PalletLabelValidator.java

package edu.ualberta.med.biobank.validators;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.eclipse.core.databinding.validation.ValidationStatus;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;

import edu.ualberta.med.biobank.gui.common.validators.AbstractValidator;

public class PalletLabelValidator extends AbstractValidator {

    /**
     * Accept combinations of 2 letters or 2 digits or one letter and one digit.
     * Need at least 3 repetitions
     */
    private static final Pattern PATTERN = Pattern
        .compile("^(([A-Z]{2})|([A-Z][0-9])|([0-9]{2})){3,}"); //$NON-NLS-1$

    public PalletLabelValidator(String message) {
        super(message);
    }

    @Override
    public IStatus validate(Object value) {
        if (value != null && !(value instanceof String)) {
            throw new RuntimeException(
                Messages.PalletLabelValidator_nonstring_error_msg);
        }

        if (value != null) {
            String v = (String) value;
            Matcher m = PATTERN.matcher(v);
            if (m.matches()) {
                hideDecoration();
                return Status.OK_STATUS;
            }
        }
        showDecoration();
        return ValidationStatus.error(errorMessage);
    }

}