コード例 #1
0
/**
 * Wraps a <code>ResultSet</code> to trim strings returned by the <code>getString()</code> and
 * <code>getObject()</code> methods.
 *
 * <p>Usage Example: This example shows how to decorate ResultSets so processing continues as normal
 * but all Strings are trimmed before being returned from the <code>ResultSet</code>.
 *
 * <pre>
 * ResultSet rs = // somehow get a ResultSet;
 *
 * // Substitute wrapped ResultSet with additional behavior for real ResultSet
 * rs = StringTrimmedResultSet.wrap(rs);
 *
 * // Pass wrapped ResultSet to processor
 * List list = new BasicRowProcessor().toBeanList(rs);
 * </pre>
 */
public class StringTrimmedResultSet implements InvocationHandler {

  /** The factory to create proxies with. */
  private static final ProxyFactory factory = ProxyFactory.instance();

  /**
   * Wraps the <code>ResultSet</code> in an instance of this class. This is equivalent to:
   *
   * <pre>
   * ProxyFactory.instance().createResultSet(new StringTrimmedResultSet(rs));
   * </pre>
   *
   * @param rs The <code>ResultSet</code> to wrap.
   * @return wrapped ResultSet
   */
  public static ResultSet wrap(ResultSet rs) {
    return factory.createResultSet(new StringTrimmedResultSet(rs));
  }

  /** The wrapped result. */
  private final ResultSet rs;

  /**
   * Constructs a new instance of <code>StringTrimmedResultSet</code> to wrap the specified <code>
   * ResultSet</code>.
   *
   * @param rs ResultSet to wrap
   */
  public StringTrimmedResultSet(ResultSet rs) {
    super();
    this.rs = rs;
  }

  /**
   * Intercept calls to the <code>getString()</code> and <code>getObject()</code> methods and trim
   * any Strings before they're returned.
   *
   * @throws Throwable
   * @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object, java.lang.reflect.Method,
   *     java.lang.Object[])
   */
  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

    Object result = method.invoke(this.rs, args);

    if (method.getName().equals("getObject") || method.getName().equals("getString")) {

      if (result instanceof String) {
        result = ((String) result).trim();
      }
    }

    return result;
  }
}
コード例 #2
0
 /**
  * Wraps the <code>ResultSet</code> in an instance of this class. This is equivalent to:
  *
  * <pre>
  * ProxyFactory.instance().createResultSet(new StringTrimmedResultSet(rs));
  * </pre>
  *
  * @param rs The <code>ResultSet</code> to wrap.
  * @return wrapped ResultSet
  */
 public static ResultSet wrap(ResultSet rs) {
   return factory.createResultSet(new StringTrimmedResultSet(rs));
 }