/*
* 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.
*/
package org.apache.empire.struts2.actionsupport;
import java.util.ArrayList;
import java.util.List;
import org.apache.empire.db.DBCommand;
import org.apache.empire.db.DBReader;
/**
* BeanListActionSupport
* <p>
* This class provides functions for handling list output from a database query through an list of JavaBeans.
* </p>
* @author Rainer
*/
public class BeanListActionSupport<T> extends ListActionSupport
{
protected ArrayList<T> list = null;
protected Class<T> beanClass;
public BeanListActionSupport(ActionBase action, Class<T> beanClass, String propertyName)
{
super(action, propertyName);
// Set Bean Class
this.beanClass = beanClass;
}
public ArrayList<T> getList()
{
if (list==null)
log.warn("Bean List has not been initialized!");
return list;
}
// SupplierReader
public boolean initBeanList(DBCommand cmd)
{
DBReader reader = new DBReader();
try {
// Open Suppier Reader
reader.open(cmd, action.getConnection());
// Move to desired Position
int first = this.getFirstItemIndex();
if (first>0 && !reader.skipRows(first))
{ // Page is not valid. Try again from beginning
reader.close();
setFirstItem(0);
initBeanList(cmd);
}
// Read List
list = reader.getBeanList(beanClass, getPageSize());
return true;
} catch(Exception e ) {
action.setActionError(e);
return false;
} finally {
reader.close();
}
}
public void setList(List<T> list)
{
this.list = new ArrayList<T>(list);
}
}