| // Copyright (C) 2009 The Android Open Source Project |
| // |
| // 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.google.gerrit.server.patch; |
| |
| import org.spearce.jgit.diff.Edit; |
| import org.spearce.jgit.errors.IncorrectObjectTypeException; |
| import org.spearce.jgit.errors.MissingObjectException; |
| import org.spearce.jgit.lib.AbbreviatedObjectId; |
| import org.spearce.jgit.lib.ObjectId; |
| import org.spearce.jgit.lib.ObjectIdSerialization; |
| import org.spearce.jgit.lib.Repository; |
| import org.spearce.jgit.patch.CombinedFileHeader; |
| import org.spearce.jgit.patch.FileHeader; |
| import org.spearce.jgit.patch.Patch; |
| import org.spearce.jgit.revwalk.RevTree; |
| import org.spearce.jgit.revwalk.RevWalk; |
| import org.spearce.jgit.treewalk.TreeWalk; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| public final class DiffCacheContent implements Serializable { |
| private static final long serialVersionUID = 2L; |
| |
| public static DiffCacheContent create(final Repository db, |
| final DiffCacheKey key, final FileHeader file) |
| throws MissingObjectException, IncorrectObjectTypeException, IOException { |
| final ObjectId o; |
| final ObjectId n; |
| |
| if (file.getOldId() != null && file.getOldId().isComplete()) { |
| o = toId(file.getOldId()); |
| } else { |
| String path = key.getSourceFileName(); |
| if (path == null) { |
| path = key.getFileName(); |
| } |
| o = find(db, key.getOldId(), path); |
| } |
| |
| if (file.getNewId() != null && file.getNewId().isComplete()) { |
| n = toId(file.getNewId()); |
| } else { |
| n = find(db, key.getNewId(), key.getFileName()); |
| } |
| |
| return new DiffCacheContent(file, o, n); |
| } |
| |
| private static ObjectId toId(final AbbreviatedObjectId a) { |
| final ObjectId o = a.toObjectId(); |
| return ObjectId.zeroId().equals(o) ? null : o; |
| } |
| |
| static ObjectId find(final Repository db, final ObjectId treeIsh, |
| final String path) throws MissingObjectException, |
| IncorrectObjectTypeException, IOException { |
| final RevTree tree = new RevWalk(db).parseTree(treeIsh); |
| final TreeWalk tw = TreeWalk.forPath(db, path, tree); |
| if (tw == null) { |
| return null; |
| } |
| return tw.getObjectId(0); |
| } |
| |
| private transient boolean noDifference; |
| private transient ObjectId oldId; |
| private transient ObjectId newId; |
| private transient FileHeader header; |
| private transient List<Edit> edits; |
| |
| public DiffCacheContent() { |
| noDifference = true; |
| } |
| |
| private DiffCacheContent(final FileHeader h, final ObjectId o, |
| final ObjectId n) { |
| noDifference = false; |
| header = compact(h); |
| oldId = o; |
| newId = n; |
| |
| if (h instanceof CombinedFileHeader || h.getHunks().isEmpty()) { |
| edits = Collections.emptyList(); |
| } else { |
| edits = h.toEditList(); |
| } |
| } |
| |
| public boolean isNoDifference() { |
| return noDifference; |
| } |
| |
| public ObjectId getOldId() { |
| return oldId; |
| } |
| |
| public ObjectId getNewId() { |
| return newId; |
| } |
| |
| public FileHeader getFileHeader() { |
| return header; |
| } |
| |
| public List<Edit> getEdits() { |
| return edits; |
| } |
| |
| private void writeObject(final ObjectOutputStream out) throws IOException { |
| out.writeBoolean(noDifference); |
| if (noDifference) { |
| return; |
| } |
| |
| ObjectIdSerialization.write(out, oldId); |
| ObjectIdSerialization.write(out, newId); |
| |
| final int len = end(header) - header.getStartOffset(); |
| out.writeInt(len); |
| out.write(header.getBuffer(), header.getStartOffset(), len); |
| |
| out.writeInt(edits.size()); |
| for (final Edit e : edits) { |
| out.writeInt(e.getBeginA()); |
| out.writeInt(e.getEndA()); |
| out.writeInt(e.getBeginB()); |
| out.writeInt(e.getEndB()); |
| } |
| } |
| |
| private void readObject(final ObjectInputStream in) throws IOException { |
| noDifference = in.readBoolean(); |
| if (noDifference) { |
| return; |
| } |
| |
| oldId = ObjectIdSerialization.read(in); |
| newId = ObjectIdSerialization.read(in); |
| |
| final byte[] buf = new byte[in.readInt()]; |
| in.readFully(buf); |
| header = parse(buf); |
| |
| final int editCount = in.readInt(); |
| edits = new ArrayList<Edit>(editCount); |
| for (int n = editCount - 1; 0 <= n; n--) { |
| final int beginA = in.readInt(); |
| final int endA = in.readInt(); |
| final int beginB = in.readInt(); |
| final int endB = in.readInt(); |
| edits.add(new Edit(beginA, endA, beginB, endB)); |
| } |
| } |
| |
| private static FileHeader parse(final byte[] buf) { |
| final Patch p = new Patch(); |
| p.parse(buf, 0, buf.length); |
| return p.getFiles().get(0); |
| } |
| |
| private static FileHeader compact(final FileHeader h) { |
| final int end = end(h); |
| if (h.getStartOffset() == 0 && end == h.getBuffer().length) { |
| return h; |
| } |
| |
| final byte[] buf = new byte[end - h.getStartOffset()]; |
| System.arraycopy(h.getBuffer(), h.getStartOffset(), buf, 0, buf.length); |
| return parse(buf); |
| } |
| |
| private static int end(final FileHeader h) { |
| if (h instanceof CombinedFileHeader) { |
| return h.getEndOffset(); |
| } |
| if (!h.getHunks().isEmpty()) { |
| return h.getHunks().get(0).getStartOffset(); |
| } |
| return h.getEndOffset(); |
| } |
| } |