2 * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.yangtools.yang.data.tree.impl;
10 import com.google.common.base.MoreObjects;
11 import com.google.common.base.MoreObjects.ToStringHelper;
12 import java.util.Optional;
13 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
14 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
15 import org.opendaylight.yangtools.yang.data.api.schema.tree.StoreTreeNode;
16 import org.opendaylight.yangtools.yang.data.tree.api.DataValidationFailedException;
17 import org.opendaylight.yangtools.yang.data.tree.impl.node.TreeNode;
18 import org.opendaylight.yangtools.yang.data.tree.impl.node.Version;
21 * An operation responsible for applying {@link ModifiedNode} on tree. The operation is a hierachical composite -
22 * the operation on top level node consists of suboperations on child nodes. This allows to walk operation hierarchy and
23 * invoke suboperations independently.
26 * <b>Implementation notes</b>
28 * <li>Implementations MUST expose all nested suboperations which operates on child nodes expose via
29 * {@link #findChildByArg(PathArgument)} method.</li>
30 * <li>Same suboperations SHOULD be used when invoked via {@link #apply(ModifiedNode, Optional, Version)},
32 * <li>There are exactly two base implementations:
34 * <li>{@link SchemaAwareApplyOperation}, which serves as the base class for stateful mutators -- directly
35 * impacting the layout and transitions of the {@link TreeNode} hierarchy.
36 * <li>{@link AbstractValidation}, which serves as the base class for stateless checks, which work purely on top
37 * of the {@link TreeNode} hierarchy. These are always overlaid on top of some other
38 * {@link ModificationApplyOperation}, ultimately leading to a {@link SchemaAwareApplyOperation}.
40 * This allows baseline invocations from {@link OperationWithModification} to be bimorphic in the first line of
45 abstract sealed class ModificationApplyOperation implements StoreTreeNode<ModificationApplyOperation>
46 permits AbstractValidation, SchemaAwareApplyOperation {
48 * Implementation of this operation must be stateless and must not change state of this object.
51 * NodeModification to be applied
53 * Store Metadata Node on which NodeModification should be
55 * @param version New subtree version of parent node
56 * @return new {@link TreeNode} if operation resulted in updating
57 * node, {@link Optional#absent()} if {@link ModifiedNode}
58 * resulted in deletion of this node.
59 * @throws IllegalArgumentException
60 * If it is not possible to apply Operation on provided Metadata
63 abstract Optional<? extends TreeNode> apply(ModifiedNode modification, Optional<? extends TreeNode> storeMeta,
67 * Checks if provided node modification could be applied to current metadata node.
69 * @param path Path to modification
70 * @param modification Modification
71 * @param current Metadata Node to which modification should be applied
72 * @param version Metadata version
73 * @throws DataValidationFailedException if the modification is not applicable
75 abstract void checkApplicable(ModificationPath path, NodeModification modification,
76 Optional<? extends TreeNode> current, Version version) throws DataValidationFailedException;
79 * Performs a quick structural verification of NodeModification, such as written values / types uses right
80 * structural elements.
82 * @param modification data to be verified.
83 * @throws IllegalArgumentException If provided NodeModification does not adhere to the
86 abstract void quickVerifyStructure(NormalizedNode modification);
89 * Performs a full structural verification of NodeModification, such as written values / types uses right
90 * structural elements. Unlike {@link #quickVerifyStructure(NormalizedNode)} this includes recursively checking
93 * @param modification data to be verified.
94 * @throws IllegalArgumentException If provided NodeModification does not adhere to the
97 abstract void fullVerifyStructure(NormalizedNode modification);
100 * Return the tracking policy for this node's children.
102 * @return Tracking policy, may not be null.
104 abstract ChildTrackingPolicy getChildPolicy();
107 * Stage a merge operation into a {@link ModifiedNode} such that it will be processed correctly by
108 * {@link #apply(ModifiedNode, Optional, Version)}. This method is the context which is introducing this operation,
109 * and so any overheads are charged to whoever is in control of the access pattern.
111 * @param modification Original modification node
112 * @param value Value which should be merge into the modification
113 * @param version Data version as carried in the containing {@link InMemoryDataTreeModification}
115 abstract void mergeIntoModifiedNode(ModifiedNode modification, NormalizedNode value, Version version);
120 * @return Reference to suboperation for specified tree node, {@code null} if suboperation is not supported for
121 * specified tree node.
124 public abstract ModificationApplyOperation childByArg(PathArgument arg);
126 abstract void recursivelyVerifyStructure(NormalizedNode value);
128 abstract ToStringHelper addToStringAttributes(ToStringHelper helper);
131 public final String toString() {
132 return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();