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package com.intellij.vcs.log.data;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.vcs.log.graph.GraphCommit;
import org.jetbrains.annotations.NotNull;
import java.util.*;
public class VcsLogMultiRepoJoiner<CommitId> {
@NotNull
public List<? extends GraphCommit<CommitId>> join(@NotNull Collection<List<? extends GraphCommit<CommitId>>> logsFromRepos) {
if (logsFromRepos.size() == 1) {
return logsFromRepos.iterator().next();
}
int size = 0;
for (List<? extends GraphCommit<CommitId>> repo : logsFromRepos) {
size += repo.size();
}
List<GraphCommit<CommitId>> result = new ArrayList<GraphCommit<CommitId>>(size);
Map<GraphCommit<CommitId>, Iterator<? extends GraphCommit<CommitId>>> nextCommits = ContainerUtil.newHashMap();
for (List<? extends GraphCommit<CommitId>> log : logsFromRepos) {
Iterator<? extends GraphCommit<CommitId>> iterator = log.iterator();
if (iterator.hasNext()) {
nextCommits.put(iterator.next(), iterator);
}
}
while (!nextCommits.isEmpty()) {
GraphCommit<CommitId> lastCommit = findLatestCommit(nextCommits.keySet());
Iterator<? extends GraphCommit<CommitId>> iterator = nextCommits.get(lastCommit);
result.add(lastCommit);
nextCommits.remove(lastCommit);
if (iterator.hasNext()) {
nextCommits.put(iterator.next(), iterator);
}
}
return result;
}
@NotNull
private GraphCommit<CommitId> findLatestCommit(@NotNull Set<GraphCommit<CommitId>> commits) {
long maxTimeStamp = Long.MIN_VALUE;
GraphCommit<CommitId> lastCommit = null;
for (GraphCommit<CommitId> commit : commits) {
if (commit.getTimestamp() >= maxTimeStamp) {
maxTimeStamp = commit.getTimestamp();
lastCommit = commit;
}
}
assert lastCommit != null;
return lastCommit;
}
}
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