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// Copyright (C) 2016 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.git;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.lib.AbbreviatedObjectId;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.PackParser;
public class InMemoryInserter extends ObjectInserter {
private final ObjectReader reader;
private final Map<ObjectId, InsertedObject> inserted = new LinkedHashMap<>();
private final boolean closeReader;
public InMemoryInserter(ObjectReader reader) {
this.reader = checkNotNull(reader);
closeReader = false;
}
public InMemoryInserter(Repository repo) {
this.reader = repo.newObjectReader();
closeReader = true;
}
@Override
public ObjectId insert(int type, long length, InputStream in) throws IOException {
return insert(InsertedObject.create(type, in));
}
@Override
public ObjectId insert(int type, byte[] data) {
return insert(type, data, 0, data.length);
}
@Override
public ObjectId insert(int type, byte[] data, int off, int len) {
return insert(InsertedObject.create(type, data, off, len));
}
public ObjectId insert(InsertedObject obj) {
inserted.put(obj.id(), obj);
return obj.id();
}
@Override
public PackParser newPackParser(InputStream in) {
throw new UnsupportedOperationException();
}
@Override
public ObjectReader newReader() {
return new Reader();
}
@Override
public void flush() {
// Do nothing; objects are not written to the repo.
}
@Override
public void close() {
if (closeReader) {
reader.close();
}
}
public ImmutableList<InsertedObject> getInsertedObjects() {
return ImmutableList.copyOf(inserted.values());
}
public int getInsertedObjectCount() {
return inserted.values().size();
}
public void clear() {
inserted.clear();
}
private class Reader extends ObjectReader {
@Override
public ObjectReader newReader() {
return new Reader();
}
@Override
public Collection<ObjectId> resolve(AbbreviatedObjectId id) throws IOException {
Set<ObjectId> result = new HashSet<>();
for (ObjectId insId : inserted.keySet()) {
if (id.prefixCompare(insId) == 0) {
result.add(insId);
}
}
result.addAll(reader.resolve(id));
return result;
}
@Override
public ObjectLoader open(AnyObjectId objectId, int typeHint) throws IOException {
InsertedObject obj = inserted.get(objectId);
if (obj == null) {
return reader.open(objectId, typeHint);
}
if (typeHint != OBJ_ANY && obj.type() != typeHint) {
throw new IncorrectObjectTypeException(objectId.copy(), typeHint);
}
return obj.newLoader();
}
@Override
public Set<ObjectId> getShallowCommits() throws IOException {
return reader.getShallowCommits();
}
@Override
public void close() {
// Do nothing; this class owns no open resources.
}
@Override
public ObjectInserter getCreatedFromInserter() {
return InMemoryInserter.this;
}
}
}
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