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.common;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.annotations.Beta;
13 import com.google.common.collect.Interner;
14 import com.google.common.collect.Interners;
15 import java.io.DataInput;
16 import java.io.DataOutput;
17 import java.io.IOException;
19 import java.net.URISyntaxException;
20 import java.util.Objects;
21 import java.util.Optional;
22 import java.util.regex.Matcher;
23 import java.util.regex.Pattern;
24 import org.checkerframework.checker.regex.qual.Regex;
25 import org.eclipse.jdt.annotation.NonNull;
26 import org.eclipse.jdt.annotation.Nullable;
29 * The QName from XML consists of local name of element and XML namespace, but for our use, we added module revision to
33 * In YANG context QName is full name of defined node, type, procedure or notification. QName consists of XML namespace,
34 * YANG model revision and local name of defined type. It is used to prevent name clashes between nodes with same local
35 * name, but from different schemas.
38 * The local name must conform to <a href="https://tools.ietf.org/html/rfc7950#section-6.2">RFC7950 Section 6.2</a>.
41 * <li><b>XMLNamespace</b> - {@link #getNamespace()} - the namespace assigned to the YANG module which
42 * defined element, type, procedure or notification.</li>
43 * <li><b>Revision</b> - {@link #getRevision()} - the revision of the YANG module which describes the
45 * <li><b>LocalName</b> - {@link #getLocalName()} - the YANG schema identifier which were defined for this
46 * node in the YANG module</li>
49 public final class QName extends AbstractQName implements Comparable<QName> {
50 private static final Interner<QName> INTERNER = Interners.newWeakInterner();
51 // Note: 5398411242927766414L is used for versions < 3.0.0 without writeReplace
52 private static final long serialVersionUID = 1L;
54 static final String QNAME_REVISION_DELIMITER = "?revision=";
55 static final String QNAME_LEFT_PARENTHESIS = "(";
56 static final String QNAME_RIGHT_PARENTHESIS = ")";
59 private static final String QNAME_STRING_FULL = "^\\((.+)\\?revision=(.+)\\)(.+)$";
60 private static final Pattern QNAME_PATTERN_FULL = Pattern.compile(QNAME_STRING_FULL);
63 private static final String QNAME_STRING_NO_REVISION = "^\\((.+)\\)(.+)$";
64 private static final Pattern QNAME_PATTERN_NO_REVISION = Pattern.compile(QNAME_STRING_NO_REVISION);
66 private final @NonNull QNameModule module;
67 private transient int hash = 0;
69 QName(final QNameModule module, final @NonNull String localName) {
71 this.module = requireNonNull(module);
78 * the namespace assigned to the YANG module
80 * YANG schema identifier
82 private QName(final URI namespace, final String localName) {
83 this(QNameModule.create(namespace), checkLocalName(localName));
86 public static @NonNull QName create(final String input) {
87 Matcher matcher = QNAME_PATTERN_FULL.matcher(input);
88 if (matcher.matches()) {
89 final String namespace = matcher.group(1);
90 final String revision = matcher.group(2);
91 final String localName = matcher.group(3);
92 return create(namespace, revision, localName);
94 matcher = QNAME_PATTERN_NO_REVISION.matcher(input);
95 if (matcher.matches()) {
96 final URI namespace = URI.create(matcher.group(1));
97 final String localName = matcher.group(2);
98 return new QName(namespace, localName);
100 throw new IllegalArgumentException("Invalid input: " + input);
103 public static @NonNull QName create(final QName base, final String localName) {
104 return create(base.getModule(), localName);
110 * @param qnameModule Namespace and revision enclosed as a QNameModule
111 * @param localName Local name part of QName. MUST NOT BE null.
112 * @return Instance of QName
113 * @throws NullPointerException if any argument is null
114 * @throws IllegalArgumentException if localName is not a valid YANG identifier
116 public static @NonNull QName create(final QNameModule qnameModule, final String localName) {
117 return new QName(requireNonNull(qnameModule, "module may not be null"), checkLocalName(localName));
123 * @param namespace Namespace of QName or null if namespace is undefined.
