Re: Custom describe() for use with BeanUtil.populate()

[Duke Ronlund]

Hi, 

Look to the comomns/beanutils source, either download it from the
commons project or from the cvs
http://cvs.apache.org/viewcvs.cgi/jakarta-commons/beanutils/src/java/org/apache/commons/beanutils/BeanUtils.java

I have done this in the past by just customising the populate/describe
methods to suit your my purposes.


Duke


On Tue, 2002-05-21 at 04:32, DHS Struts wrote:
> I was wondering if anyone had a custom describe method they would be willing 
> to share as an example of what Ted Husted describes in his "Struts Catalog" 
> in the 'Use a "populate" utility to exchange data with value objects' 
> section?
> 
> I understand the basic concept of needing to write my own describe() for 
> those beans that have Date attributes (because the BeanUtil.populate() can't 
> handle them), but I am not having much luck getting it to work.
> 
> If you have some code and are willing to share I would appreciate it. Also, 
> if you would like to see what I have attempted I can post that here as well.
> 
> Thank you in advance,
> 
> mark n.
> 
> _
> Chat with friends online, try MSN Messenger: http://messenger.msn.com
> 
> 
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Re: Custom describe() for use with BeanUtil.populate()

[DHS Struts]

Thank you Will, this is very cool. Much better than littering my form beans 
with desribe methods.

mark n.


>From: Will Jaynes <[EMAIL PROTECTED]>
>Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Re: Custom describe() for use with BeanUtil.populate()
>Date: Tue, 21 May 2002 07:12:46 -0400
>
>You don't need your own describe method anymore. BeanUtils has added the
>capability to register conversion methods, to go from String to any
>arbitrary object. So for example, I have a MSCalendar object whose
>toString puts out mm/dd/ format, and can take that same format in a
>constructor.
>
>The MSConverter (attached) is mostly copied from one of Craig's
>converters in the Commons BeanUtils package.
>
>public void testStuff()
> {
> Map map = null;
> int i;
>
> // Register converters that enable conversion of String properties
> // to a designated class. String->MSCalendar
> ConvertUtils.register(new MSCalendarConverter(),
>   MSCalendar.class);
>
> EmployeeBean emp = new EmployeeBean();
> emp.setFirstName("Joe");
> emp.setLastName("Klein");
> emp.setBirthDate(new MSCalendar("1/1/1999"));
>
> EmployeeFormBean form = new EmployeeFormBean();
> try {
>
> // Copy all properties of an EmployeeBean to the corresponding
> // properties of an EmployeeFormBean.
> // This process uses the toString() method of each
> // property in EmployeeBean as the value to put into
> // the corresponding String property in the form.
> map = BeanUtils.describe(emp);
> BeanUtils.populate(form, map);
>
> // Conversely, copy all the properties from the form into
> // the corresponding properties of EmployeeBean, converting
> // from String to the taget object type.
> emp = new EmployeeBean();
> map = BeanUtils.describe(form);
> BeanUtils.populate(emp, map);
>
>  } catch(Exception ex) {
> fail("failure:"+ex.getStackTrace());
> }
> }
>}
>
>DHS Struts wrote:
>>I was wondering if anyone had a custom describe method they would be
>>willing to share as an example of what Ted Husted describes in his
>>"Struts Catalog" in the 'Use a "populate" utility to exchange data with
>>value objects' section?
>>
>>I understand the basic concept of needing to write my own describe() for
>>those beans that have Date attributes (because the BeanUtil.populate()
>>can't handle them), but I am not having much luck getting it to work.
>>
>>If you have some code and are willing to share I would appreciate it.
>>Also, if you would like to see what I have attempted I can post that
>>here as well.
>>
>>Thank you in advance,
>>
>>mark n.
>>
>>_
>>Chat with friends online, try MSN Messenger: http://messenger.msn.com
>>
>>
>>--
>>To unsubscribe, e-mail:
>><mailto:[EMAIL PROTECTED]>
>>For additional commands, e-mail:
>><mailto:[EMAIL PROTECTED]>
>>
>
>
>package edu.umich.umms.beanutils;
>import java.sql.Date;
>import org.apache.commons.beanutils.ConversionException;
>import org.apache.commons.beanutils.Converter;
>
>
>/**
>  * Standard {@link Converter} implementation that converts an incoming
>  * String into a edu.umich.umms.util.MSCalendar object, 
>optionally using a
>  * default value or throwing a {@link ConversionException} if a conversion
>  * error occurs.
>  *
>  */
>
>public final class MSCalendarConverter implements Converter {
>
>
> // --- 
>Constructors
>
>
> /**
>  * Create a {@link Converter} that will throw a {@link 
>ConversionException}
>  * if a conversion error occurs.
>  */
> public MSCalendarConverter() {
>
> this(null);
>
> }
>
>
> /**
>  * Create a {@link Converter} that will return the specified default 
>value
>  * if a conversion error occurs.
>  *
>  * @param defaultValue The default value to be returned
>  */
> public MSCalendarConverter(Object defaultValue) {
>
> this.defaultValue = defaultValue;
>
> }
>
>
> // - Instance 
>Variables
>
>
> /**
>  * The default value specified to our Constructor

