Re: [jruby-user] Using a text record from the database as a Java String?

Below is a JRuby irb session that proves Ariel's point.  A Ruby string is
passed to the constructor of java.util.Locale, a Java method requiring a
Java string.  The object is successfully created, proving that the Ruby
string was converted to a Java string when calling the Java method:

jruby-1.7.15 :001 > import java.util.Locale
 => [Java::JavaUtil::Locale]
jruby-1.7.15 :002 > s = 'en_US'
 => "en_US"
jruby-1.7.15 :003 > s.class
 => String
jruby-1.7.15 :004 > locale = java.util.Locale.new(s)
 => #<Java::JavaUtil::Locale:0x5a670b0b>

- Keith



On Thu, Oct 23, 2014 at 9:27 AM, Ariel Valentin <[email protected]>
wrote:

> Its been quite some time since I have used Rails so I am not 100% certain
> but I thought ActiveRecord simply treated the DB text data type as if it
> were a string in memory and everything should just "work".  According to
> https://github.com/jruby/jruby/wiki/CallingJavaFromJRuby:
>
> "When calling Java from JRuby, primitive Ruby types are converted to
> default boxed Java types:
> Ruby TypeJava Type*"foo"**java.lang.String**1**java.lang.Long**1.0*
> *java.lang.Double**true, false**java.lang.Boolean**1*
> *java.math.BigInteger*
>
> If you are running into a problem there is always "to_java" but JRuby
> should already be converting the object on your behalf:
>
> =====
> irb(main):001:0> s = "ruby string"
>
> => "ruby string"
>
> irb(main):002:0> j = s.to_java
>
> => #<Java::JavaLang::String:0x79cda784>
>
> irb(main):006:0> j.last_index_of('r')
>
> => 7
>
>
> HTH,
> Ariel
>
> Ariel Valentin
> e-mail: [email protected]
> website: http://blog.arielvalentin.com
> skype: ariel.s.valentin
> twitter: arielvalentin
> linkedin: http://www.linkedin.com/profile/view?id=8996534
> ---------------------------------------
> *simplicity *communication
> *feedback *courage *respect
>
> On Wed, Oct 22, 2014 at 9:27 PM, David Maxwell <[email protected]>
> wrote:
>
>> I'm building a rails app where the user input is submitted to the
>> database via a text field, with :text datatype. I want to take this text
>> data and use java to analyse and interact with it, but to do this it
>> obviously needs to be a String datatype. Is there an easy way to cast
>> the text data to a String so that I can manipulate it using Java? Thanks
>> :)
>>
>> --
>> Posted via http://www.ruby-forum.com/.
>>
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>