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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.sql.ResultSet;
/**
* 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>.
* </p>
*
* <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 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;
}
}
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