Re: Custom describe() for use with BeanUtil.populate()

[Will Jaynes]

You don't need your own describe method anymore. BeanUtils has added the 
capability to register conversion methods, to go from String to any 
arbitrary object. So for example, I have a MSCalendar object whose 
toString puts out mm/dd/ format, and can take that same format in a 
constructor.

The MSConverter (attached) is mostly copied from one of Craig's 
converters in the Commons BeanUtils package.

public void testStuff()
 {
 Map map = null;
 int i;

 // Register converters that enable conversion of String properties
 // to a designated class. String->MSCalendar
 ConvertUtils.register(new MSCalendarConverter(),
   MSCalendar.class);

 EmployeeBean emp = new EmployeeBean();
 emp.setFirstName("Joe");
 emp.setLastName("Klein");
 emp.setBirthDate(new MSCalendar("1/1/1999"));

 EmployeeFormBean form = new EmployeeFormBean();
 try {

 // Copy all properties of an EmployeeBean to the corresponding
 // properties of an EmployeeFormBean.
 // This process uses the toString() method of each
 // property in EmployeeBean as the value to put into
 // the corresponding String property in the form.
 map = BeanUtils.describe(emp);
 BeanUtils.populate(form, map);

 // Conversely, copy all the properties from the form into
 // the corresponding properties of EmployeeBean, converting
 // from String to the taget object type.
 emp = new EmployeeBean();
 map = BeanUtils.describe(form);
 BeanUtils.populate(emp, map);

  } catch(Exception ex) {
 fail("failure:"+ex.getStackTrace());
 }
 }
}

DHS Struts wrote:
> I was wondering if anyone had a custom describe method they would be 
> willing to share as an example of what Ted Husted describes in his 
> "Struts Catalog" in the 'Use a "populate" utility to exchange data with 
> value objects' section?
> 
> I understand the basic concept of needing to write my own describe() for 
> those beans that have Date attributes (because the BeanUtil.populate() 
> can't handle them), but I am not having much luck getting it to work.
> 
> If you have some code and are willing to share I would appreciate it. 
> Also, if you would like to see what I have attempted I can post that 
> here as well.
> 
> Thank you in advance,
> 
> mark n.
> 
> _
> Chat with friends online, try MSN Messenger: http://messenger.msn.com
> 
> 
> -- 
> To unsubscribe, e-mail:   
> 
> For additional commands, e-mail: 
> 
> 




package edu.umich.umms.beanutils;
import java.sql.Date;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.Converter;


