Step by step tutorial: how to build a bean for Servoy - Servoy Stuff

How to build a bean for Servoy - A step by step tutorial brought to you by Servoy Stuff
The testChanged() method doesn’t exist yet in our class, but there is little Eclipse won’t do for you if
you ask it nicely with a “Quick Fix” trick:
This will add the method stub directly in our WicketTestBean class (even if the java file is not opened)!
And now, do you remember what we did in our Swing bean before we updated our record That’s
right, we checked if an update was needed by comparing the value of the new text to the previous
version.
Which means we need to add a previousText variable to our class:
protected String previousText;
And then update its value when Servoy sets a selected record:
public void setSelectedRecord(IRecord record) {
this.currentRecord = record;
if (ServoyUtils.isContainedInFoundset(currentRecord,getDataProviderID())) {
Object o = currentRecord.getValue(getDataProviderID());
this.text = (o==null) null : o.toString();
this.previousText = getText();
setChanged();
}
}
Now that our previousText value is coherent, we can use it to test if the new value is really « new » :
/**
* Will trigger an update if the text has changed:
*/
public void testChanged() {
if (!Utils.stringSafeEquals(previousText, getText())) {
setChanged();
}
}
You remember the Utils.stringSafeEquals we used in our Swing bean. Same thing here, and if it is
needed we set our ChangesRecorder to “changed”.
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