2 * Copyright (c) 2013 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.binding;
10 import com.google.common.base.Objects;
11 import com.google.common.base.Objects.ToStringHelper;
12 import com.google.common.base.Preconditions;
13 import com.google.common.collect.ImmutableCollection;
14 import com.google.common.collect.ImmutableList;
15 import com.google.common.collect.Iterables;
17 import java.io.IOException;
18 import java.io.Serializable;
19 import java.util.Collections;
20 import java.util.Iterator;
21 import java.util.List;
23 import org.opendaylight.yangtools.concepts.Builder;
24 import org.opendaylight.yangtools.concepts.Immutable;
25 import org.opendaylight.yangtools.concepts.Path;
26 import org.opendaylight.yangtools.util.HashCodeBuilder;
30 * This instance identifier uniquely identifies a specific DataObject in the data tree modeled by YANG.
32 * For Example let's say you were trying to refer to a node in inventory which was modeled in YANG as follows,
35 * module opendaylight-inventory {
41 * ext:context-instance "node-context";
50 * You could create an instance identifier as follows to get to a node with id "openflow:1"
52 * InstanceIdentifierBuilder.builder(Nodes.class).child(Node.class, new NodeKey(new NodeId("openflow:1")).build();
54 * This would be the same as using a path like so, "/nodes/node/openflow:1" to refer to the openflow:1 node
57 public class InstanceIdentifier<T extends DataObject> implements Path<InstanceIdentifier<? extends DataObject>>, Immutable, Serializable {
58 private static final long serialVersionUID = 1L;
60 * Protected to differentiate internal and external access. Internal
61 * access is required never to modify the contents. References passed
62 * to outside entities have to be wrapped in an unmodifiable view.
64 protected final Iterable<PathArgument> pathArguments;
65 private final Class<T> targetType;
66 private final boolean wildcarded;
67 private final int hash;
69 InstanceIdentifier(final Class<T> type, final Iterable<PathArgument> pathArguments, final boolean wildcarded, final int hash) {
70 this.pathArguments = Preconditions.checkNotNull(pathArguments);
71 this.targetType = Preconditions.checkNotNull(type);
72 this.wildcarded = wildcarded;
77 * Return the type of data which this InstanceIdentifier identifies.
81 public final Class<T> getTargetType() {
86 * Return the path argument chain which makes up this instance identifier.
88 * @return Path argument chain. Immutable and does not contain nulls.
90 public final Iterable<PathArgument> getPathArguments() {
91 return Iterables.unmodifiableIterable(pathArguments);
95 * Check whether an instance identifier contains any wildcards. A wildcard
96 * is an path argument which has a null key.
98 * @return @true if any of the path arguments has a null key.
100 public final boolean isWildcarded() {
105 public final int hashCode() {
110 public final boolean equals(final Object obj) {
117 if (getClass() != obj.getClass()) {
121 final InstanceIdentifier<?> other = (InstanceIdentifier<?>) obj;
122 if (pathArguments == other.pathArguments) {
127 * We could now just go and compare the pathArguments, but that
128 * can be potentially expensive. Let's try to avoid that by
129 * checking various things that we have cached from pathArguments
130 * and trying to prove the identifiers are *not* equal.
132 if (hash != other.hash) {
135 if (wildcarded != other.wildcarded) {
138 if (targetType != other.targetType) {
141 if (fastNonEqual(other)) {
145 // Everything checks out so far, so we have to do a full equals
146 return Iterables.elementsEqual(pathArguments, other.pathArguments);
150 * Perform class-specific fast checks for non-equality. This allows
151 * subclasses to avoid iterating over the pathArguments by performing
152 * quick checks on their specific fields.
154 * @param other The other identifier, guaranteed to be the same class
155 * @return @true if the other identifier cannot be equal to this one.
157 protected boolean fastNonEqual(final InstanceIdentifier<?> other) {
162 public final String toString() {
163 return addToStringAttributes(Objects.toStringHelper(this)).toString();
167 * Add class-specific toString attributes.
169 * @param toStringHelper ToStringHelper instance
170 * @return ToStringHelper instance which was passed in
172 protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
173 return toStringHelper.add("targetType", targetType).add("path", Iterables.toString(getPathArguments()));
177 * Return an instance identifier trimmed at the first occurrence of a
178 * specific component type.
