| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.intellij.vcs.log.graph.impl.permanent; |
| |
| import com.intellij.util.SmartList; |
| import com.intellij.vcs.log.graph.GraphCommit; |
| import com.intellij.vcs.log.graph.api.LinearGraph; |
| import com.intellij.vcs.log.graph.utils.Flags; |
| import com.intellij.vcs.log.graph.utils.impl.BitSetFlags; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import static com.intellij.vcs.log.graph.impl.permanent.DuplicateParentFixer.fixDuplicateParentCommits; |
| |
| public class PermanentLinearGraphBuilder<CommitId> { |
| |
| @NotNull |
| public static <CommitId> PermanentLinearGraphBuilder<CommitId> newInstance(@NotNull List<? extends GraphCommit<CommitId>> graphCommits) { |
| graphCommits = fixDuplicateParentCommits(graphCommits); |
| Flags simpleNodes = new BitSetFlags(graphCommits.size()); |
| |
| int longEdgesCount = 0; |
| |
| for (int nodeIndex = 0; nodeIndex < graphCommits.size(); nodeIndex++) { |
| GraphCommit<CommitId> commit = graphCommits.get(nodeIndex); |
| |
| CommitId nextCommitHashIndex = nextCommitHashIndex(graphCommits, nodeIndex); |
| |
| List parents = commit.getParents(); |
| if (parents.size() == 1 && parents.get(0).equals(nextCommitHashIndex)) { |
| simpleNodes.set(nodeIndex, true); |
| } else { |
| longEdgesCount += parents.size(); |
| } |
| } |
| |
| return new PermanentLinearGraphBuilder<CommitId>(graphCommits, simpleNodes, longEdgesCount); |
| } |
| |
| @Nullable |
| private static <CommitId> CommitId nextCommitHashIndex(List<? extends GraphCommit<CommitId>> commits, int nodeIndex) { |
| if (nodeIndex < commits.size() - 1) |
| return commits.get(nodeIndex + 1).getId(); |
| return null; |
| } |
| |
| private final List<? extends GraphCommit<CommitId>> myCommits; |
| private final Flags mySimpleNodes; |
| |
| private final int myNodesCount; |
| |
| private final int[] myNodeToEdgeIndex; |
| private final int[] myLongEdges; |
| |
| // downCommitId -> List of upNodeIndex |
| private final Map<CommitId, List<Integer>> upAdjacentNodes = new HashMap<CommitId, List<Integer>>(); |
| |
| // commitHash -> GraphCommit |
| private final Map<CommitId, GraphCommit<CommitId>> commitsWithNotLoadParent = new HashMap<CommitId, GraphCommit<CommitId>>(); |
| |
| private PermanentLinearGraphBuilder(List<? extends GraphCommit<CommitId>> commits, Flags simpleNodes, int longEdgesCount) { |
| myCommits = commits; |
| mySimpleNodes = simpleNodes; |
| |
| myNodesCount = simpleNodes.size(); |
| |
| myNodeToEdgeIndex = new int[myNodesCount + 1]; |
| myLongEdges = new int[2 * longEdgesCount]; |
| } |
| |
| private void addUnderdoneEdge(int upNodeIndex, CommitId downCommitId) { |
| List<Integer> upNodes = upAdjacentNodes.get(downCommitId); |
| if (upNodes == null) { |
| upNodes = new SmartList<Integer>(); |
| upAdjacentNodes.put(downCommitId, upNodes); |
| } |
| upNodes.add(upNodeIndex); |
| } |
| |
| private void addCommitWithNotLoadParent(int nodeIndex) { |
| GraphCommit<CommitId> commit = myCommits.get(nodeIndex); |
| commitsWithNotLoadParent.put(commit.getId(), commit); |
| } |
| |
| private void fixUnderdoneEdgeForNotLoadCommit(int upNodeIndex) { |
| for (int edgeIndex = myNodeToEdgeIndex[upNodeIndex]; edgeIndex < myNodeToEdgeIndex[upNodeIndex + 1]; edgeIndex++) { |
| if (myLongEdges[edgeIndex] == -1) { |
| addCommitWithNotLoadParent(upNodeIndex); |
| myLongEdges[edgeIndex] = LinearGraph.NOT_LOAD_COMMIT; |
| return; |
| } |
| } |
| throw new IllegalStateException("Not found underdone edge to not load commit for node: " + upNodeIndex); |
| } |
| |
| private void fixUnderdoneEdge(int upNodeIndex, int downNodeIndex, CommitId downCommitId) { |
| int end = myNodeToEdgeIndex[upNodeIndex + 1]; |
| |
| GraphCommit<CommitId> upCommit = myCommits.get(upNodeIndex); |
| List<CommitId> parentHashIndices = upCommit.getParents(); |
| |
| for (int i = 0; i < parentHashIndices.size(); i++) { |
| if (parentHashIndices.get(i).equals(downCommitId)) { |
| int offset = parentHashIndices.size() - i; |
| int edgeIndex = end - offset; |
| |
| if (myLongEdges[edgeIndex] == -1) { |
| myLongEdges[edgeIndex] = downNodeIndex; |
| return; |
| } else { |
| throw new IllegalStateException("Edge was set early!. Up node: " + upNodeIndex + ", down node: " + downNodeIndex); |
| } |
| } |
| } |
| throw new IllegalStateException("Not found underdone edges for node: " + upNodeIndex + ". Adjacent down node: " + downNodeIndex); |
| } |
| |
| private void doStep(int nodeIndex) { |
| GraphCommit<CommitId> commit = myCommits.get(nodeIndex); |
| |
| List<Integer> upNodes = upAdjacentNodes.remove(commit.getId()); |
| if (upNodes == null) |
| upNodes = Collections.emptyList(); |
| |
| int edgeIndex = myNodeToEdgeIndex[nodeIndex]; |
| for (Integer upNodeIndex : upNodes) { |
| fixUnderdoneEdge(upNodeIndex, nodeIndex, commit.getId()); |
| myLongEdges[edgeIndex] = upNodeIndex; |
| edgeIndex++; |
| } |
| |
| // down nodes |
| if (!mySimpleNodes.get(nodeIndex)) { |
| for (CommitId downCommitId : commit.getParents()) { |
| addUnderdoneEdge(nodeIndex, downCommitId); |
| myLongEdges[edgeIndex] = -1; |
| edgeIndex++; |
| } |
| } |
| |
| myNodeToEdgeIndex[nodeIndex + 1] = edgeIndex; |
| } |
| |
| private void fixUnderdoneEdges() { |
| for (List<Integer> upNodes : upAdjacentNodes.values()) { |
| for (Integer upNodeIndex : upNodes) |
| fixUnderdoneEdgeForNotLoadCommit(upNodeIndex); |
| } |
| } |
| |
| public PermanentLinearGraphImpl build() { |
| for (int nodeIndex = 0; nodeIndex < myNodesCount; nodeIndex++) { |
| doStep(nodeIndex); |
| } |
| |
| fixUnderdoneEdges(); |
| |
| return new PermanentLinearGraphImpl(mySimpleNodes, myNodeToEdgeIndex, myLongEdges); |
| } |
| |
| public Map<CommitId, GraphCommit<CommitId>> getCommitsWithNotLoadParent() { |
| return commitsWithNotLoadParent; |
| } |
| } |