001 /*
002 * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package javax.sql.rowset.serial;
027
028 import java.sql.*;
029 import java.io.*;
030 import java.net.URL;
031
032 /**
033 * A serialized mapping in the Java programming language of an SQL
034 * <code>DATALINK</code> value. A <code>DATALINK</code> value
035 * references a file outside of the underlying data source that the
036 * data source manages.
037 * <P>
038 * <code>RowSet</code> implementations can use the method <code>RowSet.getURL</code>
039 * to retrieve a <code>java.net.URL</code> object, which can be used
040 * to manipulate the external data.
041 * <pre>
042 * java.net.URL url = rowset.getURL(1);
043 * </pre>
044 */
045 public class SerialDatalink implements Serializable, Cloneable {
046
047 /**
048 * The extracted URL field retrieved from the DATALINK field.
049 * @serial
050 */
051 private URL url;
052
053 /**
054 * The SQL type of the elements in this <code>SerialDatalink</code>
055 * object. The type is expressed as one of the contants from the
056 * class <code>java.sql.Types</code>.
057 * @serial
058 */
059 private int baseType;
060
061 /**
062 * The type name used by the DBMS for the elements in the SQL
063 * <code>DATALINK</code> value that this SerialDatalink object
064 * represents.
065 * @serial
066 */
067 private String baseTypeName;
068
069 /**
070 * Constructs a new <code>SerialDatalink</code> object from the given
071 * <code>java.net.URL</code> object.
072 * <P>
073 * @throws SerialException if url parameter is a null
074 */
075 public SerialDatalink(URL url) throws SerialException {
076 if (url == null) {
077 throw new SerialException(
078 "Cannot serialize empty URL instance");
079 }
080 this .url = url;
081 }
082
083 /**
084 * Returns a new URL that is a copy of this <code>SerialDatalink</code>
085 * object.
086 *
087 * @return a copy of this <code>SerialDatalink</code> object as a
088 * <code>URL</code> object in the Java programming language.
089 * @throws SerialException if the <code>URL</code> object cannot be de-serialized
090 */
091 public URL getDatalink() throws SerialException {
092
093 URL aURL = null;
094
095 try {
096 aURL = new URL((this .url).toString());
097 } catch (java.net.MalformedURLException e) {
098 throw new SerialException("MalformedURLException: "
099 + e.getMessage());
100 }
101 return aURL;
102 }
103
104 /**
105 * The identifier that assists in the serialization of this <code>SerialDatalink</code>
106 * object.
107 */
108 static final long serialVersionUID = 2826907821828733626L;
109 }
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