/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.sql.rowset.serial; import java.sql.*;import java.io.*;import java.util.*; /** * A serialized mapping of a <code>Ref</code> object, which is the mapping in the * Java programming language of an SQL <code>REF</code> value. * <p> * The <code>SerialRef</code> class provides a constructor  for * creating a <code>SerialRef</code> instance from a <code>Ref</code> * object and provides methods for getting and setting the <code>Ref</code> object. */public class SerialRef implements Ref, Serializable, Cloneable {     /**     * String containing the base type name.     * @serial     */    private String baseTypeName;     /**     * This will store the type <code>Ref</code> as an <code>Object</code>.     */    private Object object;     /**     * Private copy of the Ref reference.     */    private Ref reference;     /**     * Constructs a <code>SerialRef</code> object from the given <code>Ref</code>     * object.     *     * @param ref a Ref object; cannot be <code>null</code>     * @throws SQLException if a database access occurs; if <code>ref</code>     *     is <code>null</code>; or if the <code>Ref</code> object returns a     *     <code>null</code> value base type name.     * @throws SerialException if an error occurs serializing the <code>Ref</code>     *     object     */    public SerialRef(Ref ref) throws SerialException, SQLException {        if (ref == null) {            throw new SQLException("Cannot instantiate a SerialRef object " +                "with a null Ref object");        }        reference = ref;        object = ref;        if (ref.getBaseTypeName() == null) {            throw new SQLException("Cannot instantiate a SerialRef object " +                "that returns a null base type name");        } else {            baseTypeName = ref.getBaseTypeName();        }    }     /**     * Returns a string describing the base type name of the <code>Ref</code>.     *     * @return a string of the base type name of the Ref     * @throws SerialException in no Ref object has been set     */    public String getBaseTypeName() throws SerialException {        return baseTypeName;    }     /**     * Returns an <code>Object</code> representing the SQL structured type     * to which this <code>SerialRef</code> object refers.  The attributes     * of the structured type are mapped according to the given type map.     *     * @param map a <code>java.util.Map</code> object containing zero or     *        more entries, with each entry consisting of 1) a <code>String</code>     *        giving the fully qualified name of a UDT and 2) the     *        <code>Class</code> object for the <code>SQLData</code> implementation     *        that defines how the UDT is to be mapped     * @return an object instance resolved from the Ref reference and mapped     *        according to the supplied type map     * @throws SerialException if an error is encountered in the reference     *        resolution     */    public Object getObject(java.util.Map<String,Class<?>> map)        throws SerialException    {        map = new Hashtable(map);        if (object != null) {            return map.get(object);        } else {            throw new SerialException("The object is not set");        }    }     /**     * Returns an <code>Object</code> representing the SQL structured type     * to which this <code>SerialRef</code> object refers.     *     * @return an object instance resolved from the Ref reference     * @throws SerialException if an error is encountered in the reference     *         resolution     */    public Object getObject() throws SerialException {         if (reference != null) {            try {                return reference.getObject();            } catch (SQLException e) {                throw new SerialException("SQLException: " + e.getMessage());            }        }         if (object != null) {            return object;        }          throw new SerialException("The object is not set");     }     /**     * Sets the SQL structured type that this <code>SerialRef</code> object     * references to the given <code>Object</code> object.     *     * @param obj an <code>Object</code> representing the SQL structured type     *        to be referenced     * @throws SerialException if an error is encountered generating the     * the structured type referenced by this <code>SerialRef</code> object     */    public void setObject(Object obj) throws SerialException {        try {            reference.setObject(obj);        } catch (SQLException e) {            throw new SerialException("SQLException: " + e.getMessage());        }        object = obj;    }     /**         * The identifier that assists in the serialization of this <code>SerialRef</code>     * object.     */    static final long serialVersionUID = -4727123500609662274L;  }