/*
 * Copyright (c) 2015 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.yangtools.yang.data.impl.schema.tree;

import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;

final class ReplaceLeafCandidateNode extends AbstractWriteCandidate {
    private final NormalizedNode<?, ?> oldData;

    ReplaceLeafCandidateNode(final NormalizedNode<?, ?> oldData, final NormalizedNode<?, ?> newData) {
        super(newData);
        this.oldData = Preconditions.checkNotNull(oldData);
    }

    @Nonnull
    @Override
    public Optional<NormalizedNode<?, ?>> getDataBefore() {
        return Optional.of(oldData);
    }
}