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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) 2004 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.metadata;

/**
 * Representation of the values for inheritance "strategy".
 * A brief description of the strategies
 * 
 * subclass-table - the fields of this class are persisted into the table(s) of subclasses.
 * new-table - the fields of this class are persisted into its own table.
 * superclass-table - the fields of this class are persisted into the table of its superclass
 * complete-table - the fields of this class and all fields of superclasses are persisted into its own table.
 * 
 */
public enum InheritanceStrategy
{
    SUBCLASS_TABLE("subclass-table"),
    NEW_TABLE("new-table"),
    SUPERCLASS_TABLE("superclass-table"),
    COMPLETE_TABLE("complete-table");

    String name;

    private InheritanceStrategy(String name)
    {
        this.name = name;
    }

    public String toString()
    {
        return name;
    }

    /**
     * Obtain a InheritanceStrategy for the given name by value
     * @param value the name
     * @return the InheritanceStrategy found or InheritanceStrategy.NEW_TABLE if not found.
     *     Nothing specified returns null
     */
    public static InheritanceStrategy getInheritanceStrategy(final String value)
    {
        if (value == null)
        {
            return null;
        }
        else if (InheritanceStrategy.SUBCLASS_TABLE.toString().equals(value))
        {
            return InheritanceStrategy.SUBCLASS_TABLE;
        }
        else if (InheritanceStrategy.NEW_TABLE.toString().equals(value))
        {
            return InheritanceStrategy.NEW_TABLE;
        }
        else if (InheritanceStrategy.SUPERCLASS_TABLE.toString().equals(value))
        {
            return InheritanceStrategy.SUPERCLASS_TABLE;
        }
        else if (InheritanceStrategy.COMPLETE_TABLE.toString().equals(value))
        {
            return InheritanceStrategy.COMPLETE_TABLE;
        }
        return InheritanceStrategy.NEW_TABLE;
    }
}