package org.opendaylight.yangtools.yang.common;
import static org.opendaylight.yangtools.yang.common.SimpleDateFormatUtil.getRevisionFormat;
-
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Interner;
+import com.google.common.collect.Interners;
import java.io.Serializable;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
-
import org.opendaylight.yangtools.concepts.Immutable;
/**
*
*/
public final class QName implements Immutable, Serializable, Comparable<QName> {
+ private static final Interner<QName> INTERNER = Interners.newWeakInterner();
private static final long serialVersionUID = 5398411242927766414L;
static final String QNAME_REVISION_DELIMITER = "?revision=";
+ "(.+)\\)(.+)$");
private static final Pattern QNAME_PATTERN_NO_REVISION = Pattern.compile("^\\((.+)\\)(.+)$");
private static final Pattern QNAME_PATTERN_NO_NAMESPACE_NO_REVISION = Pattern.compile("^(.+)$");
-
private static final char[] ILLEGAL_CHARACTERS = new char[] { '?', '(', ')', '&' };
// Mandatory
private final QNameModule module;
// Mandatory
private final String localName;
- // Nullable
- private final String prefix;
- private QName(final QNameModule module, final String prefix, final String localName) {
+ private QName(final QNameModule module, final String localName) {
this.localName = checkLocalName(localName);
- this.prefix = prefix;
this.module = module;
}
/**
- * QName Constructor.
+ * Look up specified QName in the global cache and return a shared reference.
*
- * @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
+ * @param qname QName instance
+ * @return Cached instance, according to {@link org.opendaylight.yangtools.objcache.ObjectCache} policy.
*
+ * @deprecated Use {@link #intern()} instead.
*/
- public QName(final URI namespace, final Date revision, final String prefix, final String localName) {
- this(QNameModule.create(namespace, revision), prefix, localName);
+ @Deprecated
+ public static QName cachedReference(final QName qname) {
+ return qname.intern();
}
/**
* YANG schema identifier
*/
public QName(final URI namespace, final String localName) {
- this(namespace, null, "", localName);
+ this(QNameModule.create(namespace, null), localName);
}
private static String checkLocalName(final String localName) {
throw new IllegalArgumentException("Parameter 'localName' must be a non-empty string.");
}
- for (char c : ILLEGAL_CHARACTERS) {
+ for (final char c : ILLEGAL_CHARACTERS) {
if (localName.indexOf(c) != -1) {
throw new IllegalArgumentException(String.format(
"Parameter 'localName':'%s' contains illegal character '%s'", localName, c));
return localName;
}
- /**
- * QName Constructor.
- *
- * @param namespace
- * the namespace assigned to the YANG module
- * @param revision
- * the revision of the YANG module
- * @param localName
- * YANG schema identifier
- *
- * @deprecated Use {@link #create(URI, Date, String)} instead.
- */
- @Deprecated
- public QName(final URI namespace, final Date revision, final String localName) {
- this(QNameModule.create(namespace, revision), null, localName);
- }
-
- /**
- * Construct new QName which reuses namespace, revision and prefix from
- * base.
- *
- * @param base
- * @param localName
- * @deprecated Use {@link #create(QName, String)} instead.
- */
- @Deprecated
- public QName(final QName base, final String localName) {
- this(base.getNamespace(), base.getRevision(), base.getPrefix(), localName);
- }
-
- /**
- * @deprecated Use {@link #create(String)} instead. This implementation is
- * broken.
- */
- @Deprecated
- public QName(final String input) throws ParseException {
- final String nsAndRev = input.substring(input.indexOf("(") + 1, input.indexOf(")"));
- final Date revision;
- final URI namespace;
- if (nsAndRev.contains("?")) {
- String[] splitted = nsAndRev.split("\\?");
- namespace = URI.create(splitted[0]);
- revision = getRevisionFormat().parse(splitted[1]);
- } else {
- namespace = URI.create(nsAndRev);
- revision = null;
- }
-
- this.localName = checkLocalName(input.substring(input.indexOf(")") + 1));
- this.prefix = null;
- this.module = QNameModule.create(namespace, revision);
- }
-
public static 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);
+ final String localName = matcher.group(1);
return new QName((URI) null, localName);
}
throw new IllegalArgumentException("Invalid input:" + input);
}
/**
- * 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 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 : QName.create(cacheMod, localName);
+
+ 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 + ((getNamespace() == null) ? 0 : getNamespace().hashCode());
- result = prime * result + ((getFormattedRevision() == null) ? 0 : getFormattedRevision().hashCode());
+ result = prime * result + Objects.hashCode(localName);
+ result = prime * result + module.hashCode();
return result;
}
* {@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
+ * @param obj the object to be compared for equality with this QName
* @return <tt>true</tt> if the specified object is equal to this QName
*
*/
return false;
}
final QName other = (QName) obj;
- if (localName == null) {
- if (other.localName != null) {
- return false;
- }
- } else if (!localName.equals(other.localName)) {
- return false;
- }
- if (getNamespace() == null) {
- if (other.getNamespace() != null) {
- return false;
- }
- } else if (!getNamespace().equals(other.getNamespace())) {
- return false;
- }
- if (getFormattedRevision() == null) {
- if (other.getFormattedRevision() != null) {
- return false;
- }
- } else if (!getRevision().equals(other.getRevision())) {
- return false;
- }
- return true;
+ return Objects.equals(localName, other.localName) && module.equals(other.module);
}
public static QName create(final QName base, final String localName) {
- return new QName(base, localName);
+ return create(base.getModule(), localName);
}
- 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(Preconditions.checkNotNull(qnameModule,"module may not be 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.
+ * @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 create(QNameModule.create(namespace, revision), localName);
}
/**
* Local name part of QName. MUST NOT BE null.
* @return
* @throws NullPointerException
- * If any of paramaters is null.
+ * If any of parameters 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;
+ public static QName create(final String namespace, final String revision, final String localName) {
+ final URI namespaceUri = parseNamespace(namespace);
+ final Date revisionDate = parseRevision(revision);
+ return create(namespaceUri, revisionDate, localName);
+ }
+
+ private static URI parseNamespace(final String namespace) {
try {
- namespaceUri = new URI(namespace);
- } catch (URISyntaxException ue) {
+ return new URI(namespace);
+ } catch (final URISyntaxException ue) {
throw new IllegalArgumentException(String.format("Namespace '%s' is not a valid URI", namespace), ue);
}
+ }
- Date revisionDate = parseRevision(revision);
- return create(namespaceUri, revisionDate, 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
+ * @throws NullPointerException
+ * If any of parameters is null.
+ * @throws IllegalArgumentException
+ * If <code>namespace</code> is not valid URI.
+ */
+ public static QName create(final String namespace, final String localName) {
+ return create(parseNamespace(namespace), null, localName);
}
@Override
public String toString() {
- StringBuilder sb = new StringBuilder();
+ 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());
+ sb.append(QNAME_REVISION_DELIMITER).append(getFormattedRevision());
}
sb.append(QNAME_RIGHT_PARENTHESIS);
}
* @return copy of this QName with revision and prefix unset.
*/
public QName withoutRevision() {
- return QName.create(getNamespace(), null, localName);
+ return create(getNamespace(), null, localName);
}
public static Date parseRevision(final String formatedDate) {
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