/*
* Copyright (C) 2011, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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package org.eclipse.jgit.internal.storage.pack;
import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
import static org.eclipse.jgit.lib.Constants.OBJ_TREE;
import java.io.IOException;
import java.util.List;
import java.util.Set;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.MutableObjectId;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectIdOwnerMap;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.ProgressMonitor;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
class BaseSearch {
private static final int M_BLOB = FileMode.REGULAR_FILE.getBits();
private static final int M_TREE = FileMode.TREE.getBits();
private final ProgressMonitor progress;
private final ObjectReader reader;
private final ObjectId[] baseTrees;
private final ObjectIdOwnerMap<ObjectToPack> objectsMap;
private final List<ObjectToPack> edgeObjects;
private final IntSet alreadyProcessed;
private final ObjectIdOwnerMap<TreeWithData> treeCache;
private final CanonicalTreeParser parser;
private final MutableObjectId idBuf;
BaseSearch(ProgressMonitor countingMonitor, Set<RevTree> bases,
ObjectIdOwnerMap<ObjectToPack> objects,
List<ObjectToPack> edges, ObjectReader or) {
progress = countingMonitor;
reader = or;
baseTrees = bases.toArray(new ObjectId[bases.size()]);
objectsMap = objects;
edgeObjects = edges;
alreadyProcessed = new IntSet();
treeCache = new ObjectIdOwnerMap<TreeWithData>();
parser = new CanonicalTreeParser();
idBuf = new MutableObjectId();
}
void addBase(int objectType, byte[] pathBuf, int pathLen, int pathHash)
throws IOException {
final int tailMode = modeForType(objectType);
if (tailMode == 0)
return;
if (!alreadyProcessed.add(pathHash))
return;
if (pathLen == 0) {
for (ObjectId root : baseTrees)
add(root, OBJ_TREE, pathHash);
return;
}
final int firstSlash = nextSlash(pathBuf, 0, pathLen);
CHECK_BASE: for (ObjectId root : baseTrees) {
int ptr = 0;
int end = firstSlash;
int mode = end != pathLen ? M_TREE : tailMode;
parser.reset(readTree(root));
while (!parser.eof()) {
int cmp = parser.pathCompare(pathBuf, ptr, end, mode);
if (cmp < 0) {
parser.next();
continue;
}
if (cmp > 0)
continue CHECK_BASE;
if (end == pathLen) {
if (parser.getEntryFileMode().getObjectType() == objectType) {
idBuf.fromRaw(parser.idBuffer(), parser.idOffset());
add(idBuf, objectType, pathHash);
}
continue CHECK_BASE;
}
if (!FileMode.TREE.equals(parser.getEntryRawMode()))
continue CHECK_BASE;
ptr = end + 1;
end = nextSlash(pathBuf, ptr, pathLen);
mode = end != pathLen ? M_TREE : tailMode;
idBuf.fromRaw(parser.idBuffer(), parser.idOffset());
parser.reset(readTree(idBuf));
}
}
}
private static int modeForType(int typeCode) {
switch (typeCode) {
case OBJ_TREE:
return M_TREE;
case OBJ_BLOB:
return M_BLOB;
default:
return 0;
}
}
private static int nextSlash(byte[] pathBuf, int ptr, int end) {
while (ptr < end && pathBuf[ptr] != '/')
ptr++;
return ptr;
}
private void add(AnyObjectId id, int objectType, int pathHash) {
ObjectToPack obj = new ObjectToPack(id, objectType);
obj.setEdge();
obj.setPathHash(pathHash);
if (objectsMap.addIfAbsent(obj) == obj) {
edgeObjects.add(obj);
progress.update(1);
}
}
private byte[] readTree(AnyObjectId id) throws MissingObjectException,
IncorrectObjectTypeException, IOException {
TreeWithData tree = treeCache.get(id);
if (tree != null)
return tree.buf;
ObjectLoader ldr = reader.open(id, OBJ_TREE);
byte[] buf = ldr.getCachedBytes(Integer.MAX_VALUE);
treeCache.add(new TreeWithData(id, buf));
return buf;
}
private static class TreeWithData extends ObjectIdOwnerMap.Entry {
final byte[] buf;
TreeWithData(AnyObjectId id, byte[] buf) {
super(id);
this.buf = buf;
}
}
}