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17 package org.apache.commons.dbutils.handlers;
18
19 import java.sql.ResultSet;
20 import java.sql.SQLException;
21
22 import org.apache.commons.dbutils.ResultSetHandler;
23 import org.apache.commons.dbutils.RowProcessor;
24
25 /**
26 * <code>ResultSetHandler</code> implementation that converts the first
27 * <code>ResultSet</code> row into a JavaBean. This class is thread safe.
28 *
29 * @see org.apache.commons.dbutils.ResultSetHandler
30 */
31 public class BeanHandler implements ResultSetHandler {
32
33 /**
34 * The Class of beans produced by this handler.
35 */
36 private Class type = null;
37
38 /**
39 * The RowProcessor implementation to use when converting rows
40 * into beans.
41 */
42 private RowProcessor convert = ArrayHandler.ROW_PROCESSOR;
43
44 /**
45 * Creates a new instance of BeanHandler.
46 *
47 * @param type The Class that objects returned from <code>handle()</code>
48 * are created from.
49 */
50 public BeanHandler(Class type) {
51 this.type = type;
52 }
53
54 /**
55 * Creates a new instance of BeanHandler.
56 *
57 * @param type The Class that objects returned from <code>handle()</code>
58 * are created from.
59 * @param convert The <code>RowProcessor</code> implementation
60 * to use when converting rows into beans.
61 */
62 public BeanHandler(Class type, RowProcessor convert) {
63 this.type = type;
64 this.convert = convert;
65 }
66
67 /**
68 * Convert the first row of the <code>ResultSet</code> into a bean with the
69 * <code>Class</code> given in the constructor.
70 *
71 * @return An initialized JavaBean or <code>null</code> if there were no
72 * rows in the <code>ResultSet</code>.
73 *
74 * @throws SQLException if a database access error occurs
75 * @see org.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet)
76 */
77 public Object handle(ResultSet rs) throws SQLException {
78 return rs.next() ? this.convert.toBean(rs, this.type) : null;
79 }
80
81 }