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// Copyright (C) 2020 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.gitdiff;
import com.google.auto.value.AutoValue;
import com.google.gerrit.entities.Patch.ChangeType;
import com.google.gerrit.proto.Protos;
import com.google.gerrit.server.cache.proto.Cache.ModifiedFileProto;
import com.google.gerrit.server.cache.serialize.CacheSerializer;
import com.google.protobuf.Descriptors.FieldDescriptor;
import java.util.Optional;
/**
* An entity representing a Modified file due to a diff between 2 git trees. This entity contains
* the change type and the old & new paths, but does not include any actual content diff of the
* file.
*/
@AutoValue
public abstract class ModifiedFile {
/**
* Returns the change type (i.e. add, delete, modify, rename, etc...) associated with this
* modified file.
*/
public abstract ChangeType changeType();
/**
* Returns the old name associated with this file. An empty optional is returned if {@link
* #changeType()} is equal to {@link ChangeType#ADDED}.
*/
public abstract Optional<String> oldPath();
/**
* Returns the new name associated with this file. An empty optional is returned if {@link
* #changeType()} is equal to {@link ChangeType#DELETED}
*/
public abstract Optional<String> newPath();
public static Builder builder() {
return new AutoValue_ModifiedFile.Builder();
}
public abstract Builder toBuilder();
/** Computes this object's weight, which is its size in bytes. */
public int weight() {
int weight = 1; // the changeType field
if (oldPath().isPresent()) {
weight += oldPath().get().length();
}
if (newPath().isPresent()) {
weight += newPath().get().length();
}
return weight;
}
@AutoValue.Builder
public abstract static class Builder {
public abstract Builder changeType(ChangeType value);
public abstract Builder oldPath(Optional<String> value);
public abstract Builder newPath(Optional<String> value);
public abstract ModifiedFile build();
}
enum Serializer implements CacheSerializer<ModifiedFile> {
INSTANCE;
private static final FieldDescriptor oldPathDescriptor =
ModifiedFileProto.getDescriptor().findFieldByNumber(2);
private static final FieldDescriptor newPathDescriptor =
ModifiedFileProto.getDescriptor().findFieldByNumber(3);
@Override
public byte[] serialize(ModifiedFile modifiedFile) {
return Protos.toByteArray(toProto(modifiedFile));
}
public ModifiedFileProto toProto(ModifiedFile modifiedFile) {
ModifiedFileProto.Builder builder = ModifiedFileProto.newBuilder();
builder.setChangeType(modifiedFile.changeType().toString());
if (modifiedFile.oldPath().isPresent()) {
builder.setOldPath(modifiedFile.oldPath().get());
}
if (modifiedFile.newPath().isPresent()) {
builder.setNewPath(modifiedFile.newPath().get());
}
return builder.build();
}
@Override
public ModifiedFile deserialize(byte[] in) {
ModifiedFileProto modifiedFileProto = Protos.parseUnchecked(ModifiedFileProto.parser(), in);
return fromProto(modifiedFileProto);
}
public ModifiedFile fromProto(ModifiedFileProto modifiedFileProto) {
ModifiedFile.Builder builder = ModifiedFile.builder();
builder.changeType(ChangeType.valueOf(modifiedFileProto.getChangeType()));
if (modifiedFileProto.hasField(oldPathDescriptor)) {
builder.oldPath(Optional.of(modifiedFileProto.getOldPath()));
}
if (modifiedFileProto.hasField(newPathDescriptor)) {
builder.newPath(Optional.of(modifiedFileProto.getNewPath()));
}
return builder.build();
}
}
}
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