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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality.

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/**********************************************************************
Copyright (c) 2014 Andy Jefferson and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Contributors:
    ...
**********************************************************************/
package org.datanucleus.identity;

import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

/**
 * This class is for identity with a single short field.
 */
public class ShortId extends SingleFieldId
{
    private short key;

    public ShortId(Class pcClass, short key)
    {
        super(pcClass);
        this.key = key;
        this.hashCode = targetClassName.hashCode() ^ key;
    }

    public ShortId(Class pcClass, Short key)
    {
        this(pcClass, key != null ? key.shortValue() : -1);
        assertKeyNotNull(key);
    }

    public ShortId(Class pcClass, String str)
    {
        this(pcClass, Short.parseShort(str));
        assertKeyNotNull(str);
    }

    public ShortId()
    {
    }

    public short getKey()
    {
        return key;
    }

    public Short getKeyAsObject()
    {
        return Short.valueOf(key);
    }

    /**
     * Return the String form of the key.
     * @return the String form of the key
     */
    public String toString()
    {
        return Short.toString(key);
    }

    public boolean equals(Object obj)
    {
        if (this == obj)
        {
            return true;
        }
        else if (!super.equals(obj))
        {
            return false;
        }
        else
        {
            ShortId other = (ShortId) obj;
            return key == other.key;
        }
    }

    public int compareTo(Object o)
    {
        if (o instanceof ShortId)
        {
            ShortId other = (ShortId) o;
            int result = super.compare(other);
            if (result == 0)
            {
                return (key - other.key);
            }
            return result;
        }
        else if (o == null)
        {
            throw new ClassCastException("object is null");
        }
        throw new ClassCastException(this.getClass().getName() + " != " + o.getClass().getName());
    }

    /**
     * Write this object. Write the superclass first.
     * @param out the output
     */
    public void writeExternal(ObjectOutput out) throws IOException
    {
        super.writeExternal(out);
        out.writeShort(key);
    }

    /**
     * Read this object. Read the superclass first.
     * @param in the input
     */
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
    {
        super.readExternal(in);
        key = in.readShort();
    }
}