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 com.google.common.base.Verify.verifyNotNull;
13 import static java.util.Objects.requireNonNull;
15 import com.google.common.collect.Iterables;
16 import com.google.common.collect.Lists;
17 import java.io.IOException;
18 import java.io.ObjectInputStream;
19 import java.io.ObjectOutputStream;
20 import java.lang.reflect.Field;
21 import java.security.AccessController;
22 import java.security.PrivilegedAction;
23 import java.util.ArrayList;
24 import java.util.List;
25 import org.eclipse.jdt.annotation.NonNull;
26 import org.opendaylight.yangtools.util.HashCodeBuilder;
28 final class StackedYangInstanceIdentifier extends YangInstanceIdentifier implements Cloneable {
29 private static final long serialVersionUID = 1L;
30 private static final Field PARENT_FIELD;
35 f = StackedYangInstanceIdentifier.class.getDeclaredField("parent");
36 } catch (NoSuchFieldException | SecurityException e) {
37 throw new ExceptionInInitializerError(e);
40 AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
41 f.setAccessible(true);
48 private final @NonNull YangInstanceIdentifier parent;
49 private final @NonNull PathArgument pathArgument;
51 private transient volatile StackedPathArguments pathArguments;
52 private transient volatile StackedReversePathArguments reversePathArguments;
54 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 coerceParent() {
79 public YangInstanceIdentifier getAncestor(final int depth) {
80 checkArgument(depth >= 0, "Steps cannot be negative");
82 // Calculate how far up our FixedYangInstanceIdentifier ancestor is
84 YangInstanceIdentifier wlk = getParent();
85 while (wlk instanceof StackedYangInstanceIdentifier) {
86 wlk = wlk.getParent();
90 // Guaranteed to come from FixedYangInstanceIdentifier
91 final int fixedDepth = wlk.getPathArguments().size();
92 if (fixedDepth >= depth) {
93 return wlk.getAncestor(depth);
96 // Calculate our depth and check argument
97 final int ourDepth = stackedDepth + fixedDepth;
98 checkArgument(depth <= ourDepth, "Depth %s exceeds maximum depth %s", depth, ourDepth);
100 // Requested depth is covered by the stack, traverse up for specified number of steps
101 final int toWalk = ourDepth - depth;
102 YangInstanceIdentifier result = this;
103 for (int i = 0; i < toWalk; ++i) {
104 result = verifyNotNull(result.getParent());
111 public boolean isEmpty() {
116 public List<PathArgument> getPathArguments() {
117 StackedPathArguments ret = tryPathArguments();
119 final List<PathArgument> stack = new ArrayList<>();
120 YangInstanceIdentifier current = this;
122 verify(current instanceof StackedYangInstanceIdentifier);
123 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) current;
124 stack.add(stacked.getLastPathArgument());
125 current = stacked.getParent();
126 } while (current.tryPathArguments() == null);
128 pathArguments = ret = new StackedPathArguments(current, Lists.reverse(stack));
135 public List<PathArgument> getReversePathArguments() {
136 StackedReversePathArguments ret = tryReversePathArguments();
138 ret = new StackedReversePathArguments(this);
139 reversePathArguments = ret;
145 public PathArgument getLastPathArgument() {
150 StackedPathArguments tryPathArguments() {
151 return pathArguments;
155 StackedReversePathArguments tryReversePathArguments() {
156 return reversePathArguments;
160 YangInstanceIdentifier createRelativeIdentifier(final int skipFromRoot) {
161 // TODO: can we optimize this one?
162 return YangInstanceIdentifier.create(Iterables.skip(getPathArguments(), skipFromRoot));
166 int computeHashCode() {
167 return HashCodeBuilder.nextHashCode(parent.hashCode(), pathArgument);
171 boolean pathArgumentsEqual(final YangInstanceIdentifier other) {
172 if (other instanceof StackedYangInstanceIdentifier) {
173 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) other;
174 return pathArgument.equals(stacked.pathArgument) && parent.equals(stacked.parent);
176 return super.pathArgumentsEqual(other);
179 private void readObject(final ObjectInputStream inputStream) throws IOException, ClassNotFoundException {
180 inputStream.defaultReadObject();
182 final FixedYangInstanceIdentifier p = (FixedYangInstanceIdentifier) inputStream.readObject();
184 PARENT_FIELD.set(this, p);
185 } catch (IllegalArgumentException | IllegalAccessException e) {
186 throw new IOException("Failed to set parent", e);
190 private void writeObject(final ObjectOutputStream outputStream) throws IOException {
191 outputStream.defaultWriteObject();
193 final FixedYangInstanceIdentifier p;
194 if (parent instanceof FixedYangInstanceIdentifier) {
195 p = (FixedYangInstanceIdentifier) parent;
197 p = FixedYangInstanceIdentifier.of(parent.getPathArguments());
199 outputStream.writeObject(p);
203 public YangInstanceIdentifier toOptimized() {
204 return FixedYangInstanceIdentifier.create(getPathArguments());