/*
* 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.api.schema.tree.spi;
import com.google.common.base.Optional;
import java.util.Map;
import org.opendaylight.yangtools.util.MapAdaptor;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
/**
* A container node which may need further materialization. Materialized nodes are tracked in a map, which is consulted
* before creating a new child node from backing data. Since the child is immutable, we do not have to track it.
*/
final class LazyMutableContainerNode extends AbstractMutableContainerNode {
LazyMutableContainerNode(final AbstractContainerNode parent) {
this(parent, MapAdaptor.getDefaultInstance().initialSnapshot(1));
}
LazyMutableContainerNode(final AbstractContainerNode parent, final Map<PathArgument, TreeNode> children) {
super(parent, children);
}
@Override
public Optional<TreeNode> getChild(final PathArgument childId) {
final TreeNode modified = getModifiedChild(childId);
if (modified != null) {
return Optional.of(modified);
}
return Optional.fromNullable(AbstractContainerNode.getChildFromData(getData(), childId, getVersion()));
}
}