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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.BasicRowProcessor;
23 import org.apache.commons.dbutils.ResultSetHandler;
24 import org.apache.commons.dbutils.RowProcessor;
25
26 /**
27 * <code>ResultSetHandler</code> implementation that converts a
28 * <code>ResultSet</code> into an <code>Object[]</code>. This class is
29 * thread safe.
30 *
31 * @see org.apache.commons.dbutils.ResultSetHandler
32 */
33 public class ArrayHandler implements ResultSetHandler {
34
35 /**
36 * Singleton processor instance that handlers share to save memory. Notice
37 * the default scoping to allow only classes in this package to use this
38 * instance.
39 */
40 static final RowProcessor ROW_PROCESSOR = new BasicRowProcessor();
41
42 /**
43 * The RowProcessor implementation to use when converting rows
44 * into arrays.
45 */
46 private RowProcessor convert = ROW_PROCESSOR;
47
48 /**
49 * Creates a new instance of ArrayHandler using a
50 * <code>BasicRowProcessor</code> for conversion.
51 */
52 public ArrayHandler() {
53 super();
54 }
55
56 /**
57 * Creates a new instance of ArrayHandler.
58 *
59 * @param convert The <code>RowProcessor</code> implementation
60 * to use when converting rows into arrays.
61 */
62 public ArrayHandler(RowProcessor convert) {
63 super();
64 this.convert = convert;
65 }
66
67 /**
68 * Places the column values from the first row in an <code>Object[]</code>.
69 *
70 * @return An Object[] or <code>null</code> if there are no rows in the
71 * <code>ResultSet</code>.
72 *
73 * @throws SQLException if a database access error occurs
74 * @see org.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet)
75 */
76 public Object handle(ResultSet rs) throws SQLException {
77 return rs.next() ? this.convert.toArray(rs) : null;
78 }
79
80 }