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return type String[] [message #842243]

Thu, 12 April 2012 05:42

Ludwig Moser

Messages: 476
Registered: July 2009

Senior Member

hello!

how can i define return type of String (or any other) array?
eg. if i have a list of objects (reference to other class) which is always a list (i know i could change this to array) and i have another EOperation defined, which gains me (Eg.) the names of those objects.

Class stringArrayClass = Array.newInstance(String.class, 0).getClass();

thats how i can gain the class, but referencing Ljava.lang.String won't work, as it won't work with reflection either - for sure.

thanks in advance
ludwig

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Re: return type String[] [message #845614 is a reply to message #842243]

Sun, 15 April 2012 08:12

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

Ludwig,

Comments below.

On 12/04/2012 7:42 AM, Ludwig Moser wrote:
> hello!
>
> how can i define return type of String (or any other) array?
You have to define an EDataType but like we've done for EByteArray which
wraps byte[] and you have to implement the to and from string conversion
methods in the factory.
> eg. if i have a list of objects (reference to other class) which is
> always a list (i know i could change this to array) and i have another
> EOperation defined, which gains me (Eg.) the names of those objects.
>
> Class stringArrayClass = Array.newInstance(String.class, 0).getClass();
> thats how i can gain the class, but referencing Ljava.lang.String
> won't work, as it won't work with reflection either - for sure.
>
> thanks in advance
> ludwig

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: return type String[] [message #849424 is a reply to message #845614]

Thu, 19 April 2012 06:11

Ludwig Moser

Messages: 476
Registered: July 2009

Senior Member

so for anyone trying to do the same and no clue what to do

1) create a new DataType
set Name to: EStringArray
set instance Class Name to: java.lang.String[]
check isSerializable

2) build the model
go to yourPackage.ABCFactoryImpl and put these lines in the create/convert-EStringArrayFrom/ToString

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated NOT
	 */
	public String[] createEStringArrayFromString(EDataType eDataType, String initialValue) {
		return initialValue.split("\n");
	}

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated NOT
	 */
	public String convertEStringArrayToString(EDataType eDataType, Object instanceValue) {
		String[] array = (String[]) instanceValue;
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < array.length; i++) {
			sb.append(array[i]);
			if (i<array.length-1) {
				sb.append("\n");
			}
		}
		return sb.toString();
	}

note: you can replace "\n" by anything you are NOT using in the strings...
i used "\n" as my data always contains single line elements, so "\n" is not possible in my case.
finally use your datatype in EMF

thanks ed! works like charm

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