Re: Getting an object from a Hashtable
The Struts 1.0 ActionServlet and custom tags were written to rely on the
pre-Commons BeanUtils, which did not support maps. I don't believe
anything along these lines is going to be available to a Struts 1.0
application. You'd have to replace the ActionServlet too, at which point
it really wouldn't be a Struts 1.0 application anymore, and you could
just as well go up to 1.1b.
In 1.1, when bare Maps are being used in an application, an Action can
be used to wrap it in a bean. It does not need to be a DynaBean, it just
needs to have a public accessor and mutator, per the JavaBean
conventions. The Commons BeanUtil's package will handle the rest.
-- Ted Husted, Husted dot Com, Fairport NY US
-- Developing Java Web Applications with Struts
-- Tel: +1 585 737-3463
-- Web: http://husted.com/about/services
Adolfo Miguelez wrote:
Hhhmmm,
yes, in that way, we can get a value in a map which in turn is wrapped as a
bean property, but what about if my bean is a map itself.
(NOTE: We know about the different concept among a JavaBean spec class and a
java.util.Map).
Is there any way for that situation?
I have been inspecting BeanUtils package from Jakarta Commons, and it seens
to inspect any kind of property within a bean, mapped, indexed, simple,
nested, composed, but I can not find a way to inspect a map directly.
The reason to use a map rather than a bean is that, in that way, we can have
a general value object and not a specific bean for each JSP.
AFAIK we can solve the problem by replacing the map by a dynabean as value
object, but we have some application already working in production made with
Struts 1.0, when not dynabeans were available, and we needed to work out our
own tags to patch this situation.
I have suspicions that experts rejects using maps as value objects. However
I think that more for a traditional reason that for another one. I have seen
at EJB design patterns by Floyd Marinescu, page 59, a pattern using hashmaps
as data transfer objects. Could this transfer by understood as transfer
to JSP? I would grateful any light.
Any solution to this issue? Thanks in advance.
Adolfo.
From: Ted Husted [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: Struts Users Mailing List [EMAIL PROTECTED]
Subject: Re: Getting an object from a Hashtable
Date: Fri, 24 May 2002 08:45:51 -0400
Under Struts 1.1b, you could probably use the same approach that is used
to store ActionForm properties in a map.
private Map values = null;
public void setValues(Map values) {
this.values = values;
}
public Map getValues() {
return this.values;
}
public void setValue(String key, Object value) {
getValues().put(key,value);
}
public Object getValue(String key) {
return getValues().get(key);
}
logic:equal name=myBean property=value(valid) value=false
Do something here.
/logic:equal
Struts Newsgroup (@Basebeans.com) wrote:
Subject: Getting an object from a Hashtable
From: Scott Curtis [EMAIL PROTECTED]
===
Hi,
I want to be able to check the value of a property held within a
hashtable
using a Struts tag such as logic:equal /. For example I have a
Hashtable
which contains a collection of JavaBeans. In the JSP I know the key for
each
object in the Hashtable. I want to be able to select an object from the
Hashtable according to a specified key and then compare a property value
in
the returned object using it's getter.
Something along these lines:
MyBean contains a Hashtable called myHash full of JavaBean conformant
objects. MyBean has a getter to return the Hashtable getMyHash(). Each
of
the objects in the Hashtable is of type AnotherBean and they all have
getters and setters. I want to get an object from the Hashtable using
the
key obj1. The bean returned using obj1 has a 'valid' property with a
getter isValid().
This is what I want to do but it doesn't work obviously because
Hashtable
isn't a bean that can be queried from property getters and setters:
logic:equal name=MyBean property=myHash.obj1.valid value=false
Do something here.
/logic:equal
Is there another tag I can use to first get the AnotherBean from myHash
in
order for it to be used in the tag above? So basically me question is
really
simply how can I get an object from a Hashtable using Struts tags or any
other tags out there? I don't want to iterate the Hashtable by the way.
Thanks, if anyone understands that and can help. :-)
- scott
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-- Ted Husted, Husted dot Com, Fairport NY US
-- Developing Java Web Applications with Struts
-- Tel: +1 585 737-3463
-- Web: http://husted.com/about/services
--
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Re: Getting an object from a Hashtable
Hhhmmm,
yes, in that way, we can get a value in a map which in turn is wrapped as a
bean property, but what about if my bean is a map itself.
(NOTE: We know about the different concept among a JavaBean spec class and a
java.util.Map).
Is there any way for that situation?
I have been inspecting BeanUtils package from Jakarta Commons, and it seens
to inspect any kind of property within a bean, mapped, indexed, simple,
nested, composed, but I can not find a way to inspect a map directly.
The reason to use a map rather than a bean is that, in that way, we can have
a general value object and not a specific bean for each JSP.
AFAIK we can solve the problem by replacing the map by a dynabean as value
object, but we have some application already working in production made with
Struts 1.0, when not dynabeans were available, and we needed to work out our
own tags to patch this situation.
I have suspicions that experts rejects using maps as value objects. However
I think that more for a traditional reason that for another one. I have seen
at EJB design patterns by Floyd Marinescu, page 59, a pattern using hashmaps
as data transfer objects. Could this transfer by understood as transfer
to JSP? I would grateful any light.
Any solution to this issue? Thanks in advance.
Adolfo.
