/*
 * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.cluster.access.commands;

import com.google.common.annotations.Beta;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import org.opendaylight.controller.cluster.access.ABIVersion;
import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;

/**
 * Successful reply to an {@link ReadTransactionRequest}. It indicates presence of requested data via {@link #getData()}.
 *
 * @author Robert Varga
 */
@Beta
public final class ReadTransactionSuccess extends TransactionSuccess<ReadTransactionSuccess> {
    private static final long serialVersionUID = 1L;
    private final Optional<NormalizedNode<?, ?>> data;

    public ReadTransactionSuccess(final TransactionIdentifier identifier, final long sequence,
            final Optional<NormalizedNode<?, ?>> data) {
        this(identifier, sequence, 0, data);
    }

    ReadTransactionSuccess(final TransactionIdentifier identifier, final long sequence, final long retry,
            final Optional<NormalizedNode<?, ?>> data) {
        super(identifier, sequence, retry);
        this.data = Preconditions.checkNotNull(data);
    }

    public Optional<NormalizedNode<?, ?>> getData() {
        return data;
    }

    @Override
    protected AbstractTransactionSuccessProxy<ReadTransactionSuccess> externalizableProxy(final ABIVersion version) {
        return new ReadTransactionSuccessProxyV1(this);
    }

    @Override
    protected ReadTransactionSuccess cloneAsVersion(final ABIVersion version) {
        return this;
    }
}