2 * Copyright (c) 2015 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.api;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Verify.verify;
12 import static java.util.Objects.requireNonNull;
14 import com.google.common.collect.Iterables;
15 import com.google.common.collect.Lists;
16 import java.io.IOException;
17 import java.io.ObjectInputStream;
18 import java.io.ObjectOutputStream;
19 import java.lang.reflect.Field;
20 import java.security.AccessController;
21 import java.security.PrivilegedAction;
22 import java.util.ArrayList;
23 import java.util.List;
24 import org.eclipse.jdt.annotation.NonNull;
26 final class StackedYangInstanceIdentifier extends YangInstanceIdentifier implements Cloneable {
27 private static final long serialVersionUID = 1L;
28 private static final Field PARENT_FIELD;
33 f = StackedYangInstanceIdentifier.class.getDeclaredField("parent");
34 } catch (NoSuchFieldException | SecurityException e) {
35 throw new ExceptionInInitializerError(e);
38 AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
39 f.setAccessible(true);
46 private final @NonNull YangInstanceIdentifier parent;
47 private final @NonNull PathArgument pathArgument;
49 private transient volatile StackedPathArguments pathArguments;
50 private transient volatile StackedReversePathArguments reversePathArguments;
52 StackedYangInstanceIdentifier(final YangInstanceIdentifier parent, final PathArgument pathArgument,
55 this.parent = requireNonNull(parent);
56 this.pathArgument = requireNonNull(pathArgument);
60 public StackedYangInstanceIdentifier clone() {
62 return (StackedYangInstanceIdentifier) super.clone();
63 } catch (CloneNotSupportedException e) {
64 throw new IllegalStateException("clone() should be supported", e);
69 public @NonNull YangInstanceIdentifier getParent() {
74 public YangInstanceIdentifier getAncestor(final int depth) {
75 checkArgument(depth >= 0, "Steps cannot be negative");
77 // Calculate how far up our FixedYangInstanceIdentifier ancestor is
79 YangInstanceIdentifier wlk = getParent();
80 while (wlk instanceof StackedYangInstanceIdentifier) {
81 wlk = wlk.getParent();
85 // Guaranteed to come from FixedYangInstanceIdentifier
86 final int fixedDepth = wlk.getPathArguments().size();
87 if (fixedDepth >= depth) {
88 return wlk.getAncestor(depth);
91 // Calculate our depth and check argument
92 final int ourDepth = stackedDepth + fixedDepth;
93 checkArgument(depth <= ourDepth, "Depth %s exceeds maximum depth %s", depth, ourDepth);
95 // Requested depth is covered by the stack, traverse up for specified number of steps
96 final int toWalk = ourDepth - depth;
97 YangInstanceIdentifier result = this;
98 for (int i = 0; i < toWalk; ++i) {
99 result = result.getParent();
106 public boolean isEmpty() {
111 public List<PathArgument> getPathArguments() {
112 StackedPathArguments ret = tryPathArguments();
114 final List<PathArgument> stack = new ArrayList<>();
115 YangInstanceIdentifier current = this;
117 verify(current instanceof StackedYangInstanceIdentifier);
118 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) current;
119 stack.add(stacked.getLastPathArgument());
120 current = stacked.getParent();
121 } while (current.tryPathArguments() == null);
123 ret = new StackedPathArguments(current, Lists.reverse(stack));
131 public List<PathArgument> getReversePathArguments() {
132 StackedReversePathArguments ret = tryReversePathArguments();
134 ret = new StackedReversePathArguments(this);
135 reversePathArguments = ret;
141 public PathArgument getLastPathArgument() {
146 StackedPathArguments tryPathArguments() {
147 return pathArguments;
151 StackedReversePathArguments tryReversePathArguments() {
152 return reversePathArguments;
156 YangInstanceIdentifier createRelativeIdentifier(final int skipFromRoot) {
157 // TODO: can we optimize this one?
158 return YangInstanceIdentifier.create(Iterables.skip(getPathArguments(), skipFromRoot));
162 boolean pathArgumentsEqual(final YangInstanceIdentifier other) {
163 if (other instanceof StackedYangInstanceIdentifier) {
164 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) other;
165 return pathArgument.equals(stacked.pathArgument) && parent.equals(stacked.parent);
167 return super.pathArgumentsEqual(other);
170 private void readObject(final ObjectInputStream inputStream) throws IOException, ClassNotFoundException {
171 inputStream.defaultReadObject();
173 final FixedYangInstanceIdentifier p = (FixedYangInstanceIdentifier) inputStream.readObject();
175 PARENT_FIELD.set(this, p);
176 } catch (IllegalArgumentException | IllegalAccessException e) {
177 throw new IOException("Failed to set parent", e);
181 private void writeObject(final ObjectOutputStream outputStream) throws IOException {
182 outputStream.defaultWriteObject();
184 final FixedYangInstanceIdentifier p;
185 if (parent instanceof FixedYangInstanceIdentifier) {
186 p = (FixedYangInstanceIdentifier) parent;
188 p = FixedYangInstanceIdentifier.create(parent.getPathArguments(), parent.hashCode());
190 outputStream.writeObject(p);
194 public YangInstanceIdentifier toOptimized() {
195 return FixedYangInstanceIdentifier.create(getPathArguments());