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/* 
 * $Header: /home/cvs/jakarta-commons/dbutils/src/java/org/apache/commons/dbutils/wrappers/StringTrimmedResultSet.java,v 1.1 2003/11/02 19:15:23 dgraham Exp $
 * $Revision: 1.1 $
 * $Date: 2003/11/02 19:15:23 $
 * 
 * ====================================================================
 * 
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 */

package org.apache.commons.dbutils.wrappers;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.sql.ResultSet;

import org.apache.commons.dbutils.ProxyFactory;

/**
 * Wraps a ResultSet to trim strings returned by the
 * getString() and getObject() methods.
 * 
 * 

* Usage Example: * This example shows how to decorate ResultSets so processing continues as * normal but all Strings are trimmed before being returned from the * ResultSet. *

* *
 * 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 = BasicRowProcessor.instance().toBeanList(rs);
 * 
* * @author Steven Caswell * @author David Graham * @version $Id: StringTrimmedResultSet.java,v 1.1 2003/11/02 19:15:23 dgraham Exp $ */ public class StringTrimmedResultSet implements InvocationHandler { /** * The factory to create proxies with. */ private static final ProxyFactory factory = ProxyFactory.instance(); /** * Wraps the ResultSet in an instance of this class. This is * equivalent to: *
     * ProxyFactory.instance().createResultSet(new StringTrimmedResultSet(rs));
     * 
* * @param rs The ResultSet to wrap. */ public static ResultSet wrap(ResultSet rs) { return factory.createResultSet(new StringTrimmedResultSet(rs)); } /** * The wrapped result. */ private final ResultSet rs; /** * Constructs a new instance of StringTrimmedResultSet * to wrap the specified ResultSet. */ public StringTrimmedResultSet(ResultSet rs) { super(); this.rs = rs; } /** * Intercept calls to the getString() and * getObject() 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; } }
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