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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, Commit extends GraphCommit<CommitId>> {
@NotNull
public List<Commit> join(@NotNull Collection<List<Commit>> logsFromRepos) {
if (logsFromRepos.size() == 1) {
return logsFromRepos.iterator().next();
}
int size = 0;
for (List<Commit> repo : logsFromRepos) {
size += repo.size();
}
List<Commit> result = new ArrayList<Commit>(size);
Map<Commit, Iterator<Commit>> nextCommits = ContainerUtil.newHashMap();
for (List<Commit> log : logsFromRepos) {
Iterator<Commit> iterator = log.iterator();
if (iterator.hasNext()) {
nextCommits.put(iterator.next(), iterator);
}
}
while (!nextCommits.isEmpty()) {
Commit lastCommit = findLatestCommit(nextCommits.keySet());
Iterator<Commit> iterator = nextCommits.get(lastCommit);
result.add(lastCommit);
nextCommits.remove(lastCommit);
if (iterator.hasNext()) {
nextCommits.put(iterator.next(), iterator);
}
}
return result;
}
@NotNull
private Commit findLatestCommit(@NotNull Set<Commit> commits) {
long maxTimeStamp = Long.MIN_VALUE;
Commit lastCommit = null;
for (Commit commit : commits) {
if (commit.getTimestamp() >= maxTimeStamp) {
maxTimeStamp = commit.getTimestamp();
lastCommit = commit;
}
}
assert lastCommit != null;
return lastCommit;
}
}
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