException

 * @since 1.5

 */

public class SyncProviderException extends java.sql.SQLException {

    /**

     * The instance of <code>javax.sql.rowset.spi.SyncResolver</code> that

     * this <code>SyncProviderException</code> object will return when its

     * <code>getSyncResolver</code> method is called.

     */

     private SyncResolver syncResolver = null;

    /**

     * Creates a new <code>SyncProviderException</code> object without a detail message.

     */

    public SyncProviderException() {

        super();

    }

    /**

     * Constructs a <code>SyncProviderException</code> object with the specified

     * detail message.

     *

     * @param msg the detail message

     */

    public SyncProviderException(String msg)  {

        super(msg);

    }

    /**

     * Constructs a <code>SyncProviderException</code> object with the specified

     * <code>SyncResolver</code> instance.

     *

     * @param syncResolver the <code>SyncResolver</code> instance used to

     *     to process the synchronization conflicts

     * @throws IllegalArgumentException if the <code>SyncResolver</code> object

     *     is <code>null</code>.

     */

    public SyncProviderException(SyncResolver syncResolver)  {

        if (syncResolver == null) {

            throw new IllegalArgumentException("Cannot instantiate a SyncProviderException " +

                "with a null SyncResolver object");

        } else {

            this.syncResolver = syncResolver;

        }

    }

    /**

     * Retrieves the <code>SyncResolver</code> object that has been set for

     * this <code>SyncProviderException</code> object, or

     * if none has been set, an instance of the default <code>SyncResolver</code>

     * implementation included in the reference implementation.

     * <P>

     * If a <code>SyncProviderException</code> object is thrown, an application

     * may use this method to generate a <code>SyncResolver</code> object

     * with which to resolve the conflict or conflicts that caused the

     * exception to be thrown.

     *

     * @return the <code>SyncResolver</code> object set for this

     *     <code>SyncProviderException</code> object or, if none has

     *     been set, an instance of the default <code>SyncResolver</code>

     *     implementation. In addition, the default <code>SyncResolver</code>

     *     implementation is also returned if the <code>SyncResolver()</code> or

     *     <code>SyncResolver(String)</code> constructors are used to instantiate

     *     the <code>SyncResolver</code> instance.

     */

    public SyncResolver getSyncResolver() {

        if (syncResolver != null) {

            return syncResolver;

        } else {

            try {

              syncResolver = new com.sun.rowset.internal.SyncResolverImpl();

            } catch (SQLException sqle) {

            }

            return syncResolver;

        }

    }

    /**

     * Sets the <code>SyncResolver</code> object for this

     * <code>SyncProviderException</code> object to the one supplied.

     * If the argument supplied is <code>null</code>, a call to the method

     * <code>getSyncResolver</code> will return the default reference

     * implementation of the <code>SyncResolver</code> interface.

     *

     * @param syncResolver the <code>SyncResolver</code> object to be set;

     *     cannot be <code>null</code>

     * @throws IllegalArgumentException if the <code>SyncResolver</code> object

     *     is <code>null</code>.

     * @see #getSyncResolver

     */

    public void setSyncResolver(SyncResolver syncResolver) {

        if (syncResolver == null) {

            throw new IllegalArgumentException("Cannot set a null SyncResolver " +

                "object");

        } else {

            this.syncResolver = syncResolver;

        }

    }

    static final long serialVersionUID = -939908523620640692L;

}