2 * Copyright (c) 2015, 2016 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.impl.schema.tree;
10 import static com.google.common.base.Verify.verifyNotNull;
11 import static java.util.Objects.requireNonNull;
13 import com.google.common.collect.Collections2;
14 import com.google.common.collect.ImmutableList;
15 import java.util.Collection;
16 import java.util.Optional;
17 import org.eclipse.jdt.annotation.Nullable;
18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
19 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodeContainer;
21 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
22 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNodes;
23 import org.opendaylight.yangtools.yang.data.api.schema.tree.ModificationType;
24 import org.opendaylight.yangtools.yang.data.api.schema.tree.spi.TreeNode;
26 abstract class AbstractModifiedNodeBasedCandidateNode implements DataTreeCandidateNode {
27 private final ModifiedNode mod;
28 private final TreeNode newMeta;
29 private final TreeNode oldMeta;
31 protected AbstractModifiedNodeBasedCandidateNode(final ModifiedNode mod, final TreeNode oldMeta,
32 final TreeNode newMeta) {
33 this.newMeta = newMeta;
34 this.oldMeta = oldMeta;
35 this.mod = requireNonNull(mod);
38 protected final ModifiedNode getMod() {
42 protected final TreeNode getNewMeta() {
46 protected final TreeNode getOldMeta() {
50 private static TreeNode childMeta(final TreeNode parent, final PathArgument id) {
51 return parent == null ? null : parent.getChild(id).orElse(null);
54 private static boolean canHaveChildren(final @Nullable TreeNode oldMeta, final @Nullable TreeNode newMeta) {
55 if (oldMeta != null) {
56 return oldMeta.getData() instanceof NormalizedNodeContainer;
58 if (newMeta != null) {
59 return newMeta.getData() instanceof NormalizedNodeContainer;
64 @SuppressWarnings("unchecked")
65 private static NormalizedNodeContainer<?, PathArgument, NormalizedNode<?, ?>> getContainer(
66 final @Nullable TreeNode meta) {
67 return meta == null ? null : (NormalizedNodeContainer<?, PathArgument, NormalizedNode<?, ?>>)meta.getData();
70 private ChildNode childNode(final ModifiedNode childMod) {
71 final PathArgument id = childMod.getIdentifier();
72 return new ChildNode(childMod, childMeta(oldMeta, id), childMeta(newMeta, id));
76 public Collection<DataTreeCandidateNode> getChildNodes() {
77 switch (mod.getModificationType()) {
80 case SUBTREE_MODIFIED:
81 return Collections2.transform(mod.getChildren(), this::childNode);
83 // Unmodified node, but we still need to resolve potential children. canHaveChildren returns
84 // false if both arguments are null.
85 if (!canHaveChildren(oldMeta, newMeta)) {
86 return ImmutableList.of();
89 return Collections2.transform(getContainer(newMeta != null ? newMeta : oldMeta).getValue(),
90 DataTreeCandidateNodes::unmodified);
93 // This is unusual, the user is requesting we follow into an otherwise-terminal node.
94 // We need to fudge things based on before/after data to correctly fake the expectations.
95 if (!canHaveChildren(oldMeta, newMeta)) {
96 return ImmutableList.of();
98 return DataTreeCandidateNodes.containerDelta(getContainer(oldMeta), getContainer(newMeta));
100 throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
105 public ModificationType getModificationType() {
106 return verifyNotNull(mod.getModificationType(), "Node %s does not have resolved modification type", mod);
109 private static Optional<NormalizedNode<?, ?>> optionalData(final TreeNode meta) {
110 return meta == null ? Optional.empty() : Optional.of(meta.getData());
114 public final Optional<NormalizedNode<?, ?>> getDataAfter() {
115 return optionalData(newMeta);
119 public final Optional<NormalizedNode<?, ?>> getDataBefore() {
120 return optionalData(oldMeta);
124 public final DataTreeCandidateNode getModifiedChild(final PathArgument identifier) {
125 switch (mod.getModificationType()) {
128 case SUBTREE_MODIFIED:
129 final Optional<ModifiedNode> childMod = mod.getChild(identifier);
130 if (childMod.isPresent()) {
131 return childNode(childMod.get());
135 if (!canHaveChildren(oldMeta, newMeta)) {
138 final Optional<NormalizedNode<?, ?>> maybeChild = getContainer(newMeta != null ? newMeta : oldMeta)
139 .getChild(identifier);
140 return maybeChild.isPresent() ? DataTreeCandidateNodes.unmodified(maybeChild.get()) : null;
143 if (!canHaveChildren(oldMeta, newMeta)) {
146 return DataTreeCandidateNodes.containerDelta(getContainer(oldMeta), getContainer(newMeta), identifier);
148 throw new IllegalArgumentException("Unhandled modification type " + mod.getModificationType());
152 private static final class ChildNode extends AbstractModifiedNodeBasedCandidateNode {
153 ChildNode(final ModifiedNode mod, final TreeNode oldMeta, final TreeNode newMeta) {
154 super(mod, oldMeta, newMeta);
158 public PathArgument getIdentifier() {
159 return getMod().getIdentifier();
164 public String toString() {
165 return this.getClass().getSimpleName() + "{mod = " + this.mod + ", oldMeta = " + this.oldMeta + ", newMeta = "
166 + this.newMeta + "}";