DefaultFieldValidator.java

/*
 * @copyright 2013 Philip Warner
 * @license GNU General Public License
 * 
 * This file is part of Book Catalogue.
 *
 * Book Catalogue is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Book Catalogue is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Book Catalogue.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.eleybourn.bookcatalogue.datamanager;

import com.eleybourn.bookcatalogue.R;

/**
 * Validator to apply a default String value to empty fields.
 * 
 * @author Philip Warner
 *
 */
public class DefaultFieldValidator implements DataValidator {
	protected String mDefault;
	/**
	 * Allow for no default value.
	 */
	DefaultFieldValidator() {
		this("");
	}
	/**
	 * Constructor with default value
	 * @param defaultValue Default to apply
	 */
	DefaultFieldValidator(String defaultValue) {
		mDefault = defaultValue;
	}

	@Override
	public void validate(DataManager data, Datum datum, boolean crossValidating) {
		if (! datum.isVisible()) {
			// No validation required for invisible fields
			return;
		}
		Object value = data.get(datum);
		// Default validator does not cross-validate
		if (crossValidating)
			return;

		try {
			if (value.toString().trim().equals("")) {
				data.putString(datum, mDefault);
			}
			return;
		} catch (Exception e) {
			throw new ValidatorException(R.string.vldt_unable_to_get_value, new Object[]{datum.getKey()});
		}
	}
}