*/
package org.opendaylight.yangtools.yang.common;
-import static org.opendaylight.yangtools.yang.common.SimpleDateFormatUtil.getRevisionFormat;
-
+import static com.google.common.base.Preconditions.checkArgument;
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.base.CharMatcher;
+import com.google.common.collect.Interner;
+import com.google.common.collect.Interners;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
import java.io.Serializable;
import java.net.URI;
import java.net.URISyntaxException;
-import java.text.ParseException;
-import java.util.Date;
import java.util.Objects;
+import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
-
+import javax.annotation.RegEx;
+import org.eclipse.jdt.annotation.NonNull;
+import org.eclipse.jdt.annotation.Nullable;
+import org.opendaylight.yangtools.concepts.Identifier;
import org.opendaylight.yangtools.concepts.Immutable;
+import org.opendaylight.yangtools.concepts.WritableObject;
/**
- * The QName from XML consists of local name of element and XML namespace, but
- * for our use, we added module revision to it.
+ * The QName from XML consists of local name of element and XML namespace, but for our use, we added module revision to
+ * it.
+ *
+ * <p>
+ * In YANG context QName is full name of defined node, type, procedure or notification. QName consists of XML namespace,
+ * YANG model revision and local name of defined type. It is used to prevent name clashes between nodes with same local
+ * name, but from different schemas.
*
- * In YANG context QName is full name of defined node, type, procedure or
- * notification. QName consists of XML namespace, YANG model revision and local
- * name of defined type. It is used to prevent name clashes between nodes with
- * same local name, but from different schemas.
+ * <p>
+ * The local name must conform to <a href="https://tools.ietf.org/html/rfc7950#section-6.2">RFC7950 Section 6.2</a>.
*
* <ul>
* <li><b>XMLNamespace</b> - {@link #getNamespace()} - the namespace assigned to the YANG module which
* <li><b>LocalName</b> - {@link #getLocalName()} - the YANG schema identifier which were defined for this
* node in the YANG module</li>
* </ul>
- *
- * QName may also have <code>prefix</code> assigned, but prefix does not
- * affect equality and identity of two QNames and carry only information
- * which may be useful for serializers / deserializers.
- *
- *
*/
-public final class QName implements Immutable, Serializable, Comparable<QName> {
+public final class QName implements Immutable, Serializable, Comparable<QName>, Identifier, WritableObject {
+ private static final Interner<QName> INTERNER = Interners.newWeakInterner();
private static final long serialVersionUID = 5398411242927766414L;
static final String QNAME_REVISION_DELIMITER = "?revision=";
static final String QNAME_LEFT_PARENTHESIS = "(";
static final String QNAME_RIGHT_PARENTHESIS = ")";
- private static final Pattern QNAME_PATTERN_FULL = Pattern.compile("^\\((.+)\\" + QNAME_REVISION_DELIMITER
- + "(.+)\\)(.+)$");
- private static final Pattern QNAME_PATTERN_NO_REVISION = Pattern.compile("^\\((.+)\\)(.+)$");
- private static final Pattern QNAME_PATTERN_NO_NAMESPACE_NO_REVISION = Pattern.compile("^(.+)$");
+ @RegEx
+ private static final String QNAME_STRING_FULL = "^\\((.+)\\?revision=(.+)\\)(.+)$";
+ private static final Pattern QNAME_PATTERN_FULL = Pattern.compile(QNAME_STRING_FULL);
- private static final char[] ILLEGAL_CHARACTERS = new char[] { '?', '(', ')', '&' };
+ @RegEx
+ private static final String QNAME_STRING_NO_REVISION = "^\\((.+)\\)(.+)$";
+ private static final Pattern QNAME_PATTERN_NO_REVISION = Pattern.compile(QNAME_STRING_NO_REVISION);
- // Mandatory
- private final QNameModule module;
- // Mandatory
- private final String localName;
- // Nullable
- private final String prefix;
+ private static final CharMatcher IDENTIFIER_START =
+ CharMatcher.inRange('A', 'Z').or(CharMatcher.inRange('a', 'z').or(CharMatcher.is('_'))).precomputed();
+ private static final CharMatcher NOT_IDENTIFIER_PART =
+ IDENTIFIER_START.or(CharMatcher.inRange('0', '9')).or(CharMatcher.anyOf("-.")).negate().precomputed();
- private QName(final QNameModule module, final String prefix, final String localName) {
- this.localName = checkLocalName(localName);
- this.prefix = prefix;
- this.module = module;
- }
+ private final @NonNull QNameModule module;
+ private final @NonNull String localName;
+ private transient int hash = 0;
- /**
- * QName Constructor.
