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;
27 final class StackedYangInstanceIdentifier extends YangInstanceIdentifier implements Cloneable {
28 private static final long serialVersionUID = 1L;
29 private static final Field PARENT_FIELD;
34 f = StackedYangInstanceIdentifier.class.getDeclaredField("parent");
35 } catch (NoSuchFieldException | SecurityException e) {
36 throw new ExceptionInInitializerError(e);
39 AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
40 f.setAccessible(true);
47 private final @NonNull YangInstanceIdentifier parent;
48 private final @NonNull PathArgument pathArgument;
50 private transient volatile StackedPathArguments pathArguments;
51 private transient volatile StackedReversePathArguments reversePathArguments;
53 StackedYangInstanceIdentifier(final YangInstanceIdentifier parent, final PathArgument pathArgument,
56 this.parent = requireNonNull(parent);
57 this.pathArgument = requireNonNull(pathArgument);
61 public StackedYangInstanceIdentifier clone() {
63 return (StackedYangInstanceIdentifier) super.clone();
64 } catch (CloneNotSupportedException e) {
65 throw new IllegalStateException("clone() should be supported", e);
70 public @NonNull YangInstanceIdentifier getParent() {
75 public YangInstanceIdentifier coerceParent() {
80 public YangInstanceIdentifier getAncestor(final int depth) {
81 checkArgument(depth >= 0, "Steps cannot be negative");
83 // Calculate how far up our FixedYangInstanceIdentifier ancestor is
85 YangInstanceIdentifier wlk = getParent();
86 while (wlk instanceof StackedYangInstanceIdentifier) {
87 wlk = wlk.getParent();
91 // Guaranteed to come from FixedYangInstanceIdentifier
92 final int fixedDepth = wlk.getPathArguments().size();
93 if (fixedDepth >= depth) {
94 return wlk.getAncestor(depth);
97 // Calculate our depth and check argument
98 final int ourDepth = stackedDepth + fixedDepth;
99 checkArgument(depth <= ourDepth, "Depth %s exceeds maximum depth %s", depth, ourDepth);
101 // Requested depth is covered by the stack, traverse up for specified number of steps
102 final int toWalk = ourDepth - depth;
103 YangInstanceIdentifier result = this;
104 for (int i = 0; i < toWalk; ++i) {
105 result = verifyNotNull(result.getParent());
112 public boolean isEmpty() {
117 public List<PathArgument> getPathArguments() {
118 StackedPathArguments ret = tryPathArguments();
120 final List<PathArgument> stack = new ArrayList<>();
121 YangInstanceIdentifier current = this;
123 verify(current instanceof StackedYangInstanceIdentifier);
124 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) current;
125 stack.add(stacked.getLastPathArgument());
126 current = stacked.getParent();
127 } while (current.tryPathArguments() == null);
129 ret = new StackedPathArguments(current, Lists.reverse(stack));
137 public List<PathArgument> getReversePathArguments() {
138 StackedReversePathArguments ret = tryReversePathArguments();
140 ret = new StackedReversePathArguments(this);
141 reversePathArguments = ret;
147 public PathArgument getLastPathArgument() {
152 StackedPathArguments tryPathArguments() {
153 return pathArguments;
157 StackedReversePathArguments tryReversePathArguments() {
158 return reversePathArguments;
162 YangInstanceIdentifier createRelativeIdentifier(final int skipFromRoot) {
163 // TODO: can we optimize this one?
164 return YangInstanceIdentifier.create(Iterables.skip(getPathArguments(), skipFromRoot));
168 boolean pathArgumentsEqual(final YangInstanceIdentifier other) {
169 if (other instanceof StackedYangInstanceIdentifier) {
170 final StackedYangInstanceIdentifier stacked = (StackedYangInstanceIdentifier) other;
171 return pathArgument.equals(stacked.pathArgument) && parent.equals(stacked.parent);
173 return super.pathArgumentsEqual(other);
176 private void readObject(final ObjectInputStream inputStream) throws IOException, ClassNotFoundException {
177 inputStream.defaultReadObject();
179 final FixedYangInstanceIdentifier p = (FixedYangInstanceIdentifier) inputStream.readObject();
181 PARENT_FIELD.set(this, p);
182 } catch (IllegalArgumentException | IllegalAccessException e) {
183 throw new IOException("Failed to set parent", e);
187 private void writeObject(final ObjectOutputStream outputStream) throws IOException {
188 outputStream.defaultWriteObject();
190 final FixedYangInstanceIdentifier p;
191 if (parent instanceof FixedYangInstanceIdentifier) {
192 p = (FixedYangInstanceIdentifier) parent;
194 p = FixedYangInstanceIdentifier.create(parent.getPathArguments(), parent.hashCode());
196 outputStream.writeObject(p);
200 public YangInstanceIdentifier toOptimized() {
201 return FixedYangInstanceIdentifier.create(getPathArguments());