[groovy-user] How to use Enum with Range?
Pierre Thibault
I'am trying to use an Enum with a Range in Groovy to iterate of it. But I am unable to do so. Is it possible or am I force to use EnumSet instead?
Here is my sample code:
public enum Season {
WINTER, SPRING, SUMMER, FALL;
Season next() {
Season[] vals = Season.values();
if(ordinal() == vals.size()-1) throw new NoSuchElementException();
return vals[(this.ordinal() + 1) % vals.length];
}
Season previous() {
Season[] vals = Season.values();
return vals[(this.ordinal() - 1 + vals.length) % vals.length];
}
int compareTo(Season s)
{
ordinal <=> s.ordinal()
}
boolean hasNext()
{
Season[] vals = Season.values();
return ordinal() < vals.size()-1
}
}
//(Season.WINTER..Season.FALL).each { // This is not working
// println it
//}
EnumSet.range(Season.WINTER, Season.FALL).each { // This is working well
println it
}
Regards.
Pierre
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Guillaume Laforge
enum Seasons { SPRING, SUMMER, FALL, WINTER }
println "All seasons"
Seasons.each { println it }
println "\nJust a few seasons"
(Seasons.SPRING..Seasons.FALL).each { println it }
--
Guillaume Laforge
Groovy Project Manager
G2One, Inc. Vice-President Technology
http://www.g2one.com
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Pierre Thibault
>To: us...@groovy.codehaus.org
>Sent: Friday, May 16, 2008 4:33:27 PM
>Subject: Re: [groovy-user] How to use Enum with Range?
>
>I don't think you need to implement your own next() or compareTo().
>
>enum Seasons { SPRING, SUMMER, FALL, WINTER }
>
>println "All seasons"
>Seasons.each { println it }
>
>println "\nJust a few seasons"
>(Seasons.SPRING..Seasons.FALL).each { println it }
All seasons
class Seasons
Just a few seasons
Exception in thread "main" groovy.lang.MissingMethodException: No signature of method: Seasons.next() is applicable for argument types: () values: {}
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:54)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:59)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:169)
at Seasons.invokeMethod(Test.groovy)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:777)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:753)
at groovy.lang.ObjectRange.increment(ObjectRange.java:376)
at groovy.lang.ObjectRange.size(ObjectRange.java:276)
at groovy.lang.ObjectRange$1.hasNext(ObjectRange.java:207)
at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:989)
at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:967)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.runtime.metaclass.ReflectionMetaMethod.invoke(ReflectionMetaMethod.java:51)
at org.codehaus.groovy.runtime.metaclass.NewInstanceMetaMethod.invoke(NewInstanceMetaMethod.java:54)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:599)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:904)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:740)
at org.codehaus.groovy.runtime.InvokerHelper.invokePojoMethod(InvokerHelper.java:761)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:749)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:167)
at Test.run(Test.groovy:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:95)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:599)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:904)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:740)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:773)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:753)
at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:402)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:95)
at org.codehaus.groovy.runtime.MetaClassHelper.doMethodInvoke(MetaClassHelper.java:599)
at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1077)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:744)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:167)
at Test.main(Test.groovy)
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Pierre Thibault
I found that your code is working at the command line but not inside Eclipse. So the problem is with my environment. I am going to check this...
Thank you.
Guillaume Laforge
There were some issues in the past with ranges of enums, but it's been
fixed pretty recently.
Pierre Thibault
I am now running the script in Eclipse as a external tool calling the groovy binary directly.
Could someone else try the script of Guillaume to run it in Eclipse using the plugin, please?
---------------
Pierre
Ray Tayek
>I am unable to run this script using the Groovy Eclipse plugin. I
>have this problem specifically with this script. All my other
>scripts are working well. Moving the code in another working project
>does not help and give the same error.
>
>I am now running the script in Eclipse as a external tool calling
>the groovy binary directly.
>
>Could someone else try the script of Guillaume to run it in Eclipse
>using the plugin, please?
this works for me from the command line with groovy 1.5.5, but fails
in eclipse which has the plugin
org.codehaus.groovy.eclipse.ui_1.5.1.200801232227.jar. i get the: "
... No signature of method: Seasons.next() is applicable for argument
types: () values: {} ... "
thanks
> <<mailto:pthib...@yahoo.ca>pthib...@yahoo.ca>
> > <http://www.g2one.com>http://www.g2one.com
> >
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>--
>Guillaume Laforge
>Groovy Project Manager
>G2One, Inc. Vice-President Technology
><http://www.g2one.com>http://www.g2one.com
>
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Pierre Thibault
So to use the plugin I have to build from the svn version to be up to date? It would be nice to synchronize the release of the plugin with the release of Groovy.
A+
Pierre Thibault
I made an update by building the Groovy Eclipse from the svn version. Now things are working just fine. :-)
---------------
Pierre
abraham.m...@wipro.com
I have a map that takes a string as key and an ArrayList as value. The
arraylist contains a list of strings.
if(documentMap."$theWord")
{
(documentMap."$theWord").add(processedLine)
}
else
{
ArrayList textList = new ArrayList();
textList.add(processedLine);
documentMap.put(theWord,textList);
}
The q is, can I do it in one line? At least the else part?
Something like
documentMap[theWord] = (documentMap.get[theWord,new
ArrayList().add(processedLine)])
Where the "get" method will put in a "default" value for the ArrayList
the very first time and next time onwards it will just add values to the
arraylist.
Thanks,
Abraham.
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Jochen Theodorou
> Hi
>
> I have a map that takes a string as key and an ArrayList as value. The
> arraylist contains a list of strings.
>
> if(documentMap."$theWord")
> {
> (documentMap."$theWord").add(processedLine)
> }
> else
> {
> ArrayList textList = new ArrayList();
> textList.add(processedLine);
> documentMap.put(theWord,textList);
> }
>
> The q is, can I do it in one line? At least the else part?
>
> Something like
> documentMap[theWord] = (documentMap.get[theWord,new
> ArrayList().add(processedLine)])
>
> Where the "get" method will put in a "default" value for the ArrayList
> the very first time and next time onwards it will just add values to the
> arraylist.
I have a method like this... and it is called get ;)
documentMap.get(theWord,[processedLine])
a few comments:
* [processedLine] will create an ArrayList and add the claues in []
* documentMap."$theWord" will use a GString to lookup the key in the
map, but GStrings are not totally equal to String, better don't use them
as key for storing or getting values.
bye blackdrag
--
Jochen "blackdrag" Theodorou
The Groovy Project Tech Lead (http://groovy.codehaus.org)
http://blackdragsview.blogspot.com/
http://www.g2one.com/
abraham.m...@wipro.com
Thank You! This works beautifully.
Now my code reads like
documentMap[theWord] ? (documentMap.get(theWord)).add(processedLine) :
documentMap.get(theWord,[processedLine])
With no messy array initializations!! And its all in one line...:D
Thanks,
Abraham
documentMap.get(theWord,[processedLine])
bye blackdrag
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