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Posted to user@commons.apache.org by Adrian Gonzalez <ad...@yahoo.fr> on 2009/06/12 16:55:13 UTC
Re : Convert List to Map
Thanks
Your sample works fine for my use case (that's exactly what I'm doing in my code), but I was wondering about such utility thing just after looking at :
http://commons.apache.org/collections/api-release/org/apache/commons/collections/map/TransformedMap.html#decorate(java.util.Map,%20org.apache.commons.collections.Transformer,%20org.apache.commons.collections.Transformer)
which is a map-to-map conversions.
Since commons-collection provides map-to-map conversion, why does'nt it provide list-to-map conversion with the same logic ?
________________________________
De : Ted Dunning <te...@gmail.com>
À : Commons Users List <us...@commons.apache.org>
Envoyé le : Jeudi, 11 Juin 2009, 23h12mn 10s
Objet : Re: Convert List to Map
How is this easier than this:
Map m = new HashMap();
for (SpecificObject x : list) {
m.put(s.getId(), s.getDescription());
}
?
Why make this soo much harder than it needs to be?
On Wed, Jun 10, 2009 at 12:19 PM, Adrian Gonzalez <ad...@yahoo.fr>wrote:
> Hello,
>
> I have the same question as
> http://mail-archives.apache.org/mod_mbox/commons-user/200509.mbox/%3C878e7290050905002752ed543d@mail.gmail.com%3E:
>
> I need to do a lot of list-to-map conversions, and I'm looking for a way to
> use commons collections for this.
> I would like to do something like this:
>
> Map map = ListUtils.toMap(list, new SomeTransformerInterface() {
> void insertIntoMap(Object object, Map map) {
> SpecificObject s = (SpecificObject) object;
> map.put(s.getId(), s.getDescription());
> }
> });
>
> Is there a way to do that with commons collection ?
>
> Thank you very much
>
>
>
--
Ted Dunning, CTO
DeepDyve
111 West Evelyn Ave. Ste. 202
Sunnyvale, CA 94086
http://www.deepdyve.com
858-414-0013 (m)
408-773-0220 (fax)
Re: Re : Re : Convert List to Map
Posted by James Carman <ja...@carmanconsulting.com>.
I don't think so, but you're free to copy it if you wish. There's
really not much code there.
On Fri, Jun 12, 2009 at 5:56 PM, Adrian Gonzalez<ad...@yahoo.fr> wrote:
> That's exactly what I was talking about !
>
> Has it done its way to commons collection ? (I don't see it in 3.2.1 or in JIRA)
>
> Code extract from http://mail-archives.apache.org/mod_mbox/commons-dev/200709.mbox/<f2...@mail.gmail.com> :
>
> Map<K,V> CollectionUtils.toMap(Collection<C> input,
> Transformer<C,K> keyTransformer, Transformer<C,V>
> valueTransformer, Map<K,V> map)
> or
> Map<K,V> CollectionUtils.toMap(Collection<C> input,
> Transformer<C,K> keyTransformer, Transformer<C,V>
> valueTransformer)
>
>
>
>
>
>
>
> ________________________________
> De : James Carman <ja...@carmanconsulting.com>
> À : Commons Users List <us...@commons.apache.org>
> Envoyé le : Vendredi, 12 Juin 2009, 17h27mn 03s
> Objet : Re: Re : Convert List to Map
>
> We had a discussion of something like what you're asking for in the past:
>
> http://mail-archives.apache.org/mod_mbox/commons-dev/200709.mbox/<f2...@mail.gmail.com>
>
>
> On Fri, Jun 12, 2009 at 10:55 AM, Adrian Gonzalez<ad...@yahoo.fr> wrote:
>> Thanks
>>
>> Your sample works fine for my use case (that's exactly what I'm doing in my code), but I was wondering about such utility thing just after looking at :
>> http://commons.apache.org/collections/api-release/org/apache/commons/collections/map/TransformedMap.html#decorate(java.util.Map,%20org.apache.commons.collections.Transformer,%20org.apache.commons.collections.Transformer)
>> which is a map-to-map conversions.