180 * For example let's say an instance identifier was built like so,
182 * identifier = InstanceIdentifierBuilder.builder(Nodes.class).child(Node.class, new NodeKey(new NodeId("openflow:1")).build();
185 * And you wanted to obtain the Instance identifier which represented Nodes you would do it like so,
188 * identifier.firstIdentifierOf(Nodes.class)
191 * @param type component type
192 * @return trimmed instance identifier, or null if the component type
195 public final <I extends DataObject> InstanceIdentifier<I> firstIdentifierOf(final Class<I> type) {
197 for (final PathArgument a : getPathArguments()) {
198 if (type.equals(a.getType())) {
199 @SuppressWarnings("unchecked")
200 final InstanceIdentifier<I> ret = (InstanceIdentifier<I>) internalCreate(Iterables.limit(getPathArguments(), i));
211 * Return the key associated with the first component of specified type in
214 * @param listItem component type
215 * @param listKey component key type
216 * @return key associated with the component, or null if the component type
219 public final <N extends Identifiable<K> & DataObject, K extends Identifier<N>> K firstKeyOf(final Class<N> listItem, final Class<K> listKey) {
220 for (final PathArgument i : getPathArguments()) {
221 if (listItem.equals(i.getType())) {
222 @SuppressWarnings("unchecked")
223 final K ret = ((IdentifiableItem<N, K>)i).getKey();
232 * Check whether an identifier is contained in this identifier. This is a strict subtree check, which requires all
233 * PathArguments to match exactly, e.g.
236 * The contains method checks if the other identifier is fully contained within the current identifier. It does this
237 * by looking at only the types of the path arguments and not by comparing the path arguments themselves.
239 * To illustrate here is an example which explains the working of this API.
241 * Let's say you have two instance identifiers as follows,
243 * this = /nodes/node/openflow:1
244 * other = /nodes/node/openflow:2
246 * then this.contains(other) will return false.
252 public final boolean contains(final InstanceIdentifier<? extends DataObject> other) {
253 Preconditions.checkNotNull(other, "other should not be null");
255 final Iterator<?> lit = pathArguments.iterator();
256 final Iterator<?> oit = other.pathArguments.iterator();
258 while (lit.hasNext()) {
259 if (!oit.hasNext()) {
263 if (!lit.next().equals(oit.next())) {
272 * Check whether this instance identifier contains the other identifier after wildcard expansion. This is similar
273 * to {@link #contains(InstanceIdentifier)}, with the exception that a wildcards are assumed to match the their
274 * non-wildcarded PathArgument counterpart.
276 * @param other Identifier which should be checked for inclusion.
277 * @return @true if this identifier contains the other object
279 public final boolean containsWildcarded(final InstanceIdentifier<?> other) {
280 Preconditions.checkNotNull(other, "other should not be null");
282 final Iterator<PathArgument> lit = pathArguments.iterator();
283 final Iterator<PathArgument> oit = other.pathArguments.iterator();
285 while (lit.hasNext()) {
286 if (!oit.hasNext()) {
290 final PathArgument la = lit.next();
291 final PathArgument oa = oit.next();
293 if (!la.getType().equals(oa.getType())) {
296 if (la instanceof IdentifiableItem<?, ?> && oa instanceof IdentifiableItem<?, ?> && !la.equals(oa)) {
305 * Create a builder rooted at this key.
307 * @return A builder instance
309 public InstanceIdentifierBuilder<T> builder() {
310 return new InstanceIdentifierBuilderImpl<T>(new Item<T>(targetType), pathArguments, hash, isWildcarded());
313 private InstanceIdentifier<?> childIdentifier(final PathArgument arg) {
314 return trustedCreate(arg, Iterables.concat(pathArguments, Collections.singleton(arg)), HashCodeBuilder.nextHashCode(hash, arg), isWildcarded());
317 @SuppressWarnings("unchecked")
318 public final <N extends ChildOf<? super T>> InstanceIdentifier<N> child(final Class<N> container) {
319 final PathArgument arg = new Item<>(container);
320 return (InstanceIdentifier<N>) childIdentifier(arg);
323 @SuppressWarnings("unchecked")
324 public final <N extends Identifiable<K> & ChildOf<? super T>, K extends Identifier<N>> KeyedInstanceIdentifier<N, K> child(
325 final Class<N> listItem, final K listKey) {
326 final PathArgument arg = new IdentifiableItem<>(listItem, listKey);
327 return (KeyedInstanceIdentifier<N, K>) childIdentifier(arg);
330 @SuppressWarnings("unchecked")
331 public final <N extends DataObject & Augmentation<? super T>> InstanceIdentifier<N> augmentation(
332 final Class<N> container) {
333 final PathArgument arg = new Item<>(container);
334 return (InstanceIdentifier<N>) childIdentifier(arg);
338 private List<PathArgument> legacyCache;
341 * @deprecated Use {@link #getPathArguments()} instead.
