src/main/java/com/sleepycat/persist/impl/NonPersistentFormat.java

/*-
 * Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This file was distributed by Oracle as part of a version of Oracle Berkeley
 * DB Java Edition made available at:
 *
 * http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
 *
 * Please see the LICENSE file included in the top-level directory of the
 * appropriate version of Oracle Berkeley DB Java Edition for a copy of the
 * license and additional information.
 */

package com.sleepycat.persist.impl;

import java.lang.reflect.Array;
import java.util.Map;

import com.sleepycat.compat.DbCompat;
import com.sleepycat.persist.model.EntityModel;

/**
 * Format for a non-persistent class that is only used for declared field
 * types and arrays.  Currently used only for Object and interface types.
 *
 * @author Mark Hayes
 */
class NonPersistentFormat extends Format {

    private static final long serialVersionUID = -7488355830875148784L;

    NonPersistentFormat(Catalog catalog, Class type) {
        super(catalog, type);
    }

    @Override
    void initialize(Catalog catalog, EntityModel model, int initVersion) {
    }

    @Override
    void collectRelatedFormats(Catalog catalog,
                               Map<String, Format> newFormats) {
    }

    @Override
    Object newArray(int len) {
        return Array.newInstance(getType(), len);
    }

    @Override
    public Object newInstance(EntityInput input, boolean rawAccess) {
        throw DbCompat.unexpectedState
            ("Cannot instantiate non-persistent class: " + getClassName());
    }

    @Override
    public Object readObject(Object o, EntityInput input, boolean rawAccess) {
        throw DbCompat.unexpectedState();
    }

    @Override
    void writeObject(Object o, EntityOutput output, boolean rawAccess) {
        throw DbCompat.unexpectedState();
    }

    @Override
    void skipContents(RecordInput input) {
        throw DbCompat.unexpectedState();
    }

    @Override
    boolean evolve(Format newFormat, Evolver evolver) {
        evolver.useOldFormat(this, newFormat);
        return true;
    }
}