- *
- * @param namespace
- * the namespace assigned to the YANG module
- * @param revision
- * the revision of the YANG module
- * @param prefix
- * locally defined prefix assigned to local name
- * @param localName
- * YANG schema identifier
- *
- */
- public QName(final URI namespace, final Date revision, final String prefix, final String localName) {
- this(QNameModule.create(namespace, revision), prefix, localName);
+ private QName(final QNameModule module, final @NonNull String localName) {
+ this.module = requireNonNull(module);
+ this.localName = requireNonNull(localName);
}
/**
* @param localName
* YANG schema identifier
*/
- public QName(final URI namespace, final String localName) {
- this(namespace, null, "", localName);
+ private QName(final URI namespace, final String localName) {
+ this(QNameModule.create(namespace), checkLocalName(localName));
}
- private static String checkLocalName(final String localName) {
- if (localName == null) {
- throw new IllegalArgumentException("Parameter 'localName' may not be null.");
- }
- if (localName.length() == 0) {
- throw new IllegalArgumentException("Parameter 'localName' must be a non-empty string.");
- }
-
- for (char c : ILLEGAL_CHARACTERS) {
- if (localName.indexOf(c) != -1) {
- throw new IllegalArgumentException(String.format(
- "Parameter 'localName':'%s' contains illegal character '%s'", localName, c));
- }
- }
+ private static @NonNull String checkLocalName(final String localName) {
+ checkArgument(localName != null, "Parameter 'localName' may not be null.");
+ checkArgument(!localName.isEmpty(), "Parameter 'localName' must be a non-empty string.");
+ checkArgument(IDENTIFIER_START.matches(localName.charAt(0)) && NOT_IDENTIFIER_PART.indexIn(localName, 1) == -1,
+ "String '%s' is not a valid identifier", localName);
return localName;
}
- public static QName create(final String input) {
+ public static @NonNull QName create(final String input) {
Matcher matcher = QNAME_PATTERN_FULL.matcher(input);
if (matcher.matches()) {
- String namespace = matcher.group(1);
- String revision = matcher.group(2);
- String localName = matcher.group(3);
+ final String namespace = matcher.group(1);
+ final String revision = matcher.group(2);
+ final String localName = matcher.group(3);
return create(namespace, revision, localName);
}
matcher = QNAME_PATTERN_NO_REVISION.matcher(input);
if (matcher.matches()) {
- URI namespace = URI.create(matcher.group(1));
- String localName = matcher.group(2);
+ final URI namespace = URI.create(matcher.group(1));
+ final String localName = matcher.group(2);
return new QName(namespace, localName);
}
- matcher = QNAME_PATTERN_NO_NAMESPACE_NO_REVISION.matcher(input);
- if (matcher.matches()) {
- String localName = matcher.group(1);
- return new QName((URI) null, localName);
- }
- throw new IllegalArgumentException("Invalid input:" + input);
+ throw new IllegalArgumentException("Invalid input: " + input);
+ }
+
+ public static @NonNull QName create(final QName base, final String localName) {
+ return create(base.getModule(), localName);
+ }
+
+ /**
+ * Creates new QName.