344 public final List<PathArgument> getPath() {
345 if (legacyCache == null) {
346 legacyCache = ImmutableList.<PathArgument>copyOf(getPathArguments());
353 * Create a new InstanceIdentifierBuilder given a base InstanceIdentifier
359 * @deprecated Use {@link #builder()} instead.
362 public static <T extends DataObject> InstanceIdentifierBuilder<T> builder(final InstanceIdentifier<T> base) {
363 return base.builder();
367 * Create an InstanceIdentifierBuilder for a specific type of InstanceIdentifier as specified by container
373 public static <T extends ChildOf<? extends DataRoot>> InstanceIdentifierBuilder<T> builder(final Class<T> container) {
374 return new InstanceIdentifierBuilderImpl<T>().addNode(container);
378 * Create an InstanceIdentifierBuilder for a specific type of InstanceIdentifier which represents an IdentifiableItem
386 public static <N extends Identifiable<K> & ChildOf<? extends DataRoot>, K extends Identifier<N>> InstanceIdentifierBuilder<N> builder(
387 final Class<N> listItem, final K listKey) {
388 return new InstanceIdentifierBuilderImpl<N>().addNode(listItem, listKey);
392 * Create an instance identifier for a very specific object type. This method
393 * implements {@link #create(Iterable)} semantics, except it is used by internal
394 * callers, which have assured that the argument is an immutable Iterable.
397 * @param pathArguments The path to a specific node in the data tree
398 * @return InstanceIdentifier instance
399 * @throws IllegalArgumentException if pathArguments is empty or
400 * contains a null element.
402 private static InstanceIdentifier<?> internalCreate(final Iterable<PathArgument> pathArguments) {
403 final Iterator<? extends PathArgument> it = Preconditions.checkNotNull(pathArguments, "pathArguments may not be null").iterator();
404 final HashCodeBuilder<PathArgument> hashBuilder = new HashCodeBuilder<>();
405 boolean wildcard = false;
406 PathArgument a = null;
408 while (it.hasNext()) {
410 Preconditions.checkArgument(a != null, "pathArguments may not contain null elements");
412 // TODO: sanity check ChildOf<>;
413 hashBuilder.addArgument(a);
415 if (Identifiable.class.isAssignableFrom(a.getType()) && !(a instanceof IdentifiableItem<?, ?>)) {
419 Preconditions.checkArgument(a != null, "pathArguments may not be empty");
421 return trustedCreate(a, pathArguments, hashBuilder.toInstance(), wildcard);
425 * Create an instance identifier for a very specific object type.
429 * List<PathArgument> path = Arrays.asList(new Item(Nodes.class))
430 * new InstanceIdentifier(path);
433 * @param pathArguments The path to a specific node in the data tree
434 * @return InstanceIdentifier instance
435 * @throws IllegalArgumentException if pathArguments is empty or
436 * contains a null element.
438 public static InstanceIdentifier<?> create(final Iterable<? extends PathArgument> pathArguments) {
439 if (pathArguments instanceof ImmutableCollection<?>) {
440 @SuppressWarnings("unchecked")
441 final Iterable<PathArgument> immutableArguments = (Iterable<PathArgument>) pathArguments;
442 return internalCreate(immutableArguments);
444 return internalCreate(ImmutableList.copyOf(pathArguments));
449 * Create an instance identifier for a very specific object type.
453 * new InstanceIdentifier(Nodes.class)
455 * would create an InstanceIdentifier for an object of type Nodes
457 * @param type The type of the object which this instance identifier represents
458 * @return InstanceIdentifier instance
460 @SuppressWarnings("unchecked")
461 public static <T extends DataObject> InstanceIdentifier<T> create(final Class<T> type) {
462 return (InstanceIdentifier<T>) create(Collections.<PathArgument> singletonList(new Item<>(type)));
466 * Return the key associated with the last component of the specified identifier.