>>
>> Since commons-collection provides map-to-map conversion, why does'nt it provide list-to-map conversion with the same logic ?
>>
>>
>>
>>
>>
>> ________________________________
>> De : Ted Dunning <te...@gmail.com>
>> À : Commons Users List <us...@commons.apache.org>
>> Envoyé le : Jeudi, 11 Juin 2009, 23h12mn 10s
>> Objet : Re: Convert List to Map
>>
>> How is this easier than this:
>>
>> Map m = new HashMap();
>> for (SpecificObject x : list) {
>> m.put(s.getId(), s.getDescription());
>> }
>>
>> ?
>>
>> Why make this soo much harder than it needs to be?
>>
>> On Wed, Jun 10, 2009 at 12:19 PM, Adrian Gonzalez <ad...@yahoo.fr>wrote:
>>
>>> Hello,
>>>
>>> I have the same question as
>>> http://mail-archives.apache.org/mod_mbox/commons-user/200509.mbox/%3C878e7290050905002752ed543d@mail.gmail.com%3E:
>>>
>>> I need to do a lot of list-to-map conversions, and I'm looking for a way to
>>> use commons collections for this.
>>> I would like to do something like this:
>>>
>>> Map map = ListUtils.toMap(list, new SomeTransformerInterface() {
>>> void insertIntoMap(Object object, Map map) {
>>> SpecificObject s = (SpecificObject) object;
>>> map.put(s.getId(), s.getDescription());
>>> }
>>> });
>>>
>>> Is there a way to do that with commons collection ?
>>>
>>> Thank you very much
>>>
>>>
>>>
>>
>>
>>
>>
>> --
>> Ted Dunning, CTO
>> DeepDyve
>>
>> 111 West Evelyn Ave. Ste. 202
>> Sunnyvale, CA 94086
>> http://www.deepdyve.com
>> 858-414-0013 (m)
>> 408-773-0220 (fax)
>>
>>
>>
>>
>
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Re : Re : Convert List to Map
Posted by Adrian Gonzalez <ad...@yahoo.fr>.
That's exactly what I was talking about !
Has it done its way to commons collection ? (I don't see it in 3.2.1 or in JIRA)
Code extract from http://mail-archives.apache.org/mod_mbox/commons-dev/200709.mbox/<f2...@mail.gmail.com> :
Map<K,V> CollectionUtils.toMap(Collection<C> input,
Transformer<C,K> keyTransformer, Transformer<C,V>
valueTransformer, Map<K,V> map)
or
Map<K,V> CollectionUtils.toMap(Collection<C> input,
Transformer<C,K> keyTransformer, Transformer<C,V>
valueTransformer)
________________________________
De : James Carman <ja...@carmanconsulting.com>
À : Commons Users List <us...@commons.apache.org>
Envoyé le : Vendredi, 12 Juin 2009, 17h27mn 03s
Objet : Re: Re : Convert List to Map
We had a discussion of something like what you're asking for in the past:
http://mail-archives.apache.org/mod_mbox/commons-dev/200709.mbox/<f2...@mail.gmail.com>
On Fri, Jun 12, 2009 at 10:55 AM, Adrian Gonzalez<ad...@yahoo.fr> wrote:
> Thanks
>
> Your sample works fine for my use case (that's exactly what I'm doing in my code), but I was wondering about such utility thing just after looking at :
> http://commons.apache.org/collections/api-release/org/apache/commons/collections/map/TransformedMap.html#decorate(java.util.Map,%20org.apache.commons.collections.Transformer,%20org.apache.commons.collections.Transformer)
> which is a map-to-map conversions.
>
> Since commons-collection provides map-to-map conversion, why does'nt it provide list-to-map conversion with the same logic ?
>
>
>
>
>
> ________________________________
> De : Ted Dunning <te...@gmail.com>
> À : Commons Users List <us...@commons.apache.org>
> Envoyé le : Jeudi, 11 Juin 2009, 23h12mn 10s
> Objet : Re: Convert List to Map
>
> How is this easier than this:
>
> Map m = new HashMap();
> for (SpecificObject x : list) {
> m.put(s.getId(), s.getDescription());
> }
>
> ?