+ *
+ * @param qnameModule
+ * Namespace and revision enclosed as a QNameModule
+ * @param localName
+ * Local name part of QName. MUST NOT BE null.
+ * @return Instance of QName
+ */
+ public static @NonNull QName create(final QNameModule qnameModule, final String localName) {
+ return new QName(requireNonNull(qnameModule, "module may not be null"), checkLocalName(localName));
+ }
+
+ /**
+ * Creates new QName.
+ *
+ * @param namespace Namespace of QName or null if namespace is undefined.
+ * @param revision Revision of namespace or null if revision is unspecified.
+ * @param localName Local name part of QName. MUST NOT BE null.
+ * @return Instance of QName
+ */
+ public static @NonNull QName create(final URI namespace, final @Nullable Revision revision,
+ final String localName) {
+ return create(QNameModule.create(namespace, revision), localName);
+ }
+
+ /**
+ * Creates new QName.
+ *
+ * @param namespace Namespace of QName or null if namespace is undefined.
+ * @param revision Revision of namespace.
+ * @param localName Local name part of QName. MUST NOT BE null.
+ * @return Instance of QName
+ */
+ public static @NonNull QName create(final URI namespace, final Optional<Revision> revision,
+ final String localName) {
+ return create(QNameModule.create(namespace, revision), localName);
+ }
+
+ /**
+ * Creates new QName.
+ *
+ * @param namespace Namespace of QName or null if namespace is undefined.
+ * @param revision Revision of namespace or null if revision is unspecified.
+ * @param localName Local name part of QName. MUST NOT BE null.
+ * @return Instance of QName
+ */
+ public static @NonNull QName create(final String namespace, final String localName, final Revision revision) {
+ return create(QNameModule.create(parseNamespace(namespace), revision), localName);
+ }
+
+ /**
+ * Creates new QName.
+ *
+ * @param namespace Namespace of QName, MUST NOT BE Null.
+ * @param revision Revision of namespace / YANG module. MUST NOT BE null, MUST BE in format {@code YYYY-mm-dd}.
+ * @param localName Local name part of QName. MUST NOT BE null.
+ * @return A new QName
+ * @throws NullPointerException If any of parameters is null.
+ * @throws IllegalArgumentException If {@code namespace} is not valid URI or {@code revision} does not conform
+ * to {@code YYYY-mm-dd}.
+ */
+ public static @NonNull QName create(final String namespace, final String revision, final String localName) {
+ return create(parseNamespace(namespace), Revision.of(revision), localName);
+ }
+
+ /**
+ * Creates new QName.
+ *
+ * @param namespace Namespace of QName, MUST NOT BE Null.
+ * @param localName Local name part of QName. MUST NOT BE null.
+ * @return A new QName
+ * @throws NullPointerException If any of parameters is null.
+ * @throws IllegalArgumentException If {@code namespace} is not valid URI.
+ */
+ public static @NonNull QName create(final String namespace, final String localName) {
+ return create(parseNamespace(namespace), localName);
+ }
+
+ /**
+ * Creates new QName.
+ *
+ * @param namespace Namespace of QName, MUST NOT BE null.
+ * @param localName Local name part of QName. MUST NOT BE null.
+ * @return A new QName
+ * @throws NullPointerException If any of parameters is null.
+ * @throws IllegalArgumentException If <code>namespace</code> is not valid URI.
+ */
+ public static @NonNull QName create(final URI namespace, final String localName) {
+ return new QName(namespace, localName);
+ }
+
+ /**
+ * Read a QName from a DataInput. The format is expected to match the output format of {@link #writeTo(DataOutput)}.
