Re: Using ArrayList instead of String[] properties

[Michael McGrady]

I would personally suggest that you rethink your design.   If you want an 
"advanced" user interface that does that, then I would use a ListHandler 
implementation of a ListIterator interface that is so popular with the J2EE 
pattern people.  The ListIterator interface is something like the following:

package com.michaelmcgrady.util.list;

import java.util.Collection;
import java.util.List;
import com.michaelmcgrady.exception.ChainedException;

public interface ListIterator {
  public void       setList(List list) throws ChainedException;
  public Collection getList();
  public int        getSize() throws ChainedException;
  public void       setIndex(int index) throws ChainedException;
  public int        getCurrentIndex() throws ChainedException;
  public Object     getCurrentElement() throws ChainedException;
  public List       getPreviousElements(int count) throws ChainedException;
  public List       getPreviousElements() throws ChainedException;
  public List       getNextElements(int count) throws ChainedException;
  public List       getNextElements() throws ChainedException;
  public void       resetIndex() throws ChainedException;
} /// ;-)
This is what I use and it is lightening fast and works the way the design 
was promised to work.   You can work out what you do with the newer "c" el 
stuff, but I have done it the following way in code I have not changed:

                          <nested:define id='list_handler' 
type='com.michaelmcgrady.user.ListHandler' scope='session'/>
                          <nested:root name='list_handler'>
                            <logic:iterate id='users' name='list_handler' 
property='list'>
                            <hr color='<bean:write name="gui_data" 
property="view.lgnDrkClr" />'>
                              id:       &nbsp;<bean:write name='users' 
property='id'/>        <br>
                              username  &nbsp;<bean:write name='users' 
property='username'/>  <br>
                              password  &nbsp;<bean:write name='users' 
property='password'/>  <br>
                              name      &nbsp;<bean:write name='users' 
property='name'/>      <br>
                              email     &nbsp;<bean:write name='users' 
property='email'/>     <br>
                              type      &nbsp;<bean:write name='users' 
property='type'/>      <br>
                              status    &nbsp;<bean:write name='users' 
property='status'/>    <br>
                              time      &nbsp;<bean:write name='users' 
property='time'/>      <br>
                            </logic:iterate>
                          </nested:root>

Hope this helps.  Don't know anything about dynamically uploading applets, 
do you?  I cannot seem to get that right.

Regards,

Michael McGrady
At 01:46 PM 1/9/2004, you wrote:
I have a String[] property in a DynaValidatorForm.  It works fine with
multiple checkboxes and accepts multiple selections.
Now I need to do an "advanced" user interface, where the user can enter
the information in text boxes and click 'Add'.  Behind the scenes I need
to populate that String[] property (which is named 'accounts').
I don't want to deal with checking the size of the array and the
inevitable out of bounds exceptions, so I thought ArrayList would be a
better choice.  However, when I change to ArrayList, including
struts-config.xml:
  <form-property     name="accounts"      type="java.util.ArrayList"/>

BeanUtils complains when I submit the form that has the multiple
checkboxes:
  org.apache.commons.beanutils.ConversionException: Cannot assign value
of type
  'java.lang.String' to property 'accounts' of type
'java.util.ArrayList'
The docs indicate that ArrayList is allowed in DynaActionForms (mine is
a DynaValidatorForm):
http://jakarta.apache.org/struts/userGuide/building_controller.html#dyna
_action_form_classes
The multibox tag is:
<c:forEach items="${accountMap[accountForm.map.calendarYear]}"
var="account" >
    <html-el:multibox property="accounts">
       <c:out value="${account.key}"/>
    </html-el:multibox>
    <c:out value="${account.key}"/>&nbsp;
    <c:out value="${account.costCenterDesc}"/>
    <br/>
  </c:forEach>
Which correctly renders checkboxes such as
<input type="checkbox" name="accounts"
value="55_U_ABCD1234">55_U_ABCD1234&nbsp;Some Account<br/>
<input type="checkbox" name="accounts"
value="66_S_EFGH5678">66_S_EFGH5678&nbsp;Some Other Account<br/>
Any idea what I'm doing wrong, or is there a better way to do this?

--
Wendy Smoak
Application Systems Analyst, Sr.
ASU IA Information Resources Management




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