atom feed14 messages in org.codehaus.groovy.userRe: [groovy-user] metaclass and curry...
FromSent OnAttachments
Bob BrownDec 28, 2008 11:04 pm 
Roshan DawraniDec 28, 2008 11:15 pm 
Roshan DawraniDec 28, 2008 11:43 pm 
Paul KingDec 29, 2008 1:29 am 
Paul KingDec 29, 2008 1:38 am 
Paul KingDec 29, 2008 1:50 am 
Roshan DawraniDec 29, 2008 2:14 am 
Bob BrownDec 29, 2008 3:29 am 
Jochen TheodorouDec 29, 2008 6:38 am 
Paul KingDec 29, 2008 2:02 pm 
Bob BrownDec 29, 2008 2:19 pm 
Paul KingDec 31, 2008 10:12 pm 
Bob BrownDec 31, 2008 10:20 pm 
Bob BrownJan 6, 2009 5:00 pm 
Subject:Re: [groovy-user] metaclass and curry() gives MissingMethodException
From:Paul King (pau@asert.com.au)
Date:Dec 29, 2008 1:50:07 am
List:org.codehaus.groovy.user

Yet another long version:

::::::::::::::: String.metaClass.fastSplit = {delim, expected -> def buffer = [] try { def tokens = new StringTokenizer(delegate, delim) expected.times{ buffer[it] = tokens.nextToken() } buffer.toArray() } catch (NoSuchElementException) { def msg = "Could not split '$delegate' into $expected items delimited by
'$delim'" throw new NoSuchElementException(msg) } }

def c = String.metaClass.pickMethod('fastSplit', null).closure.curry(",", 4) String.metaClass.fastSplitComma4 = { c.delegate = delegate; c() }

println "this,is,a,test".fastSplit(",", 4) println "this,is,a,test".fastSplitComma4() :::::::::::::::

Paul.

Paul King wrote:

Hi Bob,

I haven't worked out a short way yet but this works:

--------------- String.metaClass.fastSplit = {delim, expected -> def buffer = [] try { def tokens = new StringTokenizer(delegate, delim) for (int i = 0; i < expected; i++) buffer[i] = tokens.nextToken() buffer.toArray() } catch (NoSuchElementException e) { throw new NoSuchElementException("Could not successfully split line: '$line' into $expected items delimited by '$delim'") } }

def c = String.metaClass.methods.find{it.name=='fastSplit'}.closure.curry(",", 4) String.metaClass.fastSplitComma4 << { c.delegate = delegate; c() }

println "this,is,a,test".fastSplit(",", 4) println "this,is,a,test".fastSplitComma4()

---------------

We obviously need some clear short way to achieve the equivalent.

Paul.

Bob Brown wrote:

To me, the following is unexpected (this is probably my inexperience shining out, so please be gentle!). I couldn't find anything pointing me in the right direction on the list archives.

I have the following test:

=== package au.com.transentia.utils.test

public class FastSplitTest extends GroovyTestCase {

void setUp() { String.metaClass.fastSplit = {delim, expected -> def buffer = [] try { StringTokenizer st = new StringTokenizer(delegate, delim); for (int i = 0; i < expected; i++) buffer[i] = st.nextToken(); return buffer.toArray(); } catch (NoSuchElementException e) { throw new NoSuchElementException("Could not successfully split line: '" + line + "' into " + expected + " items delimited by '" + delim + "'"); } }

String.metaClass.fastSplitComma4 = String.metaClass.fastSplit.curry(",", 4) }

void testSplit() { assertArrayEquals(['this', 'is', 'a', 'test'].toArray(), "this,is,a,test".fastSplit(",", 4)) }

void testCurried() { assertArrayEquals(['this', 'is', 'a', 'test'].toArray(), "this,is,a,test".fastSplitComma4()) } } ===

This gives: === "C:\Program Files\Java\jdk1.6.0_11\bin\java" -Didea.launcher.port=7551 "-Didea.launcher.bin.path=C:\Program Files\JetBrains\IntelliJ IDEA 8.0.1\bin" -Dfile.encoding=windows-1252 -classpath "C:\DEVTOOLS\groovy-1.6-RC-1\embeddable\groovy-all-1.6-RC-1.jar;C:\Program

Files\Java\jdk1.6.0_11\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\jce.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\resources.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\rt.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.6.0_11\jre\lib\ext\sunpkcs11.jar;C:\DEVELOPMENT\IntelliJ\FB\

out\production\FB;C:\DEVTOOLS\commons-lang-2.4\commons-lang-2.4.jar;C:\DEVTO

OLS\groovy-1.6-RC-1\lib\junit-3.8.2.jar;C:\Program Files\JetBrains\IntelliJ IDEA 8.0.1\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 au.com.transentia.utils.test.FastSplitTest

groovy.lang.MissingMethodException: No signature of method: groovy.lang.ExpandoMetaClass$ExpandoMetaProperty.curry() is applicable for argument types: (java.lang.String, java.lang.Integer) values: {,, 4} at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapt

er.java:54) at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSit

e.java:51) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray

.java:43) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.

java:116) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.

java:128) at au.com.transentia.utils.test.FastSplitTest.setUp(FastSplitTest.groovy:21) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39

) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl

.java:25) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)

groovy.lang.MissingMethodException: No signature of method: groovy.lang.ExpandoMetaClass$ExpandoMetaProperty.curry() is applicable for argument types: (java.lang.String, java.lang.Integer) values: {,, 4} at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapt

er.java:54) at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSit

e.java:51) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.

java:128) at au.com.transentia.utils.test.FastSplitTest.setUp(FastSplitTest.groovy:21) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39

) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl

.java:25) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)

Process finished with exit code -1 ===

I also tried:

=== void setUp() { def fastSplit = {delim, expected -> def buffer = [] try { StringTokenizer st = new StringTokenizer(delegate, delim); for (int i = 0; i < expected; i++) buffer[i] = st.nextToken(); return buffer.toArray(); } catch (NoSuchElementException e) { throw new NoSuchElementException("Could not successfully split line: '" + line + "' into " + expected + " items delimited by '" + delim + "'"); } }

String.metaClass.fastSplit = fastSplit String.metaClass.fastSplitComma4 = fastSplit.curry(",", 4) } ===

But...as expected...delegate gets set to FastSplitTest class and so once gets:

=== groovy.lang.GroovyRuntimeException: Could not find matching constructor for: java.util.StringTokenizer(au.com.transentia.utils.test.FastSplitTest, java.lang.String) at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1465) at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1381) at org.codehaus.groovy.runtime.callsite.MetaClassConstructorSite.callConstructo

r(MetaClassConstructorSite.java:38) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(Ca

llSiteArray.java:55) at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrap

NoCoerce.callConstructor(ConstructorSite.java:108) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(Abstra

ctCallSite.java:203) at au.com.transentia.utils.test.FastSplitTest$_setUp_closure1.doCall(FastSplitT

est.groovy:26) [...more elided...] ===

Is there a way of doing what I need here?

Comments/suggestions gratefully received.

Cheers,

BOB

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