[jdjlist] RE: Determine type from text

[Alastair Rodgers]

Title: Message

Unfortunately I you can't do the class cast "paramValue = (paramClass)..." using the class type from Class.forName() - I believe it won't get past the compiler.

 

 

-----Original Message-----
From: Conway. Fintan (IT Solutions) [mailto:[EMAIL PROTECTED]]
Sent: 12 September 2002 16:27
To: JDJList
Subject: [jdjlist] RE: Determine type from text

Hi Jeff,

 

    You could try :

                    String paramType = null;

                    String[] primitives = {"byte", "short", "char", "int", "long", "float"," double", "boolean"};    // Finite list of primitives

                    ArrayList primitiveList = Arrays.asList(primitives)

 

                    //  retrieve the parameter type from the XML

                    paramType = ...

                   

                    if (primitiveList.contains(paramType) {    // the parameter type is a primitive

                   

                    } else {                                                                // the parameter type is a Class of some sort

                            Class paramClass = class.forName(paramType);

                            Object paramValue = paramClass.newInstance();

                            paramValue = (paramClass)...                    // retrieve the value from XML doc

                    }

 

I have not tested this code, and am not 100% sure if the Class class works this way.  It seems that XML parsers/readers should have some method to perform type conversions like this automatically.

 

Regards,

 

Fintan

-----Original Message-----
From: Jeff Fisher [mailto:[EMAIL PROTECTED]]
Sent: 12 September 2002 15:37
To: JDJList
Subject: [jdjlist] RE: Determine type from text

Ok, let me refraise what I need to do.  I know what the types are for the parameters by the xml doc or by the getParameterTypes method.  The question now becomes, how do I convert the values of the parameters from the xml file into the correct types so I can pass those to the method.  This is where I'm having problems.

 

For example:

I need to somehow take the string 100 and create the correct method argument (an int) without knowing ahead of time that the param is an int.  The code that has to do this has no intrinsic knowledge of the method being called.

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 12, 2002 10:13 AM
To: JDJList
Subject: [jdjlist] RE: Determine type from text

Jeff,

I am not sure if your question is regarding whether or not an object can be represented using XML or if you are trying to find out the types of the parameters of a method.

I will assume the second. If I am wrong, so sorry:)

Since you have already looked at reflection, did you try the java.lang.reflect.Method.getParameterTypes()? This returns an array containing one class object for each of the method's parameters.

Chikeobi O. Njaka

-----Original Message-----
From: Jeff Fisher [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 12, 2002 5:51 AM
To: JDJList
Subject: [jdjlist] Determine type from text

Given the following xml file:

<?xml version="1.0"?>
<ServiceRequest>
   <Service>
      com.emerywaterhouse.websvc.FrtCalc
   </Service>
   <Method>
      getFreightCharge
   </Method>
   <Param>
      <Type>
        String
      </Type>
      <Value>
         UPSG
      </Value>
   </Param>
   <Param>
      <Type>
         String
      </Type>
      <Value>
         04104
      </Value>
   </Param>
   <Param>
     <Type>
         int
      </Type>
      <Value>
         100
      </Value>
   </Param>
</ServiceRequest>

Using reflection I can create the class, and call the method.  The only problem is determining and converting the parameters to the correct type.  I suppose I can use a brute force method and have a large number of if else statements, but that doesn't seem viable.  Also, if the parameter is an object, I'll never be able to code for all possible objects.

I've looked through a number of resources, but nothing I've seen has examples of determining the types for parameters.

Does anyone have a suggestion here or a resource I can look at.

TIA

Jeff

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