Finding Available Java Constructors / Methods For ColdFusion Objects

Posted August 17, 2006 at 3:57 PM by Ben Nadel

Tags: ColdFusion

Reader Comments

Ben, I wanted to let you know I adapted these functions into cfscript (what can I say, I dig the quasi-ECMA thing) and they have been a life saver. I'm working on a gi-normous project to bridge our company's CF-based software with a third-party vendor's system via their web service. Unfortunately, the 3p's documentation is Cruddy McCrap. Their sample code and docs are often out of date or just plain wrong. Now I can see precisely what parameter types are expected. We'll see if this works in comment form, but here it is (if you're curious about some of the variable names I often prefix my variables with a letter to indicate the expected datatype s=string n=numeric k=struct etc)...

<pre>
function getJavaClassMethodParameters(sMethod) {
//Returns the arguments for the given Java method call.
var kLocal = StructNew();
var i = 0;

kLocal.Parameters = Arguments.sMethod.GetParameterTypes();
kLocal.ParamList = "";

for (i=1; i lte ArrayLen(kLocal.Parameters); i=i+1) {
kLocal.ParamList = ListAppend(kLocal.ParamList, kLocal.Parameters[i].GetName());
}
kLocal.ParamList = Replace(kLocal.ParamList, ",", ", ", "ALL");
return kLocal.ParamList;
}

function getJavaClassMethods(oObject) {
//This takes an object and returns a query of all the available Java methods including constructors.
var kLocal = StructNew();
var i = 0;

kLocal.MethodQuery = QueryNew("name, returntype, parameters, isconstructor");
try {
kLocal.ClassConstructors = Arguments.oObject.GetClass().GetConstructors();
}
catch (Any e) {
kLocal.ClassConstructors = ArrayNew(1); // no constructors found.
}
try {
kLocal.ClassMethods = Arguments.oObject.GetClass().GetMethods();
}
catch (Any e) {
kLocal.ClassMethods = ArrayNew(1);
}

if (ArrayLen(kLocal.ClassConstructors) + ArrayLen(kLocal.ClassMethods) gt 0) {
QueryAddRow(kLocal.MethodQuery, (ArrayLen(kLocal.ClassConstructors) + ArrayLen(kLocal.ClassMethods)));
}

for (i=1; i lte ArrayLen(kLocal.ClassConstructors); i=i+1) {
kLocal.MethodQuery["name"][i] = kLocal.ClassConstructors[i].GetName();
kLocal.MethodQuery["returntype"][i] = Arguments.oObject.GetClass().GetName();
kLocal.MethodQuery["parameters"][i] = GetJavaClassMethodParameters(kLocal.ClassConstructors[i]);
kLocal.MethodQuery["isconstructor"][i] = 1;
}
kLocal.Offset = (i - 1);

for (i=1; i lte ArrayLen(kLocal.ClassMethods); i=i+1) {
kLocal.MethodQuery["name"][kLocal.Offset + i] = kLocal.ClassMethods[i].GetName();
kLocal.MethodQuery["returntype"][kLocal.Offset + i] = kLocal.ClassMethods[i].GetReturnType().GetName();
kLocal.MethodQuery["parameters"][kLocal.Offset + i] = GetJavaClassMethodParameters(kLocal.ClassMethods[i]);
kLocal.MethodQuery["isconstructor"][kLocal.Offset + i] = 0;
}

return getJavaClassMethodsQuery(kLocal.MethodQuery);
}

</pre>

Oops...well so much for using the <pre> tag. :-)

Jeremy,

Sorry it has taken me so long to comment on your stuff. I think it's awesome. I especially like the TRY / CATCH blocks you put in. I started to realize that some of these things do throw errors and I have been too lazy to fix it.

Well done dude, well done.

Just to let you know in the first code block you don't need to do a replace on the delimiter to space it out. You can simply provide the comma and the space as the delimiter in the listAppend function call. For example, you could do just this: ListAppend("myString", myList, ", ") and it'll work just fine.

You are the man! Simple as that :-)

Hey, this is strange! Coldfusion thinks a string is the same as a number...

<cfset cftype="marc bakker is cool-a-dude">
<cfdump var="#getJavaClassMethods(cftype)#">

gives me the same underlying Java constructors and methodnames as

<cfset cftype=5>
<cfdump var="#getJavaClassMethods(cftype)#">

Why is this??

Marc

@Marc,

ColdFusion seems to like storing most simple data types as Strings. It will, from time to time, depending on the type of simple value, use a different underlying data type. But, a lot of the time it is a string.

For example:

<cfset x = 1.5 />

... will result in a string. But, this:

<cfset x = createTimeSpan( 1, 12, 0, 0 ) />

... will result in a Double (also 1.5). Also, I believe that now() will return a date/time stamp.

Ctrl+S :-)

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