+ *
+ * @param in DataInput to read
+ * @return A QName instance
+ * @throws IOException if I/O error occurs
+ */
+ public static QName readFrom(final DataInput in) throws IOException {
+ final QNameModule module = QNameModule.readFrom(in);
+ return new QName(module, checkLocalName(in.readUTF()));
}
/**
*
* @return Module component
*/
- public QNameModule getModule() {
+ public @NonNull QNameModule getModule() {
return module;
}
*
* @return XMLNamespace assigned to the YANG module.
*/
- public URI getNamespace() {
+ public @NonNull URI getNamespace() {
return module.getNamespace();
}
/**
* Returns YANG schema identifier which were defined for this node in the
- * YANG module
+ * YANG module.
*
* @return YANG schema identifier which were defined for this node in the
* YANG module
*/
- public String getLocalName() {
+ public @NonNull String getLocalName() {
return localName;
}
/**
- * Returns revision of the YANG module if the module has defined revision,
- * otherwise returns <code>null</code>
+ * Returns revision of the YANG module if the module has defined revision.
*
- * @return revision of the YANG module if the module has defined revision,
- * otherwise returns <code>null</code>
+ * @return revision of the YANG module if the module has defined revision.
*/
- public Date getRevision() {
+ public @NonNull Optional<Revision> getRevision() {
return module.getRevision();
}
/**
- * Returns locally defined prefix assigned to local name
+ * Return an interned reference to a equivalent QName.
*
- * @return locally defined prefix assigned to local name
+ * @return Interned reference, or this object if it was interned.
*/
- public String getPrefix() {
- return prefix;
+ public @NonNull QName intern() {
+ // We also want to make sure we keep the QNameModule cached
+ final QNameModule cacheMod = module.intern();
+
+ // Identity comparison is here on purpose, as we are deciding whether to potentially store 'qname' into the
+ // interner. It is important that it does not hold user-supplied reference (such a String instance from
+ // parsing of an XML document).
+ final QName template = cacheMod == module ? this : new QName(cacheMod, localName.intern());
+
+ return INTERNER.intern(template);
}
@Override
public int hashCode() {
- final int prime = 31;
- int result = 1;
- result = prime * result + ((localName == null) ? 0 : localName.hashCode());
- result = prime * result + module.hashCode();
- return result;
+ if (hash == 0) {
+ hash = Objects.hash(module, localName);
+ }
+ return hash;
}
/**
- *
- * Compares the specified object with this list for equality. Returns
- * <tt>true</tt> if and only if the specified object is also instance of
- * {@link QName} and its {@link #getLocalName()}, {@link #getNamespace()} and
+ * Compares the specified object with this list for equality. Returns {@code true} if and only if the specified
+ * object is also instance of {@link QName} and its {@link #getLocalName()}, {@link #getNamespace()} and
* {@link #getRevision()} are equals to same properties of this instance.
*
- * @param o the object to be compared for equality with this QName
- * @return <tt>true</tt> if the specified object is equal to this QName
- *
+ * @param obj the object to be compared for equality with this QName
+ * @return {@code true} if the specified object is equal to this QName
*/
@Override
public boolean equals(final Object obj) {
return false;
}
final QName other = (QName) obj;
- if (localName == null) {
- if (other.localName != null) {
- return false;
- }
- } else if (!localName.equals(other.localName)) {
- return false;
- }
- return module.equals(other.module);
- }
-
- public static QName create(final QName base, final String localName) {
- return new QName(base.getModule(), base.getPrefix(), localName);
- }
-
- /**
- * Creates new QName.
- *
- * @param qnameModule
- * Namespace and revision enclosed as a QNameModule
- * @param prefix
- * Namespace prefix
- * @param localName
- * Local name part of QName. MUST NOT BE null.
- * @return Instance of QName
- */
- public static QName create(final QNameModule module, final String prefix, final String localName) {
- if (module == null) {
- throw new NullPointerException("module may not be null");
- }
- return new QName(module, prefix, localName);
- }
-
- /**
- * Creates new QName.
- *
- * @param qnameModule
- * Namespace and revision enclosed as a QNameModule
- * @param localName
- * Local name part of QName. MUST NOT BE null.
