2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
3 * This program and the accompanying materials are made available under the
4 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
5 * and is available at http://www.eclipse.org/legal/epl-v10.html
7 package org.opendaylight.yangtools.yang.model.api;
11 import com.google.common.base.Optional;
14 * AugmentationSchema represents augment definition. The "augment" statement
15 * allows a module or submodule to add to the schema tree defined in an external
16 * module, or the current module and its submodules, and to add to the nodes
17 * from a grouping in a "uses" statement.
19 public interface AugmentationSchema extends DataNodeContainer {
23 * Returns when statement
25 * If when condition is present node defined by the parent data definition
26 * statement is only valid when the returned XPath
27 * expression conceptually evaluates to "true"
28 * for a particular instance, then the node defined by the parent data
29 * definition statement is valid; otherwise, it is not.
31 * @return XPath condition
33 RevisionAwareXPath getWhenCondition();
36 * @return textual description of this augment.
38 String getDescription();
41 * @return textual cross-reference to an external document that provides
42 * additional information relevant to this node.
44 String getReference();
47 * @return actual status of this node.
52 * @return SchemaPath that identifies a node in the schema tree. This node
53 * is called the augment's target node. The target node MUST be
54 * either a container, list, choice, case, input, output, or
55 * notification node. It is augmented with the nodes defined as
56 * child nodes of this AugmentationSchema.
58 SchemaPath getTargetPath();
61 * @return collection of all unknown nodes defined in this augmentation
63 List<UnknownSchemaNode> getUnknownSchemaNodes();
66 * Returns Augmentation Definition from which this augmentation is derived
67 * if augmentation was added transitively via augmented uses.
69 * @return ugmentation Definition from which this augmentation is derived
70 * if augmentation was added transitively via augmented uses.
72 Optional<AugmentationSchema> getOriginalDefinition();