124 * @param revision Revision of namespace or null if revision is unspecified.
125 * @param localName Local name part of QName. MUST NOT BE null.
126 * @return Instance of QName
128 public static @NonNull QName create(final URI namespace, final @Nullable Revision revision,
129 final String localName) {
130 return create(QNameModule.create(namespace, revision), localName);
136 * @param namespace Namespace of QName or null if namespace is undefined.
137 * @param revision Revision of namespace.
138 * @param localName Local name part of QName. MUST NOT BE null.
139 * @return Instance of QName
141 public static @NonNull QName create(final URI namespace, final Optional<Revision> revision,
142 final String localName) {
143 return create(QNameModule.create(namespace, revision), localName);
149 * @param namespace Namespace of QName or null if namespace is undefined.
150 * @param revision Revision of namespace or null if revision is unspecified.
151 * @param localName Local name part of QName. MUST NOT BE null.
152 * @return Instance of QName
154 public static @NonNull QName create(final String namespace, final String localName, final Revision revision) {
155 return create(QNameModule.create(parseNamespace(namespace), revision), localName);
161 * @param namespace Namespace of QName, MUST NOT BE Null.
162 * @param revision Revision of namespace / YANG module. MUST NOT BE null, MUST BE in format {@code YYYY-mm-dd}.
163 * @param localName Local name part of QName. MUST NOT BE null.
164 * @return A new QName
165 * @throws NullPointerException If any of parameters is null.
166 * @throws IllegalArgumentException If {@code namespace} is not valid URI or {@code revision} does not conform
167 * to {@code YYYY-mm-dd}.
169 public static @NonNull QName create(final String namespace, final String revision, final String localName) {
170 return create(parseNamespace(namespace), Revision.of(revision), localName);
176 * @param namespace Namespace of QName, MUST NOT BE Null.
177 * @param localName Local name part of QName. MUST NOT BE null.
178 * @return A new QName
179 * @throws NullPointerException If any of parameters is null.
180 * @throws IllegalArgumentException If {@code namespace} is not valid URI.
182 public static @NonNull QName create(final String namespace, final String localName) {
183 return create(parseNamespace(namespace), localName);
189 * @param namespace Namespace of QName, MUST NOT BE null.
190 * @param localName Local name part of QName. MUST NOT BE null.
191 * @return A new QName
192 * @throws NullPointerException If any of parameters is null.
193 * @throws IllegalArgumentException If <code>namespace</code> is not valid URI.
195 public static @NonNull QName create(final URI namespace, final String localName) {
196 return new QName(namespace, localName);
200 * Read a QName from a DataInput. The format is expected to match the output format of {@link #writeTo(DataOutput)}.
202 * @param in DataInput to read
203 * @return A QName instance
204 * @throws IOException if I/O error occurs
206 public static @NonNull QName readFrom(final DataInput in) throws IOException {
207 final QNameModule module = QNameModule.readFrom(in);
208 return new QName(module, checkLocalName(in.readUTF()));
212 * Creates new QName composed of specified module and local name. This method does not perform lexical checking of
213 * localName, and it is the caller's responsibility to performs these checks.
216 * When in doubt, use {@link #create(QNameModule, String)} instead.
218 * @param qnameModule Namespace and revision enclosed as a QNameModule
219 * @param localName Local name part of QName, required to have been validated
220 * @return Instance of QName
221 * @throws NullPointerException if any of the arguments is null
224 public static @NonNull QName unsafeOf(final @NonNull QNameModule qnameModule, final @NonNull String localName) {
225 return new QName(qnameModule, localName);
229 * Get the module component of the QName.
231 * @return Module component
233 public @NonNull QNameModule getModule() {
238 * Returns XMLNamespace assigned to the YANG module.
240 * @return XMLNamespace assigned to the YANG module.
242 public @NonNull URI getNamespace() {
243 return module.getNamespace();
247 * Returns revision of the YANG module if the module has defined revision.
249 * @return revision of the YANG module if the module has defined revision.
