NotNullConstraint.java

package hu.sztaki.ilab.longneck.process.constraint;

import hu.sztaki.ilab.longneck.Record;
import hu.sztaki.ilab.longneck.process.VariableSpace;
import hu.sztaki.ilab.longneck.process.block.BlockUtils;
import java.util.ArrayList;
import java.util.List;

/**
 * Checks, if the specified field is null.
 * 
 * @author Molnar Peter <molnarp@sztaki.mta.hu>
 */
public class NotNullConstraint extends AbstractAtomicConstraint {

    @Override
    public CheckResult check(Record record, VariableSpace scope) {
        
        // Prepare result variable
        List<CheckResult> results = new ArrayList<CheckResult>(applyTo.size());
        
        for (String fieldName : applyTo) {
            if (BlockUtils.getValue(fieldName, record, scope) != null) {                
                results.add(new CheckResult(this, true, fieldName, 
                        BlockUtils.getValue(fieldName, record, scope), null));                
            } else {
                results.add(new CheckResult(this, false, fieldName, 
                        BlockUtils.getValue(fieldName, record, scope), null));
                
                return new CheckResult(this, false, null, null, null, results);
            }
        }
        
        return new CheckResult(this, true, null, null, null, results);
    }

    @Override
    public NotNullConstraint clone() {
        return (NotNullConstraint) super.clone();
    }
}