/**
* If some or all of the children of this name are versions, returns the latest version among
* them.
*
* @return ContentName The latest version component
*/
public ContentName getLatestVersionChildName() {
// of the available names in _children that are version components,
// find the latest one (version-wise)
// names are sorted, so the last one that is a version should be the latest version
// ListIterator previous doesn't work unless you've somehow gotten it to point at the end...
ContentName theName = null;
ContentName latestName = null;
CCNTime latestTimestamp = null;
Iterator<ContentName> it = _children.iterator();
// TODO these are sorted -- we just need to iterate through them in reverse order. Having
// trouble finding something like C++'s reverse iterators to do that (linked list iterators
// can go backwards -- but you have to run them to the end first).
while (it.hasNext()) {
theName = it.next();
if (VersioningProfile.isVersionComponent(theName.component(0))) {
if (null == latestName) {
latestName = theName;
latestTimestamp = VersioningProfile.getVersionComponentAsTimestamp(theName.component(0));
} else {
CCNTime thisTimestamp =
VersioningProfile.getVersionComponentAsTimestamp(theName.component(0));
if (thisTimestamp.after(latestTimestamp)) {
latestName = theName;
latestTimestamp = thisTimestamp;
}
}
}
}
return latestName;
}
/**
* Returns the latest version available under this prefix as a CCNTime object.
*
* @return CCNTime Latest child version as CCNTime
*/
public CCNTime getLatestVersionChildTime() {
ContentName latestVersion = getLatestVersionChildName();
if (null != latestVersion) {
return VersioningProfile.getVersionComponentAsTimestamp(latestVersion.component(0));
}
return null;
}
/**
* Create a VersionNumber from a byte array, such as from a ContentName component.
*
* @param versionComponent
*/
public VersionNumber(byte[] versionComponent) {
_version = VersioningProfile.getVersionComponentAsTimestamp(versionComponent);
_versionComponent = copyOf(versionComponent, versionComponent.length);
_binaryTime = _version.toBinaryTimeAsLong();
}