String2Locale.java

/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services 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 library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
package org.granite.messaging.amf.io.convert.impl;

import java.lang.reflect.Type;
import java.util.Locale;
import java.util.regex.Pattern;

import org.granite.messaging.amf.io.convert.Converter;
import org.granite.messaging.amf.io.convert.Converters;
import org.granite.messaging.amf.io.convert.IllegalConverterArgumentException;
import org.granite.messaging.amf.io.convert.Reverter;

/**
 * @author Franck WOLFF
 */
public class String2Locale extends Converter implements Reverter {

	private static final Pattern SPLITTER = Pattern.compile(Pattern.quote("_"));
	
    public String2Locale(Converters converters) {
        super(converters);
    }

    @Override
	protected boolean internalCanConvert(Object value, Type targetType) {
        return targetType.equals(Locale.class) && (value == null || value instanceof String);
    }

    @Override
	protected Object internalConvert(Object value, Type targetType) {
        if (value == null)
            return null;
        String[] tokens = SPLITTER.split((String)value, 3);
        if (tokens.length == 1)
        	return new Locale(tokens[0]);
        if (tokens.length == 2)
        	return new Locale(tokens[0], tokens[1]);
        if (tokens.length == 3)
        	return new Locale(tokens[0], tokens[1], tokens[2]);
        throw new IllegalConverterArgumentException(this, value, targetType, "Illegal Locale: " + value);
    }

	public boolean canRevert(Object value) {
		return (value == null) || (value instanceof Locale);
	}

	public Object revert(Object value) {
		if (value != null)
			value = value.toString();
		return value;
	}
}