@Override
public Version getLatestVersion(VersionHistory versionHistory) {
List<Version> versions = versionHistory.getVersions();
if (CollectionUtils.isEmpty(versions)) {
return null;
}
return versions.iterator().next();
}
@Override
public Version getFirstVersion(VersionHistory versionHistory) {
List<Version> versions = versionHistory.getVersions();
if (CollectionUtils.isEmpty(versions)) {
return null;
}
return versions.get(versions.size() - 1);
}
// LIST order: descending
@Override
public Version getNext(VersionHistory versionHistory, Version version) {
List<Version> versions = versionHistory.getVersions();
int index = versions.indexOf(version);
if (index == 0) {
return null;
}
return versions.get(index - 1);
}
// LIST order: descending
@Override
public Version getPrevious(VersionHistory versionHistory, Version version) {
List<Version> versions = versionHistory.getVersions();
int index = versions.indexOf(version);
if ((index + 1) == versions.size()) return null;
return versions.get(index + 1);
}
@Override
public boolean isLastVersion(VersionHistory versionHistory, Version version) {
List<Version> versions = versionHistory.getVersions();
if (CollectionUtils.isEmpty(versions)) {
return false;
}
Version last = versions.iterator().next();
return last.equals(version);
}
@Override
public Version getVersion(VersionHistory versionHistory, Item item) {
List<Version> versions = versionHistory.getVersions();
for (Version v : versions) {
if (v.getItem().getID() == item.getID()) {
return v;
}
}
return null;
}
@Override
public boolean isFirstVersion(VersionHistory versionHistory, Version version) {
List<Version> versions = versionHistory.getVersions();
Version first = versions.get(versions.size() - 1);
return first.equals(version);
}