/**
* 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;
}
}
/**
* 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));
}