package org.yaac.server.egql.evaluator.function;
import org.yaac.server.egql.evaluator.EvaluationResult;
import org.yaac.server.egql.exception.EGQLException;
import org.yaac.server.egql.processor.ProcessData.ProcessDataRecord;
import org.yaac.shared.ErrorCode;
import com.google.appengine.api.datastore.Category;
/**
* @author Max Zhu (thebbsky@gmail.com)
*
*/
public class CategoryFunction extends Function {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
public void validate() throws EGQLException {
FunctionUtil.ensureParamSize(ops, 1);
}
@Override
public EvaluationResult evaluate(ProcessDataRecord record) {
EvaluationResult r = ops.get(0).evaluate(record);
if (r.getPayload() instanceof String) {
Category val = new Category((String) r.getPayload());
return new EvaluationResult(val, r);
} else {
return r.withWarning(ErrorCode.W134);
}
}
}