/**
 * Standard {@link Converter} implementation that converts an incoming
 * String into a edu.umich.umms.util.MSCalendar object, optionally using a
 * default value or throwing a {@link ConversionException} if a conversion
 * error occurs.
 *
 */

public final class MSCalendarConverter implements Converter {


// --- Constructors


/**
 * Create a {@link Converter} that will throw a {@link ConversionException}
 * if a conversion error occurs.
 */
public MSCalendarConverter() {

this(null);

}


/**
 * Create a {@link Converter} that will return the specified default value
 * if a conversion error occurs.
 *
 * @param defaultValue The default value to be returned
 */
public MSCalendarConverter(Object defaultValue) {

this.defaultValue = defaultValue;

}


// - Instance Variables


/**
 * The default value specified to our Constructor, if any.
 */
private Object defaultValue = null;


// - Public Methods


/**
 * Convert the specified input object into an output object of the
 * specified type.
 *
 * @param type Data type to which this value should be converted
 * @param value The input value to be converted
 *
 * @exception ConversionException if conversion cannot be performed
 *  successfully
 */
public Object convert(Class type, Object value) {

if (value == null) {
if (defaultValue != null) {
return (defaultValue);
} else {
throw new ConversionException("No value specified");
}
}

try {
return new edu.umich.umms.util.MSCalendar((String) value);
//return (Date.valueOf((String) value));
} catch (Exception e) {
if (defaultValue != null) {
return (defaultValue);
} else {
throw new ConversionException(e)

Re: Custom describe() for use with BeanUtil.populate()

[Arron Bates]

BeanUtils/PropertyUtils simply got moved to commons, and is maintained 
there.
Same classes, new home.


Arron.

Adam Hardy wrote:

> But BeanUtils has been deprecated - in the Javadocs it says "/At some 
> point after Struts 1.0 final, will be replaced by an equivalent class 
> in the Jakarta Commons Beanutils package./"
>
> I don't know whether this is still true.
>
>
> Adam
>
> DHS Struts wrote:
>
>> I was wondering if anyone had a custom describe method they would be 
>> willing to share as an example of what Ted Husted describes in his 
>> "Struts Catalog" in the 'Use a "populate" utility to exchange data 
>> with value objects' section?
>>
>> I understand the basic concept of needing to write my own describe() 
>> for those beans that have Date attributes (because the 
>> BeanUtil.populate() can't handle them), but I am not having much luck 
>> getting it to work.
>>
>> If you have some code and are willing to share I would appreciate it. 
>> Also, if you would like to see what I have attempted I can post that 
>> here as well.
>>
>> Thank you in advance,
>>
>> mark n.
>>
>> _
>> Chat with friends online, try MSN Messenger: http://messenger.msn.com
>>
>>
>> -- 
>> To unsubscribe, e-mail: 
>> 
>> For additional commands, e-mail: 
>> 
>>
>>
>
>
>
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> 
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Re: Custom describe() for use with BeanUtil.populate()

[Adam Hardy]

But BeanUtils has been deprecated - in the Javadocs it says "/At some 
point after Struts 1.0 final, will be replaced by an equivalent class in 
the Jakarta Commons Beanutils package./"

I don't know whether this is still true.


Adam

DHS Struts wrote:

> I was wondering if anyone had a custom describe method they would be 
> willing to share as an example of what Ted Husted describes in his 
> "Struts Catalog" in the 'Use a "populate" utility to exchange data 
> with value objects' section?
>
> I understand the basic concept of needing to write my own describe() 
> for those beans that have Date attributes (because the 
> BeanUtil.populate() can't handle them), but I am not having much luck 
> getting it to work.
>
> If you have some code and are willing to share I would appreciate it. 
> Also, if you would like to see what I have attempted I can post that 
> here as well.
>
> Thank you in advance,
>
> mark n.
>
> _
> Chat with friends online, try MSN Messenger: http://messenger.msn.com
>
>
> -- 
> To unsubscribe, e-mail:   
> 
> For additional commands, e-mail: 
> 
>
>



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