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 javax.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 YangInstanceIdentifier parent;
47 private final 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 YangInstanceIdentifier getParent() {
75 public YangInstanceIdentifier getAncestor(final int depth) {
76 checkArgument(depth >= 0, "Steps cannot be negative");
78 // Calculate how far up our FixedYangInstanceIdentifier ancestor is
80 YangInstanceIdentifier wlk = getParent();
81 while (wlk instanceof StackedYangInstanceIdentifier) {
82 wlk = wlk.getParent();
86 // Guaranteed to come from FixedYangInstanceIdentifier
87 final int fixedDepth = wlk.getPathArguments().size();
88 if (fixedDepth >= depth) {
89 return wlk.getAncestor(depth);
92 // Calculate our depth and check argument
93 final int ourDepth = stackedDepth + fixedDepth;
94 checkArgument(depth <= ourDepth, "Depth %s exceeds maximum depth %s", depth, ourDepth);
96 // Requested depth is covered by the stack, traverse up for specified number of steps
97 final int toWalk = ourDepth - depth;
98 YangInstanceIdentifier result = this;
99 for (int i = 0; i < toWalk; ++i) {
100 result = result.getParent();
107 public boolean isEmpty() {
112 public List<PathArgument> getPathArguments() {
113 StackedPathArguments ret = tryPathArguments();
115 final List<PathArgument> stack = new ArrayList<>();
116 YangInstanceIdentifier current = this;
118 verify(current instanceof StackedYangInstanceIdentifier);
119 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) current;
120 stack.add(stacked.getLastPathArgument());
121 current = stacked.getParent();
122 } while (current.tryPathArguments() == null);
124 ret = new StackedPathArguments(current, Lists.reverse(stack));
132 public List<PathArgument> getReversePathArguments() {
133 StackedReversePathArguments ret = tryReversePathArguments();
135 ret = new StackedReversePathArguments(this);
136 reversePathArguments = ret;
142 public PathArgument getLastPathArgument() {
148 StackedPathArguments tryPathArguments() {
149 return pathArguments;
154 StackedReversePathArguments tryReversePathArguments() {
155 return reversePathArguments;
160 YangInstanceIdentifier createRelativeIdentifier(final int skipFromRoot) {
161 // TODO: can we optimize this one?
162 return YangInstanceIdentifier.create(Iterables.skip(getPathArguments(), skipFromRoot));
166 boolean pathArgumentsEqual(final YangInstanceIdentifier other) {
167 if (other instanceof StackedYangInstanceIdentifier) {
168 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) other;
169 return pathArgument.equals(stacked.pathArgument) && parent.equals(stacked.parent);
171 return super.pathArgumentsEqual(other);
174 private void readObject(final ObjectInputStream inputStream) throws IOException, ClassNotFoundException {
175 inputStream.defaultReadObject();
177 final FixedYangInstanceIdentifier p = (FixedYangInstanceIdentifier) inputStream.readObject();
179 PARENT_FIELD.set(this, p);
180 } catch (IllegalArgumentException | IllegalAccessException e) {
181 throw new IOException("Failed to set parent", e);
185 private void writeObject(final ObjectOutputStream outputStream) throws IOException {
186 outputStream.defaultWriteObject();
188 final FixedYangInstanceIdentifier p;
189 if (parent instanceof FixedYangInstanceIdentifier) {
190 p = (FixedYangInstanceIdentifier) parent;
192 p = FixedYangInstanceIdentifier.create(parent.getPathArguments(), parent.hashCode());
194 outputStream.writeObject(p);
198 public YangInstanceIdentifier toOptimized() {
199 return FixedYangInstanceIdentifier.create(getPathArguments());