BigIntegerInstantiator.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.util.instantiator;

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.granite.messaging.amf.io.util.externalizer.BigIntegerExternalizer;
import org.granite.messaging.service.ServiceException;

/**
 * @author Franck WOLFF
 */
public class BigIntegerInstantiator extends AbstractInstantiator<BigInteger> {

	private static final long serialVersionUID = 1L;

	private static final String VALUE = "value";
	
	private static final List<String> orderedFields;
    static {
        List<String> of = new ArrayList<String>(1);
        of.add(VALUE);
        orderedFields = Collections.unmodifiableList(of);
    }

    public BigIntegerInstantiator() {
    }

    @Override
    public List<String> getOrderedFieldNames() {
        return orderedFields;
    }

    @Override
    public BigInteger newInstance() {
        BigInteger bigInteger = null;

        String value = (String)get(VALUE);
        
        if (value != null && value.length() == 1) {
        	switch (Character.toLowerCase(value.charAt(0))) {
        		case '0':
        			bigInteger = BigInteger.ZERO;
        			break;
        		case '1':
        			bigInteger = BigInteger.ONE;
        			break;
        		case 'a':
        			bigInteger = BigInteger.TEN;
        			break;
        	}
        }

        if (bigInteger == null) try {
            bigInteger = new BigInteger(value, BigIntegerExternalizer.RADIX);
        }
        catch (NumberFormatException e) {
            throw new ServiceException("Illegal BigInteger value (base " + BigIntegerExternalizer.RADIX + "): " + value, e);
        }

        return bigInteger;
    }
}