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which precondition should I add?

gaoxiaoleigaoxiaolei Member Posts: 12 Contributor II
edited November 2018 in Help
Hi, everyone.

I developed a operator. This operator can only deal with exampleset has two attributes. I do not konw which precondition should I add to this operator. Could you help me?

Thanks.
gaoxiaolei
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    StaryVenaStaryVena Member Posts: 126 Contributor II
    Hi,
    if I understand what you want, it should looks like this: 

    inputPort.addPrecondition(new SimplePrecondition(inputPort, new MetaData(
    				ExampleSet.class)));
    It doesn't matter how many attributes ExampleSet have.
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    gaoxiaoleigaoxiaolei Member Posts: 12 Contributor II
    StaryVena wrote:

    Hi,
    if I understand what you want, it should looks like this: 

    inputPort.addPrecondition(new SimplePrecondition(inputPort, new MetaData(
    				ExampleSet.class)));
    It doesn't matter how many attributes ExampleSet have.
    Hi, thanks. But my opeator can only cope with exampleset which has only two attributes.
    I want this: if a exampleset with more than two attributes, and it connect to my opeator, there should be a error appeard.
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    Marco_BoeckMarco_Boeck Administrator, Moderator, Employee, Member, University Professor Posts: 1,995 RM Engineering
    Hi,

    there are a couple of ways to achieve this, for example you can use the already mentioned SimplePrecondition class: 

    inputPort.addPrecondition(new SimplePrecondition(inputPort, new MetaData(ExampleSet.class), true) {

    @Override
    	/** Override this method to make additional checks. The default implementation does nothing. */
    	public void makeAdditionalChecks(MetaData received) {	
    		if (((ExampleSetMetaData)received).getAllAttributes().size() != 2) {
    			inputPort.addError(new SimpleMetaDataError(Severity.ERROR, inputPort, "I18N.key"));
    		}
    	}
    });

    Regards,
    Marco
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