- * @return Instance of QName
- */
- public static QName create(final QNameModule qnameModule, final String localName) {
- return new QName(qnameModule, null, localName);
- }
-
- /**
- * Creates new QName.
- *
- * @param namespace
- * Namespace of QName or null if namespace is undefined.
- * @param revision
- * Revision of namespace or null if revision is unspecified.
- * @param localName
- * Local name part of QName. MUST NOT BE null.
- * @return Instance of QName
- */
- public static QName create(final URI namespace, final Date revision, final String localName) {
- return new QName(QNameModule.create(namespace, revision), null, localName);
+ return Objects.equals(localName, other.localName) && module.equals(other.module);
}
- /**
- *
- * Creates new QName.
- *
- * @param namespace
- * Namespace of QName, MUST NOT BE Null.
- * @param revision
- * Revision of namespace / YANG module. MUST NOT BE null, MUST BE
- * in format <code>YYYY-mm-dd</code>.
- * @param localName
- * Local name part of QName. MUST NOT BE null.
- * @return
- * @throws NullPointerException
- * If any of paramaters is null.
- * @throws IllegalArgumentException
- * If <code>namespace</code> is not valid URI or
- * <code>revision</code> is not according to format
- * <code>YYYY-mm-dd</code>.
- */
- public static QName create(final String namespace, final String revision, final String localName)
- throws IllegalArgumentException {
- final URI namespaceUri;
+ private static @NonNull URI parseNamespace(final String namespace) {
try {
- namespaceUri = new URI(namespace);
- } catch (URISyntaxException ue) {
- throw new IllegalArgumentException(String.format("Namespace '%s' is not a valid URI", namespace), ue);
+ return new URI(namespace);
+ } catch (final URISyntaxException ue) {
+ throw new IllegalArgumentException("Namespace '" + namespace + "' is not a valid URI", ue);
}
-
- Date revisionDate = parseRevision(revision);
- return create(namespaceUri, revisionDate, localName);
}
@Override
- public String toString() {
- StringBuilder sb = new StringBuilder();
+ public @NonNull String toString() {
+ final StringBuilder sb = new StringBuilder();
if (getNamespace() != null) {
- sb.append(QNAME_LEFT_PARENTHESIS + getNamespace());
+ sb.append(QNAME_LEFT_PARENTHESIS).append(getNamespace());
- if (getFormattedRevision() != null) {
- sb.append(QNAME_REVISION_DELIMITER + getFormattedRevision());
+ final Optional<Revision> rev = getRevision();
+ if (rev.isPresent()) {
+ sb.append(QNAME_REVISION_DELIMITER).append(rev.get());
}
sb.append(QNAME_RIGHT_PARENTHESIS);
}
- sb.append(localName);
- return sb.toString();
+ return sb.append(localName).toString();
}
/**
- * Return string representation of revision in format
- * <code>YYYY-mm-dd</code>
- *
- * YANG Specification defines format for <code>revision</code> as
- * YYYY-mm-dd. This format for revision is reused accross multiple places
- * such as capabilities URI, YANG modules, etc.
+ * Returns a QName with the specified QNameModule and the same localname as this one.
*
- * @return String representation of revision or null, if revision is not
- * set.
+ * @param newModule New QNameModule to use
+ * @return a QName with specified QNameModule and same local name as this one
*/
- public String getFormattedRevision() {
- return module.getFormattedRevision();
+ public @NonNull QName withModule(final QNameModule newModule) {
+ return new QName(newModule, localName);
}
/**
- * Creates copy of this with revision and prefix unset.
+ * Returns a QName with the same namespace and local name, but with no revision. If this QName does not have
+ * a Revision, this object is returned.
*
- * @return copy of this QName with revision and prefix unset.
+ * @return a QName with the same namespace and local name, but with no revision.