From: Ted Husted [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: Struts Users Mailing List [EMAIL PROTECTED]
Subject: Re: Getting an object from a Hashtable
Date: Fri, 24 May 2002 08:45:51 -0400
Under Struts 1.1b, you could probably use the same approach that is used
to store ActionForm properties in a map.
private Map values = null;
public void setValues(Map values) {
this.values = values;
}
public Map getValues() {
return this.values;
}
public void setValue(String key, Object value) {
getValues().put(key,value);
}
public Object getValue(String key) {
return getValues().get(key);
}
logic:equal name=myBean property=value(valid) value=false
Do something here.
/logic:equal
Struts Newsgroup (@Basebeans.com) wrote:
Subject: Getting an object from a Hashtable
From: Scott Curtis [EMAIL PROTECTED]
===
Hi,
I want to be able to check the value of a property held within a
hashtable
using a Struts tag such as logic:equal /. For example I have a
Hashtable
which contains a collection of JavaBeans. In the JSP I know the key for
each
object in the Hashtable. I want to be able to select an object from the
Hashtable according to a specified key and then compare a property value
in
the returned object using it's getter.
Something along these lines:
MyBean contains a Hashtable called myHash full of JavaBean conformant
objects. MyBean has a getter to return the Hashtable getMyHash(). Each
of
the objects in the Hashtable is of type AnotherBean and they all have
getters and setters. I want to get an object from the Hashtable using
the
key obj1. The bean returned using obj1 has a 'valid' property with a
getter isValid().
This is what I want to do but it doesn't work obviously because
Hashtable
isn't a bean that can be queried from property getters and setters:
logic:equal name=MyBean property=myHash.obj1.valid value=false
Do something here.
/logic:equal
Is there another tag I can use to first get the AnotherBean from myHash
in
order for it to be used in the tag above? So basically me question is
really
simply how can I get an object from a Hashtable using Struts tags or any
other tags out there? I don't want to iterate the Hashtable by the way.
Thanks, if anyone understands that and can help. :-)
- scott
--
To unsubscribe, e-mail:
mailto:[EMAIL PROTECTED]
For additional commands, e-mail:
mailto:[EMAIL PROTECTED]
-- Ted Husted, Husted dot Com, Fairport NY US
-- Developing Java Web Applications with Struts
-- Tel: +1 585 737-3463
-- Web: http://husted.com/about/services
--
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Getting an object from a Hashtable
Subject: Getting an object from a Hashtable From: Scott Curtis [EMAIL PROTECTED] === Hi, I want to be able to check the value of a property held within a hashtable using a Struts tag such as logic:equal /. For example I have a Hashtable which contains a collection of JavaBeans. In the JSP I know the key for each object in the Hashtable. I want to be able to select an object from the Hashtable according to a specified key and then compare a property value in the returned object using it's getter. Something along these lines: MyBean contains a Hashtable called myHash full of JavaBean conformant objects. MyBean has a getter to return the Hashtable getMyHash(). Each of the objects in the Hashtable is of type AnotherBean and they all have getters and setters. I want to get an object from the Hashtable using the key obj1. The bean returned using obj1 has a 'valid' property with a getter isValid(). This is what I want to do but it doesn't work obviously because Hashtable isn't a bean that can be queried from property getters and setters: logic:equal name=MyBean property=myHash.obj1.valid value=false Do something here. /logic:equal Is there another tag I can use to first get the AnotherBean from myHash in order for it to be used in the tag above? So basically me question is really simply how can I get an object from a Hashtable using Struts tags or any other tags out there? I don't want to iterate the Hashtable by the way. Thanks, if anyone understands that and can help. :-) - scott -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Getting an object from a Hashtable
Under Struts 1.1b, you could probably use the same approach that is used
to store ActionForm properties in a map.
private Map values = null;
public void setValues(Map values) {
this.values = values;
}
public Map getValues() {
return this.values;
}
public void setValue(String key, Object value) {
getValues().put(key,value);
}
public Object getValue(String key) {
return getValues().get(key);
}
logic:equal name=myBean property=value(valid) value=false
Do something here.
/logic:equal
Struts Newsgroup (@Basebeans.com) wrote:
Subject: Getting an object from a Hashtable
From: Scott Curtis [EMAIL PROTECTED]
===
Hi,
I want to be able to check the value of a property held within a hashtable
using a Struts tag such as logic:equal /. For example I have a Hashtable
which contains a collection of JavaBeans. In the JSP I know the key for each
object in the Hashtable. I want to be able to select an object from the
Hashtable according to a specified key and then compare a property value in
the returned object using it's getter.
Something along these lines:
MyBean contains a Hashtable called myHash full of JavaBean conformant
objects. MyBean has a getter to return the Hashtable getMyHash(). Each of
the objects in the Hashtable is of type AnotherBean and they all have
getters and setters. I want to get an object from the Hashtable using the
key obj1. The bean returned using obj1 has a 'valid' property with a
getter isValid().
This is what I want to do but it doesn't work obviously because Hashtable
isn't a bean that can be queried from property getters and setters:
logic:equal name=MyBean property=myHash.obj1.valid value=false
Do something here.
/logic:equal
Is there another tag I can use to first get the AnotherBean from myHash in
order for it to be used in the tag above? So basically me question is really
simply how can I get an object from a Hashtable using Struts tags or any
other tags out there? I don't want to iterate the Hashtable by the way.
Thanks, if anyone understands that and can help. :-)
- scott
--
To unsubscribe, e-mail: mailto:[EMAIL PROTECTED]
For additional commands, e-mail: mailto:[EMAIL PROTECTED]
-- Ted Husted, Husted dot Com, Fairport NY US
-- Developing Java Web Applications with Struts
-- Tel: +1 585 737-3463
-- Web: http://husted.com/about/services
--
To unsubscribe, e-mail: mailto:[EMAIL PROTECTED]
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