TupleSerialKeyCreator.java

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: TupleSerialKeyCreator.java,v 12.2 2005/08/01 20:25:08 mark Exp $
 */

package com.sleepycat.bind.serial;

import com.sleepycat.bind.tuple.TupleBase;
import com.sleepycat.bind.tuple.TupleInput;
import com.sleepycat.bind.tuple.TupleOutput;
import com.sleepycat.db.DatabaseEntry;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.SecondaryDatabase;
import com.sleepycat.db.SecondaryKeyCreator;

public abstract class TupleSerialKeyCreator extends TupleBase
    implements SecondaryKeyCreator {

    protected SerialBinding dataBinding;

    public TupleSerialKeyCreator(ClassCatalog classCatalog, Class dataClass) {

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

    public TupleSerialKeyCreator(SerialBinding dataBinding) {

        this.dataBinding = dataBinding;
    }

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

        TupleOutput output = getTupleOutput(null);
        TupleInput primaryKeyInput = entryToInput(primaryKeyEntry);
        Object dataInput = dataBinding.entryToObject(dataEntry);
        if (createSecondaryKey(primaryKeyInput, dataInput, output)) {
            outputToEntry(output, 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 boolean createSecondaryKey(TupleInput primaryKeyInput,
                                               Object dataInput,
                                               TupleOutput indexKeyOutput);

    public Object nullifyForeignKey(Object data) {

        return null;
    }
}

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