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[Dltk-dev] Calling Java from Ruby
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How can I call static Java methods located in a different project than
my Ruby script?
I have a Java project named ZooGlue containing the class
zoo.util.Truthiness, and a Ruby project named Zuby containing the script
TestTruthiness.rb starting with these lines:
include Java
include_class Java::zoo.utils.Truthiness
When I run TestTruthiness.rb, I get
C:/downloads/Ruby/jruby-1.1.4/lib/ruby/site_ruby/1.8/builtin/javasupport.rb:49:
in `method_missing': cannot load Java class zoo.utils.Truthiness
(NameError)
from C:\Workspace\Zuby\TestTruthiness.rb:9
I probably ought to put ZooGlue on Zuby's build path somehow, but the
Build Path dialog box for the Ruby project does not list any of my Java
projects as eligible to add to the build path. Should I explicitly
refer to C:\Workspace\ZooGlue\bin\zoo\utils\Truthiness.class in the
Ruby script somehow?
I am using Eclipse 3.4, DLTK 9.5, and my Ruby Interpreter executable is
C:\downloads\Ruby\jruby-1.1.4\bin\jruby.bat
######################################################################
# Project: Zuby
# File: TestTruthiness.rb
include Java
include_class Java::zoo.utils.Truthiness
def show(it)
println "" + it + ":\t" + isTrue(it) + "\t" + isFalse(it);
println "\t" + (it ? "true":"false") + "\t" + ((!it)?"true":"false")
end
0 ? "TRUE" : "FALSE"
show( true )
show( false )
show( 0 )
show( 1 )
show( null )
show( "bye" )
show( "" )
show( 'x' )
######################################################################
//////////////////////////////////////////////////////////////////////
// Project: ZooGlue
// File: Truthiness.java
package zoo.utils;
/**
* Everything is true except false and null.
*/
public class Truthiness {
static public boolean isFalse (Object o)
{
return o == null || Boolean.FALSE.equals(o);
}
static public boolean isTrue (Object o)
{
return isFalse(o) == false;
}
}
//////////////////////////////////////////////////////////////////////