SerialSerialKeyCreator.java

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: SerialSerialKeyCreator.java,v 12.1 2005/01/31 19:27:29 mark Exp $
 */

package com.sleepycat.bind.serial;

import com.sleepycat.db.DatabaseEntry;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.SecondaryDatabase;
import com.sleepycat.db.SecondaryKeyCreator;

public abstract class SerialSerialKeyCreator
    implements SecondaryKeyCreator {

    protected SerialBinding primaryKeyBinding;
    protected SerialBinding dataBinding;
    protected SerialBinding indexKeyBinding;

    public SerialSerialKeyCreator(ClassCatalog classCatalog,
                                  Class primaryKeyClass,
                                  Class dataClass,
                                  Class indexKeyClass) {

        this(new SerialBinding(classCatalog, primaryKeyClass),
             new SerialBinding(classCatalog, dataClass),
             new SerialBinding(classCatalog, indexKeyClass));
    }

    public SerialSerialKeyCreator(SerialBinding primaryKeyBinding,
                                  SerialBinding dataBinding,
                                  SerialBinding indexKeyBinding) {

        this.primaryKeyBinding = primaryKeyBinding;
        this.dataBinding = dataBinding;
        this.indexKeyBinding = indexKeyBinding;
    }

    // javadoc is inherited
    public boolean createSecondaryKey(SecondaryDatabase db,
                                      DatabaseEntry primaryKeyEntry,
                                      DatabaseEntry dataEntry,
                                      DatabaseEntry indexKeyEntry)
        throws DatabaseException {

        Object primaryKeyInput =
            primaryKeyBinding.entryToObject(primaryKeyEntry);
        Object dataInput = dataBinding.entryToObject(dataEntry);
        Object indexKey = createSecondaryKey(primaryKeyInput, dataInput);
        if (indexKey != null) {
            indexKeyBinding.objectToEntry(indexKey, indexKeyEntry);
            return true;
        } else {
            return false;
        }
    }

    // javadoc is inherited
    public boolean nullifyForeignKey(SecondaryDatabase db,
                                     DatabaseEntry dataEntry)
        throws DatabaseException {

        Object data = dataBinding.entryToObject(dataEntry);
        data = nullifyForeignKey(data);
        if (data != null) {
            dataBinding.objectToEntry(data, dataEntry);
            return true;
        } else {
            return false;
        }
    }

    public abstract Object createSecondaryKey(Object primaryKey, Object data);

    public Object nullifyForeignKey(Object data) {

        return null;
    }
}

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