468 * @param id instance identifier
469 * @return key associated with the last component
471 public static <N extends Identifiable<K> & DataObject, K extends Identifier<N>> K keyOf(final InstanceIdentifier<N> id) {
472 @SuppressWarnings("unchecked")
473 final K ret = ((KeyedInstanceIdentifier<N, K>)id).getKey();
477 @SuppressWarnings({ "unchecked", "rawtypes" })
478 static InstanceIdentifier<?> trustedCreate(final PathArgument arg, final Iterable<PathArgument> pathArguments, final int hash, boolean wildcarded) {
479 if (Identifiable.class.isAssignableFrom(arg.getType()) && !(wildcarded)) {
480 Identifier<?> key = null;
481 if (arg instanceof IdentifiableItem<?, ?>) {
482 key = ((IdentifiableItem<?, ?>)arg).key;
487 return new KeyedInstanceIdentifier(arg.getType(), pathArguments, wildcarded, hash, key);
489 return new InstanceIdentifier(arg.getType(), pathArguments, wildcarded, hash);
494 * Path argument of {@link InstanceIdentifier}.
496 * Interface which implementations are used as path components of the
497 * path in overall data tree.
499 public interface PathArgument extends Comparable<PathArgument> {
500 Class<? extends DataObject> getType();
503 private static abstract class AbstractPathArgument<T extends DataObject> implements PathArgument, Serializable {
504 private static final long serialVersionUID = 1L;
505 private final Class<T> type;
507 protected AbstractPathArgument(final Class<T> type) {
508 this.type = Preconditions.checkNotNull(type, "Type may not be null.");
512 public final Class<T> getType() {
517 public int hashCode() {
518 return type.hashCode();
522 public boolean equals(final Object obj) {
529 if (getClass() != obj.getClass()) {
532 final AbstractPathArgument<?> other = (AbstractPathArgument<?>) obj;
533 return type.equals(other.type);
537 public int compareTo(final PathArgument arg) {
538 return type.getCanonicalName().compareTo(arg.getType().getCanonicalName());
543 * An Item represents an object that probably is only one of it's kind. For example a Nodes object is only one of
544 * a kind. In YANG terms this would probably represent a container.
548 public static final class Item<T extends DataObject> extends AbstractPathArgument<T> {
549 private static final long serialVersionUID = 1L;
551 public Item(final Class<T> type) {
556 public String toString() {
557 return getType().getName();
562 * An IdentifiableItem represents a object that is usually present in a collection and can be identified uniquely
563 * by a key. In YANG terms this would probably represent an item in a list.
565 * @param <I> An object that is identifiable by an identifier
566 * @param <T> The identifier of the object
568 public static final class IdentifiableItem<I extends Identifiable<T> & DataObject, T extends Identifier<I>> extends AbstractPathArgument<I> {
569 private static final long serialVersionUID = 1L;
572 public IdentifiableItem(final Class<I> type, final T key) {
574 this.key = Preconditions.checkNotNull(key, "Key may not be null.");
582 public boolean equals(final Object obj) {
583 return super.equals(obj) && key.equals(((IdentifiableItem<?, ?>) obj).getKey());
587 public int hashCode() {
588 return super.hashCode() * 31 + key.hashCode();
592 public String toString() {
593 return getType().getName() + "[key=" + key + "]";
598 public interface InstanceIdentifierBuilder<T extends DataObject> extends Builder<InstanceIdentifier<T>> {
600 * Append the specified container as a child of the current InstanceIdentifier referenced by the builder.
602 * This method should be used when you want to build an instance identifier by appending top-level
607 * InstanceIdentifier.builder().child(Nodes.class).build();
611 * NOTE :- The above example is only for illustration purposes InstanceIdentifier.builder() has been deprecated
612 * and should not be used. Use InstanceIdentifier.builder(Nodes.class) instead
618 <N extends ChildOf<? super T>> InstanceIdentifierBuilder<N> child(
622 * Append the specified listItem as a child of the current InstanceIdentifier referenced by the builder.
624 * This method should be used when you want to build an instance identifier by appending a specific list element
633 <N extends Identifiable<K> & ChildOf<? super T>, K extends Identifier<N>> InstanceIdentifierBuilder<N> child(
634 Class<N> listItem, K listKey);
637 * Build an identifier which refers to a specific augmentation of the current InstanceIdentifier referenced by
644 <N extends DataObject & Augmentation<? super T>> InstanceIdentifierBuilder<N> augmentation(
648 * Build the instance identifier.
652 InstanceIdentifier<T> build();
655 private void writeObject(final java.io.ObjectOutputStream out) throws IOException {
656 out.writeObject(targetType);
657 out.writeBoolean(wildcarded);
659 out.write(Iterables.size(pathArguments));
660 for (Object o : pathArguments) {
665 private void readObject(final java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
666 // TODO Auto-generated method stub