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Subject: RE:  Map nullValue to empty collection
Date: Fri, 9 Feb 2007 10:38:16 -0800
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Thread-Topic: Map nullValue to empty collection
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References: <eqhg1v$cf7$1@sea.gmane.org>
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Depending on whether you need to be able to "add/remove" from the
Objects list after its set:

public void setObjects(List<Object> objects) {
    this.objects =3D objects =3D=3D null ? Collections.emptyList() : =
objects;
}=20
// or
public void setObjects(List<Object> objects) {
    this.objects =3D objects =3D=3D null ? new ArrayList<Object>() : =
objects;
}=20


-----Original Message-----
From: news [mailto:news@sea.gmane.org] On Behalf Of Stephane Bailliez
Sent: Friday, February 09, 2007 1:49 AM
To: user-java@ibatis.apache.org
Subject: Map nullValue to empty collection


I have a setter which does no accept null values for a list, ie:

public void setObjects(List<Object> objects){
    if (objects =3D=3D null) throw new NullPointerException("null not
permitted");
    this.objects =3D objects;
}

I did not find yet any decent way to map a nullvalue to an empty list, I
was thinking of using a specific TypeHandlerCallback on this property on
the result map but did not go this route yet.

For now dumbest thing I could do was to remove the check and do nothing
if objects is null, other possibility include an intermediate holder
object...or ?

Any suggestions welcome.

-- stephane