IntegralType.java

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/*
 * NumericType.java
 *
 * Created on March 8, 2000
 */

package com.sun.jdo.spi.persistence.support.sqlstore.query.util.type;

/** 
 * This class represents the types
 * byte, short int, long and char
 *
 * @author  Michael Bouschen
 * @version 0.1
 */
public class IntegralType
    extends NumericType
{
    /**
     *
     */
    public IntegralType(String name, Class clazz, int enumType)
    {
        super(name, clazz, enumType);
    }

    /**
     * Converts the specified value into a value of this numeric type.
     * E.g. an Integer is converted into a Long, if this represents 
     * the numeric type long.
     * @param value value to be converted
     * @return converted value
     */
    public Number getValue(Number value)
    {
        Number ret = null;

        if (value == null)
            ret = null;
        else if ("int".equals(getName()))
            ret = new Integer(value.intValue());
        else if ("long".equals(getName()))
            ret = new Long(value.longValue());
        else if ("byte".equals(getName()))
            ret = new Byte(value.byteValue());
        else if ("short".equals(getName()))
            ret = new Short(value.shortValue());

        return ret;
    }
    
    /**
     * Returns -value. 
     * @param value value to be negated
     * @return -value
     */
    public Number negate(Number value)
    {
        Number ret = null;

        if (value == null)
            ret = null;
        else if ("int".equals(getName()))
            ret = new Integer(-value.intValue());
        else if ("long".equals(getName()))
            ret = new Long(-value.longValue());
        else if ("byte".equals(getName()))
            ret = new Byte((byte)-value.byteValue());
        else if ("short".equals(getName()))
            ret = new Short((short)-value.shortValue());

        return ret;
    }
}