+ public static final class Key implements Immutable {
+ private final @NonNull String localName;
+ private final @NonNull String namespace;
+ private final @Nullable String revision;
+
+ public Key(final String localName, final String namespace, final String revision) {
+ this.localName = requireNonNull(localName);
+ this.namespace = requireNonNull(namespace);
+ this.revision = revision;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(localName, namespace, revision);
+ }
+
+ @Override
+ public boolean equals(final Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (!(obj instanceof Key)) {
+ return false;
+ }
+ final Key other = (Key) obj;
+ return localName.equals(other.localName) && namespace.equals(other.namespace)
+ && Objects.equals(revision, other.revision);
+ }
+
+ QName toQName() {
+ return revision != null ? QName.create(namespace, revision, localName) : QName.create(namespace, localName);
+ }
+ }
+