>
> Why make this soo much harder than it needs to be?
>
> On Wed, Jun 10, 2009 at 12:19 PM, Adrian Gonzalez <ad...@yahoo.fr>wrote:
>
>> Hello,
>>
>> I have the same question as
>> http://mail-archives.apache.org/mod_mbox/commons-user/200509.mbox/%3C878e7290050905002752ed543d@mail.gmail.com%3E:
>>
>> I need to do a lot of list-to-map conversions, and I'm looking for a way to
>> use commons collections for this.
>> I would like to do something like this:
>>
>> Map map = ListUtils.toMap(list, new SomeTransformerInterface() {
>> void insertIntoMap(Object object, Map map) {
>> SpecificObject s = (SpecificObject) object;
>> map.put(s.getId(), s.getDescription());
>> }
>> });
>>
>> Is there a way to do that with commons collection ?
>>
>> Thank you very much
>>
>>
>>
>
>
>
>
> --
> Ted Dunning, CTO
> DeepDyve
>
> 111 West Evelyn Ave. Ste. 202
> Sunnyvale, CA 94086
> http://www.deepdyve.com
> 858-414-0013 (m)
> 408-773-0220 (fax)
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org
Re: Re : Convert List to Map
Posted by James Carman <ja...@carmanconsulting.com>.
We had a discussion of something like what you're asking for in the past:
http://mail-archives.apache.org/mod_mbox/commons-dev/200709.mbox/<f2...@mail.gmail.com>
On Fri, Jun 12, 2009 at 10:55 AM, Adrian Gonzalez<ad...@yahoo.fr> wrote:
> Thanks
>
> Your sample works fine for my use case (that's exactly what I'm doing in my code), but I was wondering about such utility thing just after looking at :
> http://commons.apache.org/collections/api-release/org/apache/commons/collections/map/TransformedMap.html#decorate(java.util.Map,%20org.apache.commons.collections.Transformer,%20org.apache.commons.collections.Transformer)
> which is a map-to-map conversions.
>
> Since commons-collection provides map-to-map conversion, why does'nt it provide list-to-map conversion with the same logic ?
>
>
>
>
>
> ________________________________
> De : Ted Dunning <te...@gmail.com>
> À : Commons Users List <us...@commons.apache.org>
> Envoyé le : Jeudi, 11 Juin 2009, 23h12mn 10s
> Objet : Re: Convert List to Map
>
> How is this easier than this:
>
> Map m = new HashMap();
> for (SpecificObject x : list) {
> m.put(s.getId(), s.getDescription());
> }
>
> ?
>
> Why make this soo much harder than it needs to be?
>
> On Wed, Jun 10, 2009 at 12:19 PM, Adrian Gonzalez <ad...@yahoo.fr>wrote:
>
>> Hello,
>>
>> I have the same question as
>> http://mail-archives.apache.org/mod_mbox/commons-user/200509.mbox/%3C878e7290050905002752ed543d@mail.gmail.com%3E:
>>
>> I need to do a lot of list-to-map conversions, and I'm looking for a way to
>> use commons collections for this.
>> I would like to do something like this:
>>
>> Map map = ListUtils.toMap(list, new SomeTransformerInterface() {
>> void insertIntoMap(Object object, Map map) {
>> SpecificObject s = (SpecificObject) object;
>> map.put(s.getId(), s.getDescription());
>> }
>> });
>>
>> Is there a way to do that with commons collection ?
>>
>> Thank you very much
>>
>>
>>
>
>
>
>
> --
> Ted Dunning, CTO
> DeepDyve
>
> 111 West Evelyn Ave. Ste. 202
> Sunnyvale, CA 94086
> http://www.deepdyve.com
> 858-414-0013 (m)
> 408-773-0220 (fax)
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@commons.apache.org
For additional commands, e-mail: user-help@commons.apache.org