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Cause an unsettable EInt attribute to be unset by default? [message #1142338]

Thu, 17 October 2013 15:00

Eclipse User

Hello everybody.

In E4 we have a modelled UI. Our Window class has 4 integer attributes to represent the x, y, height, and width of the window. We'd like to make these unsettable by default. When unset, they default to wherever the OS chooses to place the window; when set, they are used to force the window bounds.

Is there any way to modify the .ecore to cause these fields to default to an unset state? Or do I have to modify the generated WindowImpl to set the appropriate __ESet variables?

	/**
	 * The default value of the '{@link #getX() <em>X</em>}' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see #getX()
	 * @generated
	 * @ordered
	 */
	protected static final int X_EDEFAULT = 0;

	/**
	 * The cached value of the '{@link #getX() <em>X</em>}' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see #getX()
	 * @generated
	 * @ordered
	 */
	protected int x = X_EDEFAULT;

	/**
	 * This is true if the X attribute has been set.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	protected boolean xESet;

Thanks!

Brian.

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Re: Cause an unsettable EInt attribute to be unset by default? [message #1142366 is a reply to message #1142338]

Thu, 17 October 2013 15:24

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Make sure the features are Unsettable.

Make sure the Default Value Literal is really blank; (Use the Restore
Default Value icon/command otherwise you get the empty string rather
than null).

Regards

Ed Willink

On 17/10/2013 16:00, Brian de Alwis wrote:
> Hello everybody.
>
> In E4 we have a modelled UI. Our Window class has 4 integer
> attributes to represent the x, y, height, and width of the window.
> We'd like to make these unsettable by default. When unset, they
> default to wherever the OS chooses to place the window; when set, they
> are used to force the window bounds.
>
> Is there any way to modify the .ecore to cause these fields to default
> to an unset state? Or do I have to modify the generated WindowImpl to
> set the appropriate __ESet variables?
>
>
> /**
> * The default value of the '{@link #getX() X}' attribute.
> * 
> * 
> * @see #getX()
> * @generated
> * @ordered
> */
> protected static final int X_EDEFAULT = 0;
>
> /**
> * The cached value of the '{@link #getX() X}' attribute.
> * 
> * 
> * @see #getX()
> * @generated
> * @ordered
> */
> protected int x = X_EDEFAULT;
>
> /**
> * This is true if the X attribute has been set.
> * 
> * 
> * @generated
> * @ordered
> */
> protected boolean xESet;
>
>
> Thanks!
>
> Brian.

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Re: Cause an unsettable EInt attribute to be unset by default? [message #1142421 is a reply to message #1142366]

Thu, 17 October 2013 16:07

Eclipse User

Thanks for the reply Ed. I had already done what you suggested (I should have included the extract from the .ecore), but it makes no difference. I suspect it's because EInts have a default of 0, and not null like a reference object.

        <eStructuralFeatures xsi:type="ecore:EAttribute" name="x" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"
            unsettable="true">
          <eAnnotations source="http://www.eclipse.org/emf/2002/GenModel">
            <details key="documentation" value="&lt;p>&#xD;&#xA;The 'X' position of this window&#xD;&#xA;&lt;/p>"/>
          </eAnnotations>
        </eStructuralFeatures>

Brian.

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Re: Cause an unsettable EInt attribute to be unset by default? [message #1142499 is a reply to message #1142421]

Thu, 17 October 2013 17:14

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

/**
* This is true if the X attribute has been set.
* 
* 
* @generated
* @ordered
*/
protected boolean xESet;

You had it right all along. There is an XESet variable whose default is
false. The EInt obviously has all 2^32 valid values so the extra not-set
has to be handled by an extra boolean.

Regards

Ed Willink

On 17/10/2013 17:07, Brian de Alwis wrote:
> Thanks for the reply Ed. I had already done what you suggested (I
> should have included the extract from the .ecore), but it makes no
> difference. I suspect it's because EInts have a default of 0, and not
> null like a reference object.
>
>
> <eStructuralFeatures xsi:type="ecore:EAttribute" name="x"
> eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"
> unsettable="true">
> <eAnnotations source="http://www.eclipse.org/emf/2002/GenModel">
> <details key="documentation" value="
> The 'X' position of this window
> "/>
> </eAnnotations>
> </eStructuralFeatures>
>
>
> Brian.

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