/**
 * DataCleaner (community edition)
 * Copyright (C) 2014 Neopost - Customer Information Management
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.datacleaner.util.convert;

import org.datacleaner.api.Converter;

public class NullConverter implements Converter<Object> {

    @Override
    public Object fromString(final Class<?> type, final String serializedForm) {
        if (!"<null>".equals(serializedForm)) {
            throw new IllegalArgumentException("Null expected, but found: " + serializedForm);
        }
        return null;
    }

    @Override
    public String toString(final Object instance) {
        if (null != instance) {
            throw new IllegalArgumentException("Null expected, but found: " + instance);
        }
        return "<null>";
    }

    @Override
    public boolean isConvertable(final Class<?> type) {
        return null == type;
    }

    public boolean isNull(final String serializedForm) {
        return "<null>".equals(serializedForm);
    }
}