*/
- public QName withoutRevision() {
- return QName.create(getNamespace(), null, localName);
- }
-
- public static Date parseRevision(final String formatedDate) {
- try {
- return getRevisionFormat().parse(formatedDate);
- } catch (ParseException | RuntimeException e) {
- throw new IllegalArgumentException(
- String.format("Revision '%s'is not in a supported format", formatedDate), e);
- }
+ public @NonNull QName withoutRevision() {
+ final QNameModule newModule;
+ return (newModule = module.withoutRevision()) == module ? this : new QName(newModule, localName);
}
/**
- * Formats {@link Date} representing revision to format
- * <code>YYYY-mm-dd</code>
+ * Formats {@link Revision} representing revision to format {@code YYYY-mm-dd}
*
- * YANG Specification defines format for <code>revision</code> as
- * YYYY-mm-dd. This format for revision is reused accross multiple places
- * such as capabilities URI, YANG modules, etc.
+ * <p>
+ * YANG Specification defines format for {@code revision<} as YYYY-mm-dd. This format for revision is reused across
+ * multiple places such as capabilities URI, YANG modules, etc.
*
- * @param revision
- * Date object to format or null
+ * @param revision Date object to format
* @return String representation or null if the input was null.
*/
- public static String formattedRevision(final Date revision) {
- if (revision == null) {
- return null;
- }
- return getRevisionFormat().format(revision);
+ public static @Nullable String formattedRevision(final Optional<Revision> revision) {
+ return revision.map(Revision::toString).orElse(null);
}
/**
- *
* Compares this QName to other, without comparing revision.
*
- * Compares instance of this to other instance of QName and returns true if
- * both instances have equal <code>localName</code> ({@link #getLocalName()}
- * ) and <code>namespace</code> ({@link #getNamespace()}).
+ * <p>
+ * Compares instance of this to other instance of QName and returns true if both instances have equal
+ * {@code localName} ({@link #getLocalName()}) and @{code namespace} ({@link #getNamespace()}).
*
- * @param other
- * Other QName. Must not be null.
- * @return true if this instance and other have equals localName and
- * namespace.
- * @throws NullPointerException
- * if <code>other</code> is null.
+ * @param other Other QName. Must not be null.
+ * @return true if this instance and other have equals localName and namespace.
+ * @throws NullPointerException if {@code other} is null.
*/
public boolean isEqualWithoutRevision(final QName other) {
return localName.equals(other.getLocalName()) && Objects.equals(getNamespace(), other.getNamespace());
}
+ // FIXME: this comparison function looks odd. We are sorting first by local name and then by module? What is
+ // the impact on iteration order of SortedMap<QName, ?>?
@Override
- public int compareTo(final QName other) {
+ @SuppressWarnings("checkstyle:parameterName")
+ public int compareTo(final QName o) {
// compare mandatory localName parameter
- int result = localName.compareTo(other.localName);
+ int result = localName.compareTo(o.localName);
if (result != 0) {
return result;
}
+ return module.compareTo(o.module);
+ }
- // compare nullable namespace parameter
- if (getNamespace() == null) {
- if (other.getNamespace() != null) {
- return -1;
- }
- } else {
- if (other.getNamespace() == null) {
- return 1;
- }
- result = getNamespace().compareTo(other.getNamespace());
- if (result != 0) {
- return result;
- }
- }
-
- // compare nullable revision parameter
- if (getRevision() == null) {
- if (other.getRevision() != null) {
- return -1;
- }
- } else {
- if (other.getRevision() == null) {
- return 1;
- }
- result = getRevision().compareTo(other.getRevision());
- if (result != 0) {
- return result;
- }
- }
-
- return result;
+ @Override
+ public void writeTo(final DataOutput out) throws IOException {
+ module.writeTo(out);
+ out.writeUTF(localName);
}
+ Object writeReplace() {
+ return new QNv1(this);
+ }
}
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