251 public @NonNull Optional<Revision> getRevision() {
252 return module.getRevision();
256 public @NonNull QName intern() {
257 // We also want to make sure we keep the QNameModule cached
258 final QNameModule cacheMod = module.intern();
260 // Identity comparison is here on purpose, as we are deciding whether to potentially store 'qname' into the
261 // interner. It is important that it does not hold user-supplied reference (such a String instance from
262 // parsing of an XML document).
263 final QName template = cacheMod == module ? this : new QName(cacheMod, getLocalName().intern());
265 return INTERNER.intern(template);
269 public int hashCode() {
271 hash = Objects.hash(module, getLocalName());
277 * Compares the specified object with this list for equality. Returns {@code true} if and only if the specified
278 * object is also instance of {@link QName} and its {@link #getLocalName()}, {@link #getNamespace()} and
279 * {@link #getRevision()} are equals to same properties of this instance.
281 * @param obj the object to be compared for equality with this QName
282 * @return {@code true} if the specified object is equal to this QName
285 public boolean equals(final Object obj) {
289 if (!(obj instanceof QName)) {
292 final QName other = (QName) obj;
293 return Objects.equals(getLocalName(), other.getLocalName()) && module.equals(other.module);
296 private static @NonNull URI parseNamespace(final String namespace) {
298 return new URI(namespace);
299 } catch (final URISyntaxException ue) {
300 throw new IllegalArgumentException("Namespace '" + namespace + "' is not a valid URI", ue);
305 public @NonNull String toString() {
306 final StringBuilder sb = new StringBuilder().append(QNAME_LEFT_PARENTHESIS).append(getNamespace());
307 final Optional<Revision> rev = getRevision();
308 if (rev.isPresent()) {
309 sb.append(QNAME_REVISION_DELIMITER).append(rev.get());
311 return sb.append(QNAME_RIGHT_PARENTHESIS).append(getLocalName()).toString();
315 public @NonNull QName bindTo(final QNameModule namespace) {
316 return module.equals(namespace) ? this : super.bindTo(namespace);
320 * Returns a QName with the same namespace and local name, but with no revision. If this QName does not have
321 * a Revision, this object is returned.
323 * @return a QName with the same namespace and local name, but with no revision.
325 public @NonNull QName withoutRevision() {
326 final QNameModule newModule;
327 return (newModule = module.withoutRevision()) == module ? this : new QName(newModule, getLocalName());
331 * Formats {@link Revision} representing revision to format {@code YYYY-mm-dd}
334 * YANG Specification defines format for {@code revision<} as YYYY-mm-dd. This format for revision is reused across
335 * multiple places such as capabilities URI, YANG modules, etc.
337 * @param revision Date object to format
338 * @return String representation or null if the input was null.
340 public static @Nullable String formattedRevision(final Optional<Revision> revision) {
341 return revision.map(Revision::toString).orElse(null);
345 * Compares this QName to other, without comparing revision.
348 * Compares instance of this to other instance of QName and returns true if both instances have equal
349 * {@code localName} ({@link #getLocalName()}) and @{code namespace} ({@link #getNamespace()}).
351 * @param other Other QName. Must not be null.
352 * @return true if this instance and other have equals localName and namespace.
353 * @throws NullPointerException if {@code other} is null.
355 public boolean isEqualWithoutRevision(final QName other) {
356 return getLocalName().equals(other.getLocalName()) && Objects.equals(getNamespace(), other.getNamespace());
359 // FIXME: this comparison function looks odd. We are sorting first by local name and then by module? What is
360 // the impact on iteration order of SortedMap<QName, ?>?
362 @SuppressWarnings("checkstyle:parameterName")
363 public int compareTo(final QName o) {
364 // compare mandatory localName parameter
365 int result = getLocalName().compareTo(o.getLocalName());
369 return module.compareTo(o.module);
373 public void writeTo(final DataOutput out) throws IOException {
375 out.writeUTF(getLocalName());
379 Object writeReplace() {
380 return new QNv1(this);