package org.opendaylight.controller.md.sal.dom.store.impl.tree.data;

import org.opendaylight.controller.md.sal.dom.store.impl.tree.DataTreeFactory;
import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier.NodeIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;

/**
 * A factory for creating in-memory data trees.
 */
public final class InMemoryDataTreeFactory implements DataTreeFactory {
	private static final InMemoryDataTreeFactory INSTANCE = new InMemoryDataTreeFactory();

	private InMemoryDataTreeFactory() {
		// Never instantiated externally
	}

	@Override
	public InMemoryDataTree create() {
		final NodeIdentifier root = new NodeIdentifier(SchemaContext.NAME);
		final NormalizedNode<?, ?> data = Builders.containerBuilder().withNodeIdentifier(root).build();

		return new InMemoryDataTree(StoreMetadataNode.createEmpty(data), null);
	}

	/**
	 * Get an instance of this factory. This method cannot fail.
	 *
	 * @return Data tree factory instance.
	 */
	public static final InMemoryDataTreeFactory getInstance() {
		return INSTANCE;
	}
}