[GROOVY-5543] Grab a Module Extension fails to match Map objects

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0-rc-4
• Fix Version/s: 2.0.1
• Component/s: Grape, groovy-jdk
• Environment: Snow Leopard OS X with Java 1.6
• Assignee: Cédric Champeau
• Reporter: Tim Yates
• Created: 22/Jun/12 04:53
• Updated: 26/Jul/12 16:49
• Resolved: 25/Jun/12 09:35

Description

There seems to be an issue with Modular Extensions not selecting the correct classes to decorate when @Grabbed

In my groovy-stream project, I define my extension class as:

package groovy.stream ;

import groovy.lang.Closure ;
import java.util.* ;

public class StreamExtension {
  public static Stream toStream( Closure delegate ) {
    return Stream.from( delegate ) ;
  }

  public static Stream toStream( Iterator delegate ) {
    return Stream.from( delegate ) ;
  }

  public static Stream toStream( Iterable delegate ) {
    return Stream.from( delegate ) ;
  }

  public static Stream toStream( Map delegate ) {
    return Stream.from( delegate ) ;
  }
}

If you then run a test class:

def m = [ x:1..3, y:5..7 ].toStream().where { x + 4 == y }
assert [[x:1,y:5],[x:2,y:6],[x:3,y:7]] == m.collect()

With groovy -cp groovy-stream-0.3-map.jar testscript.groovy, it all works fine, however if you push the jar to a maven repo, and change the test script to:

@GrabResolver( name='bloidonia', root='https://raw.github.com/timyates/bloidonia-repo/master' )
@Grab('com.bloidonia:groovy-stream:0.3-map')
import groovy.stream.Stream 

def m = [ x:1..3, y:5..7 ].toStream().where { x + 4 == y }
assert [[x:1,y:5],[x:2,y:6],[x:3,y:7]] == m.collect()

Then running groovy testscript.groovy, you get the exception:

Caught: groovy.lang.MissingMethodException: No signature of method: java.util.LinkedHashMap.toStream() is applicable for argument types: () values: []
Possible solutions: toString(), toString(), toString(), toString(), toSpreadMap(), spread()

If I change the extension class so that the Map function is replaced with:

  public static Stream toStream( LinkedHashMap delegate ) {
    return Stream.from( delegate ) ;
  }

Then running:

@GrabResolver( name='bloidonia', root='https://raw.github.com/timyates/bloidonia-repo/master' )
@Grab('com.bloidonia:groovy-stream:0.3')
import groovy.stream.Stream 

def m = [ x:1..3, y:5..7 ].toStream().where { x + 4 == y }
assert [[x:1,y:5],[x:2,y:6],[x:3,y:7]] == m.collect()

Works.