/*
 * 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 java.util.Collection;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodeContainer;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;

final class RecursiveReplaceCandidateNode extends AbstractDataTreeCandidateNode {
    private final NormalizedNodeContainer<?, PathArgument, NormalizedNode<?, ?>> oldData;

    public RecursiveReplaceCandidateNode(final NormalizedNodeContainer<?, PathArgument, NormalizedNode<?, ?>> oldData,
            final NormalizedNodeContainer<?, PathArgument, NormalizedNode<?, ?>> newData) {
        super(newData);
        this.oldData = Preconditions.checkNotNull(oldData);
    }

    @Override
    @Nonnull
    public ModificationType getModificationType() {
        return ModificationType.WRITE;
    }

    @Nonnull
    @Override
    public Optional<NormalizedNode<?, ?>> getDataAfter() {
        return super.dataOptional();
    }

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

    @Override
    public DataTreeCandidateNode getModifiedChild(final PathArgument identifier) {
        return deltaChild(oldData, getData(), identifier);
    }

    @Override
    @Nonnull
    public Collection<DataTreeCandidateNode> getChildNodes() {
        return deltaChildren(oldData, getData());
    }
}